Activity modulations of trunk and lower limb muscles during impact-absorbing landing
Activity modulations of trunk and lower limb muscles during impact-absorbing landing
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DOI：
10.1016/j.jelekin.2011.04.001
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发表时间：
2011-08-01
影响因子：
2.5
通讯作者：
Nakazawa, Kimitaka
中科院分区：
文献类型：
--
作者：
Iida, Yoshiaki;Kanehisa, Hiroaki;Nakazawa, Kimitaka
本研究旨在探讨人体躯干及下肢肌肉在缓冲著陆时的活动模式。17名受试者从35 cm高度进行10次落地，测量躯干和下肢肌肉沿着的肌电活动以及运动学和地面反作用力。着陆运动分为三个阶段：地面接触（GC）前100 ms（PRE阶段），从GC到100 ms（吸收阶段），以及从吸收阶段结束直到质心垂直位置最小化（制动阶段）。在PRE阶段，腹直肌，腹外斜肌和内侧腓肠肌高度激活。GC时，髋关节和膝关节处于屈曲位置;踝关节处于跖屈位置。GC后，肌肉活动和下肢关节旋转的峰值时间的特点是由远端到近端的顺序模式。吸收阶段相对于体重的峰值垂直地面反作用力与PRE阶段股外侧肌和臀大肌的活动水平以及吸收阶段腹直肌的活动水平呈正相关。这些结果表明，躯干和下肢肌肉活动的强度和峰值时间是协调的，以吸收着陆冲击。(C)2011爱思唯尔有限公司保留所有权利。
This study aimed to investigate the activity patterns of trunk and lower limb muscles during impact-absorbing landing. Electromyogram activities of the trunk and lower limb muscles along with kinematic and ground reaction forces were measured while subjects (n = 17) performed 10 landings from a height of 35 cm. Landing motions were divided into three phases: 100 ms preceding ground contact (GC) (PRE phase), from GC through 100 ms (ABSORPTION phase), and from the end of the ABSORPTION phase until the vertical position of the center of mass was minimized (BRAKING phase). During the PRE phase, the rectus abdominis, external oblique, and medial gastrocnemius were highly activated. Upon GC, the hip and knee joints were in a flexed position; the ankle joints, in a plantarflexed position. After GC, peak timings of muscle activities and lower limb joint rotations were characterized by distal-to-proximal sequential patterns. The peak vertical ground reaction force in the ABSORPTION phase relative to body weight positively correlated with the activity levels of the vastus lateralis and gluteus maximus in the PRE phase and that of rectus abdominis in the ABSORPTION phase. These findings indicate that the intensities and peak timings of muscle activities in the trunk and lower limb are coordinated to absorb landing impact. (C) 2011 Elsevier Ltd. All rights reserved.