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Journal articles on the topic 'Contraction Analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Gholidahneh, Abdolsattar, Shaban Sedghi, and Vahid Parvaneh. "Some Fixed Point Results for Perov-Ćirić-Prešić Type F-Contractions with Application." Journal of Function Spaces 2020 (August 28, 2020): 1–9. http://dx.doi.org/10.1155/2020/1464125.

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Ćirić and Prešić developed the concept of Prešić contraction to Ćirić-Prešić type contractive mappings in the background of a metric space. On the other hand, Altun and Olgun introduced Perov type F-contractions. In this paper, we extend the concept of Ćirić-Prešić contractions to Perov-Ćirić-Prešić type F-contractions. Our results modify some known ones in the literature. To support our main result, an example and an application to nonlinear operator systems are presented.

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2

Tamura, Yuki, Karina Kouzaki, Takaya Kotani, and Koichi Nakazato. "Electrically stimulated contractile activity-induced transcriptomic responses and metabolic remodeling in C2C12 myotubes: twitch vs. tetanic contractions." American Journal of Physiology-Cell Physiology 319, no. 6 (2020): C1029—C1044. http://dx.doi.org/10.1152/ajpcell.00494.2019.

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The contraction of myotubes using electrical pulse stimulation is a research tool used to mimic muscle contractile activity and exercise in rodents and humans. Most protocols employed in previous work used low-frequency twitch contractions. However, high-frequency tetanus contractions that are more physiologically relevant to muscle contractions in vivo are poorly characterized. In this report, the similarities and differences in acute responses and chronic adaptations with different contractile modes using twitches (2 Hz, continuous, 3 h) and tetanus (66 Hz, on: 5 s/off: 5 s, 3 h) were invest

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3

Liao, Fang-fang, Yongxin Jiang, and Zhiting Xie. "A Generalized Nonuniform Contraction and Lyapunov Function." Abstract and Applied Analysis 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/613038.

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For nonautonomous linear equationsx′=A(t)x, we give a complete characterization of general nonuniform contractions in terms of Lyapunov functions. We consider the general case of nonuniform contractions, which corresponds to the existence of what we call nonuniform(D,μ)-contractions. As an application, we establish the robustness of the nonuniform contraction under sufficiently small linear perturbations. Moreover, we show that the stability of a nonuniform contraction persists under sufficiently small nonlinear perturbations.

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4

Siegle, M. L., and H. J. Ehrlein. "Interdigestive contractile patterns of the ileum in dogs." American Journal of Physiology-Gastrointestinal and Liver Physiology 253, no. 4 (1987): G452—G460. http://dx.doi.org/10.1152/ajpgi.1987.253.4.g452.

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The aim of this study is to elucidate the nature of ileal interdigestive contractile patterns by the computerized analysis of the contraction spread and by videofluoroscopy. Conscious dogs equipped with closely spaced strain-gauge force transducers were used. Two patterns of repetitive, phasic contractions were recorded, migrating clusters and phase IIIs; both patterns consisted of repetitive, propagated contractions. Both patterns migrated aborad by sequential movement of contraction waves down the bowel. Consequently, the rate of migration of either of the entire patterns was slower than the

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5

Chen, Chi-Ming, Zhi-Hao Xu, and Erdal Karapinar. "Soft Fixed Point Theorems for the Soft Comparable Contractions." Journal of Function Spaces 2021 (March 11, 2021): 1–8. http://dx.doi.org/10.1155/2021/5554510.

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In this article, we introduce the notions of a soft inf -comparable contraction and soft comparable Meir-Keeler contraction in a soft metric space. Furthermore, we prove two soft fixed point theorems which assure the existence of soft fixed points for these two types of comparable contractions. The obtained results not only generalize but also unify many recent fixed point results in the literature.

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6

Grieve, Jack. "A regional analysis of contraction rate in written Standard American English." International Journal of Corpus Linguistics 16, no. 4 (2011): 514–46. http://dx.doi.org/10.1075/ijcl.16.4.04gri.

