caa a22 4500 469054123 CHVBK 20180323132838.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF01466266 doi (NATIONALLICENCE)springer-10.1007/BF01466266 Muscle sound and electromyogram spectrum analysis during exhausting contractions in man [Elektronische Daten] [C. Orizio, R. Perini, B. Diemont, A. Veicsteinas] Summary: The changes in the soundmyogram (SMG) and electromyogram (EMG) frequency content during exhausting contractions at 20070, 40%, 60070 and 80% of the maximal voluntary contraction (MVC) were investigated by the spectral analysis of the SMG and EMG detected from the biceps brachii muscles of 13 healthy men The root mean squares (rms) of the two signals were also calculated. Throughout contraction the EMG rms always increased while this was true only at 20% MVC for the SMG. A marked decrease was detected at 60% and 80% MVC. With fatigue the EMG spectra presented a compression towards the lower frequencies at all exercise intensities. The SMG showed a more complex behaviour with a transient increase in its frequency content, followed by a continuous compression of the spectra, at 60% and 80% MVC, and a nearly stable frequency content at lower contraction intensities. This study suggested that different aspects of the changes in the motor unit's activation strategy at different levels of exhausting contractions can be monitored by SMG and EMG signals. Springer-Verlag, 1992 Muscle sound nationallicence Electromyogram nationallicence Recruitment nationallicence Localized muscle fatigue nationallicence Orizio C. Istituto di Fisiologia Umana, Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Via Valsabbina 19, 1-25123, Brescia, Italy aut Perini R. Istituto di Fisiologia Umana, Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Via Valsabbina 19, 1-25123, Brescia, Italy aut Diemont B. Istituto di Fisiologia Umana, Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Via Valsabbina 19, 1-25123, Brescia, Italy aut Veicsteinas A. Istituto di Fisiologia Umana, Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Via Valsabbina 19, 1-25123, Brescia, Italy aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/1(1992-01-01), 1-7 0301-5548 65:1<1 1992 65 421 https://doi.org/10.1007/BF01466266 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01466266 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Orizio C. Istituto di Fisiologia Umana, Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Via Valsabbina 19, 1-25123, Brescia, Italy aut NATIONALLICENCE 700 1- Perini R. Istituto di Fisiologia Umana, Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Via Valsabbina 19, 1-25123, Brescia, Italy aut NATIONALLICENCE 700 1- Diemont B. Istituto di Fisiologia Umana, Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Via Valsabbina 19, 1-25123, Brescia, Italy aut NATIONALLICENCE 700 1- Veicsteinas A. Istituto di Fisiologia Umana, Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Via Valsabbina 19, 1-25123, Brescia, Italy aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/1(1992-01-01), 1-7 0301-5548 65:1<1 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer