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Olivoni, Enea. "Studio di fattibilità di braccio robotico R-P." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14402/.
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Con questo elaborato si è eseguito lo studio di fattibilità di un banco didattico per il Corso di Laurea magistrale in Ingegneria meccanica - indirizzo Meccanica per l’automazione. Le specifiche per la progettazione del banco sono state dettate dall’esigenza di realizzare un meccanismo a più gradi di libertà controllato tramite opportuna scheda elettronica con l’obiettivo di avere un modello sperimentale sul quale approfondire alcuni aspetti di modellazione cinematica e dinamica, nonchè testare differenti strategie di controllo. Si è quindi pensato ad un braccio robotico a due gradi di libertà mobile in un piano verticale, controllato attraverso l’attuazione di una coppia rotoidale e di una prismatica, per la manipolazione di oggetti afferrati per mezzo di una ventosa ad attuazione pneumatica. Definita in prima istanza l’architettura di massima del sistema, grazie a opportuni calcoli di dimensionamento sono stati effettuati la scelta dei componenti commerciali ed il progetto delle parti da costruire. Si è quindi proposto un modello CAD in ambiente SolidWorks che ha permesso, fra l’altro, di definire le proprietà inerziali dei membri mobili. Queste ultime sono state sfruttate per eseguire simulazioni cinetostatiche con il software multibody Adams. Grazie ai risultati così ottenuti, è stato possibile eseguire il dimensionamento degli attuatori (motori brushless e relative trasmissioni) e la conseguente scelta a catalogo. Una volta selezionati gli azionamenti e gli altri componenti commerciali, si sono definiti i disegni costruttivi dei componenti da realizzare ad hoc ed è stata avviata la fase di approvvigionamento del materiale. Un possibile sviluppo del banco prova prevede l’introduzione di un’ulteriore coppia rotoidale attuata (da interporre con asse verticale fra il telaio e l’attuale primo membro), per ottenere un manipolatore dotato di moto spaziale.
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Sintoni, Leonardo. "Realizzazione di un braccio meccanico passivo per la calibrazione di sensori inerziali." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
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In questo elaborato di tesi viene descritto il progetto svolto all’interno di Turinsense EU Lab, fondata nel 2015 come sede di ricerca e sviluppo della start up californiana Turingsense Inc. Il settore di competenza dell'azienda è quello riguardante le tecnologie indossabili. Nello specifico, sfruttando un dispositivo con più sensori inerziali MEMS comunicanti tra loro con una rete wireless, Turingsense offre servizi per la creazione di sistemi integrati per il monitoraggio del movimento umano.
L'obiettivo della tesi è quello di realizzare uno strumento di validazione del modello biomeccanico sviluppato da Turingsense per l'elaborazione dei dati acquisiti dai sensori. E' stato richiesto un dispositivo in grado di simulare i movimenti dell'arto superiore, che non debba necessariamente riprodurre in maniera fedele la struttura anatomica delle articolazioni, ma che permetta semplicemente a ciascuno dei segmenti di interesse (busto, braccio, avambraccio e polso) di assumere le posizioni e gli orientamenti di quelli umani. A tal fine è stato progettato e realizzato un prototipo di manipolatore interamente in plastica. Il prototipo realizzato è ora disponibile presso il laboratorio dell'azienda, che ha avviato la sperimentazione.
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Rizqallah, Giada Jasmine. "Cinematica articolare del braccio destro durante l'esecuzione di una scala al violino." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
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Background e obiettivo: suonare uno strumento come il violino richiede competenze motorie elevate e molte ore di studio in posizioni scomode che possono portare, se ripetute sistematicamente e in maniera scorretta, all’insorgere di patologie e disordini muscolo-scheletrici. L’obiettivo di questo studio risulta essere l’identificazione delle differenze che si vengono a sviluppare tra musicista esperto e non; ci si concentra sulla parte dedicata al braccio destro e sulla tecnica d’arco con un ritmo imposto.
Metodi: il protocollo proposto sfrutta l’analisi cinematica ottenuta mediante stereofotogrammetria durante l’esecuzione di una scala al violino secondo due task differenti: prima a note sciolte e poi legate a coppie. Vengono misurati gli angoli di spalla, gomito, polso e archetto.
Risultati: gli inesperti si avvicinano all’esecuzione degli esperti con valori simili negli andamenti di FE di spalla e gomito, mentre la variabilità del polso rimane tendenzialmente più bassa e compensata dalle aperture maggiori di AA e IE di spalla. I soggetti mantengono l’arco tendenzialmente in asse come quello degli esperti e hanno basse fluttuazioni sul ritmo.
Conclusioni: misurazioni quantitative oltre che qualitative permettono un’analisi più approfondita sulla performance del musicista. Questo potrebbe rivelarsi utile sia in fase di studio per monitorare i progressi dello studente sia per sviluppi futuri sulla diagnosi di patologie legate ad un utilizzo scorretto e protratto nel tempo dello strumento.
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Ridolfi, Andrea. "Studio e implementazione di tecniche di Hand Eye Calibration di un Braccio Robotico." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10288/.
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La tesi indaga il problema di calibrazione Hand Eye, ovvero la trasformazione geometrica fra i diversi sistemi di riferimento della camera e dell'attuatore del robot, presentando il problema ed analizzando le varie soluzioni proposte in letteratura.
Viene infine presentata una implementazione realizzata in collaborazione con l'azienda SpecialVideo, implementata utilizzando l'algoritmo proposto da Konstantinos Daniilidis, il quale propone una formulazione del problema sfruttando l'utilizzo di quaternioni duali, risolvendo simultaneamente la parte rotatoria e traslatoria della trasformazione.
Si conclude il lavoro con una analisi dell'efficacia del metodo implementato su dati simulati e proponendo eventuali estensioni, allo scopo di poter riutilizzare in futuro il lavoro svolto nel software aziendale, con dati reali e con diversi tipi di telecamere, principalmente camere lineari o laser.
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Ferrari, Rubens. "Studio di fattibilità di un gomito protesico attivo a struttura mono-assiale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20255/.
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In questo elaborato si descrive l’attività di design di un’articolazione di gomito ad
azionamento mioelettrico, progetto nato da una collaborazione con IIT. L’obiettivo è stato
quello di creare un meccanismo in cui tutti le parti d’assieme fossero disposte lungo l’asse di
rotazione così da ridurre gli ingombri e il peso rispetto alle altre soluzioni attualmente
disponibili, fattori che aumentano il bacino dei pazienti potenzialmente trattabili. L’attività si
è concentrata sull’ideazione di un prototipo funzionale completo di tutti i componenti per
valutare le criticità e i punti di forza del sistema e aprire la strada a un futuro lavoro di
ottimizzazione.
Nel primo capitolo si introduce il concetto di protesica dell’arto superiore, descrivendo prima
l’anatomia e la biomeccanica dell’arto sano per poi focalizzarsi sulla classificazione delle
protesi, e in particolare di quelle mioelettriche.
Nel secondo capitolo vengono spiegati i metodi utilizzati in fase di progettazione
dell’articolazione protesica di gomito, si analizzano i razionali dello studio di fattibilità
iniziale, vengono definite le specifiche tecniche da ottenere e si descrivono le parti progettate
per completare l’assieme del meccanismo.
Nel terzo capitolo vengono illustrati i risultati della progettazione tramite un’analisi del
funzionamento del gomito assemblato.
Nel quarto capitolo trovano spazio le conclusioni e i possibili sviluppi futuri.
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Chierchia, Davide. "Analisi delle attuali problematiche rilevate sulla movimentazione di un braccio meccanico e progettazione delle relative possibili migliorie." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
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Studio delle attuali problematiche rilevate sulla movimentazione di un braccio meccanico,ottenuto tramite modello dinamico (validato), estrazione valori di forze e successivamente analisi FEM. Ipotizzata la sostituzione del riduttore utilizzato nella motorizzazione attuale con uno di serie differente. Disegnate due configurazioni di montaggio utilizzando il nuovo riduttore. Scelta della configurazione di montaggio ottimale fra quelle proposte.
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Canova, Marco <1983>. "Studio anatomico dei muscoli della spalla e del braccio in Pernis apivorus, Accipiter gentilis ed Accipiter nisus." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6876/.
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Recentemente, vari ricercatori si sono concentrati sulle proprietà funzionali dei muscoli, sulla meccanica e sulla cinematica legata al volo, ma senza la possibilità di consultare un’adeguata letteratura poiché assente o incompleta. Si è quindi ritenuto utile studiare la miologia della regione della spalla e del braccio di specie non in precedenza esaminate e che mostrassero differenti stili di volo, al fine di creare una base di informazioni per futuri studi funzionali.
Tutte le specie prese in esame sono membri della famiglia degli Accipitridae e nello specifico si sono selezionati: il Falco pecchiaiolo (Pernis apivorus Linnaeus, 1758), l’Astore comune (Accipiter gentilis Linnaeus, 1758) e lo Sparviero eurasiatico (Accipiter nisus Linnaeus, 1758). Questi animali attuano stili di volo differenti e sono stati pertanto scelti per capire se diverse performance di volo potessero indurre una differenziazione dell’apparato muscolare.
La comparazione dei dati raccolti durante questo studio con quelli presenti in letteratura in altre specie aviarie ha evidenziato che, mentre alcuni muscoli non sembrano andare incontro a grandi modificazioni nei rapaci, altri invece presentano una grande eterogeneità. In particolare, grazie alle caratteristiche dei diversi muscoli, si è potuto raggruppare questi ultimi in base a possibili funzioni comuni: a) muscoli che concorrono a stabilizzare l’ala rispetto al tronco e che assorbono le forze generate durante il volo; b) muscoli con possibile ruolo nel controllo della rotazione dell’omero; c) muscoli con possibile funzione propriocettiva.
Il presente studio ha inoltre evidenziato, nei muscoli esaminati, alcune similitudini e molteplici peculiarità anatomiche non precedentemente segnalate in letteratura.
Si ritiene che questo studio macroscopico possa rappresentare un punto di partenza per futuri studi microscopici o elettrofisiologici, a dimostrazione dell’importanza della dissezione quale primo strumento di indagine.Many researchers have recently focused on the functional properties of muscles, and on the mechanics and kinematics of flight, without being able to consult an anatomical database since such a database was either non-existent or incomplete. In particular, this study examined the anatomy of the wing muscles of three Accipitridae, such as the European honey buzzard (Pernis apivorus Linnaeus, 1758), the northern goshawk (Accipiter gentilis Linnaeus, 1758) and the eurasian sparrowhawk (Accipiter nisus Linnaeus, 1758). These birds of prey were selected due to their different flight style in order to understand if such different flight performance could induce muscles differentiation. The comparison of the results of this study with other researches shows that some muscles exhibit a lesser degree of differentiation as compared to other previously examined birds of prey. However, in other muscles, many peculiarities were found. Based on the common characteristics of these muscles have been grouped into three sets with possible common function: a) muscles stabilizing the wing to the trunk and damping the forces generated during the flight; b) muscles that could control the rotation of the humerus; c) muscles maybe involved in proprioception. During this research, some similarities with other species but also many anatomical features not previously reported have been found. This study of gross anatomy could be an interesting starting point for future researches, such as microscopic or electrophysiological analysis, demonstrating the importance of gross anatomy as a means of preliminary examination.
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Salvatore, Gianluca. "Ottimizzazione della cinematica inversa di una gru a braccio robotico ridondante per la progettazione di un attuatore lineare." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
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L'elaborato presenta uno studio di ottimizzazione della cinematica inversa di una gru a braccio robotico ridondante operante nelle piattaforme inshore per l'estrazione del petrolio. La sua funzione è quella di automatizzare le movimentazioni dei drill pipe all'interno dell'impianto di perforazione.
Sulla base di una movimentazione richiesta, si è partiti dalla definizione della traiettoria dell'organo terminale del manipolatore, mediante l'implementazione di andamenti composti da traiettorie spline e trapezoidali.
Successivamente, si è completata la chiusura della catena cinematica utilizzando due algoritmi differenti di minimizzazione rispetto al quadrato degli sforzi elaborati dagli attuatori. Il primo algoritmo è puramente numerico e la sua implementazione è necessaria per determinare la veridicità del secondo che invece è analitico.
Stabilita la correttezza dei due metodi di ottimizzazione, sulla base dei risultati ottenuti, è stato progettato uno degli attuatori lineari necessari per la movimentazione del manipolatore.
Le caratteristiche dovevano essere tali da portare a termine le movimentazioni richieste per un dato numero di cicli.
La progettazione è partita dalla definizione dei requisiti dei componenti principali, quali il motore elettrico, la trasmissione meccanica e la vite a ricircolo di sfere, passando per il loro dimensionamento, fino alla verifica. Infine, si è realizzata la modellazione 3D mediante il Software Creo Parametric.
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Ravagli, Eugenio. "Progettazione di un gruppo telescopico a due sfili per piattaforma di lavoro elevabile." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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Una piattaforma di lavoro mobile elevabile è una macchina che permette il sollevamento e lo stazionamento in quota di uno o più operatori. In questa tesi vengono esposte tutte le fasi necessarie al ridimensionamento di un gruppo telescopico di una PLE per la realizzazione di un nuovo modello: i bracci vengono schematizzati con dei modelli trave di cui si effettuano verifiche statiche, a fatica e a imbozzamento per ogni configurazione di carico di progetto. Di conseguenza, si riportano le sollecitazioni massime per controllare la resistenza di perni, catene e martinetti. Infine, il gruppo telescopico è verificato ulteriormente attraverso un'analisi agli elementi finiti.
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Clauss, Greg. "Ficino's Musica Humana musico-astrological improvisation /." Connect to this title, 2008. http://scholarworks.umass.edu/theses/109/.
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Bugini, Mariaelena. "Il significato della musica nell'opera intagliata ed intarsiata di fra' Giovanni da Verona." Tours, 2007. http://www.theses.fr/2007TOUR2008.
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La thèse comprend trois parties et un appendice. La première partie vise à dégager et à analyser les caractéristiques des instruments de musique et des partitions marquetés et sculptés par fra’ Giovanni da Verona, moine olivétain de Vérone, très doué pour le travail du bois, qui – entre la fin du XVe et le début du XVIe siècle – a été l’auteur des plus beaux choeurs monastiques de la péninsule italienne. La deuxième partie porte sur la lira da braccio du Kunsthistorisches Museum de Vienne signée par un certain “Joanes Andreas Veronensis” qu’en 1967 Emanuel Winternitz identifie avec le marqueteur olivétain Giovanni da Verona: il s’agit d’une erreur qui amène le chercheur d’aujourd’hui à s’interroger sur certains aspects négligés des rapports entre arts plastiques et musique à la Renaissance. La troisième partie est consacrée aux variations apportées par Vincenzo Dalle Vacche au style du maître fra’ Giovanni. L’appendice réunit textes et glossaires utiles aux trois parties de la thèseThe thesis is divided into three parts and one appendix. The first part is focussed on musical iconography in Giovanni da Verona’s inlays and carvings, masterpieces of the Renaissance monastic woodwork realised all over Italy between the XVth and the XVIth century. The second one analyses the apocryphal lira da braccio of the Vienna Kunsthistorisches Museum, wrongly assigned to fra’ Giovanni by Emanuel Winternitz in 1967. The third part illustrates the changements in style and meanings brought to the master’s art by his pupil fra’ Vincenzo Dalle Vacche. The appendix complete the work collecting texts and glossaries which can be useful to the comprehension of its three parts
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Selva, Lorenzo. "RELEASING COMPLEX TECTONICS . Robotic-fabricated adaptive formwork for non-standard architectural objects." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13961/.
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Candidato: Lorenzo Selva
Titolo Tesi: “Releasing Complex Tectonics: robotic-fabricated adaptive wireframe formwork for non-standard architectural objects"
La ricerca in questione si focalizza sullo studio di oggetti architettonici con geometria non-standard ed il parallelo sviluppo di un processo di fabbricazione digitale, in grado di snellirne e facilitarne la produzione. Lo stesso, come si può immaginare, sarà utilizzabile anche per oggetti con geometrie di minore complessità, uniformando in questo modo la logica costruttiva. Nello specifico, l’obiettivo è di esplorare le implicazioni architettoniche e le potenzialità formali che si generano dal rapporto tool - materiale. I processi oggi utilizzati, infatti, mostrano alcuni aspetti controversi che ne limitano efficienza ed applicabilità. Su tutti, operazioni di casseratura ed armatura altamente time e material-consuming ed il fatto che gli oggetti, sostanzialmente, vengono costruiti due volte: la prima durante fabbricazione e posa del cassero; la seconda durante il getto e la presa del materiale di filling. La conseguenza è una concreta anti-economicità su più fronti, che conduce talvolta alla ripetizione e alla semplificazione progettuale delle forme. Un approccio alternativo passa inevitabilmente dal superamento di questa logica, indagando la possibilità di fondere queste due operazioni. Releasing Complex Tectonics nasce appunto con l’idea di estrudere roboticamente mesh tridimensionali, denominate leaking fomworks, con integrata la duplice funzione di cassero e rinforzo. Un processo additivo che minimizza lo spreco di materiale, governato digitalmente e con elevato controllo spaziale e geometrico dell’oggetto prodotto, applicabile indistintamente in-situ e in laboratorio, in grado di svincolare la morfologia del prodotto finale dal tempo e dalla complessità delle operazioni necessarie alla sua realizzazione.
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Valerii, Adele. "Ricostruzione di convessi e robotica." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10956/.
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Questa tesi si è focalizzata sulla topologia robotica. In particolare, in questo elaborato si è voluto sottolineare l’importanza della topografia dei pezzi nella visione robotica. Siamo partiti dalle definizioni di politopo e di mappa gaussiana estesa, per poi passare ad alcuni punti chiave della robotica, quali la definizione di posa di un oggetto, di “peg in the hole”e di forma da X. Questi punti ci hanno permesso di enunciare i teoremi di Minkowski ed Alexandrov che sono stati poi utilizzati nella costruzione del metodo EGI. Questo metodo è stato quindi utilizzato per determinare l’assetto di un oggetto nello spazio e permettere quindi al braccio del robot di afferrarlo.
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McDonough, Suzanne. "The development of short latency inhibition from triceps brachii to biceps brachii in man." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283056.
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Schleißinger, Sebastian [Verfasser], Oliver [Gutachter] Roth, and Filippo [Gutachter] Bracci. "Embedding Problems in Loewner Theory / Sebastian Schleißinger. Gutachter: Oliver Roth ; Filippo Bracci." Würzburg : Universität Würzburg, 2013. http://d-nb.info/1102824917/34.
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Bracco, Garcia Maria Paula [Verfasser]. "Selective steroid hydroxylation by bacterial cytochrome P450 monooxygenases / Maria Paula Bracco Garcia." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1058391046/34.
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Donnini, Matteo. "riprogettazione delle linee di assemblaggio dei bracci telescopici: il caso manitou italia." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/19796/.
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Lo studio svolto presso Manitou Italia S.R.L. nello stabilimento produttivo di Cavazzona tratta la valutazione di un re-layout: l’obiettivo è analizzare la fattibilità tecnica ed economica della riprogettazione di due linee di montaggio dei bracci telescopici in un’altra area aziendale.
L’elaborato vuole introdurre l’azienda presentando la linea di prodotti che realizza e il mercato al quale si rivolge. Verrà presentata la situazione AS-IS: l’attuale disposizione delle linee dei bracci analizzando le criticità riscontrate. Successivamente si andranno a proporre alternative di layout portando alla luce miglioramenti adottabili a livello tecnico e in ottica Lean Manufacturing confrontando vantaggi e svantaggi delle varie proposte.
L’analisi del flusso dei materiali aiuterà a comparare le diverse soluzioni. Inoltre, anche se questo fatto viene spesso trascurato, cambiamenti di layout potrebbero portare anche ad una riduzione del Flow Time del pezzo con rispettive riduzioni di costo del prodotto.
Si valuteranno le attrezzature necessarie da acquistare o semplicemente trasferire nella nuova area e si effettuerà un’analisi costi-benefici.
Si presentaerà una situazione TO-BE completa, quantificando i benefici e risolvendo le problematiche che nasceranno inevitabilmente da un cambiamento di questa portata.
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Lewanski, Danilo. "Teoria dei nodi di bracci robotici nello spazio 3 e 4 dimensionale." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/2338/.