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The goal of this study is to determine if various measures of contraction rate are regionally patterned in written Standard American English. In order to answer this question, this study employs a corpus-based approach to data collection and a statistical approach to data analysis. Based on a spatial autocorrelation analysis of the values of eleven measures of contraction across a 25 million word corpus of letters to the editor representing the language of 200 cities from across the contiguous United States, two primary regional patterns were identified: easterners tend to produce relatively f

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7

Razani, A., and N. Karamikabir. "Set Contractions and KKM Mappings in Banach Spaces." Abstract and Applied Analysis 2013 (2013): 1–4. http://dx.doi.org/10.1155/2013/346094.

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Some fixed point theorems for generalized set contraction maps and KKM type ones in Banach spaces are presented. Moreover, a new generalized set contraction is introduced. As an application, some coincidence theorems for KKM type set contractions are obtained.

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8

Athira, T., and P. Shaniba Asmi. "Analysis of Unipolar and Bipolar 4x4 EHG Signal for Classifying Uterine Contraction." Biomedical and Pharmacology Journal 12, no. 2 (2019): 1009–14. http://dx.doi.org/10.13005/bpj/1729.

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Proper evaluation and detection of uterine contraction is an important treat during gestation period. Uterine contraction happens by the generation of electrical activity from a given myometrial cell to the adjacent cell. There are various methods for monitoring uterine contraction but they lack to distinguish true labour contractions (efficient) from contractions that will not cause delivery (inefficient). One of the most accurate non-invasive technique for monitoring uterine contraction is the uterine electromyogram or Electrohysterogram (EHG). The main aim of this paper is to check whether

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9

Sosnowska, Anna J., Aleksandra Vuckovic, and Henrik Gollee. "Automated semi-real-time detection of muscle activity with ultrasound imaging." Medical & Biological Engineering & Computing 59, no. 9 (2021): 1961–71. http://dx.doi.org/10.1007/s11517-021-02407-w.

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AbstractUltrasound imaging (USI) biofeedback is a useful therapeutic tool; however, it relies on qualitative assessment by a trained therapist, while existing automatic analysis techniques are computationally demanding. This study aims to present a computationally inexpensive algorithm based on the difference in pixel intensity between USI frames. During an offline experiment, where data was analyzed after the study, participants performed isometric contractions of the gastrocnemius medialis (GM) muscle, as executed (30% of maximum contraction) or attempted (low force contraction up to a point

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10

Sabiri, Mustapha, Abdelhafid Bassou, Jamal Mouline, and Taoufik Sabar. "Fixed Points Results for Various Types of Tricyclic Contractions." Axioms 10, no. 2 (2021): 72. http://dx.doi.org/10.3390/axioms10020072.

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In this paper, we introduce four new types of contractions called in this order Kanan-S-type tricyclic contraction, Chattergea-S-type tricyclic contraction, Riech-S-type tricyclic contraction, Cirić-S-type tricyclic contraction, and we prove the existence and uniqueness for a fixed point for each situation.

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11

Kern, Mark K., Ronald C. Arndorfer, James S. Hyde, and Reza Shaker. "Cerebral cortical representation of external anal sphincter contraction: effect of effort." American Journal of Physiology-Gastrointestinal and Liver Physiology 286, no. 2 (2004): G304—G311. http://dx.doi.org/10.1152/ajpgi.00201.2003.

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The external anal sphincter (EAS) plays a critical role in maintaining fecal continence; however, cerebral cortical control of voluntary EAS contraction is not completely understood. Our aims were to determine the cortical areas associated with voluntary EAS contraction and to determine the effect of two levels of sphincter contraction effort on brain activity. Seventeen asymptomatic adults (ages 21-48, 9 male) were studied using functional magnetic resonance imaging (fMRI) to detect brain activity. Studies were done in two stages. In stage 1 (10 subjects, 5 male), anal sphincter pressure was

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12

Latif, Abdul, and Dinh The Luc. "A General Fixed Point Theorem for Multivalued Mappings That Are Not Necessarily Contractions and Applications." Abstract and Applied Analysis 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/104762.

