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Gonçalves, Ana Clara Campagnolo Real [UNESP]. "Exercício resistido em cardiopatas: revisão sistemática da literatura e análise do comportamento autonômico em recuperação pós-exercício resistido aplicado de forma aguda." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/87292.
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goncalves_accr_me_prud.pdf: 684147 bytes, checksum: a81c4f89900e68d55d13d636f49523a1 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>A perda de massa muscular secundária à idade e à inatividade física é clinicamente relevante na população cardíaca, contudo a prescrição do exercício resistido dinâmico para esses pacientes apresenta-se inconclusiva na literatura. Objetivo: Reunir informações sobre a especificidade dos componentes do treinamento resistido prescrito à população cardiopata. Metodologia: Foi realizada busca sistemática de literatura, a partir das bases de dados LILACS, SciELO e PubMed, utilizando os seguintes descritores na língua portuguesa: força muscular, exercício isométrico, esforço físico, cardiopatia e coronariopatia, e seus correspondentes na língua inglesa (muscle strength, isometric exercise, physical effort, heart disease e artery coronary disease), os quais foram...<br>Loss of muscle mass secondary to age and physical inactivity is clinically relevant in cardiac population, however dynamic resistance exercise prescription to these patients presents inconclusive in literature. Objective: Adjoin information about specific components of resistance exercise prescribed to cardiac population. Methodology: Systematic search was performed, using the data bases LILACS, SciELO and PubMed. The descriptors used were: muscle strength, isometric exercise, physical effort, heart disease and artery coronary disease, which were surveyed separately and combined, considering for this review articles that ... (Complete abstract click electronic access below)
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Al-Mulla, M. R. "Automated non-invasive techniques for prediction and detection of localised muscle fatigue during isometric and non-isometric contractions." Thesis, University of Essex, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.537920.
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Benson, Amanda Clare. "The effect of resistance training for cardiac patients on activities of daily living /." View online, 1996. http://repository.eiu.edu/theses/docs/32211998837419.pdf.
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Burghard, Oliver [Verfasser]. "Calculating Sparse and Dense Correspondences for Near-Isometric Shapes / Oliver Burghard." Bonn : Universitäts- und Landesbibliothek Bonn, 2018. http://d-nb.info/1161462333/34.
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Wang, Jia. "Isometric versus Elastic Surfboard Interfaces for 3D Travel in Virtual Reality." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/874.
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Three dimensional travel in immersive virtual environments (IVE) has been a difficult problem since the beginning of virtual reality (VR), basically due to the difficulty of designing an intuitive, efficient, and precise three degrees of freedom (DOF) interface which can map the user's finite local movements in the real world to a potentially infinite virtual space. Inspired by the Silver Surfer Sci-Fi movie and the popularity of the Nintendo Wii Balance Board interface, a surfboard interface appears to be a good solution to this problem. Based on this idea, I designed and developed a VR Silver Surfer system which allows a user to surf in the sky of an infinite virtual environment, using either an isometric balance board or an elastic tilt board. Although the balance board is the industrial standard of board interface, the tilt board seems to provide the user more intuitive, realistic and enjoyable experiences, without any sacrifice of efficiency or precision.
To validate this hypothesis we designed and conducted a user study that compared the two board interfaces in three independent experiments that break the travel procedure into separate DOFs. The results showed that in all experiments, the tilt board was not only as efficient and precise as the balance board, but also more intuitive, realistic and fun. In addition, despite the popularity of the balance board in the game industry, most subjects in the study preferred the tilt board in general, and in fact complained that the balance board could have been the cause of possible motion sickness. "
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Liu, Junshi, Caleb D. Bazyler, Christopher B. Taber, Tony Pustina, and Satoshi Mizuguchi. "Application of Principal Components Analysis in Kinetics Study for Isometric Squat." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etsu-works/3839.
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Williams, Duane A., Courtney D. Hall, Patsy Cantor, et al. "Reliability of Two Alternative Methods for the Standard Mid-thigh Isometric Pull." Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/etsu-works/573.
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The purpose of this study was to determine the reliability of two new alternative portable methods for measuring maximal isometric force measures while performing the standard mid-thigh pull. One method, the bar grip method, required the use of the trunk and upper extremity muscles, while the second method, the pelvic belt method, did not. Both methods demonstrated good test-retest reliability via randomized repeated measures over 24-36 hours. Interestingly, the pelvic belt method generally demonstrated average maximal forces up to 65% higher than the bar method. There was a good relationship between both methods. These new alternative methods could provide strength coaches an option for a more efficient, cost-effective, portable means for the mid-thigh pull test.
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Kullander, Christoffer. "Corticospinal mechanisms for muscle activation in resistance-trained and non-trained males : A cross-sectional study." Thesis, Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-3830.
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Aim The purpose of this study was to compare resistance-trained (RT) and non-trained (NT) males regarding mechanisms for neural activation during isometric muscle contractions of the soleus muscle. Further the plantar flexor strength of the two groups were compared. Method Ten males that had been resistance training for at least 3 years (RT) and 10 who did not train regularly (NT) participated in the study. The participants performed isometric contractions of their right plantar flexors against an isokinetic dynamometer at 15, 25, 50, 80 and 100% of maximal voluntary contraction. Five contractions were performed for each level in two different conditions; one where the participants were stimulated using transcranial magnetic stimulation over the left motor cortex and one in which they were stimulated electrically over the tibial nerve. Stimulations were also delivered at rest. The resulting soleus muscle motor evoked potentials (MEPs) and V-waves were normalized to a maximal M-wave (Mmax). Plantar flexor strength was measured and voluntary activation estimated using the twitch interpolation technique. Results No significant difference was found between the RT and the NT group for voluntary activation, V/Mmax ratio or MEP/Mmax at any level of maximal voluntary contraction (MVC). The RT group was significantly stronger than the NT group. Conclusions The study showed that the RT group was stronger than the NT group. Despite the difference in strength there was no significant group difference between the two groups in MEPs, V/Mmax or voluntary activation. This indicates that there is no, or a very small difference in corticospinal excitability of the soleus muscle between the chronic RT males and the NT males.
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Smith, J. "The role of haemodynamic stimulus in isometric exercise training : implications for cardiovascular adaptations." Thesis, Canterbury Christ Church University, 2014. http://create.canterbury.ac.uk/13758/.
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The purpose of this thesis was to explore the role of exercise induced blood flow haemodynamics in the cardiovascular adaptations associated with isometric exercise training, with focus on resting blood pressure adjustment in normotensive participants. Using a cross-sectional study, it was identified that significant relationships were present between (i) blood flow, (ii) shear stress, and (iii) shear pattern responses (measured in the femoral artery), during and immediately following isometric bilateral leg extension exercise of increasing intensity. Based on these findings, it was feasible to suggest that the haemodynamic response to high intensities of acute isometric exercise might provide a physiological challenge to the cardiovascular system, that upon repeated exposure via isometric exercise training, may induce cardiovascular adaptation and resting blood pressure reductions. Subsequent to this, a randomised controlled trial established that performing isometric exercise training to a ‘high haemodynamic stimulus’ did not induce significantly greater adaptation in resting blood pressure than when performing isometric exercise training to a ‘low haemodynamic stimulus’ or control. When the training group (high and low combined) were compared to the control, significant reductions in resting blood pressure were observed. Furthermore, non-invasive cardiovascular variables that were considered as possible physiological mechanisms for resting blood pressure adaptation following isometric exercise training did not correlate with within group resting blood pressure changes. Whilst these findings suggest that a haemodynamic challenge may not be the primary stimulus responsible for inducing resting blood pressure adaptation following isometric exercise training, these results do demonstrate the effectiveness of isometric exercise training for potential health gains via reductions in resting blood pressure in normotensives. Importantly, these findings have progressed the current understanding surrounding isometric exercise training induced resting blood pressure reductions and will allow future research to narrow their focus upon other physiological variables that may be the stimuli for blood pressure adaptation.
