Variability of Limb Muscle Size in Young Men
Variability of Limb Muscle Size in Young Men
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DOI：
10.1002/ajhb.20951
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发表时间：
2010-01-01
影响因子：
2.9
通讯作者：
Fukunaga, Tetsuo
中科院分区：
文献类型：
--
作者：
Wakahara, Taku;Takeshita, Kazumi;Fukunaga, Tetsuo
本研究的目的是确定青年男性上肢和下肢肌肉大小的个体间变异性。受试者为655名年龄在18-39岁的日本男性。他们是久坐不动的，轻度到高度活跃的人，包括各种运动的大学运动员。使用B型超声测量上臂、大腿和小腿的前部和后部的肌肉厚度。用变异系数（CV）评价肌肉厚度的个体间变异性。肌肉厚度变异系数依次为上臂后（17.7%）、大腿前（14.8%）、大腿后（12.6%）、上臂前（12.2%）、小腿前（9.8%）、小腿后（9.4%）。除上臂前-股后和小腿前-后外，每对测量部位之间的CV均存在显著差异。即使将肌肉厚度归一化为节段长度，这些差异仍然显著。所观察到的大小变异性的差异可以解释为肌肉相关的差异，肥大反应阻力训练。肌肉依赖性大小变异性可能与所检查的肌肉群之间的纤维类型组成和/或日常生活中肌肉使用的差异有关。Am. J. 22：55-59，2010. (C)2009 Wiley-Liss，Inc.
The purpose of this study was to determine the interindividual variability of the upper and lower limb muscle size in young men. Subjects were 655 Japanese men aged 18-39 years. They were sedentary and mildly to highly active individuals, including college athletes of various sports. Muscle thicknesses at each of the anterior and posterior portions of the upper arm, thigh, and lower leg were measured using B-mode ultrasonography. Interindividual variability of muscle thickness was evaluated by coefficients of variation (CVs). The CVs of muscle thicknesses were found to be in the order of upper arm posterior (17.7%), thigh anterior (14.8%), thigh posterior (12.6%), upper arm anterior (12.2%), lower leg anterior (9.8%), and lower leg posterior (9.4%). The CVs were significantly different between each pair of measurement sites except for those of upper arm anterior-thigh posterior and lower leg anterior-posterior. These differences remain significant even when the muscle thicknesses were normalized to the segment length. The observed differences in the size variability can be interpreted as muscle-related differences in hypertrophic responsiveness to resistance training. The muscle-dependent size variability may be related to the differences in the fiber-type composition and/or muscle usage in daily life among examined muscle groups. Am. J. Hum. Biol. 22:55-59, 2010. (C) 2009 Wiley-Liss, Inc.