Tottori Nobuaki, Suga Tadashi, Isaka Tadao, Fujita Satoshi
Ritsumeikan University.
Res Q Exerc Sport. 2022 Dec;93(4):781-787. doi: 10.1080/02701367.2021.1919593. Epub 2021 Nov 1.
We previously reported that the cross-sectional area of the quadriceps femoris is correlated with the sprint performance of preadolescent sprinters. This finding suggests a close relationship between knee extensor torque-enhancing morphology and sprint performance in this young population. To further clarify this issue, in this study, we examined the relationships of the quadriceps femoris muscle volume (MV) and knee extensor moment arm (MA) with sprint performance in preadolescent sprinters. The quadriceps femoris MV and knee extensor MA in 15 sprint-trained preadolescent boys were measured using magnetic resonance imaging. Sprint performance was evaluated using a personal best 100-m sprint time and the higher 50-m sprint velocity of two 50-m sprint tests. The quadriceps femoris MV and knee extensor MA were significantly correlated with personal best 100-m sprint time ( = -0.810 and -0.752, ≤ 0.001 for both) and 50-m sprint velocity ( = 0.814 and 0.702, < .01 for both). Furthermore, the relative quadriceps femoris MV normalized to body mass was significantly correlated with both the personal best 100-m sprint time ( = -0.620, = .014) and 50-m sprint velocity ( = 0.686, = .005). In contrast, no significant correlations were observed between the relative knee extensor MA normalized to body height and both sprint performance parameters. These findings suggest that the quadriceps femoris size, rather than the knee extensor MA dimension, is a more important morphological factor for achieving superior sprint performance in preadolescent sprinters.
我们之前报道过，股四头肌的横截面积与青春期前短跑运动员的短跑成绩相关。这一发现表明，在这个年轻人群中，增强膝关节伸肌扭矩的形态与短跑成绩之间存在密切关系。为了进一步阐明这个问题，在本研究中，我们研究了青春期前短跑运动员的股四头肌肌肉体积（MV）和膝关节伸肌力矩臂（MA）与短跑成绩的关系。使用磁共振成像测量了15名经过短跑训练的青春期前男孩的股四头肌MV和膝关节伸肌MA。使用个人最佳100米短跑时间以及两次50米短跑测试中较高的50米短跑速度来评估短跑成绩。股四头肌MV和膝关节伸肌MA与个人最佳100米短跑时间显著相关（分别为r = -0.810和-0.752，两者P≤0.001）以及50米短跑速度（分别为r = 0.814和0.702，两者P < 0.01）。此外，归一化至体重的股四头肌相对MV与个人最佳100米短跑时间（r = -0.620，P = 0.014）和50米短跑速度（r = 0.686，P = 0.005）均显著相关。相比之下，归一化至身高的膝关节伸肌相对MA与两个短跑成绩参数之间均未观察到显著相关性。这些发现表明，对于青春期前短跑运动员取得优异的短跑成绩而言，股四头肌的大小比膝关节伸肌MA的尺寸是更重要的形态学因素。
