caa a22 4500 465783686 CHVBK 20180323112002.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF02446157 doi (NATIONALLICENCE)springer-10.1007/BF02446157 EMG power spectrum as a measure of muscular fatigue at different levels of contraction [Elektronische Daten] [S. Nagata, A. Arsenault, D. Gagnon, G. Smyth, P. Mathieu] The shift in the power spectrum resulting from a 5-7 min fatigue-inducing effort followed by a 1-2 min recovery period of two elbow flexors, the biceps brachii (BB) and the brachio-radialis (BR), was assessed using two variables, the mean frequency Fm and the median or central frequency Fmd. These two variables were calculated in pre- and post-fatigue conditions and following a brief recovery, at four levels, namely 20, 40, 60 and 80 per cent of maximum voluntary contraction (MVC). These were taken from a ramped isometric effort that is from 0 to 100 per cent MVC. The EMG activity of the two flexors was recorded with bipolar surface electrodes from a group of ten volunteers. Following muscle fatigue, induced with a maintained 60 per cent MVC isometric contraction, a statistically significant (p<0·05) shift towards the lower frequencies was observed for both Fm and Fmd for both muscles. Following a brief recovery, a shift towards the pre-fatigue higher frequencies was statistically significant (p<0·05). These two synergists responded to muscle fatigue and recovery similarly, as they both demonstrated parallel shifts in power spectrum. The power spectrum is consequently a reliable measure of muscular fatigue. It is also complementary to the net articular moment results. IFMBE, 1990 Electromyography nationallicence Muscular fatigue nationallicence Power spectrum nationallicence Nagata S. Department of Physical Education, University of Montreal, CP 6128, Succursele A, H3C 3J7, Montreal, Quebec, Canada aut Arsenault A. School of Behabilitation, Faculty of Medicine, University of Montreal, CP 6128, Succursale A, H3C 3J7, Montreal, Quebec, Canada aut Gagnon D. Department of Physical Education, University of Montreal, CP 6128, Succursele A, H3C 3J7, Montreal, Quebec, Canada aut Smyth G. Department of Physical Education, University of Montreal, CP 6128, Succursele A, H3C 3J7, Montreal, Quebec, Canada aut Mathieu P. Research Center, Rehabilitation Institute of Montreal, 6300 Avenue Darlington, H3S 2J4, Montreal, Quebec, Canada aut Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/4(1990-07-01), 374-378 0140-0118 28:4<374 1990 28 11517 https://doi.org/10.1007/BF02446157 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02446157 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nagata S. Department of Physical Education, University of Montreal, CP 6128, Succursele A, H3C 3J7, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Arsenault A. School of Behabilitation, Faculty of Medicine, University of Montreal, CP 6128, Succursale A, H3C 3J7, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Gagnon D. Department of Physical Education, University of Montreal, CP 6128, Succursele A, H3C 3J7, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Smyth G. Department of Physical Education, University of Montreal, CP 6128, Succursele A, H3C 3J7, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Mathieu P. Research Center, Rehabilitation Institute of Montreal, 6300 Avenue Darlington, H3S 2J4, Montreal, Quebec, Canada aut NATIONALLICENCE 773 0- Medical and Biological Engineering and Computing Kluwer Academic Publishers 28/4(1990-07-01), 374-378 0140-0118 28:4<374 1990 28 11517 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer