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Dietary regimen and performance of high intensity ergometer exercise
J A White1, S Harridge, D Stensil
1Department of Human and Environmental Sciences, West London Institute of Higher Education, Isleworth, Middlesex.
British Journal of Sports Medicine
|September 1, 1988
Summary
Dietary manipulation significantly improves high-intensity cycling performance. A carbohydrate-rich diet (CD) maximized exercise time to exhaustion, outperforming a protein-rich diet (PD).
Area of Science:
- Sports Science
- Human Physiology
- Nutritional Science
Background:
- Pre-exercise nutrition significantly impacts endurance performance.
- Understanding optimal dietary strategies for high-intensity, short-duration cycling is crucial for athletes.
Purpose of the Study:
- To investigate the effects of three distinct dietary regimens—mixed diet (MD), carbohydrate diet (CD), and protein diet (PD)—on exercise performance in middle-distance runners.
- To determine how preceding diet influences cardiorespiratory, metabolic responses, and time to exhaustion during high-intensity cycling.
Main Methods:
- Six middle-distance runners completed cycle ergometer tests at 80% VO2 max until exhaustion.
- Subjects followed MD, CD, or PD regimens prior to exercise.
- Dietary intake was analyzed, and cardiorespiratory measures, blood glucose, lactate, and time to exhaustion were recorded.
Main Results:
- Carbohydrate intake showed a significant positive correlation with exercise time to exhaustion (r=0.59, P<0.05).
- Time to exhaustion was significantly longer following CD (1070.0 ± 106.7 s) compared to PD (642.5 ± 84.3 s, P<0.01).
- Peak blood lactate was lower after PD (P<0.05), but no significant differences were found in cardiorespiratory or blood glucose responses.
Conclusions:
- Dietary manipulation, particularly a carbohydrate-rich diet, can significantly enhance exercise capacity during short-term, high-intensity cycling.
- While PD reduced peak lactate, CD provided the greatest performance benefit in terms of time to exhaustion.
- These findings highlight the importance of strategic pre-exercise nutrition for optimizing athletic performance in specific intensity and duration contexts.