Twelve weeks of sprint interval training increases peak cardiac output in previously untrained individuals

Introduction Sprint interval training (SIT), characterized by brief bouts of ‘supramaximal’ exercise interspersed with recovery periods, increases peak oxygen uptake (%${\dot{\text{V}}}{\text{O}}_{2{\text{peak}}} %$) despite a low total exercise volume. Per the Fick principle, increased %${\dot{\tex...
Ausführliche Beschreibung

Introduction Sprint interval training (SIT), characterized by brief bouts of ‘supramaximal’ exercise interspersed with recovery periods, increases peak oxygen uptake (%${\dot{\text{V}}}{\text{O}}_{2{\text{peak}}} %$) despite a low total exercise volume. Per the Fick principle, increased %${\dot{\text{V}}}{\text{O}}_{2{\text{peak}}} %$ is attributable to increased peak cardiac output (%${\dot{{Q}}}_{\text{peak}} %$) and/or peak arterio-venous oxygen difference (a-$ vO_{2diff} $). There are limited and equivocal data regarding the physiological basis for SIT-induced increases in %${\dot{\text{V}}}{\text{O}}_{2{\text{peak}}} %$, with most studies lasting ≤ 6 weeks. Purpose To determine the effect of 12 weeks of SIT on %${\dot{{Q}}}_{\text{peak}} %$, measured using inert gas rebreathing, and the relationship between changes in %${\dot{{Q}}}_{\text{peak}} %$ and %${\dot{\text{V}}}{\text{O}}_{2{\text{peak}}} %$. Methods 15 healthy untrained adults [6 males, 9 females; 21 ± 2 y (mean ± SD)] performed 28 ± 3 training sessions. Each session involved a 2-min warm-up at 50 W, 3 × 20-s ‘all-out’ cycling bouts (581 ± 221 W) interspersed with 2-min of recovery, and a 3-min cool-down at 50 W. Results Measurements performed before and after training showed that 12 weeks of SIT increased %${\dot{{Q}}}_{\text{peak}} %$ (17.0 ± 3.7 vs 18.1 ± 4.6 L/min, p = 0.01, partial η2 = 0.28) and %${\dot{\text{V}}}{\text{O}}_{2{\text{peak}}} %$ (2.63 ± 0.78 vs 3.18 ± 1.1 L/min, p < 0.01, partial η2 = 0.58). The changes in these two variables were correlated (r2 = 0.46, p < 0.01). Calculated peak a-$ vO_{2diff} $ also increased after training (154 ± 22 vs 174 ± 23 ml $ O_{2} $/L; p < 0.01) and was correlated with the change in %${\dot{\text{V}}}{\text{O}}_{2{\text{peak}}} %$ (r2 = 0.33, p = 0.03). Exploratory analyses revealed an interaction (p < 0.01) such that %${\dot{{Q}}}_{\text{peak}} %$ increased in male (+ 10%, p < 0.01) but not female participants (+ 0.6%, p = 0.96), suggesting potential sex-specific differences. Conclusion Twelve weeks of SIT increased %${\dot{{Q}}}_{\text{peak}} %$ by 6% in previously untrained participants and the change was correlated with the larger 21% increase in %${\dot{\text{V}}}{\text{O}}_{2{\text{peak}}} %$. Ausführliche Beschreibung

Autor*in:	Bostad, William [verfasserIn] Valentino, Sydney E. [verfasserIn] McCarthy, Devin G. [verfasserIn] Richards, Douglas L. [verfasserIn] MacInnis, Martin J. [verfasserIn] MacDonald, Maureen J. [verfasserIn] Gibala, Martin J. [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2021

Schlagwörter:	Exercise Peak oxygen uptake Inert gas rebreathing Central adaptations Peripheral adaptations

Anmerkung:	© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021

Übergeordnetes Werk:	Enthalten in: European journal of applied physiology - Berlin : Springer, 1928, 121(2021), 9 vom: 20. Mai, Seite 2449-2458
Übergeordnetes Werk:	volume:121 ; year:2021 ; number:9 ; day:20 ; month:05 ; pages:2449-2458

Links:	Volltext

DOI / URN:	10.1007/s00421-021-04714-4

Katalog-ID:	SPR044800401