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Carbohydrate supplementation and psychophysiological responses during moderate exercise in hypoxia.

ABSTRACT: 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 (SaO2%) was assessed at baseline and after exercise, while RPE and HR were measured each 10?min during the trial. RESULTS:SaO2% 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.

SUBMITTER: Tavares-Silva E

PROVIDER: S-EPMC6945642 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Carbohydrate supplementation and psychophysiological responses during moderate exercise in hypoxia.

Tavares-Silva E E Donatto F F FF Medeiros R M V RMV Santos S A SA Caris A V AV Thomatieli-Santos R V RV

Journal of the International Society of Sports Nutrition 20200106 1

<h4>Background</h4>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.<h4>Methods</h4>Eight male physically active volunteers performed two exercises at 50% VO<sub>2peak</sub> and 1% slope: exerc ...[more]

PMID: 31906976

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Project description:Purpose: Nitric oxide (NO) bioavailability is reduced during acute altitude exposure, contributing toward the decline in physiological and cognitive function in this environment. This study evaluated the effects of nitrate ([Formula: see text]) supplementation on NO bioavailability, physiological and cognitive function, and exercise performance at moderate and very-high simulated altitude. Methods:Ten males (mean (SD): [Formula: see text]: 60.9 (10.1) ml·kg-1·min-1) rested and performed exercise twice at moderate (~14.0% O2; ~3,000 m) and twice at very-high (~11.7% O2; ~4,300 m) simulated altitude. Participants ingested either 140 ml concentrated [Formula: see text]-rich (BRJ; ~12.5 mmol [Formula: see text]) or [Formula: see text]-deplete (PLA; 0.01 mmol [Formula: see text]) beetroot juice 2 h before each trial. Participants rested for 45 min in normobaric hypoxia prior to completing an exercise task. Exercise comprised a 45 min walk at 30% [Formula: see text] and a 3 km time-trial (TT), both conducted on a treadmill at a 10% gradient whilst carrying a 10 kg backpack to simulate altitude hiking. Plasma nitrite concentration ([[Formula: see text]]), peripheral oxygen saturation (SpO2), pulmonary oxygen uptake ([Formula: see text]), muscle and cerebral oxygenation, and cognitive function were measured throughout. Results: Pre-exercise plasma [[Formula: see text]] was significantly elevated in BRJ compared with PLA (p = 0.001). Pulmonary [Formula: see text] was reduced (p = 0.020), and SpO2 was elevated (p = 0.005) during steady-state exercise in BRJ compared with PLA, with similar effects at both altitudes. BRJ supplementation enhanced 3 km TT performance relative to PLA by 3.8% [1,653.9 (261.3) vs. 1718.7 (213.0) s] and 4.2% [1,809.8 (262.0) vs. 1,889.1 (203.9) s] at 3,000 and 4,300 m, respectively (p = 0.019). Oxygenation of the gastrocnemius was elevated during the TT consequent to BRJ (p = 0.011). The number of false alarms during the Rapid Visual Information Processing Task tended to be lower with BRJ compared with PLA prior to altitude exposure (p = 0.056). Performance in all other cognitive tasks did not differ significantly between BRJ and PLA at any measurement point (p ≥ 0.141). Conclusion: This study suggests that BRJ improves physiological function and exercise performance, but not cognitive function, at simulated moderate and very-high altitude.

Dataset Information

Carbohydrate supplementation and psychophysiological responses during moderate exercise in hypoxia.

Publications

Carbohydrate supplementation and psychophysiological responses during moderate exercise in hypoxia.

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