Role of the unperturbed limb and arms in the reactive recovery response to an unexpected slip during locomotion
Role of the unperturbed limb and arms in the reactive recovery response to an unexpected slip during locomotion
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DOI：
10.1152/jn.00683.2002
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发表时间：
2003-04-01
影响因子：
2.5
通讯作者：
Patla, AE
中科院分区：
文献类型：
--
作者：
Marigold, DS;Bethune, AJ;Patla, AE
了解对滑倒的反应性恢复反应是跌倒研究和预防的基础。本研究的主要目的是调查未受干扰的肢体和手臂在意外滑倒的反应性恢复反应中的作用。十名健康的年轻人参加了这项实验，其中一组钢制自由轮滚轮引发了意外的滑动。从未受干扰的肢体（即摆动肢）股直肌、股二头肌、胫骨前肌、腓肠肌内侧头、双侧臀中肌、竖脊肌和三角肌收集表面肌电图 (EMG) 数据。光学成像系统还收集运动学数据以监测肢体轨迹。第一次滑倒反应与随后对意外滑倒的恢复反应明显不同，具有可识别的反应性恢复反应，并且肌电图模式没有主动变化。未受干扰的肢体、上半身和手臂的肌肉在与之前发现的受干扰肢体相同的潜伏期中被募集。手臂抬高策略有助于重心因滑动而向后移位后向前移动，而未受干扰的肢体肌肉组织则表现出伸肌策略，支持观察到的肢体降低，短暂接触地面，以扩大支撑基础并增加稳定性。显然，中枢神经系统采用动态多肢协调策略来控制和协调上肢和下肢，以对运动过程中意外滑动做出反应性恢复反应。
Understanding reactive recovery responses to slipping is fundamental in falls research and prevention. The primary purpose of this study was to investigate the role of the unperturbed limb and arms in the reactive recovery response to an unexpected slip. Ten healthy, young adults participated in this experiment in which an unexpected slip was induced by a set of steel free-wheeling rollers. Surface electromyography (EMG) data were collected from the unperturbed limb (i.e., the swing limb) rectus femoris, biceps femoris, tibialis anterior, and the medial head of gastrocnemius, and bilateral gluteus medius, erector spinae, and deltoids. Kinematic data were also collected by an optical imaging system to monitor limb trajectories. The first slip response was significantly different from the subsequent recovery responses to the unexpected slips, with an identifiable reactive recovery response and no proactive changes in EMG patterns. The muscles of the unperturbed limb, upper body, and arms were recruited at the same latency as those previously found for the perturbed limb. The arm elevation strategies assisted in shifting the center of mass forward after it was posteriorly displaced with the slip, while the unperturbed limb musculature demonstrated an extensor strategy supporting the observed lowering of the limb to briefly touch the ground to widen the base of support and to increase stability. Evidently a dynamic multi-limb coordinated strategy is employed by the CNS to control and coordinate the upper and lower limbs in reactive recovery responses to unexpected slips during locomotion.