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Ruengrot, Pornrat. "Perfect isometry groups for blocks of finite groups." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/perfect-isometry-groups-for-blocks-of-finite-groups(092f1a9a-1583-4e8e-b285-a77c49e48765).html.
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Our aim is to investigate perfect isometry groups, which are invariants for blocks of finite groups. There are two subgoals. First is to study some properties of perfect isometry groups in general. We found that every perfect isometry has essentially a unique sign. This allowed us to show that, in many cases, a perfect isometry group contains a direct factor generated by -id. The second subgoal is to calculate perfect isometry groups for various blocks. Notable results include the perfect isometry groups for blocks with defect 1, abelian p-groups, extra special p-groups, and the principal 2-block of the Suzuki group Sz(q). In the case of blocks with defect 1, we also showed that every perfect isometry can be induced by a derived equivalence. With the help of a computer, we also calculated perfect isometry groups for some blocks of sporadic simple groups.Apart from perfect isometries, we also investigated self-isotypies in the special case where C_G(x) is a p-group whenever x is a p-element. We applied our result to calculate isotypies in cyclic p-groups and the principal 2-blocks of the Suzuki group Sz(q).
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Barry, Benjamin K. "The influence of resistance training upon movement control in older adults /." [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17249.pdf.
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Maganaris, Constantinos N. "In vivo mechanics of the human maximum isometric voluntary contraction : implications for musculoskeletal modelling." Thesis, Manchester Metropolitan University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267446.
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Chhatkuli, Ajad. "Local analytic and global convex methods for the 3D reconstruction of isometric deformable surfaces." Thesis, Clermont-Ferrand 1, 2016. http://www.theses.fr/2016CLF1MM27/document.
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Cette thèse contribue au problème de la reconstruction 3D pour les surfaces déformables avec une seule caméra. Afin de modéliser la déformation de la surface, nous considérons l’isométrie puisque de nombreuses déformations d’objets réels sont quasi-isométriques. L’isométrie implique que, lors de sa déformation, la surface ne peut pas être étirée ou compressée. Nous étudions deux problèmes. Le premier est le problème basé sur une modèle 3D de référence et une seule image. L’état de l’art propose une méthode locale et analytique de calcul direct de profondeur sous l’hypothèse d’isométrie. Dans cette méthode, la solution pour le gradient de la profondeur n’est pas utilisée. Nous prouvons que cette méthode s’avère instable lorsque la géométrie de la caméra tend à être affine. Nous fournissons des méthodes alternatives basées sur les solutions analytiques locales des quantités de premier ordre, telles que les gradients de profondeur ou les normales de la surface. Nos méthodes sont stables dans toutes les géométries de projection. Dans le deuxième type de problème de reconstruction sans modèle 3D de référence, on obtient les formes de l’objet à partir d’un ensemble d’images où il apparaît déformé. Nous fournissons des solutions locales et globales basées sur le modéle de la caméra perspective. Dans la méthode locale ou par point, nous résolvons pour la normale de la surface en chaque point en supposant que la surface est infinitésimalement plane. Nous calculons ensuite la surface par intégration. Dans la méthode globale, nous trouvons une relaxation convexe du problème. Celle-ci est basée sur la relaxation de l’isométrie en contrainte d’inextensibilité et sur la maximisation de la profondeur en chaque point de la surface. Cette solution combine toutes les contraintes en un seul programme d’optimisation convexe qui calcule la profondeur et utilise une représentation éparse de la surface. Nous détaillons les expériences approfondies qui ont été réalisées pour démontrer l’efficacité de chacune des méthodes. Les expériences montrent que notre solution libre de modèle de référence local fonctionne mieux que la plupart des méthodes précédentes. Notre méthode local avec un modèle 3D de référence et notre méthode globale sans modèle 3D apportent de meilleurs résultats que les méthodes de l’état de l’art en étant robuste au bruit de la correspondance. En particulier, nous sommes en mesure de reconstruire des déformations complexes, non-lisses et d’articulations avec la seconde méthode; alors qu’avec la première, nous pouvons reconstruire avec précision de déformations larges à partir d’images prises avec des très longues focales<br>This thesis contributes to the problem of 3D reconstruction for deformable surfaces using a single camera. In order to model surface deformation, we use the isometric prior because many real object deformations are near-isometric. Isometry implies that the surface cannot stretch or compress. We tackle two different problems. The first is called Shape-from-Template where the object’s deformed shape is computed from a single image and a texture-mapped 3D template of the object surface. Previous methods propose a differential model of the problem and compute the local analytic solutions. In the methods the solution related to the depth-gradient is discarded and only the depth solution is used. We demonstrate that the depth solution lacks stability as the projection geometry tends to affine. We provide alternative methods based on the local analytic solutions of first-order quantities, such as the depth-gradient or surface normals. Our methods are stable in all projection geometries. The second type of problem, called Non-Rigid Shape-from-Motion is the more general templatefree reconstruction scenario. In this case one obtains the object’s shapes from a set of images where it appears deformed. We contribute to this problem for both local and global solutions using the perspective camera. In the local or point-wise method, we solve for the surface normal at each point assuming infinitesimal planarity of the surface. We then compute the surface by integration. In the global method we find a convex relaxation of the problem. This is based on relaxing isometry to inextensibility and maximizing the surface’s average depth. This solution combines all constraints into a single convex optimization program to compute depth and works for a sparse point representation of the surface. We detail the extensive experiments that were used to demonstrate the effectiveness of each of the proposed methods. The experiments show that our local template-free solution performs better than most of the previous methods. Our local template-based method and our global template-free method performs better than the state-of-the-art methods with robustness to correspondence noise. In particular, we are able to reconstruct difficult, non-smooth and articulating deformations with the latter; while with the former we can accurately reconstruct large deformations with images taken at very long focal lengths
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Camus, Thomas. "Méthodes algorithmiques pour les réseaux algébriques." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAM033/document.
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Les travaux présentés dans ce mémoire concernent les réseaux, qui sont des objets mathématiques fondamentaux pour de nombreux domaines tel que théorie des nombres et la cryptographie.Nous proposons dans un premier temps une généralisation et une implantation de l'algorithme de réduction de Lenstra, Lenstra et Lov'asz (algorithme LLL) dans le cadre algébrique simple des réseaux sur les anneaux d'entiers quadratiques, imaginaires et euclidiens.Nous nous attachons ensuite à présenter les notions de réseaux algébriques et de formes de Humbert, qui sont des généralisations dans un cadre algébrique aussi large que possible des notions classiques de réseaux euclidiens et de formes quadratiques. L'introduction de ces objets nous permet de présenter une adaptation et une implantation de l'algorithme de Plesken et Souvignier permettant de traiter efficacement les problèmes de l'isométrie et de la détermination des automorphismes pour les réseaux algébriques.Nous proposons finalement une étude détaillée de la complexité de ces deux problèmes. Nous montrons notamment qu'ils sont intiment reliés à des problèmes similaires sur les graphes. Cette réduction nous permet d'exhiber des bornes de complexité inédites<br>This thesis deals with lattices, which are fundamental objects in many fields, such as number theory and cryptography.As a first step, we propose a generalization and an implantation of the Lenstra, Lenstra and Lov'asz algorithm (LLL algorithm) in the simple algebraic setting of lattices over quadratic imaginary and euclidean ring of integers.Then, we present the notions of algebraic lattices and Humbert forms, which are extensions of euclidean lattices and quadratic forms in a large algebraic setting. Introducing these objects leads us to develop and implant modifications of the Plesken and Souvignier algorithm. This algorithm efficiently solves the isometric lattices problem and the automorphism group computation problem for algebraic lattices.Eventually, we analyze in depth the complexity of this two algorithmic problems. We show that they are intimately related to similar problems on graphs. This reduction leads us to express unprecedented complexity bounds
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Galvão, Daniel Abido. "Resistance exercise in men receiving androgen deprivation therapy for prostate cancer." Connect to thesis, 2006. http://portal.ecu.edu.au/adt-public/adt-ECU2006.0046.html.
