Background Regular exercise promotes functional and structural changes in the central and
peripheral mechanisms of the cardiovascular system. Heart rate variability (HRV) …

The autonomic nervous system controls the smooth muscles of the internal organs, the
cardiovascular system and the secretory function of the glands and plays a major role in the …

Background: Physiological aging leads to cardiac autonomic dysfunction, which is
associated with the onset and worsening of cardiovascular disease and an increased risk of …

Seven healthy young men were submitted twice to a hypoxia tolerance test at a simulated
altitude (3000m). Their first acute exposure was in a hypobaric chamber; and the second, in …

The study investigated whether supine-measured HRV indicators, and/or HRV indicators
measured during orthostatic stress are related to conventional measures of exercise and …

Background Deceleration capacity (DC) of heart rate is a measure of cardiac vagal
modulation. This study introduced a DC adaptation (Modified Index) that measured the …

Abstract Hebisz, R, Hebisz, P, Danek, N, Michalik, K, and Zatoń, M. Predicting changes in
maximal oxygen uptake in response to polarized training (sprint interval training, high …

FUNDAMENTO: O envelhecimento fisiológico leva a uma disfunção autonômica cardíaca
que está associada ao surgimento e ao agravamento de doenças cardiovasculares e a um …

The assessment of aerobic fitness through the measurement of maximum oxygen
consumption (VO2 max) is an objective parameter that integrates cardiovascular, respiratory …

This study aimed to determine a model for stratifying the maximum oxygen uptake (VO 2
max) based on heart rate variability (HRV) parameters at rest. It was applied 70 young adult …