Specific tension of human plantar flexors and dorsiflexors
Specific tension of human plantar flexors and dorsiflexors
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DOI：
10.1152/jappl.1996.80.1.158
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发表时间：
1996-01-01
影响因子：
3.3
通讯作者：
Edgerton, VR
中科院分区：
文献类型：
--
作者：
Fukunaga, T;Roy, RR;Edgerton, VR
报道的人体骨骼肌比张力测量值差异很大。这种变异性可能至少部分归因于肌肉生理横截面积（PCSA）的确定。在本研究中，沿8名男性受试者的小腿每沿着10 mm采集一次序列磁共振图像，以计算产生跖屈肌和背屈肌扭矩的个体肌肉的体积和随后的PCSA。最大跖屈肌和背屈肌自愿等距扭矩确定在踝关节角度为90，100，110和120度。根据扭矩和力臂测量值估计的峰值肌腱力，跖屈肌（3，623 +/- 136 N）比背屈肌（832 +/- 19 N）高出四倍以上。对于跖屈肌和背屈肌组，PCSA分别比小腿最大围长水平的解剖横截面积高出约8倍和3倍。跖屈肌的平均肌肉体积和PCSA分别是背屈肌的4.6倍和12倍。跖屈肌（r = 0.92）和背屈肌（r = 0.80）的PCSA与各自肌肉群的肌腱张力高度相关。背屈肌的最大比张力是跖屈肌的两倍多。这些数据表明，PCSA以外的因素有助于人类踝跖屈肌和背屈肌的力输出潜力。
Reported specific tension measurements for human skeletal muscle vary widely. This variability could be due, at least in part, to the determination of the physiological cross-sectional area (PCSA) of the muscles. In the present study, serial magnetic resonance images were taken every 10 mm along the lower leg of 8 male subjects to calculate the volume and subsequently the PCSAs of the individual muscles producing plantar flexor and dorsiflexor torques. Maximum plantar flexor and dorsiflexor voluntary isometric torques were determined at ankle joint angles of 90, 100, 110, and 120 degrees. Peak tendon force estimated from torque and moment arm measurements was more than fourfold higher in the plantar flexors (3,623 +/- 136 N) than in the dorsiflexors (832 +/- 19 N). PCSAs were about eight- and threefold higher than the anatomic cross-sectional areas at the level of maximum girth of the calf for the plantar flexor and dorsiflexor groups, respectively. Mean muscle volume and PCSA were 4.6 and 12 times larger in the plantar flexors compared with the dorsiflexors, respectively. The PCSAs of both plantar flexors (r = 0.92) and dorsiflexors (r = 0.80) were highly correlated with the tendon tension of the respective muscle groups. The maximum specific tension was more than twofold higher in dorsiflexors than in plantar flexors. These data suggest that factors other than PCSA contribute to the force output potential of ankle plantar flexors and dorsiflexors in humans.