Wang Meizi, Fu Lin, Gu Yaodong, Mei Qichang, Fu Fengqin, Fernandez Justin
Faculty of Sports Science, Ningbo University, Ningbo, China.
Department of Engineering Science, University of Auckland, Auckland, New Zealand.
J Hum Kinet. 2018 Oct 15;64:25-33. doi: 10.1515/hukin-2017-0182. eCollection 2018 Sep.
This study investigated differences of lower limb kinematics and muscle activity during table tennis topspin loop against backspin movements between elite players (EPs) and amateur players (APs). Ten EPs and ten APs performed crosscourt backhand loop movements against the backspin ball with maximal power. Vicon motion analysis and a MEGA ME6000 system was used to capture kinematics and surface EMG data. The motion was divided into two phases, including the backswing and swing. The joints' flexion and extension angle tendency between EPs and APs differed significantly. The coefficient of multiple correlation (CMC) values for EPs were all beyond 0.9, indicating high similarity of joint angles change. APs presented moderate similarity with CMC values from 0.5 to 0.75. Compared to APs, EPs presented larger ankle eversion, knee and hip flexion at the beginning moment of the backswing. In the sEMG test, EPs presented smaller standardized AEMG (average electromyography) of the lower limb muscles in the rectus femoris and tibia anterior on both sides. Additionally, the maximum activation of each muscle for EPs was smaller and MPF (mean power frequency) of the lower limb was greater during the whole movement. The present study revealed that EPs could complete this technical motion more economically than APs, meanwhile, EPs were more efficient in muscle usage and showed better balance ability.
本研究调查了精英球员（EPs）和业余球员（APs）在乒乓球正手加转弧圈球回击下旋球动作过程中下肢运动学和肌肉活动的差异。十名精英球员和十名业余球员以最大力量进行了横拍反手弧圈球回击下旋球的动作。使用Vicon运动分析系统和MEGA ME6000系统采集运动学和表面肌电图数据。该动作分为两个阶段，包括引拍和挥拍。精英球员和业余球员之间关节的屈伸角度趋势存在显著差异。精英球员的多重相关系数（CMC）值均超过0.9，表明关节角度变化的高度相似性。业余球员的CMC值在0.5至0.75之间，呈现出中等相似性。与业余球员相比，精英球员在引拍起始时刻表现出更大的踝关节外翻、膝关节和髋关节屈曲。在表面肌电图测试中，精英球员两侧股直肌和胫骨前肌的下肢肌肉标准化平均肌电图（AEMG）较小。此外，在整个运动过程中，精英球员各肌肉的最大激活程度较小，下肢的平均功率频率（MPF）较大。本研究表明，精英球员比业余球员能更经济地完成这一技术动作，同时，精英球员在肌肉使用方面更高效，且表现出更好的平衡能力。
