Prescribed Drinking Leads to Better Cycling Performance than Ad Libitum Drinking.

Drinking ad libitum during exercise often leads to dehydration ranging from -1 to -3% of body weight. Purpose: To study the effect of a prescribed hydration protocol matching fluid losses on a simulated 30-km criterium-like cycling performance in the heat (31.6+/-0.5 [degrees]C). Method: Ten elite, heat-acclimatized, male endurance cyclists (30+/-5 y, 76.5+/-7.2 kg, 1.81+/-0.07 m, VO2peak: 61.3+/-5.2 ml[BULLET OPERATOR]min-1[BULLET OPERATOR]kg-1, body fat: 10.5+/-3.3%, Powermax: 392+/-33 W) performed three sets of criterium-like cycling, consisted of a 5-km at 50% power max, followed by a 5-km all out at 3% grade (total 30 km). Participants rode the course on two separate occasions and in a counter balanced order, either during ad libitum drinking (AD: drink water as much as they wished) and prescribed drinking (PD: drink water every 1 km to much fluid losses). To design the fluid intake during PD participants performed a familiarization trial to calculate fluid losses. Results: Following the exercise protocol the cyclist dehydrated by -0.5+/-0.3 and -1.8+/-0.7% of their body weight for the PD and AD trial, respectively. Mean cycling speed for the 3rd bout of the 5 km hill cycling was greater in PD (30.2+/-2.4 km[BULLET OPERATOR]h-1) than in the AD trial (28.8+/-2.6 km[BULLET OPERATOR]h-1), by 5.1+/-4.8% (P

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