Variation in neuromuscular responses during acute whole-body vibration exercise.
Med Sci Sports Exerc
; 39(9): 1642-50, 2007 Sep.
Article
em En
| MEDLINE
| ID: mdl-17805098
ABSTRACT
PURPOSE:
Leg muscle strength and power are increased after whole-body vibration (WBV) exercise. These effects may result from increased neuromuscular activation during WBV; however, previous studies of neuromuscular responses during WBV have not accounted for motion artifact.METHODS:
Sixteen healthy adults performed a series of static and dynamic unloaded squats with and without two different directions of WBV (rotational vibration, RV; and vertical vibration, VV; 30 Hz; 4 mmp-p). Activation of unilateral vastus lateralis, biceps femoris, gastrocnemius, and tibialis anterior was recorded using EMG. During RV and VV, increases in EMG relative to baseline were compared over a range of knee angles, contraction types (concentric, eccentric, isometric), and squatting types (static, dynamic).RESULTS:
After removing large, vibration-induced artifacts from EMG data using digital band-stop filters, neuromuscular activation of all four muscles increased significantly (PCONCLUSIONS:
Motion artifacts should be removed from EMG data collected during WBV. We propose that neuromuscular responses during WBV may be modulated by leg muscle cocontraction as a postural control strategy and/or muscle tuning by the CNS intended to minimize soft-tissue vibration.
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Base de dados:
MEDLINE
Assunto principal:
Vibração
/
Perna (Membro)
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article