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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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spelling 2024-12-20T11:52:54.0083087 v2 56002 2021-01-11 Heterogeneity and incidence of non-response for changes in cardiorespiratory fitness following time-efficient sprint interval exercise training 9bb783273dd9d54a2f3f66f75c43abdf 0000-0003-0980-2977 Richard Metcalfe Richard Metcalfe true false 2021-01-11 EAAS 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. Journal Article Applied Physiology, Nutrition, and Metabolism 46 7 Canadian Science Publishing 1715-5312 1715-5320 Aerobic Capacity; High-Intensity Interval Training; Sprint Interval Training; Individual Responses; Individual Variability; Cardiorespiratory Fitness 1 7 2021 2021-07-01 10.1139/apnm-2020-0855 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University 2024-12-20T11:52:54.0083087 2021-01-11T10:28:55.5957635 Faculty of Science and Engineering Richard Metcalfe 0000-0003-0980-2977 1 Niels BJ Vollaard 2 56002__19216__aa4c51555f084fed9af73d2ff6f40ab4.pdf 56002.pdf 2021-02-01T17:25:49.9641110 Output 178519 application/pdf Accepted Manuscript true true eng
title Heterogeneity and incidence of non-response for changes in cardiorespiratory fitness following time-efficient sprint interval exercise training
spellingShingle Heterogeneity and incidence of non-response for changes in cardiorespiratory fitness following time-efficient sprint interval exercise training
Richard Metcalfe
title_short Heterogeneity and incidence of non-response for changes in cardiorespiratory fitness following time-efficient sprint interval exercise training
title_full Heterogeneity and incidence of non-response for changes in cardiorespiratory fitness following time-efficient sprint interval exercise training
title_fullStr Heterogeneity and incidence of non-response for changes in cardiorespiratory fitness following time-efficient sprint interval exercise training
title_full_unstemmed Heterogeneity and incidence of non-response for changes in cardiorespiratory fitness following time-efficient sprint interval exercise training
title_sort Heterogeneity and incidence of non-response for changes in cardiorespiratory fitness following time-efficient sprint interval exercise training
author_id_str_mv 9bb783273dd9d54a2f3f66f75c43abdf
author_id_fullname_str_mv 9bb783273dd9d54a2f3f66f75c43abdf_***_Richard Metcalfe
author Richard Metcalfe
author2 Richard Metcalfe
Niels BJ Vollaard
format Journal article
container_title Applied Physiology, Nutrition, and Metabolism
container_volume 46
container_issue 7
publishDate 2021
institution Swansea University
issn 1715-5312
1715-5320
doi_str_mv 10.1139/apnm-2020-0855
publisher Canadian Science Publishing
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
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description 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.
published_date 2021-07-01T19:59:07Z
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