Open AccessHigh‐intensity interval training improves acute plasma volume responses to exercise that is age dependent
Author(s) -
Jabbour Georges,
Iancu HoriaDaniel,
Zouhal Hassane,
Mauriège Pascale,
Joanisse Denis R.,
Martin Luc J.
Publication year - 2018
Publication title -
physiological reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 39
ISSN - 2051-817X
DOI - 10.14814/phy2.13609
Subject(s) - the arts , library science , kinesiology , medicine , humanities , art , medical education , computer science , visual arts
Plasma volume ( PV ) is affected by several factors including age, physical training and, acutely, by exercise intensity. The purpose of this study was to investigate the effects of 6 weeks of high‐intensity interval training ( HIT ) on PV and blood pressure ( BP ) changes among sedentary individuals. Thirty subjects aged between 18 and 71 years [body mass index=30.1(1.2) kg/m 2 ] completed a 6‐weeks HIT program. Anthropometric and fitness variables were obtained at pre‐ and post‐ HIT . PV variations during warm‐up and after supramaximal cycling test ( SCT ) were calculated using two methods based on Hematocrit (Ht) and Hemoglobin (Hb) measures. After both the warm‐up and SCT , PV decreased significantly among participants at pre‐ and at post‐ HIT ( P < 0.01). However, PV decreases were significantly greater at pre‐ HIT compared with post‐ HIT during warm‐up and after SCT ( P < 0.01, respectively). In addition, at pre‐ HIT , a positive relationship was found between age and both PV variations at warm‐up and after SCT ( r 2 = 0.55 and r 2 = 0.46; P < 0.01 respectively). However, no relationship was found during the post‐ HIT period. After SCT and after both visits, only body weight predicted 22% of PV variations. In the current study, a significant relationship was found between systolic and diastolic BP improvements and PV variations in post‐ HIT ( r 2 = 0.54 and r 2 =0.56, P < 0.05, respectively). Our results suggest that HIT may improve PV values and reduce the effects of age on the decrease in PV . These interventions led to improvements in systolic and diastolic BP values among participants.