Center of Sports Training and Rehabilitation, Department of Rehabilitation Sciences.
Department of Rehabilitation Sciences, The Hong Kong Polytechnic University , Hung Hom, Hong Kong.
J Sports Sci Med. 2014 Jan 20;13(1):30-5. eCollection 2014 Jan.
The acute effect of whole-body vibration (WBV) training may enhance muscular performance via neural potentiation of the stretch reflex. The purpose of this study was to investigate if acute WBV exposure affects the stretch induced knee jerk reflex [onset latency and electromechanical delay (EMD)] and the isokinetic knee extensor peak torque performance. Twenty-two subjects were randomly assigned to the intervention or control group. The intervention group received WBV in a semi-squat position at 30° knee flexion with an amplitude of 0.69 mm, frequency of 45 Hz, and peak acceleration of 27.6 m/s(2) for 3 minutes. The control group underwent the same semii-squatting position statically without exposure of WBV. Two-way mixed repeated measures analysis of variance revealed no significant group effects differences on reflex latency of rectus femoris (RF) and vastus lateralis (VL; p = 0.934 and 0.935, respectively) EMD of RF and VL (p = 0.474 and 0.551, respectively) and peak torque production (p = 0.483) measured before and after the WBV. The results of this study indicate that a single session of WBV exposure has no potentiation effect on the stretch induced reflex and peak torque performance in healthy young adults. Key PointsThere is no acute potentiation of stretch reflex right after whole body vibration.Acute whole body vibration does not improve mus-cle peak torque performance in healthy young adults.
全身振动（WBV）训练的急性效应可能通过伸展反射的神经增强来提高肌肉表现。本研究的目的是调查急性 WBV 暴露是否会影响伸展引起的膝反射[起始潜伏期和机电延迟（EMD）]和等速膝关节伸肌峰值扭矩性能。22 名受试者被随机分配到干预组或对照组。干预组以 30°膝关节屈曲的半蹲姿势接受 WBV，振幅为 0.69mm，频率为 45Hz，峰值加速度为 27.6m/s(2)，持续 3 分钟。对照组在不暴露于 WBV 的情况下以相同的半蹲姿势静态进行。双向混合重复测量方差分析显示，RF 和 VL 的反射潜伏期（RF 和 VL；p=0.934 和 0.935）、RF 和 VL 的 EMD（p=0.474 和 0.551）以及峰值扭矩产生（p=0.483）在 WBV 前后均无显著的组间差异。本研究的结果表明，单次 WBV 暴露对健康年轻成年人的伸展反射和峰值扭矩性能没有增强作用。关键点全身振动后即刻没有伸展反射的急性增强作用。急性全身振动不能改善健康年轻成年人的肌肉峰值扭矩性能。