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Riley, Zachary A. "Motor unit activity in human biceps brachii during sustained contractions." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3303832.
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Walker, Donald L. III. "The effects of training the biceps brachii muscle to failure." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40936.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.Includes bibliographical references.
An experimental study was conducted to observe the effects on the size and strength of the biceps brachii muscle of an exercise routine that trained the biceps to failure during each workout. The workout routine used ten exercises that specifically isolated the biceps brachii. A series of experiments measuring the size, maximum force, and relationship between force and electromyographic signal of the biceps muscles was used to test the effectiveness of the failure routine. The month long training program was found to produce significant size and strength gains in the biceps muscle, with an increase in maximum force greater than 30% after four weeks. It was also found that the slow oxidative twitch motor units became able to provide higher forces as indicated by the increase in the force at which fast oxidative twitch motor units were recruited.
by Donald L. Walker, III.
S.B.
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Rababy, Nada. "Estimation of EMG conduction velocity using system identification." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63819.
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Oliveira, Anderson de Souza Castelo [UNESP]. "A eletromiografia em treinamento resistido: avaliação da fadiga muscular, adaptações e relações com parâmetros subjetivos." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/87436.
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O objetivo do presente estudo foi analisar o comportamento das variáveis amplitude e freqüência do sinal eletromiográfico (EMG) dos músculos bíceps do braço (BB), braquiorradial (BR), tríceps do braço (TB) e multifido (MT) em exercícios isotônicos resistidos de flexão do cotovelo, e avaliar o efeito de um treinamento de oito semanas nos valores de limiar de fadiga eletromiográfico (EMGLF), nas variáveis de amplitude e freqüência eletromiográfica, na frequência cardíaca (FC) e na percepção de esforço (PE). Participaram deste estudo 20 voluntários do gênero masculino, divididos em um grupo controle (GC) e um grupo treinamento (GT). Inicialmente, determinou-se a carga máxima isotônica (CMI) para os exercícios rosca bíceps (RB) e rosca Scott (RS). Na semana seguinte, em três dias diferentes, foram realizados os exercícios rosca bíceps, rosca bíceps adaptado (RBA) e rosca Scott, com intensidades de 25%, 30%, 35% e 40% da CMI pelo período de um minuto, um exercício por dia. A partir dos valores de coeficiente de inclinação (slope) das intensidades de carga foram calculados os valores de EMGLF. Antes e após a execução dos exercícios isotônicos foram realizadas contrações isométricas voluntárias máximas (CIVM) e submáximas (50% da CIVM). Durante a realização dos exercícios isotônicos foram registrados valores de FC e de PE. viii Com os valores de EMGLF do músculo BB foi realizado o treinamento do exercício RBA (8 semanas, 2 sessões semanais, 3 séries até a exaustão com 2 minutos de intervalo entre as séries). Foram analisados os valores de FC, PE, força isométrica máxima, bem como a amplitude e frequência da EMG em contrações isométricas máximas, submáximas e isotônicas.
The aim of this study was to analyze the behaviour of electromyographic (EMG) amplitude and frequency of the biceps brachii (BB), brachioradialis (BR), triceps brachii (TB) and multifidus (MT) in different isotonic resistance elbow flexion exercises, and to evaluate the 8 weeks training effect based in the EMG fatigue threshold (EMGFT) in the EMG variables, heart rate (HR), and perceived exertion (PE). 20 healthy males subjects was divided in a control group (CG, n=10) and a training group (TG, n=10). Initially, the one repetition maximum (1RM) isotonic force for biceps curl (BC) and Scott preacher curl (SC), was obtained. On the next week, in three different days, they was perform the BC, adapted biceps curl (ABC) and SC, with 25%, 30%, 35% e 40% of 1RM for one minute, one exercise per day. With the slope values of each load level, the EMGFT was calculated. Before and after the isotonic exercises, was performed isometric maximum voluntary contractions (IMVC) and submaximal (50% of IMVC). During the isotonic exercises, HR and PE was record. Once the BB EMGFT values were obtained, the TG performs training in the ABC exercise (8 weeks, 2 sessions, 3 exhaustive sets with 2 minutes rest). The HR, PE, isometric and isotonic force, as well as the EMG amplitude and frequency in maxima and submaximal isometric and isotonic contractions. Isotonic 166 contractions were analysed by slope and intercept values so linear regressions pre and post training. The results showed after 1 minute rest, there was recovery for BB muscle in EMG amplitude and frequency during the BC (except for total power). There was load level effect for all exercises, mainly for EMG amplitude (root mean square RMS) for BB and BR, with fatigue-induced immediately after the protocol.
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Rajamäki, Niklas. "Styrketräning via ocklusion : en metod för effektivisering av styrketräning." Thesis, Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-369.
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Syfte och frågeställningar
Syftet med undersökningen har varit att jämföra två olika styrketräningsmetoder med olika grader av ocklusion för träning av musculus (m.) biceps brachii med avseende på styrka och hypertrofi.
- Vilken av de två träningsmetoderna påverkar mest effektivt biceps brachiis styrkeutveckling?
- Vilken av de två träningsmetoderna påverkar mest effektivt biceps brachiis storlek?
Metod
Sju manliga försökspersoner fördelade på två grupper (tre i relaxationsgruppen, fyra i kontraktionsgruppen) fick genomgå två tester för att mäta maximal styrka i m. biceps brachii samt ett test för att mäta överarmens omkrets. Därefter fick de träna specifik bicepsträning tre gånger i veckan under fem veckor för att åter testas. Skillnaden i träning för de båda grupperna bestod av en tydlig relaxation (avslappning) en gång under varje rörelsecykel för relaxationsgruppen (relaxationen varade i ca en sekund och utfördes då hanteln var längst ner i rörelsen) medan kontraktionsgruppen ombeddes att kontrahera (spänna) muskeln under hela rörelseförloppet. För- och eftertest jämfördes mot varandra i ett beroende T-test även ökningen i träningsbelastning jämfördes mellan det andra och fjortonde passet. Därefter jämfördes förändringen mellan grupperna.
Resultat
Den enda signifikanta förändringen i båda träningsgrupperna för sig noterades i det funktionella testet, med en ökning av den maximala styrkan (p=0,03 för kontraktionsgruppen; p=0,03 för relaxationsgruppen). En ökning av totalbelastningen i antal kg per träningspass noterades, men ökningarna var inte signifikanta. Vid en jämförelse av träningseffekterna av relaxations- och kontraktionsträning av biceps brachii tillsammans uppnåddes statistisk signifikans såväl avseende ökning av omkrets (p=0,0136), för maximal styrka (p=0,0002) som för den totala belastningen mellan det andra och fjortonde träningspasset (p= 0,0293).
Slutsats
Sammanfattningsvis kan det konstateras att inga tydliga skillnader mellan träningsgrupperna kunnat urskiljas. Om resultaten för de båda träningsgrupperna sammanvägs uppnås en signifikant ökning av såväl omkrets som maximal styrka.
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Lindberg, Eleanor Inez. "Sí, me afectó: The Women of Bracero Families in Michoacán, 1942-1964." Oberlin College Honors Theses / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin152579797379597.
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Ouamer, Mourad. "Caractérisation des vibrations transversales du biceps brachii lors de contractions volontaires isométriques-isotoniques." Paris 5, 1998. http://www.theses.fr/1998PA05S017.
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La contraction musculaire est à l'origine d'un phénomène vibratoire de surface, ou bruit musculaire, qui a été étudié par de nombreux chercheurs durant les quinze dernières années. Les études, menées in vitro sur des muscles stimules, ont toutes montre que la fréquence moyenne du bruit musculaire correspondait à la fréquence de résonance transversale du muscle. Aucune étude n'a eu pour sujet les modes spatiaux de vibration ; on s'attend à ce qu'une structure étendue, telle qu'un muscle, ait des modes de résonance spatio-temporels sous la forme d'ondes stationnaires. J'ai d'abord étudié expérimentalement les modes de vibration du muscle en contraction volontaire isométrique-isotonique. Les résultats obtenus pour les fonctions de corrélation des déplacements à la surface du muscle ont confirmé l'hypothèse des vibrations stationnaires transversales. Pour les faibles contractions le mode fondamental est dominant ; avec l'augmentation de la contraction volontaire, la contribution d'autres modes a été observée. J'ai ensuite propose un modèle stochastique des vibrations de surface, qui généralise le modèle déterministe de barry en incorporant des sources d'excitation à larges bandes. J'ai montré que le processus associe est markovien. Les techniques standard d'étude des processus markoviens m'ont permis de représenter le bruit musculaire dans un espace des phases ou les degrés de liberté sont les moyennes locales (sur des intervalles de temps de plus en plus longs) du vecteur d'état du processus. La courbe représentative dans l'espace des phases est une spirale qui est en très bon accord avec celle obtenue a partir des résultats expérimentaux. L'amortissement de cette spirale permet de quantifier l'atténuation mécanique du muscle, ce qui suggère des applications medico-cliniques.
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Smart, Rowan Roylance. "Influence of biceps brachii tendon mechanics on position-dependent elbow flexor force steadiness." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61465.
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Elbow flexor force steadiness (FS), measured as coefficient of variation (CV) of force, depends on forearm position and strength. Achilles tendon mechanical properties are associated with standing balance and plantar flexion FS; however, little is known about how tendon mechanics contribute to FS of an upper limb muscle such as the elbow flexors. The purpose of this study was to determine the influence of distal biceps brachii tendon mechanics on elbow flexor FS across supinated, neutral and pronated forearm positions. It was hypothesized that maximal voluntary contraction (MVC), stiffness, tendon force and stress would be higher in supinated and neutral, while strain would be higher in pronated, contributing to enhanced FS, as previously observed for supinated and neutral compared with the pronated position. Eleven males performed isometric elbow flexion tasks at low (5, 10% MVC) and high (25, 50, 75%) forces. Tendon elongation and cross-sectional area were recorded with ultrasound during contraction to quantify tendon mechanics among positions. MVC, FS, tendon force and stress were less in pronated (p<0.01). Tendon strain was greater in neutral compared to pronated at 25, 50 and 75% MVC, and compared to supinated at 75% MVC (p≤0.05). Tendon stiffness did not differ among positions (p>0.05). The associations and influence of MVC and tendon mechanics on CV of force were analyzed using Pearson’s correlations and forward multiple regressions, respectively, for low and high force levels. Associations of MVC (-0.61Graduate
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Stewart, Kelly Louise. "Conventional and novel treatments for control of clubroot disease of brassicas." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/4354.
