Department of Life Sciences (Sports Sciences), University of Tokyo, Tokyo, Japan.
J Strength Cond Res. 2010 Jun;24(6):1472-9. doi: 10.1519/JSC.0b013e3181d32eb1.
The present study aimed to examine the influence of lateral dominance for ball kicking on the cross-sectional areas (CSAs) of thigh and trunk muscles in Japanese elite youth and professional soccer players, and to clarify the difference between the 2 groups in the muscle CSAs of the 2 body segments in relation to that in lean body mass (LBM). The CSAs of 4 (rectus abdominis, oblique, psoas major, and erector spinae) and 3 (quadriceps femoris, hamstrings, and adductors) muscle groups located in the trunk and thigh, respectively, were determined in 18 youth players (16.8+/-0.6 years) and 17 professional players (23.7+/-3.1 years) using magnetic resonance imaging. In youth and professional players, no significant effect of lateral dominance was found in the CSA of any muscle group. In all muscle groups except for the erector spinae, the CSAs were significantly greater in the professional players than in the youth players. The CSA of every muscle group was significantly correlated to the two-thirds power of LBM (LBM). In terms of the ratio of CSA to LBM, only the psoas major was significantly greater in the professionals. In conclusion, Japanese youth and professional soccer players did not exhibit bilateral asymmetry in the CSAs of thigh and trunk muscles, and the professional players had more developed psoas major muscle as compared with youth players even when matched for whole-body lean tissue mass. The current results suggest that for soccer players with bilateral asymmetry in the muscularity of the thighs and trunk, personalized strength programs for developing symmetry are recommended, and exercises involving hip flexion should be incorporated progressively into individual strength and conditioning programs.
本研究旨在探讨日本青年和职业足球运动员踢球的侧向优势对大腿和躯干肌肉横截面积（CSA）的影响，并阐明 2 组运动员在 2 个体段的肌肉 CSA 与瘦体重（LBM）的差异。使用磁共振成像（MRI）分别确定了 18 名青年运动员（16.8±0.6 岁）和 17 名职业运动员（23.7±3.1 岁）的 4 个（腹直肌、斜肌、腰大肌和竖脊肌）和 3 个（股四头肌、腘绳肌和内收肌）位于躯干和大腿的肌肉群的 CSA。在青年和职业运动员中，没有发现任何肌肉群的 CSA 存在侧向优势的显著影响。在所有肌肉群中，除了竖脊肌外，职业运动员的 CSA 都明显大于青年运动员。除了竖脊肌外，所有肌肉群的 CSA 均与 LBM 的三分之二次方（LBM）呈显著正相关。在 CSA 与 LBM 的比值方面，只有腰大肌在职业运动员中显著更大。总之，日本青年和职业足球运动员的大腿和躯干肌肉 CSA 没有表现出双侧不对称性，与青年运动员相比，职业运动员的腰大肌更为发达，即使在匹配全身瘦体重的情况下也是如此。目前的结果表明，对于大腿和躯干肌肉发达程度存在双侧不对称的足球运动员，建议制定个性化的力量训练计划来发展对称性，并且应该逐渐将涉及髋关节屈曲的练习纳入到个人的力量和体能训练计划中。