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13

Sintunavarat, Wutiphol, and Poom Kumam. "The Existence Theorems of an Optimal Approximate Solution for Generalized Proximal Contraction Mappings." Abstract and Applied Analysis 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/375604.

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Recently, Basha (2011) established the best proximity point theorems for proximal contractions of the first and second kinds which are extension of Banach's contraction principle in the case of non-self-mappings. The aim of this paper is to extend and generalize the notions of proximal contractions of the first and second kinds which are more general than the notion of self-contractions, establish the existence of an optimal approximate solution theorems for these non-self-mappings, and also give examples to validate our main results.

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14

Watson, P. A., R. Hannan, L. L. Carl, and K. E. Giger. "Desmin gene expression in cardiac myocytes is responsive to contractile activity and stretch." American Journal of Physiology-Cell Physiology 270, no. 4 (1996): C1228—C1235. http://dx.doi.org/10.1152/ajpcell.1996.270.4.c1228.

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Experiments were performed to assess the ability of mechanical stimuli, experienced by ventricular cardiac myocytes during the progression of hypertrophic and dilated pathology, to increase the expression of desmin in cultured neonatal rat cardiac myocytes. Results indicate that both contractile activity and load due to passive stretch increase desmin content in neonatal rat cardiac myocytes through increased desmin gene transcription. Western blot analysis demonstrated that contraction induced a selective increase in desmin protein content in neonatal rat cardiac myocytes above increases obse

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15

Huang, Huaping, Zoran D. Mitrović, Kastriot Zoto, and Stojan Radenović. "On Convex F-Contraction in b-Metric Spaces." Axioms 10, no. 2 (2021): 71. http://dx.doi.org/10.3390/axioms10020071.

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In this paper, we introduce a notion of convex F-contraction and establish some fixed point results for such contractions in b-metric spaces. Moreover, we give a supportive example to show that our convex F-contraction is quite different from the F-contraction used in the existing literature since our convex F-contraction does not necessarily contain the continuous mapping but the F-contraction contains such mapping. In addition, via some facts, we claim that our results indeed generalize and improve some previous results in the literature.

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16

Morales, J. R., E. M. Rojas, and Ravindra K. Bisht. "Common Fixed Points for Pairs of Mappings with Variable Contractive Parameters." Abstract and Applied Analysis 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/209234.

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17

Abbas, Mujahid, Basit Ali, and Salvador Romaguera. "Generalized Contraction and Invariant Approximation Results on Nonconvex Subsets of Normed Spaces." Abstract and Applied Analysis 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/391952.

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Wardowski (2012) introduced a new type of contractive mapping and proved a fixed point result in complete metric spaces as a generalization of Banach contraction principle. In this paper, we introduce a notion of generalizedF-contraction mappings which is used to prove a fixed point result for generalized nonexpansive mappings on star-shaped subsets of normed linear spaces. Some theorems on invariant approximations in normed linear spaces are also deduced. Our results extend, unify, and generalize comparable results in the literature.

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18

Messer, A. C., and M. R. Brown. "Non-linear dynamics of neurochemical modulation of mosquito oviduct and hindgut contractions." Journal of Experimental Biology 198, no. 11 (1995): 2325–36. http://dx.doi.org/10.1242/jeb.198.11.2325.

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Microphysiological techniques and computer-based methods of data acquisition and analysis were used to investigate the dynamics of neurochemical action on spontaneous contractions of continuously perfused oviducts and hindguts isolated from female mosquitoes (Aedes aegypti). Proctolin, leucomyosuppressin (LMS), serotonin and octopamine, which are known to modulate insect muscle contractions, and a mosquito neuropeptide, Aedes Head Peptide I (Aea-HP-I), which inhibits host-seeking behavior, were tested in the bioassays. LMS depressed contractile activity in oviducts at concentrations above 10(-

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19

Yildirim, Nuri. "A survival analysis of the contraction phases of business cycles in industrial countries." Panoeconomicus 62, no. 5 (2015): 557–79. http://dx.doi.org/10.2298/pan1505557y.