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The aim of this project was to develop treatments that would be able to reduce the survival of clubroot spores in field soil and protect the roots of young transplants against infection. The project focused on using combinations of treatments which integrate novel and existing controls with emphasis placed on the sustainable use of waste materials, plant materials and bioactives. A wide range of treatments were screened individually and in combination under glasshouse and field conditions, e.g. fungicides, nutritional amendments, companion planting, plant saponins and biocontrol agents. Many of these treatments were able to reduce clubroot severity to varying degrees. Glasshouse treatments were more successful at controlling disease than those applied in the field. The most effective treatments - when applied correctly - contained calcium, e.g. lime as calcium oxide or LimeX (a by-product of the sugarbeet processing industry), and crushed scallop and whelk shells (a by-product of the fishing industry). Whilst the effects of calcium and pH on clubroot are not new, growers need to think more in terms of dose of calcium applied in the field rather than just pH, and also, the time of addition of lime to soil before planting needs serious consideration as it may be optimal to apply lime less than two weeks before transplanting. Experimental results have shown that soil microflora plays a major role in the development of clubroot disease and that the membrane potential of growing roots may be one of the most important factors in preventing P. brassicae from entering plant roots and causing disease due to the effect that calcium and pH have on clubroot control. The experiments have also shown that there are interactions between treatments such as fungicides, limes, soil nutritional level and soil microflora at controlling disease and some treatments may reduce the effectiveness of other treatments at controlling disease. Another factor that is known to affect the effectiveness of treatments at controlling clubroot is the initial spore load in the soil. Therefore, an additional aim of the project was to develop a rapid, quantitative PCR based diagnostic test that could measure the level of clubroot spores directly from soil. Plasmodiophora brassicae DNA was successfully extracted and amplified from artificially inoculated soils and from naturally infested field soils using real-time PCR with selected sets of primers and probes. Many different types of soil DNA extraction methods were tested and standard curves relating to different levels of spore inoculum were created. This project has generated useful information as to why there are contradictory results in clubroot research about the effect of various treatments at controlling clubroot. This information may also be the basis of practical advice to brassica growers on best practices to use to achieve optimal clubroot control in the field. Options in relation to new sustainable control treatments are discussed in the light of the results from both glasshouse and field experiments. These involve planting brassicas on raised beds and applying treatments strategically around the root zone. LimeX 70 or powdered calcium oxide were demonstrated to be the most optimal lime treatments for control, and a split application of Perlka (granular calcium cyanamide) may prove to be a consistently effective method for controlling clubroot.
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Oliveira, Anderson de Souza Castelo. "A eletromiografia em treinamento resistido : avaliação da fadiga muscular, adaptações e relações com parâmetros subjetivos /." Rio Claro : [s.n.], 2006. http://hdl.handle.net/11449/87436.
Full textAbstract:
Orientador: Mauro GonçalvesBanca: Benedito Sergio Denadai
Banca: Nadir Tassi
Resumo: O objetivo do presente estudo foi analisar o comportamento das variáveis amplitude e freqüência do sinal eletromiográfico (EMG) dos músculos bíceps do braço (BB), braquiorradial (BR), tríceps do braço (TB) e multifido (MT) em exercícios isotônicos resistidos de flexão do cotovelo, e avaliar o efeito de um treinamento de oito semanas nos valores de limiar de fadiga eletromiográfico (EMGLF), nas variáveis de amplitude e freqüência eletromiográfica, na frequência cardíaca (FC) e na percepção de esforço (PE). Participaram deste estudo 20 voluntários do gênero masculino, divididos em um grupo controle (GC) e um grupo treinamento (GT). Inicialmente, determinou-se a carga máxima isotônica (CMI) para os exercícios rosca bíceps (RB) e rosca Scott (RS). Na semana seguinte, em três dias diferentes, foram realizados os exercícios rosca bíceps, rosca bíceps adaptado (RBA) e rosca Scott, com intensidades de 25%, 30%, 35% e 40% da CMI pelo período de um minuto, um exercício por dia. A partir dos valores de coeficiente de inclinação (slope) das intensidades de carga foram calculados os valores de EMGLF. Antes e após a execução dos exercícios isotônicos foram realizadas contrações isométricas voluntárias máximas (CIVM) e submáximas (50% da CIVM). Durante a realização dos exercícios isotônicos foram registrados valores de FC e de PE. viii Com os valores de EMGLF do músculo BB foi realizado o treinamento do exercício RBA (8 semanas, 2 sessões semanais, 3 séries até a exaustão com 2 minutos de intervalo entre as séries). Foram analisados os valores de FC, PE, força isométrica máxima, bem como a amplitude e frequência da EMG em contrações isométricas máximas, submáximas e isotônicas.
Abstract: The aim of this study was to analyze the behaviour of electromyographic (EMG) amplitude and frequency of the biceps brachii (BB), brachioradialis (BR), triceps brachii (TB) and multifidus (MT) in different isotonic resistance elbow flexion exercises, and to evaluate the 8 weeks training effect based in the EMG fatigue threshold (EMGFT) in the EMG variables, heart rate (HR), and perceived exertion (PE). 20 healthy males subjects was divided in a control group (CG, n=10) and a training group (TG, n=10). Initially, the one repetition maximum (1RM) isotonic force for biceps curl (BC) and Scott preacher curl (SC), was obtained. On the next week, in three different days, they was perform the BC, adapted biceps curl (ABC) and SC, with 25%, 30%, 35% e 40% of 1RM for one minute, one exercise per day. With the slope values of each load level, the EMGFT was calculated. Before and after the isotonic exercises, was performed isometric maximum voluntary contractions (IMVC) and submaximal (50% of IMVC). During the isotonic exercises, HR and PE was record. Once the BB EMGFT values were obtained, the TG performs training in the ABC exercise (8 weeks, 2 sessions, 3 exhaustive sets with 2 minutes rest). The HR, PE, isometric and isotonic force, as well as the EMG amplitude and frequency in maxima and submaximal isometric and isotonic contractions. Isotonic 166 contractions were analysed by slope and intercept values so linear regressions pre and post training. The results showed after 1 minute rest, there was recovery for BB muscle in EMG amplitude and frequency during the BC (except for total power). There was load level effect for all exercises, mainly for EMG amplitude (root mean square RMS) for BB and BR, with fatigue-induced immediately after the protocol.
Mestre
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Félex, Suênia Samara dos Santos. "Elaboração e qualidade de marinado ovino tipo bracciola submetido a diferentes métodos de cocção." Universidade Federal da Paraíba, 2015. http://tede.biblioteca.ufpb.br:8080/handle/tede/9448.
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Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq
The sheep bracciola is a meat product made with the meat of the sheep neck, marinated and wrapped, popularly known as the steak turtleneck, which is presented as a choice of meat products derived from ovine. Considered a low commercial value meat, the use of marination and cooking method are alternatives to adding value and offering a differentiated product to the consumer market. This research aimed to develop and evaluate the microbiological quality, physico-chemical and sensory of sheep bracciola subjected to different types of cooking: sous vide, combined oven and autoclave. The microbiological evaluation were assessed total coliforms and thermotolerant, Staphylococcus aureus, sulphite-reducing Clostridium and presence / absence of Salmonella spp. The physicochemical evaluation, the following parameters were analyzed: yield, water holding capacity, cooking loss of weight, color, pH, Aa, texture and chemical composition. Sensory analysis was conducted by 12 panelists trained through a methodology based on the Quantitative Descriptive Analysis (QDA) in which the color attributes, presence of nerves, degree of hydration, sheep aroma, flavor sheep, salty, tenderness, juiciness and fibrousness were studied . The results of the microbiological analyzes revealed the absence of Salmonella spp. and low total coliform counts and thermotolerant, Staphylococcus aureus and sulphite-reducing Clostridium in the samples evaluated. The physical and chemical quality of sheep bracciola showed an excellent nutritional value, for each 100g of sheep bracciola presented an average of 73g of moisture, 1.6 g ash, 16.0 g of protein and 2.6 g of lipid. In the instrumental texture analysis, samples were highlighted subjected to cooking sous vide (70 ° C for 6h, 12h and 24h) and autoclave, the combined oven under the conditions used in this study, were not enough to make it soft , serving as an indicator for the selection of these samples in the sensory evaluation. The sample baked in an autoclave recorded the highest scores on the attributes studied in sensory analysis, highlighting the softness attribute. Thus, it is concluded that the samples ovine bracciola coupled with the use of cooking methods sous vide and the autoclave showed detachable nutritional value, high protein, low fat and high quality for their sensory softness. Also, because it is inexpensive raw material, the use of this by-product of slaughter can generate income for producers, leveraging the goat and sheep farming sector.
A bracciola ovina é um produto cárneo elaborado com a carne do pescoço ovino, marinado e enrolado, conhecido popularmente como bife a rolê, que se apresenta como uma opção de produtos cárneos derivados de ovinos. Como a carne de pescoço é considerada uma carne dura, o uso da marinação e o método de cocção representam alternativas para agregação de valor e a oferta de um produto diferenciado ao mercado consumidor. A presente pesquisa teve como objetivo elaborar e avaliar a qualidade microbiológica, físico-química e sensorial da bracciola ovina submetida a diferentes tipos de cocção: sous vide, forno combinado e autoclave. Na avaliação microbiológica foram realizadas contagens de coliformes totais e termotolerantes, Staphylococcus aureus, Clostridium sulfito-redutor e presença/ausência de Salmonella spp. Na avaliação físico-química foram analisados os seguintes parâmetros: rendimento, capacidade de retenção de água, a perda de peso por cocção, cor, pH, Aa, textura e composição centesimal. A análise sensorial foi conduzida por 12 provadores treinados através de metodologia fundamentada na Análise Descritiva Quantitativa (ADQ) em que os atributos de cor, presença de nervos, grau de hidratação, aroma ovino, sabor ovino, sabor salgado, maciez, suculência e fibrosidade foram estudados. Os resultados das análises microbiológicas revelaram ausência de Salmonella spp. e baixas contagens de Coliformes totais e termotolerantes, Staphylococcus aureus e Clostridium sulfito-redutor nas amostras avaliadas. Na qualidade físico-química, a bracciola obteve médias de 73% de umidade, 1,6% de cinzas, 16,0% de proteínas e 2,6% de lipídeos. Na análise de textura instrumental, destacaram-se as amostras submetidas a cocção por sous vide (70°C por 6h, 12h e 24h) e em autoclave, o forno combinado, nas condições utilizadas nesse estudo, não foram suficientes para torná-la macia, servindo como indicador para a escolha destas amostras na avaliação sensorial. A amostra cozida em autoclave obteve as maiores médias nos atributos estudados na análise sensorial, destacando-se no atributo maciez. Deste modo, conclui-se que foi possível o desenvolvimento de um novo produto, em que as amostras de bracciola ovina aliada ao uso dos métodos de cocção sous vide e autoclave apresentaram destacável qualidade sensorial por sua maciez e suculência. Além disso, por se tratar de matéria prima de baixo custo, o aproveitamento deste subproduto do abate pode gerar lucro para os produtores, alavancando o setor da caprinovinocultura.
