Mechanical and physiological responses to stretching with and without preisometric contraction in human skeletal muscle
Mechanical and physiological responses to stretching with and without preisometric contraction in human skeletal muscle
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DOI：
10.1016/s0003-9993(96)90087-8
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发表时间：
1996-04-01
影响因子：
4.3
通讯作者：
Kjaer, M
中科院分区：
文献类型：
--
作者：
Magnusson, SP;Simonsen, EB;Kjaer, M
目的：检查静态拉伸和收缩放松拉伸期间的肌电图 (EMG) 活动、被动扭矩和拉伸感知。设计：两个独立的随机交叉方案：(1) 右侧恒定角度方案，(2) 左侧可变角度方案。受试者：10 名男性志愿者。干预：在被动膝关节伸展过程中，将拉伸引起的腿筋肌肉机械反应测量为膝关节屈曲扭矩 (Nm)，同时测量腿筋表面肌电图。最终位置是通过将膝盖延伸到引起类似于伸展动作的感觉的角度来确定的。等角拉伸：膝盖伸展至最终位置下方10度，保持10秒，然后伸展至最终位置并保持80秒。变角度拉伸：将膝盖从起始位置伸展到最终位置下方10度，保持10秒，然后伸展到疼痛发生时。在收缩-放松拉伸中，受试者产生 6 秒的等长收缩，腘绳肌在最终位置下方 10 度，但在静态拉伸中则不然。主要结果指标：连续记录被动扭矩、关节活动范围、速度和腘绳肌肌电图。结果：恒定角度收缩-放松和静态拉伸在被动扭矩或肌电图反应上没有差异。在最终位置，收缩松弛和静态拉伸时的被动扭矩均下降 18% 至 21% (p < .001)，而 EMG 活动则保持不变。在可变角度方案中，与静态拉伸相比，收缩放松时的最大关节角度和相应的被动扭矩显着更大 (p < .01)，而 EMG 没有差异。结论：在恒定角度下，粘弹性和 EMG 响应不受等长收缩的影响。可变角度方案表明 PNF 拉伸改变了拉伸感知。 (C) 1996 年由美国康复医学会和美国物理医学与康复学会
Objective: To examine electromyography (EMG) activity, passive torque, and stretch perception during static stretch and contract-relax stretch.Design: Two separate randomized crossover protocols: (1) a constant angle protocol on the right side, and (2) a variable angle protocol on the left side.Subjects: 10 male volunteers.Intervention: Stretch-induced mechanical response in the hamstring muscles during passive knee extension was measured as knee flexion torque (Nm) while hamstring surface EMG was measured. Final position was determined by extending the knee to an angle that provoked a sensation similar to a stretch maneuver. Constant angle stretch: The knee was extended to 10 degrees below final position, held 10sec, then extended to the final position and held for 80sec. Variable angle stretch: The knee was extended from the starting position to 10 degrees below the final position, held 10sec, then extended to the onset of pain. Subjects produced a 6-sec isometric contraction with the hamstring muscles 10 degrees below the final position in the contract-relax stretch, but not in the static stretch.Main Outcome Measures: Passive torque, joint range of motion, velocity, and hamstring EMG were continuously recorded.Results: Constant angle contract-relax and static stretch did not differ in passive torque or EMG response. In the final position, passive torque declined 18% to 21% in both contract-relax and static stretch (p < .001), while EMG activity was unchanged. In the variable angle protocol, maximal joint angle and corresponding passive torque were significantly greater in contract-relax compared with static stretch (p < .01), while EMG did not differ.Conclusion: At a constant angle the viscoelastic and EMG response was unaffected by the isometric contraction. The variable angle protocol demonstrated that PNF stretching altered stretch perception. (C) 1996 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation