caa a22 4500 469054018 CHVBK 20180323132838.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF01466267 doi (NATIONALLICENCE)springer-10.1007/BF01466267 Heart rate overshoot at the beginning of muscle exercise [Elektronische Daten] [P. Feroldi, M. Belleri, G. Ferretti, A. Veicsteinas] Summary: A characteristic notch in the heart rate (f c) on-response at the beginning of square-wave exercise is described in 7 very fit marathon runners and 12 sedentary young men, during cycle tests at 30% and 60% of maximal oxygen consumption (VO2max). The (f c) notch revealed af c overshoot with respect to the (f c) values predicted from exponential beat-by-beat fitted models. While at 30% of (VO2max). all subjects showed af c over-shoot, at 60% of (VO2max). it occurred in the marathon runners but not in the sedentary subjects. The mean time of occurrence of thef c overshoot from the onset of the exercise was 16.7 (SD 4.7) s and 12.2 (SD 3.2) s at 30% of (VO2max). in the runners and the sedentary subjects respectively, and 23.8 (SD 8.8) s at 60% of (VO2max). in the runners. The amplitude of the overshoot, with respect to rest, was 41 (SD 12) beats·min−1and 31 (SD 4) beats·min−1 at 30% of (VO2max). in the runners and the sedentary subjects respectively, and 46 (SD 19) beats·min−1 at 60% of (VO2max). in the runners. The existence and the amplitude of thef c overshoot may have been related to central command and muscle heart reflex mechanisms and thus may have been indicators of changes in the balance between sympathetic and parasympathetic activity occurring in fit and unfit subjects. Springer-Verlag, 1992 Exertion - Heart rate control system nationallicence Heart rate overshoot nationallicence Square-wave exercise nationallicence Feroldi P. Institute of Physiology, Department of Biomedical Sciences and Biotechnologies, University of Brescia, via Valsabbina 19, Brescia, Italy aut Belleri M. Institute of Physiology, Department of Biomedical Sciences and Biotechnologies, University of Brescia, via Valsabbina 19, Brescia, Italy aut Ferretti G. Department of Physiology, Centre Médical Universitaire, 1211, Genève 4, Switzerland aut Veicsteinas A. Institute of Physiology, Department of Biomedical Sciences and Biotechnologies, University of Brescia, via Valsabbina 19, Brescia, Italy aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/1(1992-01-01), 8-12 0301-5548 65:1<8 1992 65 421 https://doi.org/10.1007/BF01466267 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01466267 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Feroldi P. Institute of Physiology, Department of Biomedical Sciences and Biotechnologies, University of Brescia, via Valsabbina 19, Brescia, Italy aut NATIONALLICENCE 700 1- Belleri M. Institute of Physiology, Department of Biomedical Sciences and Biotechnologies, University of Brescia, via Valsabbina 19, Brescia, Italy aut NATIONALLICENCE 700 1- Ferretti G. Department of Physiology, Centre Médical Universitaire, 1211, Genève 4, Switzerland aut NATIONALLICENCE 700 1- Veicsteinas A. Institute of Physiology, Department of Biomedical Sciences and Biotechnologies, University of Brescia, via Valsabbina 19, Brescia, Italy aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/1(1992-01-01), 8-12 0301-5548 65:1<8 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 214669769 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer