Postexercise proteinuria in childhood and adolescence

Area of Science:

• Pediatric Exercise Physiology
• Renal Physiology in Youth
• Sports Medicine

Background:

• Postexercise proteinuria is documented in adults, but data in young individuals are limited.
• Understanding kidney response to exercise in children is crucial for health and performance.
• Previous research has not fully elucidated age and intensity-dependent changes in young athletes.

Purpose of the Study:

• To investigate postexercise proteinuria in healthy children and adolescents aged 6–18 years.
• To determine the relationship between exercise intensity, age, gender, and protein excretion.
• To assess changes in glomerular and tubular function following maximal exercise in youth.

Main Methods:

• 170 healthy boys and girls (6–18 years) performed a 20-meter shuttle run test to maximal capacity.
• Urine samples were collected before and 30 minutes after exercise.
• Excretion rates of total protein, albumin, beta 2-microglobulin, retinol-binding protein, and creatinine were measured.

Main Results:

• Resting protein excretion was within normal ranges, with a progressive increase in total protein and albumin with age.
• Postexercise protein excretion increased with exercise intensity and age.
• A gender difference was observed between 6–9 years, with boys showing increased macromolecule excretion.
• High- and low-molecular weight protein excretion indicated increasing renal disturbances from age 9 to 18 in both genders.

Conclusions:

• Postexercise proteinuria occurs in children and adolescents during maximal exercise.
• The magnitude of protein excretion is directly related to exercise intensity.
• Glomerular and tubular reabsorption processes differ between pre- and postpubertal individuals, influenced by exercise.