We studied the effect of pennate vs. fusiform muscle architecture on the rate of torque development (RTD) by examining the predominately fusiform elbow flexors (EF) and highly-pennate knee extensors (KE). Seventeen male volunteers (28.4 ± 6.2 years) performed explosive isometric EF and KE contractions (MVCs). Biceps brachii and vastus lateralis fascicle angles were measured to confirm their architecture, and both the rate of voluntary muscle activation (root-mean-square EMG in the 50 ms before contraction onset; EMG_-50) and electromechanical delay (EMD; depicting muscle-tendon series elasticity) were assessed as control variables to account for their influence on RTD. MVC torque, early (RTD₅₀) and late (RTD₂₀₀) RTDs were calculated and expressed as absolute and normalized values. Absolute MVC torque (+412%), RTD₅₀ (+215%), and RTD₂₀₀ (+427%) were significantly (p < 0.001) higher in KE than EF. However, EF RTD₅₀ was faster (+178%) than KE after normalization (p = 0.02). EMG_-50 and EMD did not differ between muscle groups. The results suggest that the faster absolute RTD in KE is largely associated with its higher maximal torque capacity, however in the absence of differences in rates of muscle activation, fiber type, and EMD the fusiform architecture of EF may be considered a factor allowing its faster early RTD relative to strength capacity.

我们通过检查主要为梭状肘屈肌 (EF) 和高度羽状膝伸肌 (KE) 来研究羽状与梭状肌肉结构对扭矩发展率 (RTD) 的影响。17 名男性志愿者 (28.4 ± 6.2 岁) 进行了爆炸性等长 EF 和 KE 收缩 (MVCs)。测量肱二头肌和股外侧肌束角以确认它们的结构，以及随意肌肉激活率（收缩开始前 50 毫秒的均方根 EMG；EMG _-50）和机电延迟（EMD；描绘肌肉 -肌腱系列弹性）被评估为控制变量，以解释它们对 RTD 的影响。MVC 扭矩，早期 (RTD ₅₀ ) 和晚期 (RTD ₂₀₀) RTD 被计算并表示为绝对值和归一化值。 KE 中的绝对 MVC 扭矩 (+412%)、RTD ₅₀ (+215%) 和 RTD ₂₀₀ (+427%) 显着高于 EF ( p < 0.001)。然而，标准化后EF RTD ₅₀比 KE 快 (+178%) ( p  = 0.02)。EMG _-50和 EMD 在肌肉群之间没有差异。结果表明 KE 中更快的绝对 RTD 在很大程度上与其更高的最大扭矩容量相关，但是在肌肉激活率、纤维类型和 EMD 没有差异的情况下，EF 的梭形结构可能被认为是允许其更快的一个因素相对于力量容量的早期 RTD。