The aim of the study was to investigate the relationships between vastus lateralis muscle fiber length and fiber type composition in individuals with minimal exposure to systematic resistance/power training. In sixty female physical education students (age: 21.03 ± 2.1 years, body weight: 59.8 ± 9.7 kg, body height: 166.2 ± 6.5 cm), with no experience in systematic training, lean body mass, VL muscle architecture and fiber composition type, countermovement jumping (CMJ) performance, and isometric leg press rate of force development were evaluated. Data were analyzed for all participants, as well as two equally numbered groups assigned according to their maximum countermovement jumping power (High-Power or Low-Power group). Significant but low correlations were found between type II muscle fiber percentage and fascicle length (N = 60, p < 0.05). Significant correlations were found between type IIa and IIx muscle fiber percentage cross-sectional area (%CSA) and fascicle length (N = 60; r = 0.321, and r = 0.378; respectively, p < 0.05). These correlations were higher for the High-Power group (r = 0.499, and r = 0.522; respectively, p < 0.05), and lower, and nonsignificant, for the Low-Power group. The best predictor of strength/power performance was the lean body mass of the lower extremities (r = 0.389–0.645, p < 0.05). These results suggest that in females with minimal exposure to systematic training, fascicle length may be weakly linked with type II fiber areas, only in females with high-power profiles.

中文翻译：

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未经训练的年轻女性股外侧肌纤维组成与肌束长度之间的关联性较弱


该研究的目的是调查很少接受系统阻力/力量训练的个体股外侧肌纤维长度和纤维类型组成之间的关系。 60名女体育生（年龄：21.03±2.1岁，体重：59.8±9.7公斤，身高：166.2±6.5厘米），没有系统训练经验，去脂体重、VL肌肉结构和纤维成分类型，评估了反向运动跳跃（CMJ）表现和等距腿部推举发力率。对所有参与者以及根据其最大反向运动跳跃能力分配的两个相同编号的组（高功率组或低功率组）进行了数据分析。 II 型肌纤维百分比与肌束长度之间存在显着但较低的相关性（N = 60， p < 0.05）。 IIa 型和 IIx 型肌纤维横截面积百分比 (%CSA) 与肌束长度之间存在显着相关性（N = 60；r = 0.321 和 r = 0.378；分别为p < 0.05）。高功率组的这些相关性较高（r = 0.499 和 r = 0.522；分别为p < 0.05），低功率组的相关性较低且不显着。力量/爆发力表现的最佳预测指标是下肢的去脂体重（r = 0.389–0.645， p < 0.05）。这些结果表明，在接受系统训练最少的女性中，束长度可能与 II 型纤维区域的相关性较弱，仅在具有高功率分布的女性中。