Effects of supramaximal exercise on the electromyographic signal



Hunter A, Gibson ASC, Lambert M, Nobbs LA & Noakes TD (2003) Effects of supramaximal exercise on the electromyographic signal. British Journal of Sports Medicine, 37 (4), pp. 296-299.

Aim: To determine the neuromuscular recruitment characteristics during supramaximal exercise. Methods: Ten healthy subjects completed the Wingate anaerobic test (WAT) cycling protocol. Electromyographic (EMG) data and rate of fatigue were recorded throughout the cycling. Results: The mean (SD) rate of fatigue (decrease in power output) was 44.5 (8.6)%. No significant change was found in EMG amplitude. A significant decrease (p less than 0.01) in mean power frequency spectrum was found over the 30 second period. Conclusions: During WAT, mean power frequency spectrum was attenuated with no decline in EMG amplitude, which may be caused by an accumulation of metabolites in the periphery. However, it is also possible that the feedback loop from intramuscular metabolism to the central nervous system is unable, within the 30 second period of the WAT, to affect neural recruitment strategy.

; Physical education and training; Muscle strength; Physical fitness; Physiological aspects; Physical Education and Training methods; Athletic Performance physiology

British Journal of Sports Medicine: Volume 37, Issue 4

Publication date31/08/2003
PublisherBMJ Publishing Group / British Association of Sport and Exercise Medicine / European College of Sports and Exercise Physicians

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Professor Angus Hunter

Professor Angus Hunter

Honorary Professor, FHSS Management and Support