Greco Francesca, Emerenziani Gian Pietro, Folino Katia, Spadafora Marco, Cosco Loretta Francesca, Muscoli Carolina, Sgrò Paolo, Quinzi Federico
Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", 00135, Rome, Italy.
Department of Clinical and Experimental Medicine, University of Catanzaro "Magna Græcia", 88100, Catanzaro, Italy.
Heliyon. 2024 Aug 10;10(16):e35822. doi: 10.1016/j.heliyon.2024.e35822. eCollection 2024 Aug 30.
Whole-body vibration (WBV) has been employed for performance-enhancing purposes. WBV may positively affect muscular endurance and its underlying neural mechanisms due to an enhanced muscular blood circulation and oxygen uptake. However, the effects of WBV on endurance-related torque signal complexity have been understudied. This study aims to investigate the acute effects of WBV on i) maximal isometric torque production; ii) isometric knee extensors fatigability and iii) torque signal complexity during an isometric endurance task. Thirty adult males performed an isometric intermittent endurance protocol on their dominant lower limb after performing: static half squat with WBV (WBV), static half squat without WBV (HS), and no exercise protocol (CC). For each repetition the maximal torque was identified. The maximal torque of the first repetition was identified as the PeakT. The Mean torque (MTorque) and fatigue index (pFatigue) were calculated as the mean and the percentage decay in torque across the entire set of eighteen repetitions (MTorque, pFatigue), and across shorter blocks of six repetitions (MTorque, pFatigue; MTorque, pFatigue, and MTorque, pFatigue). Torque fluctuations were analysed computing Sample Entropy (SampEn) and the coefficient of variation (CV). PeakT was significantly higher in CC than in WBV (p < 0.01) and in HS (p < 0.01). PeakT was significantly higher in HS than in WB (p < 0.05). MTorque, MTorque, MTorque and MTorque were significantly higher in CC than in WBV (all p-values <0.01) and in HS (p < 0.01). MTorque was significantly higher in HS than in WB (p = 0.049). pFatigue was significantly higher in WBV than in CC (p < 0.05) whereas pFatigue was significantly higher in CC than in WB (p < 0.01) and in HS (p < 0.01). No effect of condition was observed for SampEn and CV. Acute WBV does not lead to beneficial effects on maximal torque production and isometric knee extensors fatigability. These acute detrimental effects may be related to long-term WBV-related adaptations.
全身振动（WBV）已被用于提高运动表现。由于增强了肌肉血液循环和氧气摄取，WBV可能对肌肉耐力及其潜在的神经机制产生积极影响。然而，WBV对耐力相关扭矩信号复杂性的影响尚未得到充分研究。本研究旨在调查WBV对以下方面的急性影响：i）最大等长扭矩产生；ii）等长伸膝肌疲劳性；iii）等长耐力任务期间的扭矩信号复杂性。30名成年男性在进行以下操作后，对其优势下肢进行等长间歇耐力训练：有WBV的静态半蹲（WBV）、无WBV的静态半蹲（HS）和无运动方案（CC）。对于每次重复，确定最大扭矩。第一次重复的最大扭矩被确定为峰值扭矩（PeakT）。计算平均扭矩（MTorque）和疲劳指数（pFatigue），分别为整个18次重复过程中扭矩的平均值和扭矩衰减百分比（MTorque，pFatigue），以及较短的6次重复块中的平均值和扭矩衰减百分比（MTorque，pFatigue；MTorque，pFatigue和MTorque，pFatigue）。通过计算样本熵（SampEn）和变异系数（CV）来分析扭矩波动。CC组的PeakT显著高于WBV组（p < 0.01）和HS组（p < 0.01）。HS组的PeakT显著高于WB组（p < 0.05）。CC组的MTorque、MTorque、MTorque和MTorque显著高于WBV组（所有p值<0.01）和HS组（p < 0.01）。HS组的MTorque显著高于WB组（p = 0.049）。WBV组的pFatigue显著高于CC组（p < 0.05），而CC组的pFatigue显著高于WB组（p < 0.01）和HS组（p < 0.01）。未观察到SampEn和CV的条件效应。急性WBV对最大扭矩产生和等长伸膝肌疲劳性没有有益影响。这些急性有害影响可能与长期WBV相关的适应性有关。
