Effect of 4h Preexercise High Carbohydrate and High Fat Meal Ingestion on Endurance Performance and Metabolism

Oct 1, 1996International journal of sports medicine

How eating a high-carb or high-fat meal 4 hours before exercise may affect endurance and metabolism

AI simplified

Circadian Biology on OpenScience ↗PubMed ↗DOI ↗

Abstract

Endurance capacity did not differ significantly between a high carbohydrate meal and a high fat meal 4 hours before exercise, with times of 128 ± 3 min and 122 ± 3 min, respectively.

Serum insulin levels were significantly higher at the start of exercise after the high carbohydrate meal compared to the high fat meal.
Blood glucose levels did not differ significantly between the high carbohydrate and high fat meal trials.
During the first 40 minutes of exercise, the respiratory exchange ratio was significantly higher following the high carbohydrate meal.
Levels of serum free fatty acids and beta-hydroxybutyrate were significantly lower after the high carbohydrate meal.
Heart rate, oxygen consumption, and perceived exertion were similar between both meal regimens during exercise.

AI simplified

The effect of a single high carbohydrate meal (HCM) and high fat meal (HFM) given 4 h before cycling exercises was determined for performance and metabolism. On the morning of the day of the trial, 10 endurance-trained collegiate males consumed either a single HCM (4669 kj; 79% CHO, 10% F and 11% P) or HFM (4711 kj; 30% CHO, 61% F and 9% P) as a 4 h preexercise meal. The intensity of exercise required was 65% of the maximal oxygen consumption (VO2max) for the first 120 min of exercise, followed by an increased dose of 80% VO2max. Endurance capacity did not differ between the HCM (128 +/- 3 min [SEM]) and HFM (122 +/- 3 min) trials. There was no significant difference in blood glucose levels in the HCM and HFM trials. A significantly higher (p < 0.01) serum insulin level in the HCM trials over the HFM trials was only observed at the start of exercise. Blood lactate levels (< 2.6 mM) during cycling remained below the anaerobic threshold. Respiratory exchange ratio in the HCM trials was significantly higher (p < 0.05 or p < 0.01) than that in HFM trials during the first 40 min of exercise. This was accompanied by significantly lower (p < 0.05 or p < 0.01) levels in serum free fatty acid and beta-HOB for the HCM trial. There was no significant difference between both diet regimens as to heart rate, oxygen consumption and perceived exertion during exercise. These results suggest that a single HCM and HFM given 4 h before exercise influences fuel utilization in the initial stages of prolonged cycling, but these meals may have little effect on endurance capacity.

Full Text

Full text is available at the source.

View full text ↗

Effect of 4h Preexercise High Carbohydrate and High Fat Meal Ingestion on Endurance Performance and Metabolism

Abstract

Full Text

You found one interesting study. We’ll send the next 7.

what lands in your inbox each week:

Recent issues from the circadian biology brief

Abstract

Full Text

Related papers

You found one interesting study. We’ll send the next 7.

what lands in your inbox each week:

Recent issues from the circadian biology brief