Author: Raleigh, J.P.; Giles, M.D.; Scribbans, T.D.; Edgett, B.A.; Sawula, L.J.; Bonafiglia, J.T.; Graham, R.B.; Gurd, B.J.
Description: High-intensity interval training (HIIT) improves peak oxygen uptake (VO2peak) and oxygen uptake (VO2) kinetics, however, it is unknown whether an optimal intensity of HIIT exists for eliciting improvements in these measures of whole-body oxidative metabolism. The purpose of this study was to (i) investigate the effect of interval intensity on training-induced adaptations in VO2peak and VO2 kinetics, and (ii) examine the impact of interval intensity on the frequency of nonresponders in VO2peak. Thirty-six healthy men and women completed 3 weeks of cycle ergometer HIIT, consisting of intervals targeting 80% (LO), 115% (MID), or 150% (HI) of peak aerobic power. Total work performed per training session was matched across groups. A main effect of training (p < 0.05) and a significant interaction effect was observed for VO2peak, with the change in VO2peak being greater (p < 0.05) in the MID group than the LO group; however, no differences were observed between the HI group and either the MID or LO groups (DeltaVO2peak; LO, 2.7 +/- 0.7 mL.kg(-1).min(-1); MID, 5.8 +/- 0.7; HI, 4.2 +/- 1.0). The greatest proportion of responders was observed in the MID group (LO, 8/12; MID, 12/13; HI, 9/11). A nonsignificant relationship (p = 0.26; r(2) = 0.04) was found between the changes in VO2peak and tauVO2. These results suggest that training at intensities around VO2peak may represent a threshold intensity above which further increases in training intensity provide no additional adaptive benefit. The dissociation between changes in VO2peak and VO2 kinetics also reflects the different underlying mechanisms regulating these adaptations.
Subject headings: Adaptation, Physiological; Adolescent; Adult; Body Mass Index; Energy Metabolism; Exercise/physiology; Exercise Test; Female; High-Intensity Interval Training; Humans; Male; Oxygen Consumption; Physical Endurance; Surveys and Questionnaires; Young Adult; Hiit; VO2 kinetics; VO2peak; exercise training; intensity; nonresponders; work-matched
Subject headings:
Publication year: 2016
Journal or book title: Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition et Metabolisme
Volume: 41
Issue: 7
Pages: 706-713
Find the full text : https://tspace.library.utoronto.ca/bitstream/1807/72825/1/apnm-2015-0614.pdf
Find more like this one (cited by): https://scholar.google.com/scholar?cites=4121015791881826740&as_sdt=1000005&sciodt=0,16&hl=en
Type: Journal Article
Serial number: 2267