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Changes in aerobic capacity and glycaemic control in response to reduced-exertion high-intensity interval training (REHIT) are not different between sedentary men and women

Metcalfe, Richard, Tardif, Nicholas, Thompson, Dylan and Vollaard, Niels (2016) Changes in aerobic capacity and glycaemic control in response to reduced-exertion high-intensity interval training (REHIT) are not different between sedentary men and women. Applied Physiology, Nutrition, and Metabolism, 41 (11). pp. 1117-1123. [Journal article]

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DOI: 10.1139/apnm-2016-0253

Abstract

Purpose: Previously it has been reported that reduced-exertion high-intensity intervaltraining (REHIT; total training time of 3x10 min per week) improves aerobic capacity(V̇O2max) in both sedentary men and women, but improves insulin sensitivity in men only.The aim of the present study was to determine whether there is a true sex difference inresponse to REHIT, or that these findings can be explained by the large interindividualvariability in response inherent to all exercise training.Methods: Thirty-five sedentary participants (18 women; mean±SD age for men and womenrespectively: 33±9 and 36±9 y, BMI: 25.1±2.1 and 24.1±3.5 kg�m-2, V̇O2max: 38.6±8.3 and 31.6±4.6 ml�kg-1�min-1) completed a 6-week REHIT programme consisting of eighteen 10-min unloaded cycling sessions with one (first session) or two (all other sessions) 'all-out' 10-20-s sprints against a resistance of 5% of body mass. V̇O2max and oral glucose tolerancetest (OGTT)-derived insulin sensitivity were determined before and after training.Results: REHIT was associated with an increase in V̇O2max (2.54±0.65 vs. 2.78±0.68L�min-1, main effect of time: p<0.01), a trend toward reduced plasma insulin area-under-thecurve (AUC; 6.7±4.8 vs. 6.1±4.0 iU·min-1·ml-1, p=0.096), but no significant change in plasma glucose AUC or the Cederholm index of insulin sensitivity. Substantial interindividual variability in response to REHIT was observed for all variables, but there was no significant effect of sex.Conclusions: REHIT improves the key health marker of aerobic capacity within a minimal total training time-commitment. There is large interindividual variability in responses to REHIT, but sex differences in the responses are not apparent.

Item Type:Journal article
Keywords:HIT; V̇O2max; insulin sensitivity; sex differences
Faculties and Schools:Faculty of Life and Health Sciences > School of Sport
Faculty of Life and Health Sciences
Research Institutes and Groups:Sport and Exercise Sciences Research Institute
Sport and Exercise Sciences Research Institute > Centre for Physical Activity and Health
ID Code:35241
Deposited By: Mr Richard Metcalfe
Deposited On:01 Aug 2016 08:23
Last Modified:17 Oct 2017 16:24

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