Muscle contractile and relaxation indices in qualified freestyle athletes

O. Kolosova, T. Khalyavka
National University of Physical Education and Sport in Ukraine, Kyiv; National University of Physical Education and Sport in Ukraine, Kyiv

Abstract


Adaptation to physical stress in the extreme conditions of sports activity is one of the most actual problems of sports physiology and medicine. Development of the principles of special muscle relaxation exercises can be one of the ways to improve the special physical capability of athletes without increasing number of sports injuries. Muscle relaxation velocity is as important indice of neuromuscular system functioning and capacities of the human organism as muscle contraction one. The objective of the study was to assess contractile and relaxation muscle properties in qualified athletes, specializing in freestyle. Ten athletes, 18-27 years of age, took part in this EMG-study. The method of superficial electromyography was used. Muscle contractile and relaxation characteristics of leg muscles – m. tibialis anterior and m. gastrocnemius lateralis during isometric maximal voluntary contraction were investigated. The magnitudes of muscle voluntary contraction (MVC), voluntary contraction velocity (VCV), voluntary relaxation velocity (VRV) in m. tibialis anterior (TA) and m. gastrocnemius lateralis (GL) were assessed during dorsiflexion and plantar flexion, respectively. Some specific significant differences of above mentioned indices were determined. It was found that VRV of the TA left side and VRV of GL both sides were significantly (p<0,05) less than corresponding VCV. This might be due to predominance of excitatory processes over inhibitory ones in the neuromuscular system of this tested group. Besides this, VCV of the GL left side was significantly higher than of the right one (p<0,05). This might be the evidence of specific adaptative reactions of neuromuscular system to physical activity, associated with the peculiarities of muscle coordination during freestyle athletes movements. Apparently, there is a necessity of developing special relaxation exercises and introducing them in the training process to improve the effectiveness of athletic training while keeping athletes health.


Keywords


muscle voluntary contraction velocity, muscle voluntary relaxation velocity, maximal voluntary contraction

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Received: 05.03.2018

Revised: 09.04.2018

Signed for publication: 09.04.2018




DOI: http://dx.doi.org/10.17721/2616_6410.2018.24.42-45

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