Abstract

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 VO_2max 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 TT₄₀ 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 (% VO_2max), 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.