Duarte João P, Valente-Dos-Santos João, Costa Daniela, Coelho-E-Silva Manuel J, Deprez Dieter, Philippaerts Renaat, Lenoir Matthieu, Vaeyens Roel, Malina Robert M
a Research Unity for Sport and Physical Activity (CIDAF, UID/DTP/04213/2016) , University of Coimbra , Coimbra , Portugal.
b Faculty of Sport Sciences and Physical Education , University of Coimbra , Coimbra , Portugal.
Ann Hum Biol. 2018 Aug;45(5):453-456. doi: 10.1080/03014460.2018.1521470. Epub 2018 Oct 31.
The purpose of the study was to model the longitudinal development of knee extension (KE) and flexion (KF) strength in adolescent soccer players. A mixed-longitudinal sample composed of 67 soccer players aged 11.0-13.9 years at baseline was followed on three-to-five occasions over 5 years. Stature, body mass and several skinfold thicknesses were measured. Fat mass was estimated from skinfolds and fat-free mass (FFM) derived. Skeletal age was estimated with the TW2-RUS protocol. An isokinetic dynamometer was used to obtain peak torque of KE and KF from concentric assessments at an angular velocity of 180°/s. Multilevel random effects regression analyses were performed. Among youth soccer players aged 11-16 years, isokinetic strength of the knee muscle groups was reasonably predicted from chronological age (CA), stature and FFM: KE = -66.170 + 5.353 × (CA) + 0.594 × (CA) + 0.552 × (stature) + 1.414 × (FFM), and KF = -9.356 + 2.708 × (CA) + 1.552 × (FFM). In conclusion, CA per se accounted for annual increments of 5.4 Nm in KE and 2.7 Nm in KF.
本研究的目的是对青少年足球运动员膝关节伸展（KE）和屈曲（KF）力量的纵向发展进行建模。一个由67名基线年龄在11.0 - 13.9岁的足球运动员组成的混合纵向样本，在5年时间里接受了三到五次随访。测量了身高、体重和多处皮褶厚度。根据皮褶厚度估算脂肪量，并得出去脂体重（FFM）。采用TW2-RUS方法估算骨龄。使用等速测力计在180°/s的角速度下通过向心评估获得KE和KF的峰值扭矩。进行了多水平随机效应回归分析。在11 - 16岁的青少年足球运动员中，根据实足年龄（CA）、身高和FFM可以合理预测膝关节肌肉群的等速力量：KE = -66.170 + 5.353×（CA）+ 0.594×（CA）+ 0.552×（身高）+ 1.414×（FFM），KF = -9.356 + 2.708×（CA）+ 1.552×（FFM）。总之，CA本身分别解释了KE每年增加5.4 Nm和KF每年增加2.7 Nm的原因。