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This study tried to determine whether systematic changes have taken place in the size (amplitude) and duration (length) of business cycle phases in industrial countries over the past half century and to analyze, by using two parametric duration models, mainly, Gompertz and Weibull models, the possible effects of some macroeconomic variables, such as labor productivity growth, inflation, real interest rate, openness, oil prices, and gross saving rate, on the duration of the contraction phases of business cycles. The reference turning point chronology elaborated by the OECD for 23 industrial cou

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20

McLelland, Grant, David MacManus, and Chris Sheaf. "A semi-empirical model for streamwise vortex intensification." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 12 (2019): 4396–409. http://dx.doi.org/10.1177/0954410019838421.

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Vortex intensification plays an important role in a wide range of flows of engineering interest. One scenario of interest is when a streamwise vortex passes through the contracting streamtube of an aircraft intake. There is, however, limited experimental data of flows of this type to reveal the dominant flow physics and to guide the development of vortex models. To this end, the evolution of wing-tip vortices inside a range of streamtube contractions has been measured using stereoscopic particle image velocimetry. A semi-empirical model has been applied to provide new insight on the role of vo

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21

Joshi, Meena, and Anita Tomar. "On Unique and Nonunique Fixed Points in Metric Spaces and Application to Chemical Sciences." Journal of Function Spaces 2021 (May 6, 2021): 1–11. http://dx.doi.org/10.1155/2021/5525472.

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We introduce the notions of a generalized Θ -contraction, a generalized Θ E -weak contraction, a Ψ E -weak JS-contraction, an integral-type Θ E -weak contraction, and an integral-type Ψ E -weak JS-contraction to establish the fixed point, fixed ellipse, and fixed elliptic disc theorems. Further, we verify these by illustrative examples with geometric interpretations to demonstrate the authenticity of the postulates. The motivation of this work is the fact that the set of nonunique fixed points may include a geometric figure like a circle, an ellipse, a disc, or an elliptic disc. Towards the en

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22

Igarashi, Y., Y. Goto, O. Yamada, T. Ishii, and H. Suga. "Transient vs. steady end-systolic pressure-volume relation in dog left ventricle." American Journal of Physiology-Heart and Circulatory Physiology 252, no. 5 (1987): H998—H1004. http://dx.doi.org/10.1152/ajpheart.1987.252.5.h998.

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We compared transient slope of end-systolic pressure-volume line (T-Emax) with steady Emax (S-Emax) in isolated cross-circulated canine left ventricles. T-Emax is the slope of the end-systolic pressure-volume line (ESPVL) determined from the last steady-state ejecting contraction (SEC) and the first transient isovolumic contraction produced by end-diastolic volume clamp. S-Emax is the slope of ESPVL determined from five steady-state contractions by linear regression analysis. We obtained three T-Emax values in the same contractile state by changing ejection fraction (EF) of SEC to three levels

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23

He, Fuli, Z. Mostefaoui, and M. Abdalla. "Fixed Point Theorems for Mizoguchi-Takahashi Type Contraction in Bicomplex-Valued Metric Spaces and Applications." Journal of Function Spaces 2020 (June 4, 2020): 1–7. http://dx.doi.org/10.1155/2020/4070324.

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The main aim of this paper is to study and establish some new fixed point theorems for contractive maps that satisfied Mizoguchi-Takahashi’s condition in the setting of bicomplex-valued metric spaces. These new results improve and generalize the Banach contraction principle and some well-known results in the literature. Finally, as applications of our results, we give the existence and uniqueness of the solution of a nonlinear integral equation.

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24

Deschodt-Arsac, Véronique, Guillaume Calmettes, Gilles Gouspillou, et al. "System analysis of the effect of various drugs on cardiac contraction energetics." Biochemical Society Transactions 38, no. 5 (2010): 1319–21. http://dx.doi.org/10.1042/bst0381319.

