Relationships between muscle size and hardness of the medial gastrocnemius at different ankle joint angles in young men
Relationships between muscle size and hardness of the medial gastrocnemius at different ankle joint angles in young men
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DOI：
10.1258/ar.2011.110481
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发表时间：
2012-04-01
期刊：
影响因子：
1.3
通讯作者：
Takahashi, Hideyuki
中科院分区：
文献类型：
--
作者：
Akagi, Ryota;Chino, Kentaro;Takahashi, Hideyuki
背景：肌肉硬度的测量对于客观评价肌肉状况是重要的。肌肉硬度可能与肌肉的大小，但这种关系尚未被examined.Purpose：检查内侧腓肠肌（MG）在不同的踝关节angle.Material和方法的大小和硬度之间的关系：12名年轻男性受试者组成了本study。通过超声测量右侧MG的肌肉厚度（MTMG）作为肌肉大小的指标。MTMG是在从腘动脉折痕到外踝的小腿长度的30%处确定的。在同一部位，用超声实时组织弹性成像测量右侧MG（MHMG）的肌肉硬度。这两个测量值都是在每个受试者被指示以俯卧位躺在测试台上时进行的。右脚踝通过非弹性带固定到手工装置上，髋关节和膝关节完全伸展，脚踝定位在+30度、0度和-20度（0度：中立位，正值表示跖屈）。在踝关节角度之间MTMG没有显著差异，而MHMG随着踝关节的移动而显著增加。跖屈到背屈结果，角度之间的MTMG-MHMG关系存在差异。MTMG与MHMG仅在+30 °处显著相关（r = 0.635，P < 0.05），在此位置处踝关节周围的被动扭矩在先前的研究中已被证明接近于零。
Background: Measurement of muscle hardness is important for objective evaluation of the muscle condition. Muscle hardness may be related to muscle size, but this relationship has not yet been examined.Purpose: To examine the relationship between the size and hardness of the medial gastrocnemius muscle (MG) at different ankle joint angles.Material and Methods: Twelve young male subjects comprised the present study. Muscle thickness of the right MG (MTMG) was measured by ultrasonography as an index of muscle size. The MTMG was determined at 30% of the lower leg length from the popliteal crease to the lateral malleolus. At the same site, muscle hardness of the right MG (MHMG) was measured with ultrasound real-time tissue elastography. Both measurements were taken while each subject was instructed to lie in a prone position on a test bench. The right ankle was secured to a handmade apparatus by a non-elastic belt, with the hip and knee joints fully extended and the ankle positioned at +30 degrees, 0 degrees and -20 degrees (0 degrees: neutral position, positive values indicating plantar flexion).Results: There were no significant differences in the MTMG among the ankle joint angles whereas the MHMG significantly increased as the ankle was moved from plantar flexion to dorsiflexion. As a result, there was a difference in the MTMG-MHMG relationship between the angles. The MTMG significantly correlated with the MHMG only at +30 degrees (r = 0.635, P < 0.05) where passive torque around the ankle has been shown to be near zero in previous studies.Conclusion: The hardness of the relaxed MG with no passive tension appears to depend on its size.