Colson Serge S, Gioda Jennifer, Da Silva Flavio
Université Côte d'Azur, LAMHESS, France.
Sports (Basel). 2023 Apr 25;11(5):94. doi: 10.3390/sports11050094.
Whole-body vibration (WBV) training programs were reported to improve knee extensor muscle (KE) strength in healthy participants. Unfortunately, the underlying mechanisms of these strength gains remain unresolved. In addition, WBV training was shown to increase the time-to-exhaustion of a static submaximal endurance task. However, the effects of WBV training on neuromuscular fatigue (i.e., a decrease of the maximal voluntary isometric contraction; MVIC) induced by an endurance task is unknown. We, therefore, investigated the influence of WBV training on (i) KE MVIC and neuromuscular function, (ii) the time-to-exhaustion of the KE associated with a submaximal isometric fatiguing exercise, and (iii) KE neuromuscular fatigue and its etiology. Eighteen physically active males were assigned to a WBV group ( = 10) or a sham training group (SHAM; = 8). The MVIC of the KE, voluntary activation, and electrically evoked responses of the KE were assessed (i) before and after a fatiguing exercise (i.e., submaximal isometric contraction) performed until failure, and (ii) before (PRE) and after a 6-week training (POST) period. At POST, the WBV training increased the KE MVIC (+12%, = 0.001) and voluntary activation (+6%, < 0.05) regardless of the fatiguing exercise. The time-to-exhaustion was also lengthened at POST in the WBV group (+34%, < 0.001). Finally, the relative percentage of MVIC decrease after fatiguing exercises diminished in the WBV group between PRE and POST (-14% vs. -6%, respectively, < 0.001). Significant neural adaptation enhancements account for the trend in KE strength improvements observed after the WBV training program. In addition, the WBV training was effective at increasing the time-to-exhaustion and attenuating neuromuscular fatigue.
据报道，全身振动（WBV）训练计划可提高健康参与者的膝伸肌（KE）力量。遗憾的是，这些力量增加的潜在机制仍未得到解决。此外，WBV训练被证明可以增加静态次最大耐力任务的疲劳时间。然而，WBV训练对耐力任务引起的神经肌肉疲劳（即最大自主等长收缩；MVIC降低）的影响尚不清楚。因此，我们研究了WBV训练对（i）KE的MVIC和神经肌肉功能、（ii）与次最大等长疲劳运动相关的KE疲劳时间以及（iii）KE神经肌肉疲劳及其病因的影响。18名身体活跃的男性被分配到WBV组（n = 10）或假训练组（SHAM；n = 8）。在（i）进行至疲劳的疲劳运动（即次最大等长收缩）之前和之后，以及（ii）在为期6周的训练（POST）期之前（PRE）和之后，评估KE的MVIC、自愿激活和KE的电诱发反应。在POST时，无论疲劳运动如何，WBV训练均增加了KE的MVIC（+12%，P = 0.001）和自愿激活（+6%，P < 0.05）。WBV组在POST时的疲劳时间也延长了（+34%，P < 0.001）。最后，WBV组在PRE和POST之间疲劳运动后MVIC降低的相对百分比有所减少（分别为-14%和-6%，P < 0.001）。显著的神经适应性增强解释了WBV训练计划后观察到的KE力量改善趋势。此外，WBV训练在增加疲劳时间和减轻神经肌肉疲劳方面是有效的。