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We used MoCA (Modular Control and Regulation Analysis) to demonstrate in intact beating rat heart that physiological activation of contraction by adrenaline involves the almost perfect parallel activation of both mitochondria and myofibrils by intracellular Ca2+. This explains the perfect homoeostasis of the energetic intermediate PCr (phosphocreatine) in heart. When using drugs specifically stimulating either supply or demand activities, MoCA helped reveal the very specific mode of regulation of heart contraction energetics. Only activation of myofibrils activity (demand), either by increasin

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25

Benink, Hélène A., Craig A. Mandato, and William M. Bement. "Analysis of Cortical Flow Models In Vivo." Molecular Biology of the Cell 11, no. 8 (2000): 2553–63. http://dx.doi.org/10.1091/mbc.11.8.2553.

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Cortical flow, the directed movement of cortical F-actin and cortical organelles, is a basic cellular motility process. Microtubules are thought to somehow direct cortical flow, but whether they do so by stimulating or inhibiting contraction of the cortical actin cytoskeleton is the subject of debate. Treatment ofXenopus oocytes with phorbol 12-myristate 13-acetate (PMA) triggers cortical flow toward the animal pole of the oocyte; this flow is suppressed by microtubules. To determine how this suppression occurs and whether it can control the direction of cortical flow, oocytes were subjected t

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26

Chen, Lili, Shuai Huang, Chaobo Li, and Yanfeng Zhao. "Several Fixed-Point Theorems for F -Contractions in Complete Branciari b -Metric Spaces and Applications." Journal of Function Spaces 2020 (November 24, 2020): 1–10. http://dx.doi.org/10.1155/2020/7963242.

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In this paper, we prove the existence and uniqueness of fixed points for F -contractions in complete Branciari b -metric spaces. Furthermore, an example for supporting the related result is shown. We also present the concept of the weak well-posedness of the fixed-point problem of the mapping T and discuss the weak well-posedness of the fixed-point problem of an F -contraction in complete Branciari b -metric spaces. Besides, we investigate the problem of common fixed points for F -contractions in above spaces. As an application, we apply our main results to solving the existence and uniqueness

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27

Bakr, Sahar Mohamed Ali Abou. "A Study on Common Fixed Point of Joint A;B Generalized Cyclic ϕ−abc Weak Nonexpansive Mappings and Generalized Cyclic abc;r Contractions in Quasi Metric Spaces". Abstract and Applied Analysis 2020 (13 липня 2020): 1–10. http://dx.doi.org/10.1155/2020/9427267.

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This manuscript proves the existence of a single common fixed point of two joint A,B generalized cyclic ϕ−abc weak nonexpansive mappings, where A and B are compact sets. The result in particular demonstrated a single fixed point of generalized cyclic ϕ−abc weak nonexpansive mappings, without the assumption of a single contracting point. Additionally, it introduces new types of generalized cyclic abc;r contraction mappings and describes the existence of a single fixed point of them in b-metric spaces. Finally, the presented results establish a simpler convergence theorem for a sequence of gener

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28

Acar, Özlem. "Some Fixed-Point Results via Mix-Type Contractive Condition." Journal of Function Spaces 2021 (March 10, 2021): 1–7. http://dx.doi.org/10.1155/2021/5512254.

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We consider a fixed-point problem for mappings involving a rational type and almost type contraction on complete metric spaces. To do this, we are using F -contraction and H , φ -contraction. We also present an example to illustrate our result.

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29

Zakany, Monica. "Multivalued self almost local contractions." Annals of West University of Timisoara - Mathematics and Computer Science 57, no. 1 (2019): 122–38. http://dx.doi.org/10.2478/awutm-2019-0010.

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Abstract We introduce a new class of contractive mappings: the almost local contractions, starting from the almost contractions presented by V. Berinde in [V. Berinde, Approximating fixed points of weak contractions using the Picard iteration Nonlinear Analysis Forum 9 (2004) No.1, 43-53], and also from the concept of local contraction presented by Filipe Martins da Rocha and Vailakis in [V. Filipe Martins-da-Rocha, Y. Vailakis, Existence and uniqueness of a fixed point for local contractions, Econometrica, vol.78, No.3 (May, 2010) 1127-1141]. First of all, we present the notion of multivalued

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30

Bachar, M., and M. A. Khamsi. "On monotone Ćirić quasi-contraction mappings." Journal of Mathematical Inequalities, no. 2 (2016): 511–19. http://dx.doi.org/10.7153/jmi-10-40.

