title: Changes of heart rate variability in persons of different ages under the infl uence of stress factors
abstract: Influence of firewalking on the heart rate variability in 20–35 and 50–60 years old persons has been studied. The increase of heart rate by 15 % and changes in some heart rate variability indices have been found, particularly increase of vegetative balance index by 120–210 % and strain index by 150–260 %. Very low frequency and low frequency power spectral density also increase. Firewalking was found to be associated with strengthening of sympathetic influence and centralization of the regulator
journal: Теорія і методика фізичного виховання і спорту