Oxygen consumption, substrate oxidation, and blood pressure following sprint interval exercise
Publication: Applied Physiology, Nutrition, and Metabolism
8 February 2013
Abstract
This study examined the acute effect of sprint interval exercise (SIE) on postexercise oxygen consumption, substrate oxidation, and blood pressure. The participants were 10 healthy males aged 21–27 years. Following overnight fasts, each participant undertook 2 trials in a random balanced order: (i) four 30-s bouts of SIE on a cycle ergometer, separated by 4.5 min of recovery, and (ii) resting (control) in the laboratory for an equivalent period. Time-matched measurements of oxygen consumption, respiratory exchange ratio, and blood pressure were made for 2 h into recovery. Total 2-h oxygen consumption was significantly higher in the SIE than in the control trial (mean ± SD: Control: 31.9 ± 6.7 L vs Exercise: 45.5 ± 6.8 L, p < 0.001). The rate of fat oxidation was 75% higher 2 h after the exercise trial compared with the control trial (Control: 0.08 ± 0.05 g·min−1 vs Exercise: 0.14 ± 0.06 g·min−1, p = 0.035). Systolic blood pressure (Control: 117 ± 8 mm Hg vs Exercise: 109 ± 8 mm Hg, p < 0.05) and diastolic blood pressure (Control: 84 ± 6 mm Hg vs Exercise: 77 ± 5 mm Hg, p < 0.05) were significantly lower 2 h after the exercise trial compared with the control trial. These data showed a 42% increase in oxygen consumption (∼13.6 L) over 2 h after a single bout of SIE. Moreover, the rate of fat oxidation increased by 75%, whereas blood pressure was reduced by ∼8 mm Hg 2 h after SIE. Whether these acute benefits of SIE can translate into long-term changes in body composition and an improvement in vascular health needs investigation.
Résumé
Cette étude analyse l'effet immédiat de sprints effectués par intervalle (« SIE ») sur la consommation d'oxygène, l'oxydation des substrats et la pression sanguine au cours de la période de récupération. Dix hommes âgés de 21 à 27 ans et en bonne santé participent à cette étude. Après un jeûne d'une nuit, les sujets participent à deux essais selon un ordre aléatoire contrebalancé :(i) 4 exercices de SIE sur cycloergomètre d'une durée de 30 s intercalés de 4,5 min de repos ou (ii) repos (contrôle) d'une même durée dans un laboratoire. Pendant 2 h au cours de la récupération, on évalue au même moment pour les deux essais la consommation d'oxygène, le ratio d'échanges gazeux et la pression sanguine. La consommation totale d'oxygène mesurée durant 2 h au cours de la récupération est significativement supérieure dans la condition SIE que dans la condition de contrôle : moyenne ± écart type, (contrôle) 31,9 ± 6,7 L vs (SIE) 45,5 ± 6,8 L (p < 0,001). Au cours des 2 h suivant la fin de l'exercice, le taux d'oxydation des graisses est de 75% supérieur à la condition de contrôle : 0,14 ± 0,06 g·min−1 vs 0,08 ± 0,05 g·min−1, respectivement (p = 0,035). Au cours de cette même période les pressions systolique (contrôle: 117 ± 8 mm Hg vs SIE: 109 ± 8 mm Hg, p < 0,05) et diastolique (contrôle: 84 ± 6 mm Hg vs SIE: 77 ± 5 mm Hg, p < 0,05) sont significativement inférieures. Ces observations révèlent une augmentation de 42 % de la consommation d'oxygène (∼13,6 L) durant 2 h à la suite d'une seule séance de SIE. En outre, le taux d'oxydation des gras augmente de 75 % pendant que la pression sanguine diminue de ∼8 mm Hg deux heures après SIE. Il reste à démontrer que les bienfaits immédiats de SIE ont des répercussions à long terme sur la modification de la composition corporelle et l'amélioration de la santé vasculaire.
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Published In
Applied Physiology, Nutrition, and Metabolism
Volume 38 • Number 2 • February 2013
Pages: 182 - 187
History
Received: 13 April 2012
Accepted: 29 August 2012
Published online: 8 February 2013
Copyright
© 2013.
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ChanHuan Hao and BurnsStephen Francis. 2013. Oxygen consumption, substrate oxidation, and blood pressure following sprint interval exercise. Applied Physiology, Nutrition, and Metabolism.
38(2): 182-187. https://doi.org/10.1139/apnm-2012-0136
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