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31

Cavalletti, Fabio, and Flavia Santarcangelo. "Isoperimetric inequality under Measure-Contraction property." Journal of Functional Analysis 277, no. 9 (2019): 2893–917. http://dx.doi.org/10.1016/j.jfa.2019.06.016.

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32

Dooley, Anthony H., and Fulvio Ricci. "The contraction of K to NM." Journal of Functional Analysis 63, no. 3 (1985): 344–68. http://dx.doi.org/10.1016/0022-1236(85)90092-8.

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33

Subag, Eyal M., Ehud Moshe Baruch, Joseph L. Birman, and Ady Mann. "Gabor analysis as contraction of wavelets analysis." Journal of Mathematical Physics 58, no. 8 (2017): 081702. http://dx.doi.org/10.1063/1.4986620.

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34

Kirshners, Arnis. "Clustering-Based Behavioural Analysis of Biological Objects." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 2 (August 5, 2015): 24. http://dx.doi.org/10.17770/etr2011vol2.982.

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The article examines the problem of processing short time series for bioinformatics tasks using data mining methods in the field of pharmacology. The experiments were conducted using heart contraction (contraction and relaxation) power data that were obtained in experiments with laboratory animals with the goal of registering the power changes of heart contractions in different stages of experiment in a given period of time. The selected data were treated using data preprocessing technologies. The short time series were compared using various time-point similarity search methods using agglomer

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Asif, Awais, Sami Ullah Khan, Thabet Abdeljawad, Muahammad Arshad, and Amjad Ali. "3D Dynamic Programming Approach to Functional Equations with Applications." Journal of Function Spaces 2020 (September 21, 2020): 1–9. http://dx.doi.org/10.1155/2020/9485620.

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This article demonstrates the graphical existence of a single fixed point while imposing the contractive condition of Chatterjea type F-contraction on F-metric space (briefly as F-MS). We present two examples that verify the validity of the results given in the paper. The paper further explains the subsistence of the fixed point even if the contractive condition is valid only for a closed ball inside the space rather than imposing it on the whole F-MS. Moreover, the application of the mentioned results in finding a single solution of functional equations is described that is widely used in com

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36

Jeffrey, Brian, Holavanahalli S. Udaykumar, and Konrad S. Schulze. "Flow fields generated by peristaltic reflex in isolated guinea pig ileum: impact of contraction depth and shoulders." American Journal of Physiology-Gastrointestinal and Liver Physiology 285, no. 5 (2003): G907—G918. http://dx.doi.org/10.1152/ajpgi.00062.2003.

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The guinea pig ileum responds to distension with characteristic wall movements, luminal pressure gradients, and outflow (the peristaltic reflex). To date, little is known about whether the peristaltic reflex generates flow events other than laminar flow. Here we used a numerical method to solve for the flow generated by moving walls to assess occlusive contractions ( case 1), nonocclusive contractions ( case 2), and contractions with steep shoulders ( case 3) for which visual parameters of wall movements are published. We found that all three contraction cases produced pressure differentials a

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37

Ren, Yijie, Junlei Li, and Yanrong Yu. "Common Fixed Point Theorems for Nonlinear Contractive Mappings in Dislocated Metric Spaces." Abstract and Applied Analysis 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/483059.

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In 1986, Matthews generalized Banach contraction mapping theorem in dislocated metric space that is a wider space than metric space. In this paper, we established common fixed point theorems for a class of contractive mappings. Our results extend the corresponding ones of other authors in dislocated metric spaces.

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Arsac, Laurent M., Christophe Beuste, Sylvain Miraux, et al. "In vivo modular control analysis of energy metabolism in contracting skeletal muscle." Biochemical Journal 414, no. 3 (2008): 391–97. http://dx.doi.org/10.1042/bj20080280.

