caa a22 4500 467940835 CHVBK 20180406153012.0 cr unu---uuuuu 170328e20060401xx s 000 0 eng 10.1007/s00421-005-0130-4 doi (NATIONALLICENCE)springer-10.1007/s00421-005-0130-4 Cardiac vagal outflow after aerobic training by analysis of high-frequency oscillation of the R-R interval [Elektronische Daten] [Antti Kiviniemi, Arto Hautala, Timo Mäkikallio, Tapio Seppänen, Heikki Huikuri, Mikko Tulppo] This study was designed to assess the effect of aerobic training on the dynamics between the R-R interval length and the high-frequency (HF) oscillation of the R-R interval. Seventeen healthy males (26±2years) participated in an 8-week aerobic training intervention. The mean HF spectral power (0.15-0.4Hz) of the R-R interval and the mean R-R interval length were analyzed from 24-h recordings. HF power was also analyzed in 5-min sequences and plotted as a function of the corresponding mean R-R interval length. The relationship between the R-R interval length and the HF power was analyzed by a quadratic regression model. The relationship was defined as saturated if the distinct deflection point of the model occurred before the maximum R-R interval. Otherwise, the relationship was defined as linear. Additionally, the mean HF power was calculated from the linear portion of the R-R interval versus the HF power regression curve (HF index). Before the training intervention, seven subjects had a saturated HF power. After the intervention, five new cases of saturated HF power were observed. The mean HF power of the 24-h recording did not change in the group with a saturated HF power before training (7.4±0.8vs. 7.6±0.8ms2), but the HF index increased (6.7±0.7 vs. 7.1±0.7ms2, P<0.05). We conclude that enhanced vagal activity due to aerobic training increases the prevalence of the saturation of the HF oscillation of the R-R interval variability in healthy subjects. HF power calculated from unsaturated area detects more accurately subtle changes in the vagally mediated beat-to-beat variability of the R-R interval after aerobic training than the mean 24-h HF power. Springer-Verlag, 2006 Heart rate variability nationallicence Cardiovascular regulation nationallicence Vagal activity nationallicence Kiviniemi Antti Merikoski Rehabilitation and Research Center, Kasarmintie 13, P.O.Box 404, 90101, Oulu, Finland aut Hautala Arto Merikoski Rehabilitation and Research Center, Kasarmintie 13, P.O.Box 404, 90101, Oulu, Finland aut Mäkikallio Timo Lapland Central Hospital, Rovaniemi, Finland aut Seppänen Tapio Department of Electrical and Information Engineering, University of Oulu, Oulu, Finland aut Huikuri Heikki Division of Cardiology, Department of Medicine, University of Oulu, Oulu, Finland aut Tulppo Mikko Merikoski Rehabilitation and Research Center, Kasarmintie 13, P.O.Box 404, 90101, Oulu, Finland aut European Journal of Applied Physiology Springer-Verlag 96/6(2006-04-01), 686-692 1439-6319 96:6<686 2006 96 421 https://doi.org/10.1007/s00421-005-0130-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-005-0130-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kiviniemi Antti Merikoski Rehabilitation and Research Center, Kasarmintie 13, P.O.Box 404, 90101, Oulu, Finland aut NATIONALLICENCE 700 1- Hautala Arto Merikoski Rehabilitation and Research Center, Kasarmintie 13, P.O.Box 404, 90101, Oulu, Finland aut NATIONALLICENCE 700 1- Mäkikallio Timo Lapland Central Hospital, Rovaniemi, Finland aut NATIONALLICENCE 700 1- Seppänen Tapio Department of Electrical and Information Engineering, University of Oulu, Oulu, Finland aut NATIONALLICENCE 700 1- Huikuri Heikki Division of Cardiology, Department of Medicine, University of Oulu, Oulu, Finland aut NATIONALLICENCE 700 1- Tulppo Mikko Merikoski Rehabilitation and Research Center, Kasarmintie 13, P.O.Box 404, 90101, Oulu, Finland aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 96/6(2006-04-01), 686-692 1439-6319 96:6<686 2006 96 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer