协调的肢体运动是人体主动肌肉力矩与被动力矩之间通过复杂的反馈与交互作用实现的，其中互动力矩在高速运动中对神经肌肉系统的控制有着重要影响。决定互动力矩的因素主要包括运动速度和肢体惯性特征。本研究同步采集我国优秀短跑运动员高速跑过程中运动学和动力学数据，建立环节互动动力学模型，分析速度与惯性特征改变后，互动力矩对肢体动力学与神经肌肉系统控制的影响（包括运动幅度/速度、主/被动力矩及其关系、损耗函数等），同时配合肌电图分析相应肌肉的神经支配特性与协调变化关系(包括募集时序、强度、频率、肌内/间协调等)，在了解人体神经肌肉系统基本功能的前提下，深入理解该系统如何通过调控主动肌力矩来应对发生变化的被动力矩，从而更加系统地认识人体神经肌肉的控制及协调机理。此外，跖趾关节在短跑支撑期的作用也是本研究创新的考察项目。在综合上述研究的基础上，探讨改进训练模式，创新训练方法，并最终达到提升短跑运动成绩的目标。

Coordination of limb movements is achieved by a complex interaction between the active muscle torque and passive torques. Interactive torque, which is determined by inertia properties and movement speed, plays a very important role in this process. This study will investigate the influence of interactive torque on the neuromuscular control under the conditions of the changes in the leg inertia properties during maximum/sub-maximum speed sprinting. Kinematics and kinetics data are acquired to 1) establish a four-joint intersegmental dynamic model and 2) quantify motor control index (including locomotorrange/velocity, active muscle torque/passive torques, cost functions, etc.). Electromyographic data are collected simultaneously to analyze the innervation pattern and the neural control/coordination within a gait cycle of sprinting (including the timing, intensity, firing rate, inter-/intramuscular coordination, etc.). Based on the fundamental functions of the neuromuscluar system, the underlying neuromuscular control strategy of multi-joint movement will be explored. An additional research on the functions of metatarsophalangeal joint during the support stage of sprinting will also be investigated. The findings of this study would be used to improve the sport coaching status, to develop the training methods, and ultimately to achieve the goal of enhancing sprinting performance.