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We used 31P MRS (magnetic resonance spectroscopy) measurements of energetic intermediates [ATP, Pi and PCr (phosphocreatine)] in combination with the analytical tools of metabolic control analysis to study in vivo energy metabolism in the contracting skeletal muscle of anaesthetized rats over a broad range of workload. According to our recent MoCA (modular control analysis) used to describe regulatory mechanisms in beating heart, we defined the energetic system of muscle contraction as two modules (PCr-Producer and PCr-Consumer) connected by the energetic intermediates. Hypoxia and electrical

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39

Taylor, Chloe E., Daniel Boulton, Erin J. Howden, Christoph Siebenmann, and Vaughan G. Macefield. "Central command increases muscle sympathetic nerve activity more to contracting than noncontracting muscle during rhythmic isotonic leg exercise." Journal of Neurophysiology 121, no. 5 (2019): 1704–10. http://dx.doi.org/10.1152/jn.00075.2019.

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We have previously shown that the increase in muscle sympathetic nerve activity (MSNA) to contracting muscle during sustained isometric exercise is due primarily to central command and that contracting muscle does not express a metaboreceptor-driven increase in MSNA. Here we tested the hypothesis that MSNA increases to the contracting muscle also during rhythmic isotonic exercise, in which muscle metabolites will not accumulate because the contraction is performed without external load. MSNA was recorded from the common peroneal nerve in 10 participants, and negative-going sympathetic spikes w

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40

Altun, Ishak, Gülhan Mınak, and Murat Olgun. "Fixed points of multivalued nonlinear F-contractions on complete metric spaces." Nonlinear Analysis: Modelling and Control 21, no. 2 (2016): 201–10. http://dx.doi.org/10.15388/na.2016.2.4.

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We introduce a new concept for multivalued maps, also called multivalued nonlinear F-contraction, and give a fixed point result. Our result is a proper generalization of some recent fixed point theorems including the famous theorem of Klim and Wardowski [D. Klim, D. Wardowski, Fixed point theorems for set-valued contractions in complete metric spaces, J. Math. Anal. Appl., 334(1):132–139, 2007].

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Watson, P. A., R. Hannan, L. L. Carl, and K. E. Giger. "Contractile activity and passive stretch regulate tubulin mRNA and protein content in cardiac myocytes." American Journal of Physiology-Cell Physiology 271, no. 2 (1996): C684—C689. http://dx.doi.org/10.1152/ajpcell.1996.271.2.c684.

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Accumulation of tubulin protein and an increased array of microtubules have been associated with contractile dysfunction in cardiac myocytes after pressure overload in vivo. Experiments were performed to assess the ability of mechanical stimuli experienced by ventricular cardiac myocytes during the progression of hypertrophic and dilated pathology to increase beta-tubulin production in cultured neonatal rat cardiac myocytes. Results indicate that both contractile activity and load due to passive stretch increase beta-tubulin protein content in neonatal rat cardiac myocytes through accumulation

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42

Chevreau, Bernard, and Carl Pearcy. "On the structure of contraction operators. I." Journal of Functional Analysis 76, no. 1 (1988): 1–29. http://dx.doi.org/10.1016/0022-1236(88)90046-8.

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43

Brown, Scott W., Bernard Chevreau, and Carl Pearcy. "On the structure of contraction operators. II." Journal of Functional Analysis 76, no. 1 (1988): 30–55. http://dx.doi.org/10.1016/0022-1236(88)90047-x.

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44

Ćirić, Ljubomir. "Multi-valued nonlinear contraction mappings." Nonlinear Analysis: Theory, Methods & Applications 71, no. 7-8 (2009): 2716–23. http://dx.doi.org/10.1016/j.na.2009.01.116.

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Gau, Hwa-Long, and Pei Yuan Wu. "Unitary part of a contraction." Journal of Mathematical Analysis and Applications 366, no. 2 (2010): 700–705. http://dx.doi.org/10.1016/j.jmaa.2010.01.040.

