文章基本信息

标题：Dependence of Muscle Torque of Ankle Plantar and Dorsal Flexors on Different Ankle Angles
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作者：Rima Solianik ; Vaida Aleknavičiūtė ; Zita Andrijauskaitė 等
期刊名称：Baltic Journal of Sport and Health Sciences
印刷版ISSN：2351-6496
电子版ISSN：2538-8347
出版年度：2018
卷号：1
期号：80
DOI：10.33607/bjshs.v1i80.343
语种：English
出版社：Lithuanian Sports University
摘要：Research background and hypothesis. There is much research information about the relationship between the knee joint angle and the quadriceps muscle torque (Mohamed et al., 2002), but still we lack evidence about the relationship between ankle angle and calf muscle torque. Research aim. The purpose of this research was to establish the dependence of maximal voluntary contraction (MVC) and electrical stimulation (ES)-evoked torque and calf muscle electrical activity (EMG) on different ankle plantar and dorsal ﬂ exion angles. We hypothesized that the calf muscle MVC and ES-evoked torque as well as muscle EMG amplitude would increase with increasing muscle length (i. . increasing ankle angle). Research methods. The subjects in the research were ten non-trained men. Calf plantar and dorsal ﬂ exors muscle ES and MVC torque were tested at eight different ankle angles (–25 o ; –15 o ; –5 o ; 0 o ; 15 o ; 25 o ; 35 o ; 45 o ) which were chosen in randomized sequence. The tibialis anterior, soleus, gastrocnemius lateralis and medialis muscle EMG were measured during muscle MVC. Research results. The results showed that the highest ES-evoked and MVC developed torque of plantar ﬂ exion muscles was at –25° ankle angle (149.1 ± 31.6 N·m and 207.8 ± 38.1 N·m, respectively), while the highest dorsal ﬂ exion MVC muscle torque was at 25° ankle angle (47.2 ± 8.1 N·m). However, dorsal ﬂ exion muscle MVC torque increased with the muscle length only until 25° ankle angle. Discussion and conclusions. Plantar flexion muscle electrical stimulation evoked and plantar / dorsal ﬂ exion muscle maximal voluntary contraction torques are highest at that ankle angle where muscle length is the longest. Keywords: maximal voluntary contraction, electrical stimulation, EMG.