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Heterogeneity and incidence of non-response for changes in cardiorespiratory fitness following time-efficient sprint interval exercise training

Richard Metcalfe Orcid Logo, Niels BJ Vollaard

Applied Physiology, Nutrition, and Metabolism, Volume: 46, Issue: 7

Swansea University Author: Richard Metcalfe Orcid Logo

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DOI (Published version): 10.1139/apnm-2020-0855

Abstract

Interindividual variability for training-induced changes in maximal oxygen uptake (VO2max) is well described following continuous aerobic and high-intensity interval training. Whether similar variability is observed following time-efficient sprint interval training with minimal training volume (i.e....

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Published in: Applied Physiology, Nutrition, and Metabolism
ISSN: 1715-5312 1715-5320
Published: Canadian Science Publishing 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa56002
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Abstract: Interindividual variability for training-induced changes in maximal oxygen uptake (VO2max) is well described following continuous aerobic and high-intensity interval training. Whether similar variability is observed following time-efficient sprint interval training with minimal training volume (i.e., reduced-exertion high-intensity interval training; REHIT) is unknown. We conducted a pooled analysis of n=117 (68 men) training participants (mean±SD: age: 30±10 y; VO2max: 34.8±7.5 ml·kg-1·min-1), who completed a VO2max assessment before and 3 days after 6 weeks of REHIT comprising of two 10-20 second ‘all-out’ cycling sprints per session, and n=40 no-intervention control participants (age: 30±13 y; VO2max: 31.5±6.5 ml·kg-1·min-1) who completed repeated VO2max tests over a comparable timeframe. Individual responses estimated using 50% confidence intervals derived from the technical error were interpreted against a smallest worthwhile change (SWC) of 1.75 ml·kg-1·min-1. The standard deviation of individual responses was 2.39 ml·kg-1·min-1 demonstrating clinically meaningful heterogeneity in training-induced changes in VO2max following REHIT that exceed the technical, biological and random within-subjects variability of VO2max assessment. The likely (75% probability) non-response rate was 18% (21/117), and 49% (57/117) of individuals demonstrated increases in VO2max likely higher than the SWC. We conclude that the well-described increase in VO2max following REHIT at the group level is subject to substantial variability in magnitude at an individual level. This has important implications for exercise prescription and can be harnessed to elucidate mechanisms of adaptation.
Keywords: Aerobic Capacity; High-Intensity Interval Training; Sprint Interval Training; Individual Responses; Individual Variability; Cardiorespiratory Fitness
College: Faculty of Science and Engineering
Issue: 7

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