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- W2035537031 abstract "Previous research has demonstrated conflicting results regarding a gender difference in substrate utilization during exercise. PURPOSE: This study evaluated the effects of CHO supplementation on whole body and muscle substrate utilization during prolonged, discontinuous exercise in men and women. METHODOLOGY: Thirteen recreationally trained subjects (n=7 males, n=6 females, during the follicular phase) performed a GXT on a treadmill (TM) and electronically braked cycle ergometer to determine ventilatory threshold (VT) and VO2peak. In a double blind, random crossover design, subjects received either a CHO [20% maltodextrin (0.6g/kg FFM/hr)] or flavored placebo (PLA) drink each hour. TM exercise was performed at 44±4% VO2peak, and 71±3% VT. Cycle ergometer exercise was performed at 42±1% VO2peak, and 72±4% VT. Hourly exercise included 9 minutes on an upper body ergometer, 19 minutes on the cycle ergometer, and 20 minutes on the treadmill, followed by a 10-minute rest and feeding period. A standardized breakfast and lunch (5 g/kg BW CHO, and 1.2 g/kg BW PRO) were provided for both trials. Muscle biopsies of the vastus lateralis were performed pre- and post-exercise, and expired gases were collected every other hour during the TM segment of the trial. Blood glucose (BG) was measured continuously using an indwelling glucose sensor, and total urine void was collected. RESULTS: Using a three-way ANOVA (gender*trial*time) there was no significant interaction in whole body and muscle substrate utilization. A main effect was seen for time in CHO oxidation (137.8±13, 129.9±18 and 108.0±17, 86.2±18 umol/kg FFM/min for CHO and PLA respectively, p=0.0001), fat oxidation (4.5±1, 5.3±2 and 7.1±2, 9.0±2 umol/kg FFM/min for CHO and PLA respectively, p=0.0001), and blood glucose (133.3±27, 108.29±28 and 128.8±31, 99.9±25 mg/dL for CHO and PLA respectively, p=0.0001). A main effect was also demonstrated for trial in muscle glyc ogeno lysis rate (3.4±2 and 6.1±2 mmol/kg wet wt/hr for CHO and PLA respectively, p=0.0064). CONCLUSION: Ingestion of CHO during long duration, low intensity exercise appears to have no gender specific effect on whole body substrate utilization. Although CHO ingestion decreases muscle glycogenolysis there is no gender specific effect. Supported by The Gatorade Sport Science Institute." @default.
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- W2035537031 date "2006-05-01" @default.
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- W2035537031 title "Effects of Carbohydrate Supplementation In Men and Women During Long Duration Exercise" @default.
- W2035537031 doi "https://doi.org/10.1249/00005768-200605001-01731" @default.
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