Lactose as an Alternative Carbohydrate in Sports Food Within Male Athletes.

This study will include 7 visits to the laboratory per participant including: 1. Familiarisation trial of the performance test, and measurements of VO2 max and Wmax. The familiarisation trial is anticipated to take approximately 2.5 hours. The VO2 max test will be conducted only on stationary bikes through gas sampling and converted to VO2 through the Moxus software. 2. On a weekly basis (or longer to 4 weeks depending on participant availability schedule) - three steady state rides for 2 hours at 57.5% Wmax to establish background metabolism of 13C. These background visits will also take approximately 2.5 hours. 3. On a weekly basis and two days after each of the background tests - three experimental trials consisting of a 2 hour ride at 57.5% Wmax and a performance test including 10 x 2 minute maximal sprint efforts. These experimental trial visits will take approximately 3 hours to complete, and the washout period between each experimental trial is at least 7 days for each participant. During the experimental trials, carbohydrate drinks containing different carbohydrate mixtures will be provided at 15 minute intervals. The drinks will be 200 ml per serve and also all contain lime juice (16 g/L), citric acid (1.0 g/L) and NaCl (20mmol/L). To monitor adherence, each cyclist will have an individual researcher responsible for supplying the drinks and ensuring that the full dose is completed and on time.