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Harrison, Kimberly L. S. B. Massachusetts Institute of Technology. "Fitts' Law and human control of an electromyographic signal from the biceps brachii muscle group." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40436.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.Includes bibliographical references (leaves 28-29).
Six human subjects performed a modified Fitts' test by moving an electromyographic signal between two targets on a computer screen. For five out of six subjects, the results were consistent with Fitts' Law with correlation coefficients ranging between 29% and 72%. The low correlation of the sixth subject (0.6%) may have been due to electrode misplacement and the adoption of a "strategy" in how she performed the task.
by Kimberly L. Harrison.
S.B.
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Lizu, Afruna. "Effect of the biceps Brachii tendon on elbow flexor force steadiness in men and women." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55635.
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Tendons are connective tissue that transmit force to the skeleton. Therefore, mechanical and material properties of the tendon, such as stiffness, strain, stress and Young’s Modulus likely influence force production and control. Men are steadier than women in maintaining isometric elbow flexion force, but the cause of this sex-related difference in force steadiness (FS) has not been established. To-date most FS studies have centred on absolute force as well as motor unit activity, with limited attention given to the interaction between muscle and tendon. The purpose of this study was to determine whether the mechanical properties of tendon differ between men and women, and whether this contributes to men being steadier than women. Ten men (23 ± 4years) and 10 women (22 ± 3years) who were healthy and recreationally active participated in a single session to evaluate maximal force, steadiness and tendon properties. Submaximal forces of 2.5%, 5%, 10%, 20%, 40% and 60% maximum voluntary contraction (MVC) were executed and FS as well as tendon properties were measured during these efforts. Contractions were randomized within and between individuals for the submaximal isometric elbow flexion contractions. All measures were undertaken during the 5 second steady state contraction executed in a neutral wrist position. Results indicated that men were significantly stronger (p < 0.001), steadier (p < 0.001) and the BB tendon was stiffer (p = 0.03) in men than women. Tendon stiffness and CV of force were strongly correlated (r² = 0.60; r = 0.77; p < 0.001) for women but moderately correlated (r² = 0.21; r = 0.46; p < 0.001) for men. Therefore, our results suggest that having a more compliant BB tendon is likely a contributing factor of less stability in the elbow flexors of women compared to men.Graduate Studies, College of (Okanagan)
Graduate
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Stein, Thomas [Verfasser], and Matthias [Akademischer Betreuer] Pietschmann. "Der Einfluss des Schulterprothesentyps auf die Supinationskraft des M. biceps brachii / Thomas Stein ; Betreuer: Matthias Pietschmann." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1190033011/34.
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Moreno, Leslie. "EL PROGRAMA BRACERO: UN ESTUDIO INTERGENERACIONAL Y TRANSNACIONAL MEDIANTE LA EXPERIENCIA DE LA FAMILIA MORENO-BARRERA." Scholarship @ Claremont, 2018. http://scholarship.claremont.edu/scripps_theses/1213.
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Utilizando estos métodos que resaltan un “énfasis en la entrevista cualitativa” para poder colectar las historias personales de los Braceros y sus familias, en esta tesis analizo las historias orales de mi familia que han sido transmitidas de generación en generación (Uribe et al.). Específicamente, me enfoco en las experiencias de cuatro generaciones: un Bracero (mi Bisabuelo Filiberto) y su esposa, sus hijos (es decir, mi Abuelita Luisa), sus nietos (mis padres), y su bisnieta (yo). El propósito de este enfoque en la memoria intergeneracional de las experiencias de mi Bisabuelo Filiberto y sus descendientes en el Programa Bracero es resaltar los efectos que el Programa Bracero ha tenido en múltiples generaciones de las familias involucradas en él.
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Archer, Akibi A. A. "Spatial characterization of the natural mechanical vibrations occurring in-vivo during isometric contractions of the biceps brachii muscle: towards passive elastography of skeletal muscles." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50139.
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Noninvasive viscoelasticity imaging, or “dynamic elastography”, methods have recently been developed to objectively quantify the local viscoelastic properties of soft tissues by measuring the local propagation velocity of mechanical shear vibrations (e.g. faster velocity indicates stiffer material). But, the existing elastography technologies require a potentially uncomfortable external mechanical stimulation (e.g. vibrations probe) to induce muscle vibrations; and sophisticated and expensive imaging equipments (such as MRI and ultrafast ultrasound elastography), involving complex signal processing, to record and analyze these muscle vibrations. The work in this dissertation lays the foundation for the development of a low cost, passive, non-invasive elastography by analyzing and processing Surface Mechanomyograms (S-MMGs) measured with one dimensional accelerometers from the biceps brachii muscle. Aim 1 of this dissertation focused on the 3-dimensional aspect of vibrations measured by accelerometers on the skin surface above the biceps brachii. While Aim 2 focused on using one-dimensional accelerometers to determine the propagation direction of the propagating S-MMG waves. Using this newly developed knowledge on S-MMG Aim 3 was accomplished, a method to analyze the propagating wave and develop a metric that can track the changes in the muscle was developed, namely, the coherence length. The coherence length was found to significantly increase with increased contraction levels for all seven of the subjects. Overall the results of this study show that the propagation features of S-MMG vibrations reflect the architecture and contraction level of the biceps brachii muscle. Hence S-MMG could potentially be used for monitoring physiological changes of skeletal muscles.
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Döring, Andrea [Verfasser]. "Etablierung eines kontrastmittelgestützten Ultraschallverfahrens zur Beurteilung der Skelettmuskelperfusion am Beispiel des M. biceps brachii des Menschen / Andrea Döring." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2008. http://d-nb.info/1023372525/34.
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Baron, Toaldo Marco <1981>. "Use of VEGFR-2 targeted microbubbles (BR55, Bracco imaging) for the early ultrasound evaluation of response to antiangiogenic treatment in a xenograft model of hepatocarcinoma." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3478/.
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Aim: To evaluate the early response to treatment to an antiangiogenetic drug (sorafenib) in a heterotopic murine model of hepatocellular carcinoma (HCC) using ultrasonographic molecular imaging.
Material and Methods: the xenographt model was established injecting a suspension of HuH7 cells subcutaneously in 19 nude mice. When tumors reached a mean diameter of 5-10 mm, they were divided in two groups (treatment and vehicle). The treatment group received sorafenib (62 mg/kg) by daily oral gavage for 14 days. Molecular imaging was performed using contrast enhanced ultrasound (CEUS), by injecting into the mouse venous circulation a suspension of VEGFR-2 targeted microbubbles (BR55, kind gift of Bracco Swiss, Geneve, Switzerland). Video clips were acquired for 6 minutes, then microbubbles (MBs) were destroyed by a high mechanical index (MI) impulse, and another minute was recorded to evaluate residual circulating MBs. The US protocol was repeated at day 0,+2,+4,+7, and +14 from the beginning of treatment administration. Video clips were analyzed using a dedicated software (Sonotumor, Bracco Swiss) to quantify the signal of the contrast agent. Time/intensity curves were obtained and the difference of the mean MBs signal before and after high MI impulse (Differential Targeted Enhancement-dTE) was calculated. dTE represents a numeric value in arbitrary units proportional to the amount of bound MBs. At day +14 mice were euthanized and the tumors analyzed for VEGFR-2, pERK, and CD31 tissue levels using western blot analysis.
Results: dTE values decreased from day 0 to day +14 both in treatment and vehicle groups, and they were statistically higher in vehicle group than in treatment group at day +2, at day +7, and at day +14. With respect to the degree of tumor volume increase, measured as growth percentage delta (GPD), treatment group was divided in two sub-groups, non-responders (GPD>350%), and responders (GPD<200%). In the same way vehicle group was divided in slow growth group (GPD<400%), and fast growth group (GPD>900%). dTE values at day 0 (immediately before treatment start) were higher in non-responders than in responders group, with statistical difference at day 2. While dTE values were higher in the fast growth group than in the slow growth group only at day 0. A significant positive correlation was found between VEGFR-2 tissue levels and dTE values, confirming that level of BR55 tissue enhancement reflects the amount of tissue VEGF receptor.
Conclusions: the present findings show that, at least in murine experimental models, CEUS with BR55 is feasable and appears to be a useful tool in the prediction of tumor growth and response to sorafenib treatment in xenograft HCC.
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Knarr, Brian A. "Design and analysis of a finite element model of the biceps brachii integrated with dynamic in vivo strain fields." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 196 p, 2008. http://proquest.umi.com/pqdweb?did=1650507211&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.
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Simonetti, Laís Regina. "Maturação dos músculos longissimus e triceps brachii de novilhos Nelore, alimentados com óleo de linhaça in natura ou protegido /." Jaboticabal, 2016. http://hdl.handle.net/11449/141471.
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Orientador: Wignez HenriqueBanca: Renata Tieko Nassu
Banca: Hirasilva Borba
Resumo: Objetivou-se avaliar diferentes tempos de maturação dos músculos longissimus (LD) e triceps brachii (TB), e sua influência sobre os aspectos físicos e químicos da carne de novilhos Nelore confinados, que receberam dieta controle, com óleo de linhaça in natura (3,4 % na MS) ou protegido (4,5 % na MS) da degradação ruminal durante 105 dias na fase de terminação. O volumoso utilizado foi silagem de milho (40% da MS) e as dietas com adição de óleo foram isoenergéticas (76,0% NDT e 6,1% EE). Os animais foram confinados em baias individuais e abatidos com 522,71 ± 27,99 kg de peso corporal e 21-22 meses de idade. Da meia-carcaça esquerda, foram retirados os músculos estudados, que foram fatiados, e os bifes maturados por zero, sete e 14 dias, em câmara de demanda bioquímica de oxigênio (B.O.D.) entre 0 e 2 °C. Nas análises das características físicas e químicas da carne, a maturação afetou a luminosidade, a intensidade de vermelho e a capacidade de retenção de água. As demais variáveis apresentaram interação entre tempo de maturação e músculo, sendo que as perdas por cocção também mostraram efeito da interação entre tempos de maturação e dieta. No desdobramento das interações, a força de cisalhamento apresentou efeito significativo dos tempos de maturação no dia 0 e 14. No dia 0, o músculo TB apresentou menor força de cisalhamento ao contrário do dia 14, que foi menor no músculo LD. E dentro de cada músculo, ambos apresentaram redução (P<0,001) da força de cisalhamento com a matura... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective was to evaluate different aging times of the longissimus and triceps brachii muscles, and their influence on the physical and chemical meat aspects from fattening Nelore steers. The animals were kept in individual pens and received diet with no added oil, with in natura or protected linseed oil, during 105 days of feedlot. The roughage used was corn silage (40% of the MS) and diets with addition of oil were isoenergetic (76.0% NDT and 6.1% EE). The animals were slaughtered with 522.71 ± 27.99 kg of body weight and 21-22 months of age. From the left half carcass, muscles were removed and sliced; steaks were aged during zero, seven and 14 days, between 0 and 2 °C in Biochemical Oxygen Demand chamber. Aging time affected the meat lightness, the intensity of red and the water holding capacity. The other variables showed interaction between aging time and muscle, and cooking losses also showed the effect of interaction between aging time and diet. Shear force presented significant effect of aging time on the day 0 and 14; at day 0, the triceps muscle showed lower shear force, while at day 14, longissimus was softer. Both muscles decreased the shear force by aging time in a quadratic way. Interaction among aging time and muscle were found for most of fatty acids quantity, except for linoleic (C18:2 n-6), α-linolenic (C18:3 n-3), conjugate linoleic (C18:2 cis trans 11 9), arachidic (C20:0), eicosadienoic (C20:2), eicosatrienoic (C20:3 n-6), arachidonic (C20:4 n-6), eic... (Complete abstract click electronic access below)
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Barroso, Jorge Augusto. "Caracter?sticas de m?sculos de grupos gen?ticos de bovinos terminados em confinamento." UFVJM, 2013. http://acervo.ufvjm.edu.br:8080/jspui/handle/1/327.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
Foram avaliados os Longissimus dorsi et lumborum (LTL), Semitendinosus (ST) e Triceps brachii (TB) obtidos de seis animais ?Guzer? ?Nelore ?Simmental (Tri), seis animais ?Guzer? ?Nelore (GN) e seis animais ?Guzer? ?Holand?s (GH), recriados a pasto com suplementa??o, terminados em confinamento de 82 dias e abatidos aos 24 meses. Foram mensurados o pH24horas, a capacidade de reten??o de ?gua, luminosidade (L*), teor de prote?na total, extrato et?reo, mat?ria seca, res?duo mineral fixo, teor de vermelho (a*), teor de amarelo (b*), croma (C*), matiz (H*), perdas de peso por cozimento, teor de col?geno total e sol?vel, ?ndice de fragmenta??o miofibrilar e for?a de cisalhamento. N?o houve efeito significativo (P>0,05) dos grupos gen?ticos sobre o pH24horas do LTL (5,64), do ST (5,72) e TB (5,85). Os valores de pH24horas do LTL, refer?ncia ? carca?a, estiveram dentro do intervalo de normalidade (5,3-5,7). Os grupos gen?ticos tamb?m n?o influenciaram, significativamente, o teor de extrato et?reo, os teores de prote?na e mat?ria seca, res?duo mineral fixo, teor de amarelo, o matiz, as perdas de peso por cozimento, o ?ndice de fragmenta??o miofibrilar, assim como o teor de col?geno total e sol?vel. A for?a de cisalhamento e a capacidade de reten??o de ?gua foram, no entanto, influenciados pelos grupos gen?ticos, observando maior maciez no grupo GH, em rela??o ao GN. A capacidade de reten??o de ?gua apresentou maiores valores para o grupo GN em rela??o ao grupo GH, o que n?o demonstrou impacto sobre as principais qualidades comerciais da carne. O teor de vermelho e o croma apresentaram intera??es entre os grupos gen?ticos e os m?sculos estudados, sendo a varia??o dentro do grupo GH, diferente dos demais grupos gen?ticos, apresentando valores menores no ST, em rela??o aos demais grupos gen?ticos, e, substancialmente, maiores valores no TB em rela??o aos demais m?sculos. Comparando-se as caracter?sticas entre os diferentes m?sculos, foram percebidas diferen?as significativas em todos os par?metros estudados, dentre elas a menor for?a de cisalhamento do TB, e tamb?m do ST em rela??o ao LTL. Tal fato talvez seja decorrente do maior teor de extrato et?reo, das menores perdas de peso por cozimento do TB e do maior ?ndice de fragmenta??o miofibrilar do TB e ST. Admite-se, tamb?m, que varia??es em par?metros, quando comparados LTL, ST e TB entre si, decorram de especificidades anat?micas e fisiol?gicas dos m?sculos que os originaram. Conclui-se que, os grupos gen?ticos apresentaram semelhan?a em quase todos os par?metros de qualidade estudados, demonstrando, por?m, menores valores de for?a de cisalhamento para o grupo GH. Foi tamb?m representativa a melhor qualidade do TB, medida por par?metros objetivos, em rela??o aos demais m?sculos estudados.
Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2013.
ABSTRACT Were tested Longissimus dorsi et lumborum (LTL), Semitendinosus (ST) e Triceps brachii (TB) obtained from six animals ?Guzer? ?Nellore ?Simmental (Tri), six animals ?Guzer? ?Nellore (GN) and six ?Guzer? ?Holstein (GH) recreated with pasture supplementation, 82 days in feedlot and slaughtered at 24 months. We measured the pH24hors, the ability to retain water, lightness (L*), total protein, ether extract, dry matter, fixed mineral residue, redness (a*), yellowness (b*), chroma (C*), hue (H*), cooking weight loss, total collagen and soluble, myofibrillar fragmentation index and shear force. There was no significant effect on pH 24hours (P> 0.05) between the genetic groups on the LTL (5.64), ST (5.72) and TB (5.85). The PH 24hours values of LTL, the reference substrate, were within the normal range (5.3 to 5.7). Genetic groups did not significantly influence the content of fat, the protein, dry matter and mineral, the yellowness, the hue, the weight losses by cooking, myofibrillar fragmentation index, as well as the content of total and soluble collagen. The shear force and the water retention capacity were influenced by genetic groups. The GH group was more tenderness than in the GN group. The capacity of water retention was higher in the GN group than in the GH group, which showed no impact on the main commercial qualities of meat. The content of red and chroma showed interactions among genetic groups and the muscles studied, and the variation in the GH group unlike other genetic groups had lower values in the ST and the other genetic groups had substantially higher values for TB compared to other muscles. Comparing the properties of the different muscles, significant differences were observed in all parameters studied, among them the lowest shear force of TB, and also the ST compared to LTL. This fact might be due to the higher content of fat, the less weight loss by cooking the TB and higher myofibrillar fragmentation index of TB and ST. Also it is assumed that variations in parameters when compared LTL, ST and TB among themselves, might be resulting of anatomical and physiological peculiarities of the muscles that originated them. We can conclude that the genetic groups were similar in almost all quality parameters studied, but lower values of shear force on the GH group. Also was relevant the best quality of TB, measured by objective parameters, compared to the other muscles studied.
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Rojas, Juan A. "Pos/modernidad y (multi)forma en la obra de dos poetas mexicanoscontemporaneos: Alberto Blanco y Coral Bracho." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/280090.
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Pos/modernidad y (multi)forma en la obra de dos poetas mexicanos contemporaneos: Alberto Blanco y Coral Bracho studies the effects of modernity in Contemporary Mexican poetry. According to literary critics such as Evodio Escalante and Christopher Dominguez, Blanco and Bracho in their radical experimentation of poetic language create a multiform that concedes diverse possibilities of expression. This dissertation is theoretically backed by the works of Nestor Garcia Canclini and Edward O. Wilson, which allow me to underscore the importance and influence of politics, economics, and culture in these Mexican poets. Chapter Two analyzes twenty-two poetic anthologies with the intention of demonstrating the effects of posmodernity in poetic production and diffusion as well as to create a historiographic approach to the generation of poets from the 50s. Chapters Three and Four observe the poetic multiform in the works of Blanco and Bracho respectively. This analysis in grounded in the theoretical insights of Edward O. Wilson that explain how Consilience is the unity of knowledge through science and humanities. Consequently, Blanco explores the various theories of Physics, specifically the fractals and the hologram, while Bracho follows the discourse of Deleuze and Guattari about Rhizomes.
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Vieira, Leonardo Dimas do Carmo. "Parâmetros qualitativos dos músculos Longíssimus dorsi e Tríceps Brachii em diferentes períodos de maturação provenientes de quatro cruzamentos de bovinos /." Jaboticabal : [s.n.], 2011. http://hdl.handle.net/11449/96574.
