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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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REPETITIVE PERIPHERAL MAGNETIC STIMULATION (15 HZ RPMS) OF THE HUMAN SOLEUS MUSCLE DID NOT AFFECT SPINAL EXCITABILITY |
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Martin Behrens1  ,
Anett Mau-Möller1, Volker Zschorlich2 and Sven Bruhn1 |
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1Department of Exercise Science and 2Department of Movement Science, University of Rostock, Rostock, Germany |
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© Journal of Sports Science and Medicine (2011) 10, 39 - 44 |
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| ABSTRACT | |||
| The electric field induced by repetitive peripheral magnetic stimulation
(RPMS) is able to activate muscles artificially due to the stimulation of
deep intramuscular motor axons. RPMS applied to the muscle induces proprioceptive
input to the central nervous system in different ways. Firstly, the indirect
activation of mechanoreceptors and secondly, direct activation of afferent
nerve fibers. The purpose of the study was to examine the effects of RPMS
applied to the soleus. Thirteen male subjects received RPMS once and were
investigated before and after the treatment regarding the parameters maximal
M wave (Mmax), maximal H-reflex (Hmax), Hmax/Mmax-ratio, Hmax and Mmax onset
latencies and plantar flexor peak twitch torque associated with Hmax (PTH).
Eleven male subjects served as controls. No significant changes were observed
for Hmax and PTH of the treatment group but the Hmax/Mmax-ratio increased
significantly (p = 0.015) on account of a significantly decreased Mmax (p
= 0.027). Hmax onset latencies were increased for the treatment group (p
= 0.003) as well as for the control group (p = 0.011) while Mmax onset latencies
did not change. It is concluded that the RPMS protocol did not affect spinal
excitability but acted on the muscle fibres which are part of fast twitch
units and mainly responsible for the generation of the maximal M wave. RPMS
probably modified the integrity of neuromuscular propagation.
Key words: Electromyography, repetitive peripheral magnetic stimulation, H-reflex, M wave, soleus, twitch torque. |
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