Hip Flexor and Knee Extensor Muscularity Are Associated With Sprint Performance in Sprint-Trained Preadolescent Boys
Hip Flexor and Knee Extensor Muscularity Are Associated With Sprint Performance in Sprint-Trained Preadolescent Boys
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DOI：
10.1123/pes.2016-0226
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发表时间：
2018-02-01
影响因子：
1.8
通讯作者：
Isaka, Tadao
中科院分区：
文献类型：
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作者：
Tottori, Nobuaki;Suga, Tadashi;Isaka, Tadao
目的：研究男性青春期前短跑运动员躯干和下肢肌肉横截面积(CSA)与短跑成绩的关系。方法：15名接受短跑训练的青春期前男孩(年龄11.6+/-0.4岁)参加了这项研究。使用磁共振成像测量参与者躯干和下缘肌肉的CSA，并将这些肌肉与无脂肪质量归一化。为了评估参与者的冲刺表现，测量了50米冲刺测试中的冲刺时间和变量。通过对身高进行归一化处理，将短跑变量表示为其指标。结果：腰大肌、内收肌和股四头肌的相对CSA与冲刺时间显著相关(r=-.802、-.643和-.639)。此外，这些肌肉的相对CSA与冲刺速度指数(r=.694，r=.612和.630)和步频指数(r=.687，.740和.590)显著相关，但与步长指数无关。结论：这些发现表明，男性青春期前短跑运动员的髋屈肌和伸膝肌肉可能通过潜在地增加他们的力矩来帮助获得更好的短跑成绩，这可能是由于短跑过程中步频增加而不是步长增加所致。
Purpose: We attempted to determine the relationships between the cross-sectional area (CSA) of the trunk and lower limb muscles and sprint performance in male preadolescent sprinters. Methods: Fifteen sprint-trained preadolescent boys (age 11.6 +/- 0.4 y) participated in this study. The CSAs of the participants' trunk and lower limbmuscles were measured using magnetic resonance imaging, and these muscles were normalized with free-fat mass. To assess participants' sprint performance, sprint time and variables during the 50-m sprint test were measured. The sprint variables were expressed as their indices by normalizing with body height. Results: The relative CSAs of psoas major, adductors, and quadriceps femoris were significantly correlated with sprint time (r = -.802, -.643, and -.639). Moreover, the relative CSAs of these muscles were significantly correlated with indices of sprint velocity (r = .694, .612, and .630) and step frequency (r = .687, .740, and .590) but not with that of step length. Conclusions: These findings suggest that greater hip flexor and knee extensor muscularity in male preadolescent sprinters may help achieve superior sprint performance by potentially enhancing their moments, which may be induced by increased step frequency rather than step length during sprinting.