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Resumo: Avaliou-se o efeito de diferentes períodos de maturação (1, 7, 14 dias) sobre a qualidade da carne de dois músculos (Longíssimus dorsi e Tríceps braquii) de bovinos cruzados, criados em confinamento no sistema "superprecoce". Foram utilizados 40 bovinos machos não castrados, divididos em quatro cruzamentos, oriundos do acasalamento de fêmeas cruzadas ½ angus + ½ nelore e ½ simental + ½ nelore com touros das raças Angus e Wagyu. Os animais foram confinados em lotes de 4 animais por baia divididos por grupo genético. Após o abate e estabelecimento do rigor-mortis (24 horas) coletou-se amostras dos músculos Longíssimus dorsi e Tríceps braquii, que foram embalados a vácuo e submetidos à maturação (0, 7 e 14 dias). Foram avaliadas características qualitativas (capacidade de retenção de água, cor, pH, perdas de peso por cozimento e força de cisalhamento) e sensoriais (sabor, odor, suculência, fibrosidade, maciez, sabor de gordura e aceitação global). Utilizou-se um delineamento inteiramente casualizado em esquema fatorial 4 x 3 x 2 (4 cruzamentos x 3 períodos de maturação x 2 músculos) com 10 repetições. Os dados foram submetidos à análise de variância e as médias comparadas pelo teste Tukey com 5% de significância. A maturação é eficiente na melhoria da maciez da carne dos animais avaliados. Os animais filhos de touro Wagyu apresentaram carne com sabor de gordura mais acentuado através da avaliação sensorial. O músculo Tríceps brachii foi considerado mais macio e mais suculento tanto na análise sensorial como nas análises físicas, contudo, o músculo Longíssimos dorsi apresentou maior aceitação globalAbstract: We evaluated the effect of different periods of maturation aged (0, 7 and 14 days) on meat quality of two muscles (Longíssimus dorsi and Triceps braquii) of crossbred beef cattle, reared in confinement in the system "youngbulls". We used 40 bulls divided into four crossbred from the mating of cows crossbred ½ Angus + ½ Nelore e ½ Simental + ½ Nelore with bulls Angus and Wagyu. The animals were confined in collective stalls 4 animals for pen divided by genetic groups. After slaughter and establishment of rigor mortis (24 hours) samples were collected from muscles Longíssimus dorsi e Triceps braquii, which were vacuum packed and submitted of maturation aged (0, 7 and 14 days). We evaluated quality characteristics (water-holding capacity, color, pH, weight loss for cooking and shear force) and sensory (flavor, scent, juiciness, fibrousness, softness, fat flavor and global acceptance). It was used a 4 x 3 x 2 factorial arrangement (4 crossbred x 3 maturation aged x 2 muscles) with 10 replicates. The dates submitted analysis of variance and the means were compared by Tykey's test (5%). The maturation aged is proved effective improvement the meat in the animals evaluated. The animals crossbred Wagyu bull presented meat-flavored fat sharper through sensory evaluation. The muscle Tríceps brachii was considered more soft and juicy both in sensory evaluation as in physical analysis, however, the muscle Longíssimus dorsi showed higher global acceptance
Orientador: Pedro Alves de Souza
Coorientador: Rymer Ramiz Tullio
Banca: Rafael Silvio Bonilha Pinheiro
Banca: Jane Maria Bertocco Ezequiel
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Vieira, Leonardo Dimas do Carmo [UNESP]. "Parâmetros qualitativos dos músculos Longíssimus dorsi e Tríceps Brachii em diferentes períodos de maturação provenientes de quatro cruzamentos de bovinos." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/96574.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Avaliou-se o efeito de diferentes períodos de maturação (1, 7, 14 dias) sobre a qualidade da carne de dois músculos (Longíssimus dorsi e Tríceps braquii) de bovinos cruzados, criados em confinamento no sistema “superprecoce”. Foram utilizados 40 bovinos machos não castrados, divididos em quatro cruzamentos, oriundos do acasalamento de fêmeas cruzadas ½ angus + ½ nelore e ½ simental + ½ nelore com touros das raças Angus e Wagyu. Os animais foram confinados em lotes de 4 animais por baia divididos por grupo genético. Após o abate e estabelecimento do rigor-mortis (24 horas) coletou-se amostras dos músculos Longíssimus dorsi e Tríceps braquii, que foram embalados a vácuo e submetidos à maturação (0, 7 e 14 dias). Foram avaliadas características qualitativas (capacidade de retenção de água, cor, pH, perdas de peso por cozimento e força de cisalhamento) e sensoriais (sabor, odor, suculência, fibrosidade, maciez, sabor de gordura e aceitação global). Utilizou-se um delineamento inteiramente casualizado em esquema fatorial 4 x 3 x 2 (4 cruzamentos x 3 períodos de maturação x 2 músculos) com 10 repetições. Os dados foram submetidos à análise de variância e as médias comparadas pelo teste Tukey com 5% de significância. A maturação é eficiente na melhoria da maciez da carne dos animais avaliados. Os animais filhos de touro Wagyu apresentaram carne com sabor de gordura mais acentuado através da avaliação sensorial. O músculo Tríceps brachii foi considerado mais macio e mais suculento tanto na análise sensorial como nas análises físicas, contudo, o músculo Longíssimos dorsi apresentou maior aceitação global
We evaluated the effect of different periods of maturation aged (0, 7 and 14 days) on meat quality of two muscles (Longíssimus dorsi and Triceps braquii) of crossbred beef cattle, reared in confinement in the system “youngbulls”. We used 40 bulls divided into four crossbred from the mating of cows crossbred ½ Angus + ½ Nelore e ½ Simental + ½ Nelore with bulls Angus and Wagyu. The animals were confined in collective stalls 4 animals for pen divided by genetic groups. After slaughter and establishment of rigor mortis (24 hours) samples were collected from muscles Longíssimus dorsi e Triceps braquii, which were vacuum packed and submitted of maturation aged (0, 7 and 14 days). We evaluated quality characteristics (water-holding capacity, color, pH, weight loss for cooking and shear force) and sensory (flavor, scent, juiciness, fibrousness, softness, fat flavor and global acceptance). It was used a 4 x 3 x 2 factorial arrangement (4 crossbred x 3 maturation aged x 2 muscles) with 10 replicates. The dates submitted analysis of variance and the means were compared by Tykey's test (5%). The maturation aged is proved effective improvement the meat in the animals evaluated. The animals crossbred Wagyu bull presented meat-flavored fat sharper through sensory evaluation. The muscle Tríceps brachii was considered more soft and juicy both in sensory evaluation as in physical analysis, however, the muscle Longíssimus dorsi showed higher global acceptance
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Eriksson, Madeleine. "The effect of Post activation potentiation on triceps brachii and latissimus dorsi on the aerobic performance of elite freestyle swimmers." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-33934.
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Background: Competitive swimming is a sport that require high muscle strength to overcome the forces in the water. A phenomenon called post activation potentiation (PAP) is known to acutely increase power output. PAP can be defined as an increase in muscle performance after muscle contraction. Previous research on PAP has shown positive effects on different sports, including swimming. However, a limited amount of studies exists on PAP associated with swimming and distances longer than 100 meters. Aim: The aim of the study was to investigate if PAP for triceps brachii and latissimus dorsi with elastic bands can improve the aerobic performance, V4-speed, of elite freestyle swimmers. Methods: 13 elite swimmers participated in this study (mean ±SD: age 18 ±1.15). The participants performed three test sessions on two different days. The first occasion evaluated aerobic performance, V4-speed, where the participants performed a 400-m freestyle swim race and lactate and time were collected. At the second occasion, a 10-repetition maximum (RM) elastic resistance band test was done to get the right resistance band for each individual participant for the PAP exercise. At the third occasion, a PAP exercise, that mimics freestyle swim, with elastic resistance band was performed with 10 repetitions in two sets. After, a rest of six minutes was performed and then the same 400-m freestyle swim test as the first occasion. A paired samples t-test was used to evaluate significant differences between the swim test performed with and without a PAP exercise. Results: The study showed no statistical difference between the V4-speed with or without PAP exercise (p=0.93). An increase in lactate was seen after the PAP exercise (p=0.02). Conclusion: This study could not ensure an improvement of the aerobic performance, V4-speed, of elite swimmers when a PAP exercise, similar to a freestyle stroke, was performed before a 400-m submaximal freestyle swim race with elastic resistance band. Further research must be done in this area before coaches and athletes can apply this in training programs.
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Dullat, Julia Ariane [Verfasser], and Joachim [Akademischer Betreuer] Boos. "Präklinische Evaluation des Telomeraseinhibitors BRACO 20 an Neuroblastomzelllinien / Julia Ariane Dullat. Betreuer: Joachim Boos." Münster : Universitäts- und Landesbibliothek der Westfälischen Wilhelms-Universität, 2012. http://d-nb.info/1027018742/34.
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Fälth, Jenny. "Differences in bench press muscle activation with and without pre-exhaustion of triceps brachii in men and women : An electromyographic study." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-33922.
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Abstract Background. The pre-exhaustion (PE) method is a way to target a stronger muscle in a multi-joint exercise by isolating the stronger muscle immediately before the multi-joint exercise. It has been shown that this principle give greater magnitude of muscular activation in the synergistic secondary mover. There is also some indications that the PE method gives a greater neuromuscular activation of the primary mover when PE the synergist. If there are any differences between men and women in muscle activity has never been investigated before. Men have a greater absolute strength than women, especially in their upper body. There are still conflicting results if they also have greater relative strength. Aim. The purpose of the present study was to investigate if there were any neuromuscular differences between men and women when PE triceps brachii before bench press and if there was any differences in relative strength during 10RM bench press. Methods. 15 men and 15 women was randomly signed up in two different protocols. Protocol 1 started with bench press at 10 repetition maximum (10RM) and after five minutes of recovery, they performed the pre-exhaustion exercise (triceps extensions to failure) immediately before a second round of bench press with the same load on the barbell. Protocol 2 started with triceps extensions to failure immediately before bench press at their 10RM. They also had five minutes of recovery before they performed 10 repetitions of bench press. The magnitude of muscular activation were collected with surface electromyography and then processed through average root mean square (RMS). The values were normalized to muscular voluntary isometric contraction (MVIC) and expressed as percent of MVIC. The muscles that was analysed was triceps brachii (TB), pectoralis major (PM) and deltoideus anterior (DA). Results. The results showed that women had a statistically significantly higher muscular activity in all three muscles; PM (p=0.001) TB (p=0.023) and DA (p=0.047) after pre-exhaustion of TB before bench press compared to only bench press. Men showed only a statistical significant higher activation in PM (p=0.003) and a trend of higher activation in DA (p=0.061). There was a statistically significant difference in muscle activity between women and men in TB (p=0.015) but not in DA (p=0.902) and PM (p=0.436). There was no statistically significant difference between relative strength (volume load/fat free mass) (p=0.775) nor number of repetitions in bench press after PE of TB (p=0.713) between the sexes. Conclusion. The main findings in this study is that it was a statistically significant difference in neuromuscular activity in TB between men and women when PE was applied to TB before the bench press compared to bench press only, but no difference in relative strength.
