Gender differences in the passive stiffness of the human gastrocnemius muscle during stretch
Gender differences in the passive stiffness of the human gastrocnemius muscle during stretch
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DOI：
10.1007/s00421-011-1845-z
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发表时间：
2011-09-01
影响因子：
3
通讯作者：
Morse, Christopher I.
中科院分区：
文献类型：
--
作者：
Morse, Christopher I.
本研究的目的是确定体内测量的肌肉硬度是否在雄性和雌性之间存在差异。在8名男性和8名女性（年龄范围19-28岁）的被动背屈过程中，使用超声直接测量腓肠肌内侧肌腱连接的远端位移。以5度间隔测量跖屈扭矩和肌腱连接处位移，其中0度是足部与胫骨成直角。腓肠肌内侧肌的刚度在背屈0 °和25 °之间计算，并定义为被动跖屈扭矩/肌腱连接处的远端位移（N m cm（-1））。相对肌肉刚度也被计算为相对于静息肌肉长度的远端位移，以及相对于跖屈最大自主收缩扭矩的被动扭矩。在整个活动范围内，被动背屈扭矩或被动扭矩/最大随意扭矩没有观察到显著的性别差异。腓肠肌肌腱连接部远端移位女性比男性多26%（P < 0.05）。女性肌腱接头位移为静息腓肠肌内侧肌长度的5.0 +/- 1.4%，男性为3.9 +/- 0.6%。被动背屈25 °以上时，男性腓肠肌内侧肌僵硬度比女性大44%（P < 0.05）。总之，根据体内评估的肌腱接头位移，被动腓肠肌内侧肌肉刚度是男性比女性更大。
The aim of this study was to determine whether muscle stiffness measured in vivo was different between males and females. Distal displacement of the gastrocnemius medialis myotendinous junction was measured directly using ultrasonography during passive dorsiflexion in eight males and eight females (age range 19-28 years). Plantarflexion torque and myotendinous junction displacement were measured at 5 degrees intervals, where 0 degrees was with the foot at right angles to the tibia. Stiffness of the gastrocnemius medialis muscle was calculated between 0 degrees and 25 degrees of dorsiflexion, and defined as passive plantarflexion torque/distal displacement of the myotendinous junction (N m cm(-1)). Relative muscle stiffness was also calculated as distal displacement relative to resting muscle length, and as passive torque relative to plantarflexion maximal voluntary contraction torque. No significant gender difference was observed in passive dorsiflexion torque, or in passive torque/maximal voluntary torque throughout the range of motion. Distal displacement of the gastrocnemius myotendinous junction was 26% more in females than in males (P < 0.05). Myotendinous junction displacement was 5.0 +/- 1.4% of resting gastrocnemius medialis length in females, and 3.9 +/- 0.6% in males. Over 25 degrees of passive dorsiflexion, gastrocnemius medialis muscle stiffness was greater in males than in females by 44% (P < 0.05). In conclusion, based on the in vivo assessment of myotendinous junction displacement, passive gastrocnemius medialis muscle stiffness is greater in males than in females.