title: Acute Whole-Body Vibration does not Facilitate Peak Torque and Stretch Reflex in Healthy Adults.
abstract: 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.
authors.affiliation: Center of Sports Training and Rehabilitation, Department of Rehabilitation Sciences.
authors.forename: Ella W
authors.initials: EW
authors.lastname: Yeung
authors.affiliation: Department of Rehabilitation Sciences, The Hong Kong Polytechnic University , Hung Hom, Hong Kong.
authors.forename: Cheuk C
authors.initials: CC
authors.lastname: Lau
authors.affiliation: Department of Rehabilitation Sciences, The Hong Kong Polytechnic University , Hung Hom, Hong Kong.
authors.forename: Ada P K
authors.initials: AP
authors.lastname: Kwong
authors.affiliation: Department of Rehabilitation Sciences, The Hong Kong Polytechnic University , Hung Hom, Hong Kong.
authors.forename: Yan M
authors.initials: YM
authors.lastname: Sze
authors.affiliation: Department of Rehabilitation Sciences, The Hong Kong Polytechnic University , Hung Hom, Hong Kong.
authors.forename: Wei Y
authors.initials: WY
authors.lastname: Zhang
authors.affiliation: Center of Sports Training and Rehabilitation, Department of Rehabilitation Sciences.
authors.forename: Simon S
authors.initials: SS
authors.lastname: Yeung
keywords: Acute whole body vibration; neuromuscular performance; peak torque; stretch reflex