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Alvim, Felipe Costa. "Investigação das propriedades do sinal eletromiográfico do músculo bíceps braquial em diferentes níveis de força isométrica voluntària." Universidade Federal de Juiz de Fora, 2012. https://repositorio.ufjf.br/jspui/handle/ufjf/1655.
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FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Introdução: O sistema nervoso central (SNC) utiliza o recrutamento de unidades motoras e a modulação da frequência de ativação dessas unidades para controlar a força voluntária exercida por um músculo. A eletromiografia de superfície (sEMG) pode ser utilizada para captar o sinal elétrico resultante do somatório dos potenciais de ação das fibras musculares recrutadas durante o processo de produção de força. A análise da variável root mean square (RMS) e da frequência mediana (Fm) tem sido utilizada para extrair informações a respeito dos mecanismos de controle da força utilizados pelo SNC. Objetivos: Investigar as propriedades do sinal eletromiográfico de indivíduos adultos através das variáveis RMS, Fm e da análise da distribuição da potência por faixas de frequência em contrações isométricas para os níveis de força iguais a 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% e 90% da contração isométrica voluntária máxima (CIVM). Metodogia: Os sinais eletromiográficos foram obtidos a partir da contração isométrica voluntária do bíceps braquial de vinte voluntários jovens saudáveis bilateralmente nos níveis submáximos de força. Um algoritmo foi elaborado visando identificar o trecho ideal do sinal eletromiográfico a ser analisado. As variáveis RMS, Fm e a densidade de potências por faixa de 5 Hz e 10 Hz foram calculadas. Resultados e discussão: A variável RMS apresentou aumento linear com o incremento da força, conforme esperado. A variável Fm apresentou aumento entre 10% e 30% da CIVM e diminuiu para níveis de força superiores. Esse comportamento pode estar relacionado ao protocolo experimental conforme indicado na literatura. A análise da densidade de potência por faixa mostrou uma concentração da densidade de potência na faixa entre 40 e 50 Hz em 10% da CIVM. Essa concentração de potência diminuiu progressivamente em 20% e 30% do nível de força e voltou a ocorrer, na mesma faixa de frequência, em 40% da CIVM. Esse comportamento pode estar relacionado ao acréscimo de fibras de contração dos tipos IIa e IIb ao processo produção de força. Entre 40 e 90% da CIVM a concentração de potência na faixa entre 40 e 50 Hz diminui. Conclusões: As variáveis extraídas do sinal eletromiográfico apresentaram comportamento compatível com o descrito na literatura em protocolos contendo contrações em diversos níveis submáximos da CIVM. Suas variações podem estar relacionadas a diferenças no protocolo experimental. A análise da densidade de potência por faixa de frequências pode trazer informações adicionais estando relacionadas ao processo de recrutamento e ativação das unidades motoras durante o incremento de força.
Introduction: Central nervous system (CNS) uses the motor unit recruitment and the rate coding of the recruited units to control the voluntary force exerted by a muscle. Surface electromyography (sEMG) can be used to capture the electrical signal resulting from the summation of the action potentials of the muscle fibers recruited during the force production. The analysis of the variable root mean square (RMS) and median frequency (Fm) has been used to extract information about the control mechanisms of force used by the CNS. Objectives: To investigate the properties of the electromyographic signal through RMS and Fm variables and analyze the power density distribution in frequency bands in isometric force levels equal to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90% of maximal voluntary isometric contraction (MIVC). Methods: The signals were obtained bilaterally from the isometric contraction of the biceps brachii muscle of twenty young healthy volunteers in submaximals force levels. An algorithm was developed to identify the ideal section of the electromyographic signal to be analyzed. The variable RMS, Fm and power density distribution in frequency bands of 5 Hz and 10 Hz were calculated. Results and discussion: The variable RMS increased linearly with increasing force, as expected. The variable Fm had increased between 10% and 30% MVIC and than decreased toward high force levels. This behavior can be related to the experimental protocol as described in the literature. The analysis of the power density distribution in frequency bands showed a concentration of power density in the range between 40 Hz and 50 Hz in 10% MIVC. This power density concentration progressively reduced in 20% to 30% of the MIVC and occurs again on the same frequency range in 40% MVIC. This behavior may be related to increased fibers type IIa and IIb to the force production process. From 40% to 90% of the MIVC the concentration in power density in range between 40 Hz and 50 Hz decreases. Conclusions: The variables extracted from the EMG signal showed behavior compatible with the protocols described in the literature containing submaximal contractions at different levels of MIVC. Their variations may be related to differences in experimental protocol. The analysis of power density distribution in frequency bands can provide additional information being related to the recruitment and rate coding of motor units during the increase in voluntary force.
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Drohomirecka, Marzena [Verfasser], and Carl-Detlev [Akademischer Betreuer] Reimers. "Messung des reaktiven Anstiegs der Durchblutung des M. biceps brachii von Frauen mittels Farbduplexsonographie nach isometrischer Belastung / Marzena Drohomirecka. Betreuer: Carl-Detlev Reimers." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2010. http://d-nb.info/1044074108/34.
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Arreguín, Sanchez Yadira, and Sanchez Yadira Arreguín. "La resignificación de las estructuras de sentido en las familias que participaron en el programa bracero, del municipio de Apaseo el Alto, Guanajuato." Tesis de Licenciatura, Universidad Autónoma del Estado de México, 2013. http://hdl.handle.net/20.500.11799/40469.
Full textAbstract:
El presente trabajo fue desarrollado en una comunidad llamada La Cuevita, situada en el municipio de Apaseo el Alto, Guanajuato, México. Siendo una comunidad rural, La cuevita ha mantenido lazos transnacionales con migrantes desde los años 50´s con el Programa Bracero, conoció la migración con este Programa, fenómeno que desde entonces ha permanecido en la comunidad y que a lo largo del tiempo ha modificado sus modelos. Las mujeres participaron en la migración permaneciendo en México, en casa, incursionando un ámbito fuera de casa, reconfigurando sus roles a la salida del marido y resignificando a la vez todo aquello que le daba sentido a su vida. A través de la memoria que en primera instancia puede parecer particular se trata pues de memoria colectiva; los recuerdos, hechos y actividades que resignifican las mujeres en el presente rememorando sucesos de hace más de cincuenta años.
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García, Vidal José Antonio. "Aportaciones al conocimiento electromiográfico y dinamométrico de la flexo/extensión de codo." Doctoral thesis, Universidad de Murcia, 2013. http://hdl.handle.net/10803/117530.
Full textAbstract:
El objetivo general del trabajo fue realizar aportaciones al conocimiento dinamométrico y electromiográfico de la articulación del codo. Para ello se analizó la fuerza isométrica máxima y su variabilidad inter e intraobservador, así como el comportamiento electromiográfico de bíceps y tríceps en diferentes ejercicios dinámicos sobre una población de 23 sujetos sanos. Se determinó también la influencia del género y de la dominancia. Los resultados de las mediciones dinamométricas mostraron valores más altos de fuerza isométrica en los varones, observándose una alta correlación con la talla y el peso corporal. Un CCI>0.71 en todas las mediciones demostró la fiabilidad y reproductibilidad de este método a 90º de flexión. No se encontraron diferencias en cuanto a la lateralidad. La actividad EMGs aumentó con la carga e intensidad del ejercicio dinámico, principalmente en el bíceps. Se demostró la gran influencia del sexo y la dominancia sobre los resultados.The aim of this study was to make contributions to the knowledge of isometric dynamometry and surface electromyography of the elbow joint. We analyzed the maximal isometric force and inter-intraobserver variability also the electromyographic behavior of biceps and triceps brachii in different dynamic exercises on a population of 23 healthy people. We determined the influence of gender and dominance too. Dynamometric measurements showed higher values of isometric strength in men, showing a high correlation with height and body weight. An ICC>0.71 for all measurements demonstrated the reliability and reproducibility of this method at 90º of elbow flexion. There were no differences between dominant and nondominant side. The sEMG activity increased with the load and intensity of dynamic exercise mainly in the biceps brachii. It showed the great influence of sex and dominance on the results.
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André, Luc. "Analyse électromyographique et biomécanique des conditions optimales d'activation de muscles bifonctionnels." Compiègne, 1993. http://www.theses.fr/1993COMPD665.
Full textAbstract:
Ce travail expérimental vise à mieux comprendre les modalités d'activation de muscles bifonctionnels. Pour ce faire, les électromyogrammes de surface de muscles bifonctionnels sont analysés tant dans le domaine fréquentiel que dans le domaine temporel, les données électromyographiques étant recueillies au cours d'efforts mono ou bifonctionnels. L'étude a porté essentiellement sur le muscle Biceps brachii, mais d'autres muscles ont aussi été étudiés (Pronator teres, Tibialis anterior, Brachioradialis, et Brachialis) pour tenter de généraliser les résultats obtenus sur le Biceps brachial. L'étude des paramètres spectraux des EMG est menée à partir d'enregistrements effectués lors d'efforts isométriques-isonergétiques. Les relations EMG/Couple et EMG/Angle ont été établies à partir d'efforts isométriques incrémentaux ou progressifs, en simple ou double tâche. Un logiciel spécifique a été développé pour construire ces relations à partir des efforts en rampe. Les résultats mettent en évidence une certaine indépendance des chefs du Biceps brachii objectivée par la variation des paramètres spectraux selon le chef musculaire considéré et la fonction exercée. Dans sa fonction principale, le muscle bifonctionnel présente généralement une énergie plus faible que dans sa fonction secondaire ; au cours d'efforts bidirectionnels, le muscle bifonctionnel présente toujours de forts niveaux d'activation et ce d'autant plus que sont imposées au sujet des conditions adverses, angle articulaire défavorable par exemple. L'ensemble de ce travail doit trouver des prolongements dans les domaines de renforcement et rééducation musculaires.