Wood Louise E, Dixon Sharon, Grant Chris, Armstrong Neil
Department of Sport and Exercise Science, University of Portsmouth, St. Michael's Building, White Swan Road, Portsmouth, PO1 2DT, UK.
School of Sport and Health Sciences, University of Exeter, Exeter, EX1 2LU, UK.
Pediatr Exerc Sci. 2006 Nov;18(4):457-469. doi: 10.1123/pes.18.4.457.
The aim of this study was to examine elbow flexion torque, muscle cross-sectional area (CSA), and leverage in boys and girls. Thirty-eight prepubertal children (9.6 ± 0.3 years) volunteered to participate. All performed isometric flexion actions at 10°, 50°, and 90° of elbow flexion. Magnetic resonance imaging was used to assess elbow flexor (EF) muscle CSA and brachialis moment arm lengths. No significant gender differences were observed for any of the variables studied. EF CSA was directly proportional to isometric torque at 50° and 90°. CSA explained between 47% and 57% of torque variance. Moment arm estimates explained 19% of the variance in isometric torque at 90°. These baseline data contribute to our understanding of factors influencing strength variation during childhood.
本研究的目的是检测男孩和女孩的肘部屈曲扭矩、肌肉横截面积（CSA）和杠杆作用。38名青春期前儿童（9.6±0.3岁）自愿参与。所有人都在肘部屈曲10°、50°和90°时进行等长屈曲动作。使用磁共振成像评估肘部屈肌（EF）肌肉CSA和肱肌力臂长度。在所研究的任何变量中均未观察到显著的性别差异。EF CSA与50°和90°时的等长扭矩成正比。CSA解释了47%至57%的扭矩变化。力臂估计解释了90°时等长扭矩变化的19%。这些基线数据有助于我们理解影响儿童时期力量变化的因素。
