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- Title
Twelve weeks of sprint interval training increases peak cardiac output in previously untrained individuals.
- Authors
Bostad, William; Valentino, Sydney E.; McCarthy, Devin G.; Richards, Douglas L.; MacInnis, Martin J.; MacDonald, Maureen J.; Gibala, Martin J.
- Abstract
Introduction: Sprint interval training (SIT), characterized by brief bouts of 'supramaximal' exercise interspersed with recovery periods, increases peak oxygen uptake ( V ˙ O 2 peak ) despite a low total exercise volume. Per the Fick principle, increased V ˙ O 2 peak is attributable to increased peak cardiac output ( Q ˙ peak ) and/or peak arterio-venous oxygen difference (a-vO2diff). There are limited and equivocal data regarding the physiological basis for SIT-induced increases in V ˙ O 2 peak , with most studies lasting ≤ 6 weeks. Purpose: To determine the effect of 12 weeks of SIT on Q ˙ peak , measured using inert gas rebreathing, and the relationship between changes in Q ˙ peak and V ˙ O 2 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 Q ˙ peak (17.0 ± 3.7 vs 18.1 ± 4.6 L/min, p = 0.01, partial η2 = 0.28) and V ˙ O 2 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-vO2diff also increased after training (154 ± 22 vs 174 ± 23 ml O2/L; p < 0.01) and was correlated with the change in V ˙ O 2 peak (r2 = 0.33, p = 0.03). Exploratory analyses revealed an interaction (p < 0.01) such that Q ˙ 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 Q ˙ peak by 6% in previously untrained participants and the change was correlated with the larger 21% increase in V ˙ O 2 peak .
- Subjects
HIGH-intensity interval training; CARDIAC output; COOLDOWN; ACTIVE recovery; NOBLE gases
- Publication
European Journal of Applied Physiology, 2021, Vol 121, Issue 9, p2449
- ISSN
1439-6319
- Publication type
Article
- DOI
10.1007/s00421-021-04714-4