title: Influence of the knee flexion on muscle activation and transmissibility during whole body vibration.
abstract: The influence of the knee flexion on muscle activation and transmissibility during whole body vibration is controversially discussed in the literature. In this study, 34 individuals had electromyography activity (EMG) of the vastus lateralis and the acceleration assessed while squatting with 60° and 90° of knee flexion either with or without whole-body vibration (WBV). The conditions were maintained for 10s with 1min of rest between each condition. The main findings were (1) the larger the angle of knee flexion (90° vs. 60°), the greater the EMG (p<0.001), with no difference on acceleration transmissibility; (2) for both angles of knee flexion, the addition of WBV produced no significant difference in EMG and higher acceleration compared to without WBV (p<0.001). These results suggest that the larger the knee flexion angle (60° vs. 90°), the greater the muscle activation without acceleration modification. However, the addition of WBV increases the transmissibility of acceleration in the lower limbs without modification in EMG of vastus lateralis.
authors: Federal University of the Jequitinhonha and Mucuri Valleys, Exercise Physiology Laboratory, Brazil.
authors: Núbia C P
authors: NC
authors: Avelar
authors: Vanessa G C
authors: VG
authors: Ribeiro
authors: Bruno
authors: B
authors: Mezêncio
authors: Sueli F
authors: SF
authors: Fonseca
authors: Rosalina
authors: R
authors: Tossige-Gomes
authors: Sidney J
authors: SJ
authors: da Costa
authors: Leszek
authors: L
authors: Szmuchrowski
authors: Fernando
authors: F
authors: Gripp
authors: Cândido C
authors: CC
authors: Coimbra
authors: Ana Cristina R
authors: AC
authors: Lacerda
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology; D000328:Adult; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D010812:Physical Stimulation / Q000379:methods*; D004856:Postural Balance / Q000502:physiology*; D016059:Range of Motion, Articular / Q000502:physiology; D014732:Vibration