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Cardiovagal activity following acute sprint interval exercise (706.6)
Author(s) -
Olver T.,
Abbott Kolten,
Beaulieu Kristine,
Lemon Peter,
Shoemaker J.
Publication year - 2014
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.28.1_supplement.706.6
Subject(s) - baroreflex , sprint , medicine , heart rate variability , morning , heart rate , cardiology , treadmill , poincaré plot , anesthesia , physical therapy , blood pressure
The purpose of this study was to examine the impact of sprint interval exercise (SIE) on the time course of cardio‐autonomic recovery and vagal activity over a 24 h period. Eight healthy males (age=24.1±2.3 y) performed a single bout of SIE that included 4 x 30 s all out sprints interspersed by 4 min of recovery, performed on a manual treadmill. Following an overnight fast, measurements were taken at baseline (day 1; 8:00 a.m.), pre‐exercise (PRE‐X), immediately (PT‐X1), 90 (PT‐X2), 180 (PT‐X3) and 300 (PT‐X4) min post‐exercise as well as the following morning (day 2). Compared to PRE‐X, all spectral, time domain and Poincaré plot indices of heart rate variability (HRV) were reduced during PT‐X1‐3 (P蠄0.01). Baroreflex sensitivity was also depressed from PT‐X1‐4 (P<0.01). Relative to PRE‐X, plasma pancreatic polypeptide (PP; plasma indicator of vagal stimulation) was elevated at PT‐X1 (P=0.03). There were no differences in resting HRV, baroreflex sensitivity and plasma PP values between day 1 and 2 (P蠅0.12). These results indicate that despite an acute rise in plasma PP, there is a profound minimization of cardio‐vagal control following SIE. Cardio‐autonomic modulation recovers progressively and all indices of vagal activity are normalized by the following morning. Grant Funding Source : Supported by NSERC