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Perception of carbohydrate availability augments high-intensity intermittent exercise capacity under sleep-low train low conditions

Waterworth, Sally and Spencer, Connor C and Porter, Aaron L and Morton, James P (2020) 'Perception of carbohydrate availability augments high-intensity intermittent exercise capacity under sleep-low train low conditions.' International Journal of Sport Nutrition and Exercise Metabolism, 30 (2). pp. 105-111. ISSN 1526-484X

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The authors tested the hypothesis that perception of carbohydrate (CHO) availability augments exercise capacity in conditions of reduced CHO availability. Nine males completed a sleep-low train model comprising evening glycogen-depleting cycling followed by an exhaustive cycling protocol the next morning in the fasted state (30 min steady state at 95% lactate threshold followed by 1-min intervals at 80% peak power output until exhaustion). After the evening depletion protocol and prior to sleeping, subjects consumed (a) a known CHO intake of 6 g/kg body mass (TRAIN HIGH) or (b) a perceived comparable CHO intake but 0 g/kg body mass (PERCEPTION) or a known train-low condition of 0 g/kg body mass (TRAIN LOW). The TRAIN HIGH and PERCEPTION trials were conducted double blind. During steady state, average blood glucose and CHO oxidation were significantly higher in TRAIN HIGH (4.01 ± 0.56 mmol/L; 2.17 ± 0.70 g/min) versus both PERCEPTION (3.30 ± 0.57 mmol/L; 1.69 ± 0.64 g/min, <jats:italic>p</jats:italic> &lt; .05) and TRAIN LOW (3.41 ± 0.74 mmol/L; 1.61 ± 0.59 g/min, <jats:italic>p</jats:italic> &lt; .05). Exercise capacity was significantly different between all pairwise comparisons (<jats:italic>p</jats:italic> &lt; .05), where TRAIN LOW (8 ± 8 min) &lt; PERCEPTION (12 ± 6 min) &lt; TRAIN HIGH (22 ± 9 min). Data demonstrate that perception of CHO availability augments high-intensity intermittent exercise capacity under sleep-low, train-low conditions, though this perception does not restore exercise capacity to that of CHO consumption. Such data have methodological implications for future research designs and may also have practical applications for athletes who deliberately practice elements of training in CHO-restricted states.

Item Type: Article
Uncontrolled Keywords: placebo; glycogen; CHO restriction; fatigue
Divisions: Faculty of Science and Health
Faculty of Science and Health > Sport, Rehabilitation and Exercise Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 07 Feb 2020 16:03
Last Modified: 27 Oct 2022 11:19

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