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Terpstra, Brian T. "Age and gender related differences in skeletal muscle adaptations to twelve weeks of progressive resistance training." Virtual Press, 2001. http://liblink.bsu.edu/uhtbin/catkey/1217387.
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Diabetic patients are prone to complications and need foot care education. The purposes of this study were to (1) examine the effectiveness of instruction on knowledge of foot care in diabetics, and practice of foot care in diabetics, and (2) examine the relationship between health promoting behaviors and foot care practices. The theoretical framework for this study was Nola Pender's Health Promotion Model. The sample for the study consisted of 69 individuals, ages 18 and older with diabetes mellitus (Type I or Type II).Control and experimental groups completed a demographic sheet and Pender's Health Promoting Lifestyle Profile. The control group received the traditional intervention of a written handout (Novo Nordisk Pharmaceuticals, Inc.) and a packet including an emery board, moisturizing lotion, and a hand-held mirror. The experimental group received a specialized nursing intervention of one-on-one instruction along with a written handout, and a packet including an emery board, moisturizing lotion, and a handheld mirror. Both groups were informed of a $10.00 stipend obtainable and paid by the researcher, for those who completed the study. Two weeks following the office visit, both groups received by mail: a follow-up letter, post-tests on knowledge (Knowledge Questionnaire) and practice (Practice Profile), and a stamped return envelope.There was a significant difference between the control group and the experimental group in knowledge of foot care. There was no significant difference between the control group and the experimental group in practices of foot care. There was a significant, positive correlation (r=.306, p=.012) between the practices of health promoting behaviors and foot care practices. Also, educational level was positively correlated (r=.432, p=.001) with knowledge of foot care.Several studies have been done on diabetic foot care instruction but few have been done to compare different methods of instruction with foot care knowledge and practice. One-on-one education provides an opportunity for the learner to play an active role in the discussion of alternative methods of foot care while allowing for immediate feedback from the nurse educator. Packets that include a well-written instruction sheet and foot care items for patient use can be helpful when educating patients about foot care.<br>School of Physical Education
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Kostek, Matthew Christopher. "Effects of low level resistance training on basal metabolism in currently active older men." Virtual Press, 1999. http://liblink.bsu.edu/uhtbin/catkey/1129633.
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The American College of Sports Medicine (ACSM) currently recommends 1 set of 8 - 12 repetitions as the minimal dose of resistance training (RT) required to achieve the health and fitness benefits gained from RT. Yet, certain benefits derived from resistance training are not mentioned by the ACSM. An increase in basal metabolic rate (BMR) is a possible health benefit derived from RT. However, no previous studies have examined the effect of the ACSM's current resistance training recommendations on BMR. Therefore, the purpose of this study was to determine if this low level of RT could increase BMR in currently active older men. Sixteen subjects were assigned to either a training group or control group for 10 weeks of training. The training group continued their current aerobic activity while adding 1 set of RT 2x/week as recommended by the ACSM. The control group continued their aerobic activity with no modifications. Measurements of strength, fat free mass (FFM), and BMR were made pre- and posttraining. The training group showed an increase in strength (P<0.05) while the control group did not change. The training and control groups showed no change in FFM or BMR (P<0.05). The strength increases reported in the current study were of expected values while FFM and BMR have not been previously examined with this protocol. It was concluded that 10 weeks of RT using 1 set of 8 - 12 repetitions does not increase BMR in currently active older men.<br>School of Physical Education
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Wagner, Holly A. "Determining optimal load for a constant-load cycle ergometer test relative to isotonic leg strength." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-01242009-063426/.
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Kok, Lian-Yee. "Comparing linear and undulating periodisation for improving and maintaining muscular strength qualities in women." University of Western Australia. School of Human Movement and Exercise Science, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0077.
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[Truncated abstract] Resistance training is increasingly popular for improving strength qualities such as hypertrophy, maximal strength, endurance and power. Although many resistancetraining programmes now adhere to the concept of periodisation, the number of studies examining its structure and design are few, and there are just a handful of studies that have examined periodised training for the maintenance of strength and power. Even rarer, are periodised resistance-training studies that utilise female subjects. Previous studies have compared non-periodised training regimens such as Progressive Resistance Exercise (PRE), and the two main models of periodisation, Linear Periodisation (LP) and Undulating Periodisation (UP). Results are inconclusive as to whether the efficacy of the periodised training programmes were due to the manipulation of training variables such as volume and intensity, or that training programmes with higher doses of volume induced better training responses. However, to make effective comparisons between training programmes, the training volume or workload (total load lifted x total repetitions) and training intensity have to be equated between the groups under examination. While the intensities (percentage of one-repetition maximum, 1 RM) for improving strength qualities such as hypertrophy and maximal strength have general consensus among resistance-training practitioners, there exists disagreement over the intensity that should be used during the training of power. Thus, it is important to first identify the load for power training before comparisons can be made between LP and UP programmes using equal training volumes. ... The final study found that adhering to two UP maintenance training programmes with equalised volumes and intensities twice a week increased upper-body strength and maintained lower-body strength adequately across a 3-wk phase. The results from these studies support previous results that suggest training programmes with higher workloads and repetitions produce superior strength and power adaptations, and it is not specifically the variation of training volume and intensity within a periodised programme that improves strength qualities. Thus, both periodised programmes used in this thesis can be recommended for untrained and moderatelytrained women as both LP and UP were found to be similarly effective for increasing upper- and lower-body hypertrophy, strength and power.
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De, Youngster Dela. "An Isometry-Invariant Spectral Approach for Macro-Molecular Docking." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/30226.
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Proteins and the formation of large protein complexes are essential parts of living organisms. Proteins are present in all aspects of life processes, performing a multitude of various functions ranging from being structural components of cells, to facilitating the passage of certain molecules between various regions of cells. The 'protein docking problem' refers to the computational method of predicting the appropriate matching pair of a protein (receptor) with respect to another protein (ligand), when attempting to bind to one another to form a stable complex.
Research shows that matching the three-dimensional (3D) geometric structures of candidate proteins plays a key role in determining a so-called docking pair, which is one of the key aspects of the Computer Aided Drug Design process. However, the active sites which are responsible for binding do not always present a rigid-body shape matching problem. Rather, they may undergo sufficient deformation when docking occurs, which complicates the problem of finding a match.
To address this issue, we present an isometry-invariant and topologically robust partial shape matching method for finding complementary protein binding sites, which we call the ProtoDock algorithm. The ProtoDock algorithm comes in two variations. The first version performs a partial shape complementarity matching by initially segmenting the underlying protein object mesh into smaller portions using a spectral mesh segmentation approach. The Heat Kernel Signature (HKS), the underlying basis of our shape descriptor, is subsequently computed for the obtained segments. A final descriptor vector is constructed from the Heat Kernel Signatures and used as the basis for the segment matching. The three different descriptor methods employed are, the accepted Bag of Features (BoF) technique, and our two novel approaches, Closest Medoid Set (CMS) and Medoid Set Average (MSA).
The second variation of our ProtoDock algorithm aims to perform the partial matching by utilizing the pointwise HKS descriptors. The use of the pointwise HKS is mainly motivated by the suggestion that, at adequate times, the Heat Kernel Signature of a point on a surface sufficiently describes its neighbourhood. Hence, the HKS of a point may serve as the representative descriptor of its given region of which it forms a part. We propose three (3) sampling methods---Uniform, Random, and Segment-based Random sampling---for selecting these points for the partial matching. Random and Segment-based Random sampling both prove superior to the Uniform sampling method.
