Jacobs Patrick L, Burns Patricia
Exercise Science and Health Promotion Department, Florida Atlantic University, Davie, Florida, USA.
J Strength Cond Res. 2009 Jan;23(1):51-7. doi: 10.1519/JSC.0b013e3181839f19.
The purpose of this investigation was to examine the acute effects of whole-body vibration (WBV) on muscular strength, flexibility, and heart rate (HR). Twenty adults (10 men, 10 women) untrained to WBV participated in the study. All subjects completed assessment of lower-extremity isokinetic torque, flexibility, and HR immediately before and after 6 minutes of WBV and 6 minutes of leg cycling ergometry (CYL), in randomized order. During WBV, subjects stood upright on a vibration platform for a total of 6 minutes. Vibration frequency was gradually increased during the first minute to a frequency of 26 Hz, which was maintained for the remaining 5 minutes. During CYL, power output was gradually increased to 50 W during the first minute and maintained at that power output for the remaining 5 minutes. Lower-extremity flexibility was determined using the sit-and-reach box test. Peak and average isokinetic torque of knee extension and flexion were measured by means of a motor-driven dynamometer with velocity fixed at 120 degrees .s. Change scores for the outcome measures were compared between treatments using Student's paired t-tests. Analysis revealed significantly greater HR acceleration with CYL (24.7 bpm) than after WBV (15.8 bpm). The increase of sit-and-reach scores after WBV (4.7 cm) was statistically greater (p < 0.05) than after CYL (0.8 cm). After WBV, increases in peak and average isokinetic torque of knee extension, 7.7% and 9.6%, were statistically greater than after CYL (p < 0.05). Average torque of knee flexion also increased more with WBV (+7.8%) than with CYL (-1.5%) (p < 0.05). The findings of this study indicate that short-term WBV standing elicits acute enhancements of lower-extremity muscular torque and flexibility, suggesting the application of this technology as a preparatory activity before more intense exercise.
本研究的目的是探讨全身振动（WBV）对肌肉力量、柔韧性和心率（HR）的急性影响。20名未接受过WBV训练的成年人（10名男性，10名女性）参与了该研究。所有受试者以随机顺序在WBV 6分钟和腿部骑行测力计（CYL）6分钟前后立即完成下肢等速扭矩、柔韧性和HR的评估。在WBV期间，受试者直立在振动平台上共6分钟。在第一分钟内振动频率逐渐增加至26 Hz，并在剩余5分钟内保持该频率。在CYL期间，功率输出在第一分钟内逐渐增加至50 W，并在剩余5分钟内保持该功率输出。使用坐立前屈箱测试来测定下肢柔韧性。通过将速度固定在120度/秒的电动测力计测量膝关节伸展和屈曲的峰值和平均等速扭矩。使用学生配对t检验比较各治疗组间结局指标的变化分数。分析显示，CYL后的HR加速（24.7次/分钟）显著大于WBV后（15.8次/分钟）。WBV后坐立前屈分数的增加（4.7厘米）在统计学上大于CYL后（0.8厘米）（p<0.05）。WBV后，膝关节伸展的峰值和平均等速扭矩增加，分别为7.7%和9.6%，在统计学上大于CYL后（p<0.05）。膝关节屈曲的平均扭矩也随着WBV（+7.8%）比CYL（-1.5%）增加更多（p<0.05）。本研究结果表明，短期WBV站立可引起下肢肌肉扭矩和柔韧性的急性增强，提示该技术可作为更剧烈运动前的准备活动应用。
