Table_1_Whole-Body Vibration Exercise in Different Postures on Handgrip Strength in Healthy Women: A Cross-Over Study.pdf

ObjectiveTo compare the effect of Whole-Body Vibration Exercise (WBVE) applied in push-up modified and half-squat positions, on handgrip strength (HS) and on the electromyography registry (EMGrms) of the flexor digitorum superficialis muscle (FDSM) of the dominant hand. MethodsNineteen healthy women (age 23.40 ± 4.03 years, bodyweight: 58.89 ± 9.87 kg), performed in a randomized order five different tests: (S1) Control; (S2) Push-up modified; (S3) Push-up placebo; (S4); Half-squatting; (S5) Half-squatting placebo. The HS and the EMGrms were assessed at baseline and immediately after the tests. ANOVA two-way design mixed test, with Tukey post hoc, was used to evaluate the HS, EMGrms and the ratio between EMGrms and HS, i.e., neural ratio (NR). Thus, the lower NR represents the greater neuromuscular modifications. The statistical significance level was set up at p < 0.05. ResultsWBVE on S2 increased HS compared to the stimulus applied to the S4 (p = 0.0001). The increase in HS was associated with a reduction in the EMGrms of the FDSM (p < 0.001) and a lower NR (p < 0.0001), i.e., greater neuromuscular modifications, in the S2 compared to the S4 after the tests. ConclusionThe distance of the stimulus and the positioning on the vibratory platform influence the maximum muscular strength due to neuromuscular modifications of hands in healthy women.研究目的：对比改良俯卧撑与半蹲姿势下实施的全身振动训练（Whole-Body Vibration Exercise, WBVE）对利手握力（handgrip strength, HS）以及指浅屈肌（flexor digitorum superficialis muscle, FDSM）的肌电图均方根值（electromyography registry, EMGrms）的影响。 研究方法：招募19名健康女性受试者，年龄为23.40±4.03岁，体质量为58.89±9.87 kg。所有受试者以随机顺序完成5项不同测试：(S1) 对照组；(S2) 改良俯卧撑组；(S3) 俯卧撑安慰剂组；(S4) 半蹲组；(S5) 半蹲安慰剂组。分别于测试前基线状态及测试结束后即刻评估握力（HS）与肌电图均方根值（EMGrms）。采用双向混合方差分析结合Tukey事后检验对握力（HS）、肌电图均方根值（EMGrms）以及EMGrms与HS的比值（即神经比值（neural ratio, NR））进行分析。神经比值（NR）越低，提示神经肌肉适应性改变程度越高。本研究设定统计学显著性阈值为p<0.05。 研究结果：与S4组干预相比，S2组实施的全身振动训练可提升握力（HS）（p=0.0001）。测试结束后，与S4组相比，S2组在握力提升的同时，指浅屈肌（FDSM）的肌电图均方根值（EMGrms）显著降低（p<0.001），且神经比值（NR）更低（p<0.0001），即神经肌肉适应性改变程度更高。 结论：振动刺激的作用距离与受试者在振动平台上的站位姿势，可通过改变健康女性手部的神经肌肉适应性，进而影响最大肌肉力量。