Our experimental results, run against the Protein-Protein Benchmark 4.0, demonstrate the viability of our approach, in that, it successfully returns known binding segments for known pairing proteins. Furthermore, our ProtoDock-1 algorithm still still yields good results for low resolution protein meshes. This results in even faster processing and matching times with sufficiently reduced computational requirements when obtaining the HKS.
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Ekman, Matilda. "The development of a novel sport specific isometric strength measurement for para kayak classification : A reliability study." Thesis, Gymnastik- och idrottshögskolan, GIH, Institutionen för fysisk aktivitet och hälsa, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-6776.
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To the author’s knowledge, no research has earlier been done on the development of a sport specific strength measurement system for para kayak classification.Aim: In order to work in line with the International Paralympic Committee, to develop more evidence-based methods for classification, the overall purpose of this study was to design and develop a sport specific test battery to measure force in isometric contractions. It was also: (1) to test-retest the battery on able-bodied participants, to ensure the reliability of the method for further research and (2) to evaluate whether performing two or three trials is sufficient when testing the test battery for reliability. Method: Ten able-bodied participants volunteered to this study. All participants performed a test battery of four isometric strength tests. The participants completed three voluntary maximal isometric contractions for each exercise with a duration of 5 seconds, and a 30 second rest separating each trial. Data used in the analysis, was the mean value of two respectively three trials. The Shapiro-Wilk test of normality was used to assess the normality of the data. The level of significance when testing normality was set to p < 0.05. A dependent t-test and an intraclass correlations coefficient (ICC) with a 2-way mixed effects- model, absolute agreement, method 3.1 were used to assess the test-retest reliability for both trial 1-2 and trial 1-3. Results: All tests showed high reliability and no systematic error were found. The data were normally distributed. When analysing data from three trials, one test showed good reliability; knee extension left (ICC=0,77). All other data showed excellent reliability. When analysing data from two trials, two tests showed good reliability; leg press left (ICC = 0,88) and knee extension left (ICC = 0,78). All other data showed excellent reliability (> 90). Conclusion: The results of this study indicate that all tests can reliably be applied in a classification system for para-kayak. Both of the methods, using three data points and using two data points, can be used when analysing the data.
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Harper, Bradley M. Gordon Scott Edward. "5'-AMP-activated protein kinase and eukaryotic elongation factor 2 response to resistance exercise in young versus old men and women." [Greenville, N.C.] : East Carolina University, 2009. http://hdl.handle.net/10342/1891.
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Thesis (M.S.)--East Carolina University, 2009.<br>Presented to the faculty of the Department of Exercise and Sport Science. Advisor: Scott E. Gordon. Title from PDF t.p. (viewed May 4, 2010). Includes bibliographical references.
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Anaya, Bob. "Fuchsian Groups." CSUSB ScholarWorks, 2019. https://scholarworks.lib.csusb.edu/etd/838.
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Fuchsian groups are discrete subgroups of isometries of the hyperbolic plane. This thesis will primarily work with the upper half-plane model, though we will provide an example in the disk model. We will define Fuchsian groups and examine their properties geometrically and algebraically. We will also discuss the relationships between fundamental regions, Dirichlet regions and Ford regions. The goal is to see how a Ford region can be constructed with isometric circles.
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Weinheimer, Eileen M. "The effect of acute resistance exercise on the expression of the COX-1 variants and COX-2 in human skeletal muscle : implicaitons [sic] for protein synthesis." Virtual Press, 2006. http://liblink.bsu.edu/uhtbin/catkey/1339598.
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Cyclooxygenase (COX) is the enzyme that catalyzes the rate-limiting step in prostaglandin (PG) synthesis. In skeletal muscle, PGF2a, has been shown to regulate protein synthesis, and ibuprofen and acetaminophen have been shown to block the normal increase in PGF2a and muscle protein synthesis following resistance exercise in humans. The purpose of this investigation was to determine the expression of the COX-1 (COX-1 variants: COX-1 v1, -1v2, -1 b,, -1 b2, and -1b3) and COX-2 isoforms following resistance exercise to help elucidate the isoform or variant through which PGF2a, ibuprofen, and acetaminophen regulate muscle protein synthesis. Human skeletal muscle biopsy samples were taken from 16 individuals (8M, 8F) before, 4 h, and 24 h following a single bout of resistance exercise and analyzed using real-time RT-PCR. COX-Iv1 and COX-1v2 were the most abundant COX mRNA before exercise and remained unchanged (P>0.05) following exercise (i.e., constitutively expressed). Relatively few individuals expressed the intron 1-retaining COX-1 b variants (COX-1 b,, - 1b2, and -1 b3) at any time point, and when expressed these variants were in very low abundance. COX-2 was not expressed in any subject before exercise, but increased significantly (P<0.05) at 4 and 24 h following exercise. These results suggest that the intron 1-retaining COX-1 b,, -1 b2, and -lb3 variants are likely not the COX through which PGF2a is produced to stimulate skeletal muscle protein synthesis. PGF2a, stimulation, as well as ibuprofen and acetaminophen inhibition of skeletal muscle protein synthesis likely work through COX-2, or one of the constitutively expressed COX-1 variants (COX-lv1 or -1v2).<br>School of Physical Education, Sport, and Exercise Science
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Everard, Kevin [Verfasser], and Jörg [Akademischer Betreuer] Eschmeier. "A Toeplitz projection for multivariable isometries / Kevin Everard. Betreuer: Jörg Eschmeier." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2013. http://d-nb.info/1053681933/34.
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Sutherland, Rona. "An investigation of a novel, non-invasive technique for the assessment of oxidative stress in aerobic and isometric exercise." Thesis, University of Glasgow, 2011. http://theses.gla.ac.uk/2652/.
