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• W2619130168 abstract "Amongst dietary strategies for performance enhancement a carbohydrate (CHO) mouth rinse is unique in that it may promote an increased rate of CHO oxidation without ingestion. Therefore, the possibility exists that a CHO mouth rinse may lead to a premature cessation of exercise due to a more rapid depletion of glycogen stores. PURPOSE: To calculate the time course of when CHO mouth rinsing may begin to be detrimental to performance. METHODS: Eight trained, competitive cyclists [age (mean ± SEM) = 24 ± 2 y; VO2max = 64.5 ± 2.8 ml/kg/min] completed three simulated 40-km time trials comprised of a familiarization trial, glucose mouth rinse trial (GLC), and placebo trial (PLA). A mouth rinse was administered prior to onset of exercise, and every 5-km throughout the time trial. CHO oxidation rates were calculated based on the equation: g/min = 4.210 VCO2 – 2.962 VO2 (Jeukendrup 2005) and then applied to previously established values of CHO stores in glycogen loaded individuals (Rapoport 2010) in order to estimate when stores would be exhausted. RESULTS: Time to completion was statistically faster (P<0.05) for GLC (67.1 ± 1.1 sec) compared to PLA (67.9 ± 1.0 sec). CHO oxidation rates were not statistically different (P=0.06) between the GLC (3.43 ± 0.80 g/min) and PLA (2.98 ± 0.18 g/min) groups. Assuming a 70 kg man is fully glycogen loaded at a wet weight of 200 mmol/kg muscle and that 22% of his body mass is leg muscle, glycogen stores would roughly equal 570 g in leg muscle. There was no statistical difference (P=0.06) between conditions in the time to deplete these stores. According to calculated oxidation rates, a 70-kg man would deplete leg stores in 175 ± 17 min when using a CHO mouth rinse and 196 ± 11 min when rinsing with a noncaloric sweetener. CONCLUSIONS: Rinsing the mouth with a CHO solution prior to and during exercise does not result in a more rapid depletion of muscle glycogen stores despite improved performance. However, when using a CHO rinse glycogen stores will be depleted in approximately 3 h and recommending this ergogenic approach for longer duration exercise should therefore be approached with caution." @default.
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• W2619130168 date "2017-05-01" @default.
• W2619130168 modified "2023-09-27" @default.
• W2619130168 title "The Repercussion of Expectoration" @default.
• W2619130168 doi "https://doi.org/10.1249/01.mss.0000518521.38166.d2" @default.
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