Application of acute whole-body vibration and lower-body exercise: effects on concentric torque in lower-limb muscles

摘要

Summary Study aim : With contrary evidence regarding the effectiveness of acute whole-body vibration training (WBVT) on sporting performance, the current study examined WBVT’s effect on concentric torque of the quadriceps (Q) and hamstrings (H). Material and methods : Following ethical approval, 11 male team sport players (age: 22.9 ± 3.3 yrs, height: 1.80 ± 0.07 m, mass: 82.5 ± 12.6 kg) completed three separate weekly WBVT sessions. Baseline and post – WBVT intervention measurements of Q and H concentric torque were recorded, using an isokinetic dynamometer, at each session. Isokinetic knee extension and flexion was performed at 180os?1 through 90o range of motion. For the training intervention, vibration amplitude remained at 2 mm, while frequency was set at 0Hz, 30Hz or 50 Hz; randomised so participants experienced one frequency per session. Torque data (Nm) and H and Q ratio (H: Q) were analysed using 3-way and 2-way ANOVA with repeated measures respectively, with three within subjects’ factors: frequency, muscle group and intervention. Results : Main interaction effect (frequency x muscle group x intervention) was insignificant ( P = 0.327). Significant muscle group x frequency ( P = 0.029) and muscle group x intervention ( P = 0.001) interactions were found. Intervention, regardless of WBVT, significantly increased concentric torque of H ( P = 0.003) and significantly reduced concentric torque of Q ( P = 0.031). While H: Q x frequency interaction was insignificant ( P = 0.262), the intervention significantly improved H: Q ( P = 0.001). Conclusions : Team sport athletes experience a muscle-specific response in peak concentric torque to lower-body exercise. Acute WBVT does not provide additional positive or negative effects on Q or H strength.