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The oxidative stress response to exercise is a well-established phenomenon; however, the time course of this response has not been well characterised. There is little information in the literature regarding the oxidative stress response during exercise; most authors have measured oxidative stress solely during the recovery period from exercise. There are several different invasive methods available for assessment of oxidative stress, although there is no “gold standard” technique. A novel non-invasive technique utilising laser spectroscopy to quantify expired ethane concentration has become available, but has not yet been tested in relation to exercise. The first study described here aimed to use the laser spectroscopy technique for the first time to assess exercise-induced oxidative stress in three species: humans, horses and dogs; and to determine the utility of carbon monoxide monitoring as a means of assessment of oxidative stress. A further objective was to better characterise the oxidative stress response by the collection of data at frequent intervals during exercise and during recovery. Eight endurance-trained males performed incremental treadmill exercise to volitional exhaustion. Twelve racehorses and twelve racing greyhounds performed maximal exercise on a race track. Expired ethane concentration was measured throughout exercise in humans, and pre- and post-exercise in horses and dogs. Carbon monoxide concentration was assessed pre- and post-exercise in all species. Results indicated that the technique of laser spectroscopy was viable for use in relation to exercise in all three species. Oxidative stress was shown to increase significantly following exercise in all three species, thus supporting previous literature, and extending this finding to a trained human population for the first time. The pattern of response during incremental treadmill exercise was characterised for the first time and indicated a non-significant increase in oxidative stress in humans within 2 minutes of the onset of exercise, with the response progressively increasing alongside increases in work rate until exercise was terminated at exhaustion. The response returned close to the resting value by 20 minutes into the recovery period. Low subject number may have contributed to the lack of significant findings during exercise. Carbon monoxide was not a useful indicator of oxidative stress in any species. Increased functionality of the laser spectroscopy technique was investigated by pilot work in which real-time monitoring of expired ethane was attempted for the first time in relation to exercise. This allowed the observation of the oxidative stress response on a breath by breath basis. Initial tests, in which two healthy males performed incremental cycle ergometer exercise to exhaustion whilst breathing through a valve connected directly to the spectrometer, indicated that a useful output could be recorded during a prolonged period of exercise. However, the measurement of ambient ethane concentration, essential for accuracy, was not undertaken in the initial tests. Thus, further pilot work was successfully carried out in three healthy males to replicate the initial tests with concurrent ambient ethane monitoring. This pilot testing allowed development of data editing techniques. The oxidative stress response profile for incremental exercise in real-time was similar to that reported in the previous chapter. Additional tests were undertaken which illustrated that the rise in ethane output observed during incremental exercise was not simply a manifestation of the ventilatory response to exercise, rather than an indication of exercise-induced oxidative stress. This was accomplished by forcing an increase in ventilation, by imposition of an additional dead space volume during normal breathing in two individuals. This technique shows promise for more detailed characterisation of the time course of the oxidative stress response in future exercise studies via the capability for extremely high density data collection. The main aims of the second study were to investigate the oxidative stress response throughout the entire work rate range from rest to volitional exhaustion, rather than just the higher end of the work rate range as observed in study one; and to examine the magnitude and time course of the oxidative stress response to constant load exercise performed below and above the lactate threshold. Six healthy males performed incremental cycle ergometer exercise to exhaustion during which blood samples were collected regularly for later analysis for the presence of F2-isoprostanes. Results of the analysis were disappointing, with a high proportion of samples displaying a concentration outwith the range of the assay. However, preliminary malondialdehyde analysis suggested that the oxidative stress response may increase progressively alongside work rate throughout the entire work rate range. However, this observation is far from conclusive as it is based on data from a single subject only. The final study was intended to investigate the effect of contraction intensity on the oxidative stress response to isometric handgrip exercise sustained to exhaustion, and to clarify the time course of the oxidative stress response during the recovery period. Due to logistical limitations, it was possible to study one contraction intensity only. Initially, pilot work was undertaken to determine the suitability of the novel non-invasive technique for ethane assessment in relation to isometric exercise, since this assessment method had not been used previously with this exercise mode. Then, six healthy males performed sustained isometric exercise at 60 % of maximal voluntary contraction until fatigue. Oxidative stress was assessed during a 30 minute recovery period via expired ethane and also via F2-isoprostanes concentration in blood collected from both the exercised arm and the non-exercised arm. This was intended to allow comparison of blood sampling site, and of the systemic oxidative stress response measured both invasively and non-invasively; however this was not possible due to poor assay results. The previous finding of a peak oxidative stress response following isometric exercise within the first 5 minutes of the recovery period was supported. Oxidative stress was assessed by ethane output for the first time in relation to isometric exercise and was found to be a viable technique; however, its use remains to be validated against more traditional plasma markers. The potential value of non-invasive assessment was underlined by F2-isoprostanes analysis issues. In conclusion, the use of laser spectroscopy, including the use of real-time monitoring, appears to be a viable technique for the non-invasive assessment of exercise-induced oxidative stress, and may enhance our ability to characterise this response in future studies.
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Herold, Johannes L. [Verfasser], and Hans Georg [Akademischer Betreuer] Bock. "Mathematical modeling, simulation, and optimization of loading schemes for isometric resistance training / Johannes L. Herold ; Betreuer: Hans Georg Bock." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/123128045X/34.
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Hornsby, W. Guy, G. Gregory Haff, William A. Sands, Michael W. Ramsey, George K. Beckham, and Michael H. Stone. "Alterations in Strength Characteristics for Isometric and Dynamic Mid-Thigh Pulls in Collegiate Throwers Across 11 Weeks of Training." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etsu-works/4618.
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Aim: The purpose of this study was: 1) to investigate the alterations and relationships among training variables, performance variables, and physiological variables and 2) investigate the effects of strength training on potentiation complexes.
Methods: The study enrolled nine D-1 collegiate throwers and four control subjects. The throwers participated in an 11-week resistance training and throws program. Resistance training volume load and throwing volume were recorded for 11 weeks. Measurements of maximal strength (isometric mid-thigh pulls) and dynamic mid-thigh pulls (DMTP) across a spectrum of loads: Males- 60kg, 140kg, 180kg, 220kg, 140kg, 30% isometric peak force (IPF), Females- 60kg, 80kg, 100kg, 120kg, 80kg, 30% IPF), were measured at weeks 1, 7, and 11. The control group was tested for isometric maximum strength at T1 (week 1) and T3 (week 11)
Results: The throwers increased at each time point in isometric peak force (IPF), allometrically scaled IPF (IPFa), and isometric impulse. The throwers strength (IPF and IPFa) was significantly greater than the controls and the throwers experienced statistically significant changes in maximum strength from T1 to T3 when compared to the controls. The throwers demonstrated statistically significant changes in total load variables (variable for load 1+ load 2 + load 3 etc.) for DMTPs.
Conclusion: As a whole these data suggest a potential for increased performance capabilities specific to throwing. Some data trends indicate that potentiation can occur as a result of performing a heavy pull before a lighter one. However, increasing maximum strength as a result of focusing on strength training did not enhance this potentiation effect.
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Shepherd, J. "Factors affecting perceived exertion and task duration during intermittent isometric fatiguing exercise and their implications for rehabilitation following knee surgery." Thesis, Nottingham Trent University, 2012. http://irep.ntu.ac.uk/id/eprint/132/.
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It has been theorised that self-perception is integral to the regulation of exercise and production of an optimal performance. This concept has not been examined in an anterior cruciate ligament (ACL) reconstructed population where the consequences of injury and surgery may provide a substantive perturbation to perceptual capabilities. Ratings of perceived exertion (RPE) have previously been shown to enable prediction of exercise task duration (TD) during running and cycling activities in healthy individuals, but this has yet to be explored in intermittent and isolated muscle exercise that is typically utilised during resistance training and ACL rehabilitation. Accordingly, this thesis investigated: i) the relationship between self-perceived knee function and objective measures of musculoskeletal performance at a range of time-points across the ACL-rehabilitation period; ii) the relationship between two paradigms of self-perception (RPE; perceived TD) and TD in healthy individuals during an intermittent isometric fatigue task (IIF) under various conditions of increasing exercise stress. Self-perceived knee function measured via subjective rating scales was only moderately correlated with objective performance towards the latter stages of the rehabilitation period, highlighting a disparity between perceived and actual capabilities during the early to intermediate stages of recovery (pre-surgery to 24 weeks). In contrast to previous research in running and cycling exercise, the investigation of self-perception and TD during an IIF revealed evidence of both linear and curvilinear trends in perceptual response. Linear trends were observed at exercise intensities of 60% to 80% of baseline volitional peak force, whilst curvilinear patterns of response were apparent at intensities of 60% peak force, and under conditions of exercise-induce muscle damage. Evidence of a negatively accelerating curvilinear response may reflect an underestimation of performance, and questions the utility of self-perception to predict TD in isolated muscle exercise. These combined findings highlight a need for further research before confirming the efficacy of self-perception with regard to regulating exercise during rehabilitative-type activities.
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Taylor, Matthew. "Investigation and Quantification of FES Exercise – Isometric Electromechanics and Perceptions of Its Usage as an Exercise Modality for Various Populations." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/20435.
