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Effects of real and sham whole‐body mechanical vibration on spinal excitability at rest and during muscle contraction
Author(s) -
Hortobágyi T.,
Rider P.,
DeVita P.
Publication year - 2014
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.12219
Subject(s) - rest (music) , contraction (grammar) , muscle contraction , medicine , whole body vibration , physical medicine and rehabilitation , anesthesia , anatomy , vibration , physics , quantum mechanics
We examined the effects of whole‐body mechanical vibration ( WBV ) on indices of motoneuronal excitability at rest and during muscle contraction in healthy humans. Real and sham WBV at 30 Hz had no effect on reflexes measured during muscle contraction. Real WBV at 30 and 50 Hz depressed the H ‐reflex ∼45%. These depressions diminished across the five inter‐bout rest intervals. The depression converted to 27% and 7% facilitation over the 15‐min long recovery period following real WBV at 30 and 50 Hz, respectively. The depression, measured during the inter‐bout rest, correlated r = 0.48 ( P = 0.007) with the subsequent facilitation, measured during the follow‐up. The depression produced by sham vs real WBV was significant but less (23%), recovered faster, and the facilitation was absent in the 15‐min long follow‐up period. WBV produced time‐varying depression followed by facilitation of the H ‐reflex at rest. A lack of change in volitional wave suggests that WBV did not affect the efferent neural drive.