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Int J Sports Med 2015; 36(11): 922-928
DOI: 10.1055/s-0035-1549959
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Neuromuscular Fatigue after Submaximal Intermittent Contractions in Motorcycle Riders

P. Torrado
1   INEFC Barcelona, Sport Performance, Barcelona, Spain
,
C. Cabib
2   Hospital Clínic, Neurophysiology, Barcelona, Spain
,
M. Morales
2   Hospital Clínic, Neurophysiology, Barcelona, Spain
,
J. Valls-Sole
3   Hospital Clinic, Neurology, Barcelona, Spain
,
M. Marina
1   INEFC Barcelona, Sport Performance, Barcelona, Spain
› Author Affiliations
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Publication History



accepted after revision 13 April 2015

Publication Date:
03 July 2015 (online)

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Abstract

Highly repetitive submaximal intermittent contractions of the forearm muscles during periods of 30–50 min partially explain why motorcycle races are so demanding for the neuromuscular system. This study investigated the contribution of central and peripheral mechanisms of fatigue on the exerted and contralateral extensor digitorum communis following an intermittent fatigue protocol (IFP) designed for motorcycle riders. 12 riders performed an IFP, which simulates the braking and throttle handle gesture. We examined the time course of recovery of maximal voluntary contraction (MVC), M-wave, motor evoked potential (MEP) to transcranial magnetic stimuli in relaxed and facilitated condition, and the cortical silent period (CSP) at time windows of 1, 3, 5, 10 and 20 min after the IFP. Whereas MVC, M-wave and MEP decreased, CSP lengthened significantly in the fatigued limb after completion of the IFP. Nevertheless, no differences were observed in the contralateral limb. All neurophysiological parameters reverted to baseline values in less than 20 min, while MVC remained lower in the exercised limb. No cross-over effects were observed in the contralateral non-exercised limb. Our results suggest that local factors are those mainly responsible for the incomplete MVC recovery after an intermittent muscle contraction protocol.

Key words

extensor digitorum - handgrip - evoked potentials - voluntary contraction
 

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