Glucose‐fructose likely improves gastrointestinal comfort and endurance running performance relative to glucose‐only

Jan 6, 2015Scandinavian journal of medicine & science in sports

Glucose-fructose may improve stomach comfort and endurance running compared to glucose alone

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Abstract

Participants completed a 4-mile time trial 1.9% faster after consuming glucose-fructose beverages compared to glucose-only beverages.

Glucose-fructose ingestion may enhance performance during prolonged running.
GI symptoms were possibly-to-likely lower with glucose-fructose compared to glucose-only.
Psychological affect ratings were possibly higher with glucose-fructose ingestion.
Fat oxidation during submaximal running was possibly higher with glucose-fructose.
No clear differences in blood lactate levels were observed between conditions.

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This study aimed to determine whether glucose-fructose (GF) ingestion, relative to glucose-only, would alter performance, metabolism, gastrointestinal (GI) symptoms, and psychological affect during prolonged running. On two occasions, 20 runners (14 men) completed a 120-min submaximal run followed by a 4-mile time trial (TT). Participants consumed glucose-only (G) or GF (1.2:1 ratio) beverages, which supplied ∼ 1.3 g/min of carbohydrate. Substrate use, blood lactate, psychological affect [Feeling Scale (FS)], and GI distress were measured. Differences between conditions were assessed using magnitude-based inferential statistics. Participants completed the TT 1.9% (-1.9; -4.2, 0.4) faster with GF, representing a likely benefit. FS ratings were possibly higher and GI symptoms were possibly-to-likely lower with GF during the submaximal period and TT. Effect sizes for GI distress and FS ratings were relatively small (Cohen's d = ∼0.2 to 0.4). GF resulted in possibly higher fat oxidation during the submaximal period. No clear differences in lactate were observed. In conclusion, GF ingestion - compared with glucose-only - likely improves TT performance after 2 h of submaximal running, and GI distress and psychological affect are likely mechanisms. These results apply to runners consuming fluid at 500-600 mL/h and carbohydrate at 1.0-1.3 g/min during running at 60-70% VO2peak .

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Glucose‐fructose likely improves gastrointestinal comfort and endurance running performance relative to glucose‐only

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