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Optimizing interval training through power output variation within the work intervals

Bossi, Arthur, Mesquida, Cristian, Passfield, Louis, Rønnestad, Bent R, Hopker, James G. (2020) Optimizing interval training through power output variation within the work intervals. International Journal of Sports Physiology and Performance, 15 (7). pp. 982-989. ISSN 1555-0265. (doi:10.1123/ijspp.2019-0260) (KAR id:77645)

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https://doi.org/10.1123/ijspp.2019-0260

Abstract

Maximal oxygen uptake (V̇O2max) is a key determinant of endurance performance. Therefore, devising high-intensity interval training (HIIT) that maximizes stress of the oxygen transport and utilization systems may be important to stimulate further adaptation in athletes. We compared physiological and perceptual responses elicited by work intervals matched for duration and mean power output, but differing in power output distribution. Methods. Fourteen cyclists (V̇O2max: 69.2 ± 6.6 ml·kg-1·min-1) completed three laboratory visits for a performance assessment and two HIIT sessions using either varied- or constant-intensity work intervals. Results. Cyclists spent longer time at >90%V̇O2max during HIIT with varied-intensity work intervals (410 ± 207 vs. 286 ± 162 s; P = 0.02), but there were no differences between sessions in heart rate- or perceptual-based training load metrics (all P ≥ 0.1). When considering individual work intervals, minute ventilation (V̇E) was higher in the varied-intensity mode (F = 8.42; P = 0.01), but not respiratory frequency, tidal volume, blood lactate concentration [La], ratings of perceived exertion, or cadence (all F ≤ 3.50; P ≥ 0.08). Absolute changes (Δ) between HIIT sessions were calculated per work interval, and Δ total oxygen uptake was moderately associated with ΔV̇E (r = 0.36; P = 0.002). Conclusions. In comparison to a HIIT session with constant-intensity work intervals, well-trained cyclists sustain higher fractions of V̇O2max when work intervals involve power output variations. This effect is partially mediated by an increased oxygen cost of hyperpnoea, and not associated with a higher [La], perceived exertion or training load metrics.

Item Type: Article
DOI/Identification number: 10.1123/ijspp.2019-0260
Uncontrolled keywords: intensity prescription; time at V̇O2max; elite cycling; maximal aerobic power; exercise hyperpnoea
Divisions: Divisions > Division of Natural Sciences > School of Sport and Exercise Sciences
Depositing User: Arthur Bossi
Date Deposited: 21 Oct 2019 08:04 UTC
Last Modified: 16 Feb 2021 14:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/77645 (The current URI for this page, for reference purposes)
Bossi, Arthur: https://orcid.org/0000-0002-4098-0192
Passfield, Louis: https://orcid.org/0000-0001-6223-162X
Hopker, James G.: https://orcid.org/0000-0002-4786-7037
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