Effects of supramaximal exercise on the electromyographic signal

• Published in: British journal of sports medicine Vol. 37; no. 4; pp. 296 - 299
• Main Authors: Hunter, A M, St Clair Gibson, A, Lambert, M I, Nobbs, L, Noakes, T D
• Format: Journal Article
• Language: English
• Published: England BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine 01.08.2003; BMJ Publishing Group Ltd; BMJ Publishing Group LTD; BMJ Publishing Group; BMJ Group
• Subjects: Adult; Athletes; Bicycling - physiology; Electrodes; electromyographic; electromyographic amplitude; Electromyography; EMG; Exercise; Exercise - physiology; Exercise Test - methods; Fatigue; Humans; IEMG; integrated EMG; Male; maximal isometric voluntary contraction; mean power frequency spectrum; Medical procedures; Metabolism; MPFS; Muscle Contraction - physiology; Muscle Fatigue - physiology; Muscles; MVC; Original; Recruitment, Neurophysiological; WAT; Wingate anaerobic test; United States > US
• ISSN: 0306-3674; 1473-0480
• DOI: 10.1136/bjsm.37.4.296

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<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.