Abstract
During incremental exercise on a cycle ergometer a study was made of the reproducibility of changes in electromyographic activity (EMG) of human quadriceps muscles. Seven subjects performed three periods of incremental exercise either every 2 weeks (G1: four subjects) or 6 weeks (G2: three subjects). Each test was normalized with respect to the maximal aerobic power (MAP) of the subject. It consistd of a quasilinear increase in mechanical power (from 20% to 100% MAP) during 8 min. For rectus femoris muscle activity, changes in total power spectrum (PEMG) and in mean power frequency (MPF) were fitted by a 3rd order polynomial function (named profile) and normalized with respect to the maximal value for PEMG and to the mean value for MPF. A curvilinear increase was found for PEMG. The MPF kinetics varied from one subject to another. These changes were either a continuous increase, or a continuous decrease or an increase followed by a decrease. Only for G2, was MAP determined before each test in order to update the limits of the test. A good reproducibility of PEMG was shown by its mean magnitude [95.88%, (SD 3.92)] and by computing a mean correlation coefficient between profiles two by two [r 2=0.948 (SD 0.028)n=21]. Intraclass coefficient correlation (ICC) calculated for each subject indicated a high level of reproducibility for five of the seven subjects (ICC>0.80). No clear effect of MAP updating on PEMG and MPF profile reproducibility was observed. Thus it is suggested that MPF kinetics may characterize a subject at a given moment while PEMG kinetics may illustrate a normal profile, and they may both characterize EMG changes for a population during incremental exercise.
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References
Arsenault AB, Winter DA, Marteniuk RG (1986) Is there a normal' profile of EMG activity in gait? Med Biol Eng Comput 24: 337–343
Astrand PO, Rodahl K (1986) Textbook of work physiology, 3rd edn. McGraw-Hill, New York
Daanen HAM, Mazure M, Holewijn M, Van der Velde EA (1990) Reproducibility of the mean power frequency of the surface electromyogram. Eur J Appl Physiol 61: 274–277
De Luca CJ (1984) Myoelectrical manifestations of localized muscular fatigue in humans. CRC Crit Rev Biomed Eng 11: 251–279
Duchêne J, Goubel F (1993) Surface electromyogram during voluntary contraction: processing tools and relation to physiological events. CRC Crit Rev Biomed Eng 21: 313–397
Duchêne J, Gamet D, Bar-Garapon C, Vanhoutte C (1988) Système de contrôle automatique d'un ergocycle. Sci Mot 4: 47–49
Gamet D, Duchêne J, Bar-Garapon C, Goubel F (1993) Surface electromyogram power spectrum in human quadriceps muscle during incremental exercise. J Appl Physiol 74: 2704–2710
Helal JN, Guezennec CY, Goubel F (1987) The aerobic-anaerobic transition: re-examination of the threshold concept including an electromyographic approach. Eur J Appl Physiol 56: 643–649
Knutson LM, Soderberg GL, Ballantyne BT, Clarke WR (1994) A study of various normalization procedures for within day electromyographic data. J Electromyogr Kinesiol 4: 47–59
Lindström L, Magnusson R, Petersén I (1970) Muscular fatigue and action potential conduction velocity changes studied with frequency analysis of EMG signals. Electromyogr Clin Neurophysiol 10: 341–356
Linssen WHJP, Stegeman DF, Joosten EMG, Van'tHof MA, Binkhorst RA, Notermans SLH (1993) Variability and interrelationships of surface EMG parameters during local muscle fatigue. Muscle Nerve 16: 849–856
Öberg T, Sandsjö L, Kadefors R (1994) EMG mean power frequency: obtaining a reference value. Clin Biomech 9: 253–257
Petrofsky JS (1979) Frequency and amplitude analysis of the EMG during exercise on the bicycle ergometer. Eur J Appl Physiol 41: 1–15
Petrofsky JS, Lind AR (1980) Frequency analysis of the surface electromyogram during sustained isometric contractions. Eur J Appl Physiol 43: 173–182
Sady SP, Carpenter MW, Sady MA, Haydon B, Hoegsberg B, Cullinane EM, Thompson PD, Coustan DR (1988) Prediction of V02 max during cycle exercise in pregnant women. J Appl Physiol 65: 657–661
Taylor AD, Bronks R (1995) Reproductibility and validity of the quadriceps muscle integrated electromyogram threshold during incremental cycle ergometry. Eur J Appl Physiol 70: 252–257
Veiersted KB (1991) The reproducibility of test contractions for calibration of electromyographic measurements. Eur J Appl Physiol 62: 91–98
Vigreux B, Cnockaert JC, Pertuzon E (1979) Factors influencing quantified surface EMGs. Eur J Appl Physiol 41: 119–129
Viitasalo JHT, Komi PV (1975) Signal characteristics of EMG with special reference to reproducibility of measurements. Acta Physiol Scand 93: 531–539
Viitasalo JHT, Luhtanen P, Rahkila P, Rusko H (1985) Electromyographic activity related to aerobic and anaerobic thresholds in ergometer bicycling. Acta Physiol Scand 124: 287–293
Yang JF, Winter DA (1983) Electromyography reliability in maximal and submaximal isometric contractions. Arch Phys Med Rehabil 64: 417–420
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Gamet, D., Duchêne, J. & Goubel, F. Reproducibility of kinetics of electromyogram spectrum parameters during dynamic exercise. Europ. J. Appl. Physiol. 74, 504–510 (1996). https://doi.org/10.1007/BF02376765
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DOI: https://doi.org/10.1007/BF02376765