Faculty of Physical Activity and Sport Science-INEF, LFE Research Group, Department of Health and Human Performance, Universidad Politécnica de Madrid, Madrid, Spain.
Department of Education, University of Almería, Almeria, Spain.
Scand J Med Sci Sports. 2021 Jun;31(6):1268-1275. doi: 10.1111/sms.13935. Epub 2021 Mar 6.
The purposes of this study were to determine the impact of 6 weeks of whole-body vibration training (WBVT) on maximum voluntary plantar flexor strength, muscle activity via surface electromyography (EMG), and muscle architecture measured at rest and during maximal contraction at different ankle joint angles in young healthy adults. Using a single-blind study design, 28 healthy men and women were randomly assigned to control (CG; N = 14, 7 women) or whole-body vibration training (WBVG; N = 14, 7 women) groups. Vibration training (20-25 minutes; standing with knees flexed) was performed 3 week for 6 weeks (18 sessions). Maximum isometric plantar flexor torque, muscle activity (medial and lateral gastrocnemius EMG) and medial gastrocnemius fascicle angle and length at rest and maximum contraction were tested at four ankle joint angles (ranging 45° to -15°; 0° = anatomical) before and after training. Significant increases (24.7%-37.5%) were observed in peak torque (N∙m∙kg ;%) at -15°, 0°, 15° and 30° joint angles from pre- to post-intervention in WBVG, which were different to CG (no change) and greater at longer muscle lengths. No between-group differences were observed in changes in EMG amplitudes measured during contraction or muscle architecture parameters at rest or during contraction. Six weeks of WBVT in young, healthy adults increased isometric plantarflexion strength at multiple joint angles, without detectible changes in EMG, muscle architecture, or body composition. Therefore, WBVT can significantly improve maximum plantar flexor strength at multiple joint angles (muscle lengths) in young healthy men, although the mechanisms underpinning the changes are currently unclear.
本研究旨在确定 6 周全身振动训练（WBVT）对年轻健康成年人最大自愿足底屈肌力量、表面肌电图（EMG）测量的肌肉活动以及在不同踝关节角度下最大收缩时的肌肉结构的影响。采用单盲研究设计，将 28 名健康男性和女性随机分为对照组（CG；N=14，女性 7 人）或全身振动训练组（WBVG；N=14，女性 7 人）。振动训练（20-25 分钟；膝关节弯曲站立）每周进行 3 次，共 6 周（18 次）。在训练前后，分别在四个踝关节角度（45°至-15°；0°=解剖）测试最大等长足底屈肌扭矩、肌肉活动（内侧和外侧比目鱼肌 EMG）以及最大收缩时的内侧比目鱼肌筋膜角度和长度。在 WBVG 中，从干预前到干预后，-15°、0°、15°和 30°关节角度的峰值扭矩（N·m·kg；%）增加了 24.7%-37.5%，与 CG（无变化）不同，且在较长的肌肉长度时增加更大。在收缩过程中测量的 EMG 幅度或在休息或收缩过程中的肌肉结构参数方面，两组之间没有观察到变化。在年轻健康成年人中，6 周的 WBVT 增加了多个关节角度的等长足底屈肌力量，而 EMG、肌肉结构或身体成分没有可检测到的变化。因此，WBVT 可以显著提高年轻健康男性多个关节角度（肌肉长度）的最大足底屈肌力量，尽管目前尚不清楚其变化的机制。
