نتایج جستجو برای: isotonic contraction

تعداد نتایج: 62298  

2009
Natalie S. Schneider Akira Amano

Since regulation of cardiac muscle contraction is complex, many simulation studies have been conducted to systematically analyze regulatory mechanisms underlying the force-velocity relationship. However, past studies were performed with models lacking detailed thin filament activation despite its essential regulatory role. Here a novel cardiac muscle contraction model is presented that consider...

Journal: :Circulation research 1981
L H Chuck M A Goethals W W Parmley D L Brutsaert

The relaxation of isolated cardiac muscles from mammals was recently shown to be sensitive to the loading conditions because the time course of relaxation could be changed by changing the load. This effect apparently is related to the amount and functional status of the sarcoplasmic reticulum. The purpose of this study was to determine whether hypoxia affected the load sensitivity of papillary ...

Journal: :The Journal of experimental biology 2016
Stan L Lindstedt

The history of muscle physiology is a wonderful lesson in 'the scientific method'; our functional hypotheses have been limited by our ability to decipher (observe) muscle structure. The simplistic understanding of how muscles work made a large leap with the remarkable insights of A. V. Hill, who related muscle force and power to shortening velocity and energy use. However, Hill's perspective wa...

Journal: :General physiology and biophysics 1990
L B Katsnelson Izakov VYa V S Markhasin

A mechanical model of heart muscle is proposed which includes rheological equations and equations for Ca-troponin interaction, for the dependences of the number of myosin cross-bridges on the length of sarcomere and on the speed of motion. The main assumption of the model is the dependence of the troponin affinity to calcium ions on the number of myosin cross-bridges attached. The model success...

2007
Juliana de Paiva Tosato Paulo Henrique Ferreira Caria

INTRODUCTION Temporomandibular disorders (TMD) present several signs and symptoms that hinder their correct diagnosis, which is imperative on the elaboration of a treatment plan. Over the past years, several studies have been conducted to characterize and classify TMD to better understand these disorders. Therefore, the purpose of this study was to assess the electromyographic behavior of the m...

2016
Chunying Hu Qiuchen Huang Lili Yu Yue Zhou Rui Gu Yao Cui Meng Ge Yanfeng Xu Jianfeng Liu

[Purpose] The aim of this study was to examine the immediate effects of muscle strength training and neuromuscular joint facilitation distal resistance training on wrist joints by using electromechanical reaction time. [Subjects and Methods] The subjects were 12 healthy young people (24.2 ± 3.1 years, 169.7 ± 6.5 cm, 65.3 ± 12.6 kg). Two kinds of isotonic contraction techniques were applied on ...

Journal: :Circulation research 1967
E O Feigl

Whether a change in myocardial eontractihty is accompanied by a change in diastolic extensibility was studied by altering stimulation frequency, including paired stimulation, as the inotropic intervention. Isometric and isotonic contractions of isolated cat papillary muscles were examined. Apparent changes in diastolic extensibility were observed with paired stimulation in isometric preparation...

2016
Chunying Hu Qiuchen Huang Lili Yu Yue Hu Xia Rongming Zhou Li Fu Xiaojiao Rui Gu Yao Cui Meng Ge Yanfeng Xu Jianfeng Liu

[Purpose] The purpose of this study was to examine immediate effects of strength training and NJF distal resistance training in wrist joints by using writing time and evaluation of proprioception using the JPE test. [Subjects and Methods] The subjects were 12 young healthy people (24.2 ± 3.1 y, 169.7 ± 6.5 cm, 65.3 ± 12.6 kg). Two isotonic contraction techniques were applied on the wrist joint:...

Journal: :Journal of applied physiology 2007
A N Devrome B R MacIntosh

Edman has reported that the force-velocity relationship (FVR) departs from Hill's classic hyperbola near 0.80 of measured isometric force (J Physiol 404: 301-321, 1988). The purpose of this study was to investigate the biphasic nature of the FVR in the rested state and after some recovery from fatigue in the rat medial gastrocnemius muscle in situ. Force-velocity characteristics were determined...

Journal: :Journal of experimental zoology. Part A, Ecological genetics and physiology 2016
Ariel L Camp Henry C Astley Angela M Horner Thomas J Roberts Elizabeth L Brainerd

Accurate measurements of muscle length changes are essential for understanding the biomechanics of musculoskeletal systems, and can provide insights into muscular work, force, and power. Muscle length has typically been measured in vivo using sonomicrometry, a method that measures distances by sending and receiving sound pulses between piezoelectric crystals. Here, we evaluate an alternative me...

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