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Functional Electrical Stimulation (FES) is the triggering of muscle contraction by use of an electrical current. It can be used to give paralyzed individuals several health benefits, through allowing artificial movement and exercise. Although many FES devices exist, many aspects require innovation to increase usability and home translation. In addition, the effect of changing electrical parameters on limb biomechanics is not entirely understood; in particular with regards to stimulation duty cycle. This thesis has two distinct components. In the first (public health component), interview studies were conducted to understand several issues related to FES technology enhancement, implementation and home translation. In the second (computational biomechanics component), novel signal processing algorithms were designed that can be used to measure mechanical responses of muscles subjected to electrical stimulation. These experiments were performed by changing duty cycle and measuring its effect on quadriceps-generated knee torque. The studies of this thesis have presented several ideas, toolkits and results which have the potential to guide future FES biomechanics studies and the translatability of systems into regular usage for patients. The public health studies have provided conceptual frameworks upon which FES may be used in the home by patients. In addition, they have elucidated a range of issues that need to be addressed should FES technology reach its true potential as a therapy. The computational biomechanics studies have put forward novel data analysis techniques which may be used for understanding how muscle responds to electrical stimulation, as measured via torque. Furthermore, the effect of changing the electrical stimulation duty cycle on torque was successfully described, adding to an understanding of how electrical stimulation parameter modulation can influence joint biomechanics.
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Scott, Stephen Bryce. "An ergonomic analysis of commercially available exercise equipment : implications for resistance training and clinical rehabilitation." Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1016367.
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This study examined the often contrived advertising claims of the manufacturers of variable resistance isotonic machinery. Specifically, the study sought to ascertain whether certain equipment was compatible with musculo-skeletal and perceptual needs and limitations of the human user: that is, to determine whether presently installed eccentric cams, which provide the variable resistance, matched the users force curves. The format of this research was in the ergonomic tradition in which empirical research is not necessarily the primary avenue. Consequently the inter-disciplinary nature of ergonomics required small-scale laboratory- simulation experiments to be conducted in a diverse range of disciplines such as physiology, psychology and biomechanics. It was found that on all five pieces of variable resistance machinery analysed, a mismatch between the force curves and the eccentric cams exist. The cams were redesigned accordingly. The metabolic cost of performing fixed-rate isoinertial lifts was moderate. The psychophysical analysis revealed that perceptual responses indicated that the work was classified as 'light' and only at 30% stress levels do local cues begin to dominate. Based on these findings it was concluded that manufacturers advertising claims in the instances analysed were not well-founded and that variable resistance isotonic machinery should only be used to develop muscular strength and endurance, and do not effectively serve as weight-loss devices.
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Schmitzer, Bernhard [Verfasser], and Christoph [Akademischer Betreuer] Schnörr. "Isometry Invariant Shape Priors for Variational Image Segmentation / Bernhard Schmitzer ; Betreuer: Christoph Schnörr." Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/1180031431/34.
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Budnar, Jr Ronald G. "The Effect of Post-exercise Ethanol Consumption on the Acute Hormonal Response to Heavy Resistance Exercise in Women." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc822770/.
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The purpose of this study was to examine the hormonal response to acute ethanol ingestion following a bout of heavy resistance exercise in women. Eight resistance trained women completed two identical acute heavy resistance exercise tasks (AHRET). From 10-20 minutes post-AHRET, participants consumed either a grain ethanol or a placebo beverage. Blood was collected before (PRE) and immediately after the AHRET (IP) and then every 20 minutes for five hours. Blood collected after beverage ingestion was pooled into 3 batches (phases: 20-40 minutes, 60-120 minutes, and 140-300 minutes post-exercise) and analyzed for serum total testosterone (TT), free testosterone (FT), insulin-like growth factor-I (IGF-I), human growth hormone (GH), cortisol (COR), and estradiol (E2) concentrations. Circulating concentrations of TT were significantly greater at P20-40 than at PRE, P60-120, and P140-300. Circulating concentrations of FT were significantly greater at P20-40 than at all other times. Circulating concentrations of GH were significantly greater at IP than at PRE, P60-120, and P140-300. Circulating concentrations of COR were significantly greater at P20-40 than at all other times. Additionally, COR concentrations at P140-300 were significantly lower than at all other times. Circulating concentrations of IGF-1 were significantly greater at P20-40 than at P60-120 and P140-300. Circulating concentrations of E2 were significantly greater at P20-40 than at all other times. In summary, the present study demonstrated an acute modulation of the neuroendocrine milieu following a heavy resistance exercise bout in women. Ethanol ingestion appeared to have no significant effect on the characteristics of acute hormonal augmentation in TT, FT, GH, COR, IGF-1, or E2.
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Han, Shaojie. "Evidence for Absence of Latchbridge Formation in Phasic Saphenous Artery." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/948.
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Tonic arterial smooth muscle can produce strong contractions indefinitely by formation of slowly cycling crossbridges (latchbridges) that maintain force at a high energy economy. To fully understand the uniqueness of mechanisms regulating tonic arterial contraction, comparisons have been made to phasic visceral smooth muscles that do not sustain high forces. This study explored mechanisms of force maintenance in a phasic artery by comparing KCl-induced contractions in the tonic, femoral artery (FA) and its primary branch, the phasic saphenous artery (SA). KCl rapidly (5 N/m2) and [ca2+]i (250 nM) in FA and SA. By 10 min, [ca2+]i declined to 175 nM in both tissues but stress was sustained in FA (1.3 x 105N/m2) and reduced by 40% in SA (0.8 x l05 N/m2). Reduced tonic stress correlated with reduced myosin light chain (MLC) phosphorylation in SA (28% vs. 42% in FA). SA expressed more MLC phosphatase than FA, and permeabilized (β-escin) SA relaxed more rapidly than FA in the presence of MLC kinase blockade, suggesting that MLC phosphatase activity in SA was greater than that in FA. The reduction in MLC phosphorylation in SA was insufficient to account for reduced tonic force (latchbridge model), and SA expressed more "fast" myosin isoforms than did FA. Cytochalasin-D reduced force-maintenance more in FA than SA. These data support the hypothesis that strong force-maintenance is absent in SA because expressed motor proteins do not support latchbridge formation, and because actin polymerization is not stimulated.
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Harper, Tisha Adele Maria. "A Biomechanical Cadaver Study to Determine the Effectiveness of the Lateral Graft Technique and Isometric Suture Placement for Extracapsular Stabilization of the Cranial Cruciate Ligament Deficient Stifle in the Dog." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/32046.
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Objective â 1) To determine whether a graft of fascia lata and part of the patellar ligament, used in an extracapsular fashion from the tibial crest to the femorofabellar ligament, would eliminate abnormal cranial drawer motion in the cranial cruciate ligament (CrCL) deficient stifle 2) To determine if two new tibial suture anchor points would enhance biomechanical function of the lateral fabellar-tibial suture (FTS).
Study Design â Experimental.
Animals â 28 canine cadaver hind limbs.
Methods â Stifles were mounted in a jig that allowed tibial rotation during loading and were tested between loads of â 65 to 80 N in caudal and cranial drawer respectively. Stifles were tested with the CrCL intact followed by one of four stabilization techniques after CrCL transection: lateral graft technique (LGT) and three FTS with different tibial anchor points.
Results â Differences in cranial drawer motion (displacement) and stiffness between the LGT and standard FTS were not significant in two data sets, when compared to the intact CrCL. The FTS with the anchor point in the tibial crest showed the least displacement of all stabilization methods. Differences in stiffness were not significant between the stabilization techniques.
Conclusions â Stability provided by the LGT is comparable to that of the standard FTS for the CrCL-deficient stifle in the cadaver. Altering the tibial anchor points for the FTS did not improve stiffness or result in a further decrease in cranial drawer motion.
Clinical Relevance â The LGT could be used for the treatment of acute and chronic CrCL ruptures in the dog. A clinical study is recommended.<br>Master of Science
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Gonçalves, Ana Clara Campagnolo Real. "Exercício resistido em cardiopatas : revisão sistemática da literatura e análise do comportamento autonômico em recuperação pós-exercício resistido aplicado de forma aguda /." Presidente Prudente : [s.n.], 2010. http://hdl.handle.net/11449/87292.
