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Physiol Rep. 2017 Apr;5(7). pii: e13232. doi: 10.14814/phy2.13232.

High-intensity interval training improves performance in young and older individuals by increasing mechanical efficiency.

Author information

1
School of Kinesiology and Leisure, Faculty of Health Sciences and Community Services, Université de Moncton, Moncton, New Brunswick, Canada georgesjabbour1980@hotmail.com.
2
School of Kinesiology and Leisure, Faculty of Health Sciences and Community Services, Université de Moncton, Moncton, New Brunswick, Canada.
3
Department of Kinesiology, Université Laval, Québec, Canada.
4
Department of Biology, Faculty of Sciences, Université de Moncton, Moncton, New Brunswick, Canada.

Abstract

This study evaluated the effects of 6 weeks of high-intensity interval training (HIIT) on mechanical efficiency (ME) in young and older groups. Seventeen healthy young adults [26.2(2.4) year], and thirteen healthy older adults [54.5(2.3) year] completed a 6-week HIIT intervention (three sessions per week) on an electromagnetically braked cycle ergometer. Each HIIT session contained six repetitions of supramaximal exercise intervals (6 seconds each) with 2 min of passive recovery between each repetition. ME (%) were computed in net terms across stages corresponding to ventilator thresholds 1 (VT1) and 2 (VT2) and at 100% of maximal oxygen consumption (VO2max) of an incremental maximal cycling test. After 6 weeks, the ME values did not differ between the two groups and were significantly higher than the ones at baseline (< 0.01). In this study, the multiple linear regression analysis demonstrated the increases in maximal power (Pmax) contributed significantly to ME increases over 6 weeks at VT1, VT2 and at 100% of VO2max This model accounted respectively for 28, 38, and 42%, of the increases. In older adults, ME determined during incremental maximal cycling test increases at VT1, VT2 and at 100% over 6-week HIIT intervention, and the increment appeared to be related to increases in Pmax. HIIT can be recommended as a strategy aimed at improving muscle efficiency among older adults.

KEYWORDS:

Energy expenditure; mechanical efficiency; power; ratings of perceived‐exertion; ventilator thresholds 1; ventilator thresholds 2

PMID:
28381445
PMCID:
PMC5392519
DOI:
10.14814/phy2.13232
[Indexed for MEDLINE]
Free PMC Article

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