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Br J Sports Med. 2003 Aug; 37(4): 296–299.
PMCID: PMC1724671

Effects of supramaximal exercise on the electromyographic signal


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.

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Selected References

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  • Bar-Or O. The Wingate anaerobic test. An update on methodology, reliability and validity. Sports Med. 1987 Nov-Dec;4(6):381–394. [PubMed]
  • Margaria R, Oliva RD, Di Prampero PE, Cerretelli P. Energy utilization in intermittent exercise of supramaximal intensity. J Appl Physiol. 1969 Jun;26(6):752–756. [PubMed]
  • Bernardi M, Solomonow M, Baratta RV. Motor unit recruitment strategy of antagonist muscle pair during linearly increasing contraction. Electromyogr Clin Neurophysiol. 1997 Jan-Feb;37(1):3–12. [PubMed]
  • Hussain ST, Smith RE, Medbak S, Wood RF, Whipp BJ. Haemodynamic and metabolic responses of the lower limb after high intensity exercise in humans. Exp Physiol. 1996 Mar;81(2):173–187. [PubMed]
  • Mortimer JT, Magnusson R, Petersén I. Conduction velocity in ischemic muscle: effect on EMG frequency spectrum. Am J Physiol. 1970 Nov;219(5):1324–1329. [PubMed]
  • Arendt-Nielsen L, Mills KR, Forster A. Changes in muscle fiber conduction velocity, mean power frequency, and mean EMG voltage during prolonged submaximal contractions. Muscle Nerve. 1989 Jun;12(6):493–497. [PubMed]
  • McCartney N, Heigenhauser GJ, Jones NL. Power output and fatigue of human muscle in maximal cycling exercise. J Appl Physiol Respir Environ Exerc Physiol. 1983 Jul;55(1 Pt 1):218–224. [PubMed]
  • Vandewalle H, Maton B, Le Bozec S, Guerenbourg G. An electromyographic study of an all-out exercise on a cycle ergometer. Arch Int Physiol Biochim Biophys. 1991 Feb;99(1):89–93. [PubMed]
  • Nagamachi A, Ikata T, Katoh S, Morita T. Spectral analysis of erector spinae muscle surface electromyography as an index of exercise performance in maximal treadmill running. J Med Invest. 2000 Feb;47(1-2):29–35. [PubMed]
  • Green S. Measurement of anaerobic work capacities in humans. Sports Med. 1995 Jan;19(1):32–42. [PubMed]
  • Dotan R, Bar-Or O. Load optimization for the Wingate Anaerobic Test. Eur J Appl Physiol Occup Physiol. 1983;51(3):409–417. [PubMed]
  • Merletti R, Lo Conte LR. Advances in processing of surface myoelectric signals: Part 1. Med Biol Eng Comput. 1995 May;33(3 Spec No):362–372. [PubMed]
  • Zwarts MJ, Van Weerden TW, Haenen HT. Relationship between average muscle fibre conduction velocity and EMG power spectra during isometric contraction, recovery and applied ischemia. Eur J Appl Physiol Occup Physiol. 1987;56(2):212–216. [PubMed]
  • Hagberg M. Muscular endurance and surface electromyogram in isometric and dynamic exercise. J Appl Physiol Respir Environ Exerc Physiol. 1981 Jul;51(1):1–7. [PubMed]
  • Lago P, Jones NB. Effect of motor-unit firing time statistics on e.m.g. spectra. Med Biol Eng Comput. 1977 Nov;15(6):648–655. [PubMed]
  • van Boxtel A, Schomaker LR. Influence of motor unit firing statistics on the median frequency of the EMG power spectrum. Eur J Appl Physiol Occup Physiol. 1984;52(2):207–213. [PubMed]
  • Moritani T, Muro M, Nagata A. Intramuscular and surface electromyogram changes during muscle fatigue. J Appl Physiol (1985) 1986 Apr;60(4):1179–1185. [PubMed]
  • Lindstrom L, Magnusson R, Petersén I. Muscular fatigue and action potential conduction velocity changes studied with frequency analysis of EMG signals. Electromyography. 1970 Nov-Dec;10(4):341–356. [PubMed]
  • Viitasalo JH, Komi PV. Signal characteristics of EMG during fatigue. Eur J Appl Physiol Occup Physiol. 1977 Sep 16;37(2):111–121. [PubMed]
  • Blank A, Gonen B, Magora A. The size of active motor units in the initiation and maintenance of an isometric contraction carried out to fatigue. Electromyogr Clin Neurophysiol. 1979 Nov-Dec;19(6):535–539. [PubMed]
  • Degtyarenko AM, Kaufman MP. Stimulation of the mesencephalic locomotor region inhibits the discharge of neurons in the superficial laminae of the dorsal horn of cats. Neurosci Lett. 2000 Dec 22;296(2-3):109–112. [PubMed]
  • Juel C. Muscle action potential propagation velocity changes during activity. Muscle Nerve. 1988 Jul;11(7):714–719. [PubMed]
  • Bigland-Ritchie B, Johansson R, Lippold OC, Woods JJ. Contractile speed and EMG changes during fatigue of sustained maximal voluntary contractions. J Neurophysiol. 1983 Jul;50(1):313–324. [PubMed]
  • Bigland-Ritchie B. Factors contributing to quantitative surface electromyographic recording and how they are affected by fatigue. Am Rev Respir Dis. 1979 Feb;119(2 Pt 2):95–97. [PubMed]
  • Moritani T, Muro M, Kijima A, Gaffney FA, Parsons D. Electromechanical changes during electrically induced and maximal voluntary contractions: surface and intramuscular EMG responses during sustained maximal voluntary contraction. Exp Neurol. 1985 Jun;88(3):484–499. [PubMed]
  • Petrofsky JS, Lind AR. The influence of temperature on the amplitude and frequency components of the EMG during brief and sustained isometric contractions. Eur J Appl Physiol Occup Physiol. 1980;44(2):189–200. [PubMed]
  • Bigland-Ritchie B, Kukulka CG, Lippold OC, Woods JJ. The absence of neuromuscular transmission failure in sustained maximal voluntary contractions. J Physiol. 1982 Sep;330:265–278. [PMC free article] [PubMed]
  • Moritani T, Nagata A, deVries HA, Muro M. Critical power as a measure of physical work capacity and anaerobic threshold. Ergonomics. 1981 May;24(5):339–350. [PubMed]
  • St Clair Gibson A, Schabort EJ, Noakes TD. Reduced neuromuscular activity and force generation during prolonged cycling. Am J Physiol Regul Integr Comp Physiol. 2001 Jul;281(1):R187–R196. [PubMed]

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