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Orientador: Luiz Carlos Marques Vanderlei<br>Banca: Carlos Marcelo Pastre<br>Banca: Francis da Silva Lopes<br>Resumo: A perda de massa muscular secundária à idade e à inatividade física é clinicamente relevante na população cardíaca, contudo a prescrição do exercício resistido dinâmico para esses pacientes apresenta-se inconclusiva na literatura. Objetivo: Reunir informações sobre a especificidade dos componentes do treinamento resistido prescrito à população cardiopata. Metodologia: Foi realizada busca sistemática de literatura, a partir das bases de dados LILACS, SciELO e PubMed, utilizando os seguintes descritores na língua portuguesa: força muscular, exercício isométrico, esforço físico, cardiopatia e coronariopatia, e seus correspondentes na língua inglesa (muscle strength, isometric exercise, physical effort, heart disease e artery coronary disease), os quais foram ... (Resumo completo, clicar acesso eletrônico abaixo)<br>Abstract: Loss of muscle mass secondary to age and physical inactivity is clinically relevant in cardiac population, however dynamic resistance exercise prescription to these patients presents inconclusive in literature. Objective: Adjoin information about specific components of resistance exercise prescribed to cardiac population. Methodology: Systematic search was performed, using the data bases LILACS, SciELO and PubMed. The descriptors used were: muscle strength, isometric exercise, physical effort, heart disease and artery coronary disease, which were surveyed separately and combined, considering for this review articles that ... (Complete abstract click electronic access below)<br>Mestre
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Cooper, Haydn. "Two generator discrete groups of isometries and their representation : a thesis presented in partial fulfillment of the requirements for the degree of Master of Science in Mathematics at Massey University, Albany, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/973.
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Let M Φ and Mψ be elements of PSL(2,C) representing orientation preserving isometries on the upper half-space model of hyperbolic 3-space Φ and ψ respectively. The parameters β = tr2(M Φ) - 4, β1 = tr2(Mψ) - 4, γ = tr[M Φ,Mψ] - 2, determine the discrete group (Φ ,ψ) uniquely up to conjugacy whenever γ ≠ 0. This thesis is concerned with explicitly lifting this parameterisation of (Φ , ψ) to PSO(1, 3) realised as a discrete 2 generator subgroup of orientation preserving isometries on the hyperboloid model of hyperbolic 3-space. We particularly focus on the case where both Φ and ψ are elliptic.
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Bird, Gregory David. "Linear and Nonlinear Dimensionality-Reduction-Based Surrogate Models for Real-Time Design Space Exploration of Structural Responses." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8653.
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Design space exploration (DSE) is a tool used to evaluate and compare designs as part of the design selection process. While evaluating every possible design in a design space is infeasible, understanding design behavior and response throughout the design space may be accomplished by evaluating a subset of designs and interpolating between them using surrogate models. Surrogate modeling is a technique that uses low-cost calculations to approximate the outcome of more computationally expensive calculations or analyses, such as finite element analysis (FEA). While surrogates make quick predictions, accuracy is not guaranteed and must be considered. This research addressed the need to improve the accuracy of surrogate predictions in order to improve DSE of structural responses. This was accomplished by performing comparative analyses of linear and nonlinear dimensionality-reduction-based radial basis function (RBF) surrogate models for emulating various FEA nodal results. A total of four dimensionality reduction methods were investigated, namely principal component analysis (PCA), kernel principal component analysis (KPCA), isometric feature mapping (ISOMAP), and locally linear embedding (LLE). These methods were used in conjunction with surrogate modeling to predict nodal stresses and coordinates of a compressor blade. The research showed that using an ISOMAP-based dual-RBF surrogate model for predicting nodal stresses decreased the estimated mean error of the surrogate by 35.7% compared to PCA. Using nonlinear dimensionality-reduction-based surrogates did not reduce surrogate error for predicting nodal coordinates. A new metric, the manifold distance ratio (MDR), was introduced to measure the nonlinearity of the data manifolds. When applied to the stress and coordinate data, the stress space was found to be more nonlinear than the coordinate space for this application. The upfront training cost of the nonlinear dimensionality-reduction-based surrogates was larger than that of their linear counterparts but small enough to remain feasible. After training, all the dual-RBF surrogates were capable of making real-time predictions. This same process was repeated for a separate application involving the nodal displacements of mode shapes obtained from a FEA modal analysis. The modal assurance criterion (MAC) calculation was used to compare the predicted mode shapes, as well as their corresponding true mode shapes obtained from FEA, to a set of reference modes. The research showed that two nonlinear techniques, namely LLE and KPCA, resulted in lower surrogate error in the more complex design spaces. Using a RBF kernel, KPCA achieved the largest average reduction in error of 13.57%. The results also showed that surrogate error was greatly affected by mode shape reversal. Four different approaches of identifying reversed mode shapes were explored, all of which resulted in varying amounts of surrogate error. Together, the methods explored in this research were shown to decrease surrogate error when performing DSE of a turbomachine compressor blade. As surrogate accuracy increases, so does the ability to correctly make engineering decisions and judgements throughout the design process. Ultimately, this will help engineers design better turbomachines.
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Lehbab, Imène. "Problèmes métriques dans les espaces de Grassmann." Electronic Thesis or Diss., Mulhouse, 2023. http://www.theses.fr/2023MULH6508.
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Il s'agit d'une contribution dans le domaine de la géométrie métrique du plan projectif complexe CP2 et de la variété de Grassmann réelle des plans dans R6. On s'intéresse à l'étude de tous les p-uplets, p ≥ 3, de droites équiangulaires dans C3 et des p-uplets de plans équi-isoclins dans R6. Sachant que 9 est le nombre maximum de droites équiangulaires que l'on peut construire dans C3, on décrit une méthode qui permet de construire tous les p-uplets de droites équiangulaires pour tout pϵ[3,9]. En particulier, on construit dans C3 cinq classes de congruence de quadruplets de droites équiangulaires dont une dépend d'un paramètre réel ɣ que l'on étend à une famille infinie de sextuplets de droites équiangulaires dépendant du même paramètre réel ɣ. En outre, on donne les angles pour lesquels nos sextuplets s'étendent au-delà et jusqu'aux 9-uplets. On sait qu'il existe un p-uplet, p≥3, de plans équi-isoclins engendrant Rr, r≥4, de paramètre c, 0<br>This work contributes to the field of metric geometry of the complex projective plane CP2 and the real Grassmannian manifold of the planes in R6. More specifically, we study all p-tuples, p ≥ 3, of equiangular lines in C3 or equidistant points in CP2, and p-tuples of equi-isoclinic planes in R6. Knowing that 9 is the maximum number of equiangular lines that can be constructed in C3, we develop a method to obtain all p-tuples of equiangular lines for all p ϵ [3,9]. In particular, we construct in C3 five congruence classes of quadruples of equiangular lines, one of which depends on a real parameter ɣ, which we extend to an infinite family of sextuples of equiangular lines depending on the same real parameter ɣ. In addition, we give the angles for which our sextuples extend beyond and up to 9-tuples. We know that there exists a p-tuple, p ≥ 3, of equi-isoclinic planes generating Rr, r ≥ 4, with parameter c, 0< c <1, if and only if there exists a square symmetric matrix, called Seidel matrix, of p × p square blocks of order 2, whose diagonal blocks are all zero and the others are orthogonal matrices in O(2) and whose smallest eigenvalue is equal to - 1/c and has multiplicity 2p-r. In this thesis, we investigate the case r=6 and we also show that we can explicitly determine the spectrum of all Seidel matrices of order 2p, p ≥ 3 whose off-diagonal blocks are in {R0, S0} where R0 and S0 are respectively the zero-angle rotation and the zero-angle symmetry. We thus show an unexpected link between some p-tuples of equi-isoclinic planes in Rr and simple graphs of order p
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Yao, Wei-Ting, and 姚威廷. "Isometric sliced inverse regression for nonlinear manifolds learning." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/24460542302146689830.
