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On‐ and Off‐responses of Heart Rate to Exercise – Relations to Heart Rate Variability by Michal Javorka; Ivan Žila; Tomáš Balhárek; Kamil Javorka is a Medicine article available to read on EtoBox.

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## Summary During physical exercise, heart rate (HR) increases by parasympathetic withdrawal and increase of sympathetic activity to the heart. HR variability (HRV) in time and frequency domains provides information about autonomic control of the cardiovascular system. Non‐linear analysis using the Poincaré plot method is able to reveal supplementary information about cardiac autonomic control. The aim of this study was to determine the association between HRV parameters, the initial increase of HR at the onset of exercise (on‐response) and HR decrease in the recovery phase after acute exercise (off‐response). HR was continuously monitored in 17 healthy male subjects (mean age: 20·3 ± 0·2 (SEM) years) at rest (25 min supine; 5 min standing), during exercise (8 min of step test at 70% of maximal power output) and in the recovery phase (30 min supine). HRV analysis in time and frequency domains and evaluation of the Poincaré plot measures (length, widths) were performed on selected segments of HR time series. HR on‐ and off‐responses were quantified using an exponential curve fitting technique. The time constants __T__~on~ and __T__~off~, representing the rate of on‐ and off‐response

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Author

Michal Javorka; Ivan Žila; Tomáš Balhárek; Kamil Javorka

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0144-5979)

Published

2003

Language

EN

Field

Medicine (Health Sciences)