Department of Exercise and Sport Science, High Point University, USA; Program in Human Movement Science, High Point University, USA.
Program in Human Movement Science, High Point University, USA.
J Electromyogr Kinesiol. 2021 Feb;56:102508. doi: 10.1016/j.jelekin.2020.102508. Epub 2020 Nov 28.
Quadriceps dysfunction is a common, chronic complication following anterior cruciate ligament reconstruction (ACLR) that contributes to aberrant gait biomechanics and poor joint health. Vibration enhances quadriceps function in individuals with ACLR, but the duration of these effects is unknown. This study evaluated the time course of the effects of whole body vibration (WBV) and local muscle vibration (LMV) on quadriceps function. Twenty-four volunteers with ACLR completed 3 testing sessions during which quadriceps isometric peak torque, rate of torque development, and EMG amplitude were assessed prior to and immediately, 10, 20, 30, 45, and 60 min following a WBV, LMV, or control intervention. WBV and LMV (30 Hz, 2g) were applied during six one-minute bouts. WBV increased peak torque 5-11% relative to baseline and control at all post-intervention time points. LMV increased peak torque 6% relative to baseline at 10 min post-intervention and 4-6% relative to control immediately, 10 min, and 20 min post-intervention. The interventions did not influence EMG amplitudes or rate of torque development. The sustained improvements in quadriceps following vibration, especially WBV, suggest that it could be applied at the beginning of rehabilitation sessions to "prime" the central nervous system, potentially improving the efficacy of ACLR rehabilitative exercise.
股四头肌功能障碍是前交叉韧带重建（ACL）后常见的慢性并发症，导致异常步态生物力学和关节健康状况不佳。振动可增强 ACLR 患者的股四头肌功能，但这些效果的持续时间尚不清楚。本研究评估了全身振动（WBV）和局部肌肉振动（LMV）对股四头肌功能的影响的时程。24 名 ACLR 志愿者在 3 次测试期间完成了测试，在 WBV、LMV 或对照干预后立即、10、20、30、45 和 60 分钟，评估了等长峰值扭矩、扭矩发展率和肌电图振幅。WBV 和 LMV（30 Hz，2g）应用于 6 个 1 分钟的回合。WBV 与基线和对照相比，在所有干预后时间点均使峰值扭矩增加了 5-11%。LMV 在干预后 10 分钟时与基线相比使峰值扭矩增加了 6%，与对照相比，在立即、10 分钟和 20 分钟时增加了 4-6%。这些干预措施没有影响肌电图振幅或扭矩发展率。振动后股四头肌的持续改善，尤其是 WBV，表明它可以在康复治疗开始时应用，以“启动”中枢神经系统，可能会提高 ACLR 康复运动的效果。
