The impact of work-matched interval training on VÌO2peak and VÌO2 kinetics: diminishing returns with increasing intensity.
Appl Physiol Nutr Metab
; 41(7): 706-13, 2016 Jul.
Article
em En
| MEDLINE
| ID: mdl-27337599
ABSTRACT
High-intensity interval training (HIIT) improves peak oxygen uptake (VÌO2peak) and oxygen uptake (VÌO2) kinetics, however, it is unknown whether an optimal intensity of HIIT exists for eliciting improvements in these measures of whole-body oxidative metabolism. The purpose of this study was to (i) investigate the effect of interval intensity on training-induced adaptations in VÌO2peak and VÌO2 kinetics, and (ii) examine the impact of interval intensity on the frequency of nonresponders in VÌO2peak. Thirty-six healthy men and women completed 3 weeks of cycle ergometer HIIT, consisting of intervals targeting 80% (LO), 115% (MID), or 150% (HI) of peak aerobic power. Total work performed per training session was matched across groups. A main effect of training (p < 0.05) and a significant interaction effect was observed for VÌO2peak, with the change in VÌO2peak being greater (p < 0.05) in the MID group than the LO group; however, no differences were observed between the HI group and either the MID or LO groups (ΔVÌO2peak; LO, 2.7 ± 0.7 mL·kg(-1)·min(-1); MID, 5.8 ± 0.7; HI, 4.2 ± 1.0). The greatest proportion of responders was observed in the MID group (LO, 8/12; MID, 12/13; HI, 9/11). A nonsignificant relationship (p = 0.26; r(2) = 0.04) was found between the changes in VÌO2peak and τVÌO2. These results suggest that training at intensities around VÌO2peak may represent a threshold intensity above which further increases in training intensity provide no additional adaptive benefit. The dissociation between changes in VÌO2peak and VÌO2 kinetics also reflects the different underlying mechanisms regulating these adaptations.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Consumo de Oxigênio
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Resistência Física
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Exercício Físico
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Treinamento Intervalado de Alta Intensidade
Limite:
Adolescent
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Adult
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Female
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Humans
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Male
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article