Abstract
The active orthostatic stress (AOE), induced by active standing, and the heart rate recovery (HRR) after exercise testing are markers of the cardiac autonomic function (CAF). It is not clear whether HRR after submaximal exercise testing (SET) is associated with CAF responsiveness to AOE. PURPOSE: We aim to correlate the CAF responsiveness to AOE with the HRR after submaximal SET in active men. METHODS: We evaluated 24 active men according to the IPAQ-questionnaire, aged 27 ± 4,4 yrs and with BMI = 24,8 ± 1,8 kg/m2. CAF was assessed by 5-min heart rate variability (HRV) at rest supine and orthostatic postures by the rMSSD index and by the SD1 index during the 5-min recovery period after SET, using the Polar RS800® to RR-interval acquisition and the Kubios software for analyses. The HRR was calculated as the absolute (Abs) and relative (Rel) differences from peak HR at ET minus HR at 1st to 5th min of active recovery at 2.4 km/h and 2.5% grade (HRR1 to HRR5). CAF responsiveness was estimated by the Abs variation of rMSSD and SD1 from supine to orthostatic postures. Due to non-normal distribution of variables (Shapiro-Wilk test) we used the Spearman correlation at the 5% level of significance. RESULTS: We observed a positive correlation between rMSSD and SD1 variations after AOE and HRR, in almost every moments from min 1 to min 5, as shown in Table 1.Table 01: Correlation between resting CAF responsiveness and HRR during a 5 min of recovery periodCONCLUSION: We found significant positive correlation between the resting CAF vagal responsiveness and HRR after SET in active men. Our results reinforce the hypothesis that the capacity to re-establish HR to the baseline levels after submaximal efforts, which has been shown to be a cardiovascular risk marker, could be predicted by the vagal CAF responsiveness to AOE.
Published Version
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