Chronic neural adaptation induced by long-term resistance training in humans
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Chronic neural adaptation induced by long-term resistance training in humansAuthor(s)
Date
2006-02-28Citation
Fernández Del Olmo M, Reimunde P, Viana O, Martín Acero R, Cudeiro J. Chronic neural adaptation induced by long-term resistance training in humans. Eur J Appl Physiol. 2006;96:722-728
Abstract
[Abstract] While it is known that resistance training causes changes in the central nervous system (CNS) in the initial stages of training, there have been few studies of cumulative or sustained neural adaptation to resistance training beyond the initial periods. To further investigate this we compared the electromyographic (EMG) response to transcranial magnetic stimulation (TMS) during voluntary contractions of ten subjects who have been training for more than 2 years, resistance-training (RT) group, and ten subjects that have never participated in resistance training (NT). The active motor threshold for biceps brachii was obtained during voluntary elbow flexion at 10% of maximal voluntary contraction (MVC). TMS was also delivered at 100% of the maximal stimulator output while the participants exerted forces ranging from 10 to 90% of MVC. Evoked force, motor-evoked potential (MEP) amplitude and latency from biceps brachii was recorded for each condition to explore changes in corticospinal excitability. The evoked force was significantly lower in the RT group in comparison with the NT group between 30 and 70% of MVC intensity (P<0.05). At 90% of MVC, nine subjects from the RT group showed an absence in the evoked force while this occurred in only five subjects from the NT group. The MEP amplitude and latency changed significantly (P<0.001) with increasing levels of contraction, without significant difference between groups. These results indicate that changes in the CNS are sustained in the log-term practices of resistance training and permit a higher voluntary activation at several intensities of the MVC.
Keywords
Transcranial magnetic stimulation
Resistance training
Neural adaptation
Voluntary contractation
Submaximal contraction
Resistance training
Neural adaptation
Voluntary contractation
Submaximal contraction
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