Effect of protein-rich feeding on recovery after intense exercise.
Carbohydrate ingestion after prolonged strenuous exercise enhances recovery, but protein might also be important. In a crossover with 2-wk washout, 10 cyclists completed 2.5 h of intervals followed by 4-h recovery feeding, provided 218 g protein, 435 g carbohydrate, and 79 g fat (protein enriched) or 34 g protein, 640 g carbohydrate, and 79 g fat (isocaloric control). The next morning, cyclists performed 10 maximal constant-work sprints on a Velotron cycle ergometer, each lasting approximately 2.5 min, at approximately 5-min intervals. Test validity was established and test reliability and the individual response to the protein-enriched condition estimated by 6 cyclists'repeating the intervals, recovery feeding, and performance test 2 wk later in the protein-enriched condition. During the 4-h recovery, the protein-enriched feeding had unclear effects on mean concentrations of plasma insulin, cortisol, and growth hormone, but testosterone was 25% higher (90% confidence limits, +/- 14%). Protein enrichment also reduced plasma creatine kinase by 33% (+/-38%) the next morning and reduced tiredness and leg-soreness sensations during the sprints, but effects on mean sprint power were unclear (-1.4%, +/-4.3%). The between-subjects trial-to-trial coefficient of variation in overall mean sprint power was 3.1% (+/-3.4%), whereas the variation in the protein-enriched condition was 5.9% (+/-6.9%), suggesting that individual responses to the protein-enriched treatment contributed to the unclear performance outcome. To conclude, protein-enriched recovery feeding had no clear effect on next-day performance.
D000328:Adult; D001642:Bicycling; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000008:administration & dosage; D004044:Dietary Proteins / Q000008:administration & dosage*; D004305:Dose-Response Relationship, Drug; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000293:injuries / Q000502:physiology; D010807:Physical Endurance; D005082:Physical Exertion; D013647:Task Performance and Analysis
D004040:Dietary Carbohydrates; D004044:Dietary Proteins