Carbohydrate supplementation and psychophysiological responses during moderate exercise in hypoxia

Autor(es)

Tavares-Silva, E. ^[1] ; Donatto, F. F. ^[2] ; Medeiros, V, R. M. ; Santos, S. A. ^[2] ; Caris, V, A. ; Thomatieli-Santos, V, R.

Afiliação do(s) autor(es)

^[1] V, Univ Fed Sao Paulo, Dept Psychobiol, Sao Paulo - Brazil

^[2] V, Univ Fed Sao Paulo, Dept Biosci, Rua Silva Jardim, 136 Vila Mathias, BR-11015020 Santos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE INTERNATIONAL SOCIETY OF SPORTS NUTRITION; v. 17, n. 1 JAN 6 2020.
• Citações Web of Science: 1

Resumo

Background Rating of Perceived Exertion (RPE) is a subjective scale to monitor overload and fatigue during exercise. Hypoxia may worsen the perception of fatigue, compromising the self-reported perception of effort and increasing RPE. The objective was to evaluate the effects of carbohydrate (CHO) supplementation on RPE during exercise in hypoxia simulating 4200 m. Methods Eight male physically active volunteers performed two exercises at 50% VO2peak and 1% slope: exercise in hypoxia + placebo or exercise in hypoxia + CHO (6% maltodextrin) with supplementation at 20, 40, and 60 min during exercise. Oxygen Saturation (SaO(2)%) was assessed at baseline and after exercise, while RPE and HR were measured each 10 min during the trial. Results SaO(2)% decreased after exercise in both conditions of hypoxia compared to rest. The RPE did not differ between groups. However, the RPE increased in hypoxia after 20 min of exercise in relation to 10 min. The Area Under the Curve (AUC) of RPE was lower in hypoxia + CHO compared to hypoxia. The AUC of the HR/RPE ratio in the hypoxia + CHO group was higher in relation to hypoxia. Conclusions Our results indicate that CHO supplementation does not change RPE induced by 60 min of exercise at 50% VO2peak in hypoxia equivalent to 4200 m at the different times analyzed. However, in hypoxia + CHO the (AUC)-60 min of total RPE decreased during exercise, while the heart rate/RPE ratio improved, indicating lower RPE in the hypoxic environment. (AU)

• Processo FAPESP: 17/26563-2 - Efeitos da suplementação com carboidrato e glutamina sobre parâmetros da resposta immune inata e inflamação durante e após exercício na hipóxia
• Beneficiário: Ronaldo Vagner Thomatieli dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular