The influence of bovine colostrum supplementation on exercise performance in highly trained cyclists
Shing, CM and Jenkins, DG and Stevenson, L and Coombes, JS, The influence of bovine colostrum supplementation on exercise performance in highly trained cyclists, British Journal of Sports Medicine, 40, (9) pp. 797-801. ISSN 0306-3674 (2006) [Refereed Article]
Purpose: The aim of this experiment was to investigate the influence of low dose bovine colostrum supplementation on exercise performance in cyclists over a 10 week period that included 5 days of high intensity training (HIT). Methods: Over 7 days of preliminary testing, 29 highly trained male road cyclists completed a VO2max test (in which their ventilatory threshold was estimated), a time to fatigue test at 110% of ventilatory threshold, and a 40 km time trial (TT40). Cyclists were then assigned to either a supplement (n = 14, 10 g/day bovine colostrum protein concentrate (CPC)) or a placebo group (n = 15, 10 g/day whey protein) and resumed their normal training. Following 5 weeks of supplementation, the cyclists returned to the laboratory to complete a second series of performance testing (week 7). They then underwent five consecutive days of HIT (week 8) followed by a further series of performance tests (week 9). Results: The influence of bovine CPC on TT 40 performance during normal training was unclear (week 7: 1+3.1%, week 9: 0.1 ± 2.1%; mean ± 90% confidence limits). However, at the end of the HIT period, bovine CPC supplementation, compared to the placebo, elicited a 1.9 + 2.2% improvement from baseline in TT40 performance and a 2.3 + 6.0% increase in time trial intensity (% VO2max), and maintained TT40 heart rate (2.5 ± 3.7%). In addition, bovine CPC supplementation prevented a decrease in ventilatory threshold following the HIT period (4.6 + 4.6%). Conclusion: Low dose bovine CPC supplementation elicited improvements in TT40 performance during an HIT period and maintained ventilatory threshold following five consecutive days of HIT.