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To examine the impact of making weight on aerobic work capacity and cognitive processes in a group of professional jockeys.

Nine male jockeys and 9 age-, gender-, and BMI-matched controls were recruited to take part in two experimental trials, conducted 48 hr apart. The jockeys were asked to reduce their body mass by 4% in the 48 hr between trials, and controls maintained usual dietary and physical activity habits between trials. Aerobic work capacity was assessed by performance during an incremental cycle ergometer test. Motor response, decision making, executive function, and working memory were assessed using a computerized cognitive test battery.

The jockey group significantly reduced their body mass by 3.6 ± 0.9% ( p < .01). Mean urine specific gravity (Usg) readings increased from 1 …