Effect of hypoxia and nitrate supplementation on different high-intensity interval-training sessions.
Eur J Appl Physiol
; 121(9): 2585-2594, 2021 Sep.
Article
em En
| MEDLINE
| ID: mdl-34097130
ABSTRACT
PURPOSE:
To test the hypothesis that interval-training (IHT) would be impaired by hypoxia to a larger extent than repeated-sprint training (RSH) and that dietary nitrate (NO3-) would mitigate the detrimental effect of hypoxia to a larger extent during IHT than RSH.METHODS:
Thirty endurance-trained male participants performed IHT (6 × 1 min at 90%∆ with 1 min active recovery) and RSH (2 sets of 6 × 10 s "all-out" efforts with 20 s active recovery) on a cycle ergometer, allocated in one of three groups normobaric hypoxia (~ 13% FiO2) + NO3- - HNO, n = 10; normobaric hypoxia + placebo - HPL, n = 10; normoxia (20.9% FiO2) + placebo - CON, n = 10. Submaximal oxygen uptake ([Formula see text]O2), time spent above 90% of maximal [Formula see text]O2 (≥ 90 [Formula see text]O2max) and heart rate (≥ 90 HRmax) were compared between IHT and RSH sessions and groups. Additionally, mean power output (MPO), decrement score and % of power associated with [Formula see text]O2max (%p[Formula see text]O2max) in RSH sessions were analyzed.RESULTS:
[Formula see text]O2 at sub-maximal intensities did not differ between training protocols and groups (~ 27 ml kg-1 min-1). ≥ 90 HRmax was significantly higher in IHT compared to RSH session (39 ± 8 vs. 30 ± 8%, p = 0.03) but only in HNO group. MPO (range 360-490 W) and decrement score (10-13%) were similar between groups although %p[Formula see text]O2max was significantly higher (p = 0.04) in CON (166 ± 16 W) compared with both HPL (147 ± 15 W) and HNO (144 ± 10 W) groups.CONCLUSION:
IHT responses were neither more impaired by hypoxia than RSH ones. Moreover, dietary NO3- supplementation impacted equally IHT and RSH training responses' differences between hypoxia and normoxia.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Suplementos Nutricionais
/
Treinamento Intervalado de Alta Intensidade
/
Hipóxia
/
Nitratos
Tipo de estudo:
Clinical_trials
Limite:
Adult
/
Humans
/
Male
Idioma:
En
Revista:
Eur J Appl Physiol
Assunto da revista:
FISIOLOGIA
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Portugal