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- W2183205087 abstract "Abstract The purposes of this study were: 1) to obtain a measure of exogenous carbohydrate (CHO EXO )oxidation and plasma glucose kinetics during five hours of exercise, 2) to compare CHO EXO following the ingestion of a glucose solution (GLU) or a glucose + fructose solution (2:1 ratio, GLU+FRU) during ultra-endurance exercise. Eight well-trained subjects exercised 3 times for 5 h at 58 % VO 2 max whilst ingesting either GLU or GLU+FRU (both delivering 1.5 g/min carbohydrate) or water. The carbohydrates used had a naturally high 13 C enrichment and 5 subjects received a primed continuous intravenous [6,6 2 H 2 ] glucose infusion. CHO EXO rates following the ingestion of GLU levelled off after 120 min and peaked at 1.24 ± 0.04 g/min. The ingestion of GLU+FRU resulted in a significantly higher peak rate of CHO EXO (1.40 ± 0.08 g/min), a faster rate of increase in CHO EXO and an increase in the percentage of CHO EXO oxidised (65 to 77 %). However, Ra and Rd glucose continued to increase during exercise with no differences between trials. These data suggest an important role for gluconeogenesis during the later stages of exercise. Following the ingestion of GLU+FRU, cadence (rpm) was maintained, the perception of stomach fullness was reduced relative to GLU. The ingestion of GLU+FRU increases CHO" @default.
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- W2183205087 date "2005-01-01" @default.
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- W2183205087 title "Exogenous carbohydrate oxidation during ultra-endurance exercise Running Title: Substrate oxidation during ultra-endurance cycling" @default.
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