The effect of local skin cooling before a sustained, submaximal isometric contraction on fatigue and isometric quadriceps femoris performance: A randomized controlled trial.

摘要: Abstract The central- and peripheral mechanisms by which heat strain limits physical performance are not fully elucidated. Nevertheless, pre-cooling is often used in an attempt to improve subsequent performance. This study compared the effects of vs. a pre-thermoneutral application on fatigue during 60% isometric maximum voluntary contraction (MVC) right quadriceps femoris muscle. Furthermore, between MVC muscle subjective ratings perceived exertion (RPE) were investigated. In this randomized controlled trial, 18 healthy adults voluntarily participated. participants received either cold (experimental) (+8 °C) or thermoneutral (control) (+32 °C) for 20 min their thigh (one cuff). After application, central (fractal dimension – FD) (muscle fiber conduction velocity CV) was estimated using sEMG parameters MVC. Surface EMG signals detected from vastus medialis lateralis bidimensional arrays. Immediately after submaximal contraction, RPE assessed. Participants receiving able maintain significantly longer when group (mean time: 78 46 s; p=0.04). had no significant impact (p>0.05) (p=0.03). However, signs higher (p=0.008). Pre-cooling effect exertion. attenuated led times application. These findings support use procedures prior exercises applications.