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Intramuscular and surface electromyogram changes during muscle fatigue
Abstract
Twelve male subjects were tested to determine the effects of motor unit (MU) recruitment and firing frequency on the surface electromyogram (EMG) frequency power spectra during sustained maximal voluntary contraction (MVC) and 50% MVC of the biceps brachii muscle. Both the intramuscular MU spikes and surface EMG were recorded simultaneously and analyzed by means of a computer-aided intramuscular spike amplitude-frequency histogram and frequency power spectral analysis, respectively. Results indicated that both mean power frequency (MPF) and amplitude (rmsEMG) of the surface EMG fell significantly (P less than 0.001) together with a progressive reduction in MU spike amplitude and firing frequency during sustained MVC. During 50% MVC there was a significant decline in MPF (P less than 0.001), but this decline was accompanied by a significant increase in rmsEMG (P less than 0.001) and a progressive MU recruitment as evidenced by an increased number of MUs with relatively large spike amplitude. Our data suggest that the surface EMG amplitude could better represent the underlying MU activity during muscle fatigue and the frequency powers spectral shift may or may not reflect changes in MU recruitment and rate-coding patterns.
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Citations
Cited by
Interpretation of EMG changes with fatigue: facts, pitfalls, and fallacies
Dimitrova, N. A., & Dimitrov, G. V. (2003) · Journal of Electromyography and Kinesiology · doi:10.1016/s1050-6411(02)00083-4 · Cited by 458
Motor unit activity and surface electromyogram power spectrum during increasing force of contraction
Moritani, T., & Muro, M. (1987) · European Journal of Applied Physiology and Occupational Physiology · doi:10.1007/bf00690890 · Cited by 301
Self-citationSmith, A. E., Moon, J. R., Kendall, K. L., Graef, J. L., Lockwood, C. M., Walter, A. A., Beck, T. W., Cramer, J. T., & Stout, J. R. (2009) · European Journal of Applied Physiology · doi:10.1007/s00421-008-0911-7 · Cited by 62
1998 ISEK Congress Keynote Lecture
Moritani, T., & Yoshitake, Y. (1998) · Journal of Electromyography and Kinesiology · doi:10.1016/s1050-6411(98)00018-2 · Cited by 50
Self-citationSmith, A. E., Walter, A. A., Herda, T. J., Ryan, E. D., Moon, J. R., Cramer, J. T., & Stout, J. R. (2007) · Journal of the International Society of Sports Nutrition · doi:10.1186/1550-2783-4-20 · Cited by 30
Metadata
- Authors
- Moritani, T., Muro, M., & Nagata, A.
- Venue
- Journal of Applied Physiology
- Publisher
- American Physiological Society
- Published
- 1986-04-01
- Volume
- 60
- Issue
- 4
- Pages
- 1179-1185
- ISSN
- 0161-7567 (ISSN-L)
- 8750-7587
- 1522-1601
- OpenAlex
- W2164476255
- Cited by
- 420
- References
- 0
- FWCI
- 4.01
- Type
- journal article
- Language
- en
- Open access
- closed
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- Moritani, T., Muro, M., & Nagata, A. (1986). Intramuscular and surface electromyogram changes during muscle fatigue. Journal of Applied Physiology. https://doi.org/10.1152/jappl.1986.60.4.1179
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
