Adolescent judo athletes that train in tropical climates may be in a persistent state of dehydration because they frequently restrict fluids during daily training sessions to maintain or reduce their body weight and are not given enough opportunities to drink.
Purpose: Determine the body hydration status of adolescent judo athletes before (PRE), immediately after (POST), and 24 hours after (24H) a training session and document sweat Na+ loss and symptoms of dehydration.
Methods: Body mass and urine color and specific gravity (USG) were measured PRE, POST, and 24H after a training session in a high heat stress environment (29.5 ± 1.0°C; 77.7 ± 6.1% RH) in 24 adolescent athletes. Sweat sodium loss was also determined. A comparison was made between mid pubertal (MP) and late pubertal (LP) subjects.
Results: The majority of the subjects started training with a significant level of dehydration. During the training session, MP subjects lost 1.3 ± 0.8% of their pre-training body mass while LP subjects lost 1.9 ± 0.5% (P < 0.05). Sweat sodium concentration was 44.5 ± 23.3 mmol/L. Fluid intake from a water fountain was minimal. Subjects reported symptoms of dehydration during the session which in some cases persisted throughout the night and the next day. The 24H USG was 1.028 ± 0.004 and 1.027 ± 0.005 g/ml for MP and LP, respectively.
Conclusions: Adolescent judo athletes arrive to practice with a fluid deficit, do not drink enough during training, and experience symptoms of dehydration which may compromise the quality of training and general well being.