School of Physical Education, Physiotherapy and Dance, Exercise Research Laboratory, Universidade Federal Do Rio Grande Do Sul, Porto Alegre, Rio Grande Do Sul, Brazil.
Biomechanics Laboratory, Center of Sports, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.
BMC Pediatr. 2024 Nov 29;24(1):784. doi: 10.1186/s12887-024-05168-1.
The rate of torque development (RTD) has been associated with sports performance and can be improved during the biological maturation process of young soccer players. The aim of this study was to compare the effects of maturity status on the knee extensors' RTD of soccer players after appropriate normalization.
Twenty-seven young male soccer players aged 13-18 years old were allocated into two groups: pubescent (PUB, n = 11) and postpubescent (POSP, n = 16). RTD was obtained by performing a maximum voluntary isometric contraction at six different knee joint angles (30º, 45º, 60º, 75º, 90º, and 105º). Anthropometric (height and body mass) and muscle architecture variables (muscle thickness, muscle volume, fascicle length, pennation angle, and cross-section area) were evaluated as body size descriptors and used to identify the best way for appropriate normalization of RTD data.
Muscle architecture variables showed no correlations with RTD (p > 0.05), while body mass showed a positive correlation (0.405 < r < 0.680; p < 0.05). Maturity status showed positive effects on absolute late RTD values (N·m·s) obtained at four different angles (60º, 75º, 90º, and 105º). However, maturity status showed no effects on RTD values after normalization by body mass (N·m·s·kg).
Maturity status showed no positive effects on RTD values after appropriate normalization by body mass in young soccer players.
扭矩发展率（RTD）与运动表现有关，并且可以在年轻足球运动员的生物学成熟过程中得到提高。本研究的目的是比较成熟度对适当归一化后足球运动员伸膝肌 RTD 的影响。
将 27 名年龄在 13-18 岁的年轻男性足球运动员分为两组：青春期（PUB，n=11）和青春期后（POSP，n=16）。通过在六个不同的膝关节角度（30°、45°、60°、75°、90°和 105°）下进行最大等长自愿收缩来获得 RTD。评估人体测量学（身高和体重）和肌肉结构变量（肌肉厚度、肌肉体积、肌束长度、羽状角和横截面积）作为身体尺寸描述符，并用于确定适当归一化 RTD 数据的最佳方法。
肌肉结构变量与 RTD 没有相关性（p>0.05），而体重与 RTD 呈正相关（0.405<r<0.680；p<0.05）。成熟度对四个不同角度（60°、75°、90°和 105°）获得的绝对后期 RTD 值（N·m·s）有积极影响。然而，成熟度对体重归一化后的 RTD 值没有影响（N·m·s·kg）。
在适当的体重归一化后，成熟度对年轻足球运动员的 RTD 值没有积极影响。
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