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- W2618858315 abstract "Ergogenic benefits of carbohydrate (CHO) supplementation during exercise at high altitude (HA) appear to vary depending on acclimatization status. However, longitudinal evaluation of potential performance benefits of CHO in the same volunteers, prior to- and following acclimatization to HA have not been reported. PURPOSE: To determine the impact of a CHO beverage consumed during steady-state exercise, on subsequent time trial (TT) performance (2 mi. run), of lowlanders immediately after they arrived at high altitude (A-HA) and after 22 days (C-HA) of acclimatization at 4,300 m. METHODS: Seventeen unacclimatized men (mean ± SD; age, 23.4 ± 5.6 y; body mass, 81.9 ± 13.9 kg; SL VO2peak 4.2 ± 0.7 L/min, HA VO2peak 2.8 ± 0.5 L/min) performed 80-min of treadmill walking (~55% of HA VO2peak) at sea level (SL), A-HA and C-HA. Before, and every 20 min during exercise they consumed either a CHO beverage (n = 9; 45 g fructose/L + 55 g glucose/L, 1.8 g CHO/min) or a flavor-matched placebo (PLA, n = 8). Immediately following walking/supplementation, a 2 mi., self-paced TT was performed. RESULTS: There were no differences (P>0.05) in TT duration between CHO and PLA at SL (17.1 ± 2.8 vs. 18.8 ± 4.2 min), A-HA (27.9 ± 5.0 vs. 27.3 ± 7.0 min) or C-HA (23.9 ± 4.0 vs. 24.2 ± 4.7 min), respectively. Acute and chronic HA exposure did significantly alter TT performance such that A-HA duration > SL and C-HA, and C-HA duration was > SL (P<0.05). There were also no differences (P>0.05) at SL, A-HA and C-HA between CHO and PLA in exercise intensity (% SL VO2peak) and pacing at 0.5 mi. increments during the TTs. ONCLUSIONS: CHO supplementation did not provide any benefit to TT performance when volunteers were unacclimatized or acclimatized to HA. Chronic HA exposure/acclimatization did improve performance compared to that after acute HA exposure, but performance remained worse than at SL. Authors’ views not official U.S. Army or DoD policy." @default.
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- W2618858315 date "2017-05-01" @default.
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- W2618858315 title "No Impact of Carbohydrate Supplementation and Altitude Acclimatization on Aerobic Exercise Performance" @default.
- W2618858315 doi "https://doi.org/10.1249/01.mss.0000519287.94638.b7" @default.
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