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Hum Mov Sci. 2018 Aug;60:191-201. doi: 10.1016/j.humov.2018.06.011. Epub 2018 Jun 26.

Acute whole-body vibration increases reciprocal inhibition.

Author information

1
Department of Sports and Sports Science, University of Freiburg, Schwarzwaldstraße 175, 79117 Freiburg, Germany.
2
Department of Sports and Sports Science, University of Freiburg, Schwarzwaldstraße 175, 79117 Freiburg, Germany. Electronic address: a.krause@dshs-koeln.de.

Abstract

Based on previous evidence that whole-body vibration (WBV) affects pathways involved in disynaptic reciprocal inhibition (DRI), the present hypothesis-driven experiment aimed to assess the acute effects of WBV on DRI and co-contraction. DRI from ankle dorsiflexors to plantar flexors was investigated during submaximal dorsiflexion before and after 1 min of WBV. With electromyography, musculus soleus (SOL) H-reflex depression following a conditioning stimulation of the peroneal nerve (1.1x motor threshold for the musculus tibialis anterior, TA) was assessed and co-contraction was calculated. After WBV, DRI was significantly increased (+4%, p < 0.05). SOL (-13%, p < 0.05) and TA (-6%, p < 0.05) activities were significantly reduced; co-contraction tended to be diminished (-8%, p = 0.05). Dorsiflexion torque remained unchanged. After WBV, DRI increased during submaximal isometric contraction in healthy subjects. The simultaneous SOL relaxation and TA contraction indicate that a more economic movement execution is of functional significance for WBV application in clinical and athletic treatment.

KEYWORDS:

Antagonist; Co-contraction; Conditioned H-reflex; Electromyography; Peripheral nerve stimulation; Spinal excitability

PMID:
29957423
DOI:
10.1016/j.humov.2018.06.011
[Indexed for MEDLINE]

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