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Muscle velocity recovery cycles: Effects of repetitive stimulation on two muscles
Author(s) -
BoËRio Delphine,
Z'graggen Werner J.,
Tan S. Veronica,
Guetg Andri,
Ackermann Karin,
Bostock Hugh
Publication year - 2012
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.23267
Subject(s) - stimulation , brachioradialis , physical medicine and rehabilitation , muscle contraction , electromyography , neurophysiology , tibialis anterior muscle , medicine , compound muscle action potential , neuroscience , anatomy , electrophysiology , psychology , skeletal muscle
We sought to characterize the excitability properties of tibialis anterior (TA) and brachioradialis (BR) muscles at rest and during electrically induced muscle activation in normal subjects. Methods: Two centers recruited 10 subjects each. Multi‐fiber velocity recovery cycles (VRCs) were recorded from TA (both centers) and BR (one center). VRCs were assessed at rest and during repetitive stimulation (intermittent 20 Hz for 6 min). Changes in latency and peak amplitude of the muscle action potential induced by a frequency ramp to 30 Hz were also characterized. Results: Excitability properties recorded from TA were very similar between centers. Repetitive stimulation generated marked excitability changes, which were similar between TA and BR. Conclusions: Standardized tests of muscle VRCs and responses to repetitive stimulation can provide consistent measures of membrane function and may encourage their wider use in clinical neurophysiology to investigate the pathophysiology of neuromuscular disorders. Muscle Nerve 46: 102–111, 2012