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46

Sayet, I., G. Neuilly, J. Mironneau, and C. Mironneau. "Influence of spaceflight, hindlimb suspension, and venous occlusion on alpha 1-adrenoceptors in rat vena cava." Journal of Applied Physiology 78, no. 5 (1995): 1882–88. http://dx.doi.org/10.1152/jappl.1995.78.5.1882.

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Effects of hindlimb suspension, spaceflight, and venous occlusion were examined in isolated strips from rat vena cava by using both [3H]prazosin-binding and contraction responses evoked by norepinephrine. Sensitivity to norepinephrine was decreased without modification of the maximal contractile response. Furthermore, the high K(+)-induced contractions were not affected, suggesting that there was no interference with voltage-dependent Ca2+ channels. The sensitivity of the norepinephrine-induced contraction to prazosin was decreased, and Scatchard analysis of [3H]prazosin binding indicated an i

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47

Al-Ani, M., K. Robins, A. H. Al-Khalidi, J. Vaile, J. Townend, and J. H. Coote. "Isometric Contraction of Arm Flexor Muscles as a Method of Evaluating Cardiac Vagal Tone in Man." Clinical Science 92, no. 2 (1997): 175–80. http://dx.doi.org/10.1042/cs0920175.

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1. We have previously shown that brief voluntary isometric contractions of upper arm flexor muscles performed for one respiratory cycle elicit a significant decrease in the R—R interval. The present study was designed to determine if similar changes are produced by non-voluntary electrically evoked contractions and, if so, to establish the consistency and repeatability of the associated changes in the R—R interval. 2. The heart rate (R—R interval) response to voluntary or non-voluntary brief isometric contraction equivalent to 40% of the maximum voluntary contraction was studied in 10 healthy

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48

Korohoda, Włodzimierz, Anna Jurkiewicz, Izabela Figiel, and Jarosław Czyż. "A new model for the research into rhythmic contraction activity of cardiomyocytes in vitro." Biochemistry and Cell Biology 73, no. 7-8 (1995): 431–39. http://dx.doi.org/10.1139/o95-050.

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Heart cells continue to contract rhythmically after isolation and in culture in vitro. We describe a model of heart preparation in vitro that permits quantitative research on the frequency of contractions of cardiomyocytes. The chick embryo heart explants placed on a network of elastic glass fibers continued beating for months, recorded and analyzed with the methods of computer-assisted image analysis. The efficacy of this experimental model for the screening of effects of various agents on the frequency of contractions was examined by following the effects of nifedipine, caffeine, ethanol, an

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Hussain, N., M. A. Kutbi, and P. Salimi. "Best Proximity Point Results for Modified --Proximal Rational Contractions." Abstract and Applied Analysis 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/927457.

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We first introduce certain new concepts of --proximal admissible and ---rational proximal contractions of the first and second kinds. Then we establish certain best proximity point theorems for such rational proximal contractions in metric spaces. As an application, we deduce best proximity and fixed point results in partially ordered metric spaces. The presented results generalize and improve various known results from best proximity point theory. Several interesting consequences of our obtained results are presented in the form of new fixed point theorems which contain famous Banach's contra

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Bendahan, David, Benjamin Chatel, and Thomas Jue. "Comparative NMR and NIRS analysis of oxygen-dependent metabolism in exercising finger flexor muscles." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 313, no. 6 (2017): R740—R753. http://dx.doi.org/10.1152/ajpregu.00203.2017.

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Muscle contraction requires the physiology to adapt rapidly to meet the surge in energy demand. To investigate the shift in metabolic control, especially between oxygen and metabolism, researchers often depend on near-infrared spectroscopy (NIRS) to measure noninvasively the tissue O2. Because NIRS detects the overlapping myoglobin (Mb) and hemoglobin (Hb) signals in muscle, interpreting the data as an index of cellular or vascular O2 requires deconvoluting the relative contribution. Currently, many in the NIRS field ascribe the signal to Hb. In contrast, 1H NMR has only detected the Mb signal

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