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碩士<br>淡江大學<br>數學學系碩士班<br>98<br>Sliced inverse regression (SIR) was introduced to find an effective linear dimension-reduction direction to explore the intrinsic structure of high dimensional data. In this study, we present isometric SIR for nonlinear dimension reduction - a hybrid of the SIR method using the geodesic distance approximation. First, the proposed method computes the isometric distance between data points; the resulting distance matrix is then sliced according to hierarchical clustering results with rank-two ellipse seriation, and the classical SIR algorithm is applied. We show that the isometric SIR can recover the embedded dimensionality and geometric structure of a nonlinear manifold dataset (e.g., the Swiss-roll). We illustrate how isometric SIR features can further be used for the classification problems. Finally, we report and discuss this novel method in comparison to several existing dimension-reduction techniques.
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Kotrla, Kris William. "Effect of explosive upper body exercises on biomechanical parameters in males 18-30 years of age." 2005. http://www.oregonpdf.org.
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Thesis (M.S.)--Michigan State University, 2005.<br>Includes bibliographical references (leaves 143-147). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.
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O'Neill, Elizabeth C. "Effects of cigarette smoking on physiological parameters during resistance training." 2003. http://www.oregonpdf.org.
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Bronson, Laurie L. "The free testosterone:cortisol response to resistance exercise in women." 2004. http://www.oregonpdf.org.
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Thesis (M.A.)--University of North Carolina at Chapel Hill, 2004.<br>Includes bibliographical references (leaves 30-33). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.
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chwan, Chen wen, and 陳文川. "Evaluation of Low Back Mechanics and Risk for Maximum Isometric Lifting Exertion." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/07604398430845113415.
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碩士<br>南台科技大學<br>工業管理研究所<br>96<br>This study aimed to evaluate the risk of low back injury of lifting in manual materials handling tasks. This study examined human maximum whole body isometric lifting strength in two lifting heights and five lifting postures, and their effects on the force generated at the L5/S1 disc. This study collected human maximum whole body isometric lifting strengths and body joint angles when lifting for different lifting heights and lifting postures. Then, this study applied low back evaluation program for manual materials lifting to calculate the compression and shear forces generated at the L5/S1 disc when performing maximum whole body isometric lifting strengths. The risk evaluation of low back injury for exerting maximum whole body isometric lifting strengths was based on the compression and shear forces generated at the L5/S1 disc.
The overall results demonstrated that the effects of lifting height, posture, and their interactions on the force generated at the L5/S1 disc were significant. We could reduce the risk of low back injury caused by overexertion in low lifting height through human factors intervention. We also could arrange a more efficient lifting height and safer lifting posture. This study recommended that a greater maximum isometric lifting strength could be exerted in a more extended legs posture, while the posture of full flexed legs would be safer.
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Centerbar, David Brian. "Contextual meaning of isometric arm flexion and extension and implications for affective processing /." 2003. http://wwwlib.umi.com/dissertations/fullcit/3108779.
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Mutchler, Margaret Mary. "A simulatory model for predicting muscle tensions in the index finger for selected isometric tasks." 1988. http://catalog.hathitrust.org/api/volumes/oclc/17633587.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1988.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 59-62).
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Almosnino, Sivan. "Reliability of Isometric Neck Strength and Electromyography Measures Relevant for Concussion Prevention in Athletes." Thesis, 2009. http://hdl.handle.net/1974/5200.
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The purpose of this investigation was to assess the between-day reliability of selected force-time curve indices and the activity onset of selected neck muscles in the performance of maximal, isometric contractions in five different directions. The measures extracted are deemed important for future investigations aimed at exploring the role of cervical musculature in reduction of concussion occurrences in sports.
Twenty eight physically active male participants performed two testing sessions separated by 7-8 days. In each testing session, force and surface electromyography (EMG) data were recorded simultaneously in a custom-made testing apparatus whilst subjects performed four randomized maximal isometric efforts in extension, flexion, and left and right lateral bending and protraction. The variables examined were the peak force, rate of force development (RFD), time to 50% of peak force and bilateral activity onset of the splenius capitis, upper trapezius, and sternocleidomastoid. For all variables, reliability was assessed by: 1) difference scores between the testing sessions and corresponding 95% confidence intervals; 2) standard error of measurement (SEM), expressed in either the original units of measurement, or as a coefficient of variation; and, 3) Intraclass correlation coefficients (ICC). The results indicated that for all variables, in all testing directions, no differences in scores were observed between the first and second testing sessions. The precision of measurement for all measures, barring muscle onsets obtained in protraction, was deemed acceptable for future clinical application. ICC score ranges for force-time curve-based measurements were high (< 0.90), while for muscle onsets, the ICC ranges are low to moderate (0.23 -0.79).
Based on these results, it was concluded that, in highly active male participants, a dedicated familiarization session for the elimination of potential learning effects is not required. In addition, for the majority of testing directions, the force-time curve-based variables as well as muscle activity onsets are recorded with a sufficiently high level of precision, which make them prime candidates for utilization in future investigations concerned with quantitative assessment of cervical musculature function.<br>Thesis (Master, Kinesiology & Health Studies) -- Queen's University, 2009-09-23 01:23:12.324
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Rogers, Sharon D. "Resistance training for adults with Alzheimer's disease and related dementias feasibility of program implementation, appropriateness of participant engagement, and effects on physical performance and quality of life /." 2005. http://www.oregonpdf.org.
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Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 2005.<br>Includes bibliographical references (leaves 113-124). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.
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Zemas, Konstantinos. "Geometric rigidity estimates for isometric and conformal maps from S^(n-1) to R^n." 2020. https://ul.qucosa.de/id/qucosa%3A73090.
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In this thesis we study qualitative as well as quantitative stability aspects of isometric and conformal maps from S^(n-1) to R^n, when n is greater or equal to 2 or 3 respectively. Starting from the classical theorem of Liouville, according to which the isometry group of S^(n-1) is the group of its rigid motions and the conformal group of S^(n-1) is the one of its Möbius transformations, we obtain stability results for these classes of mappings among maps from S^(n-1) to R^n in terms of appropriately defined deficits.
Unlike classical geometric rigidity results for maps defined on domains of R^n and mapping into R^n, not only an isometric\ conformal deficit is necessary in this more flexible setting, but also a deficit measuring how much the maps in consideration distort S^(n-1) in a generalized sense. The introduction of the latter is motivated by the classical Euclidean isoperimetric inequality.
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Tsao, Paul, and 曹博舜. "Isometry Aerial Images Stitching for Ground Object Positioning." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9m39t7.
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碩士<br>國立交通大學<br>網路工程研究所<br>107<br>Recent studies such as vehicle recognition, traffic flow calculation, etc. uses aerial video collected by UAV as image sources. If UAV hovers at a fixed position, the coordinates of objects in images can be considered as reference for predicting parameters such as distance and direction. However, this does not apply if the UAV is moving. In this research, a distance-preserving global coordinate system is constructed. To accomplish this goal, some image processing technique are involved. The commonly used image stitching methods does not care about distance-preserving, and usually causes cumulative error. In our research, GPS information is used to estimate the initial position of each image, and a fine-tuned panorama is created based on SIFT feature pair and gradient method. At last, this paper integrates methods as mentioned into implementation and presents visualized data. Both the trajectory of UAV and the relative position of objects across multiple images can be observed by user in order to verify feasibility and precision of methods. Experiment shows the positioning error of our method in a 235×125 area is about 3.6 meters.