Changes in the concentrations of urinary proteins after physical exercise

Area of Science:

• Nephrology
• Sports Medicine
• Biochemistry

Background:

• Urinary protein excretion can be influenced by physiological stressors like exercise.
• Understanding kidney function markers in athletes is crucial for monitoring health and performance.

Purpose of the Study:

• To investigate the impact of acute physical exercise on urinary protein markers in adolescent male athletes.
• To assess changes in total protein, albumin, beta 2-microglobulin, creatinine, and N-acetyl-beta-D-glucosaminidase activity post-exercise.

Main Methods:

• Urine samples collected from 17 male high school baseball players before and after exercise.
• Analysis of total protein, albumin, beta 2-microglobulin, and creatinine concentrations.
• Measurement of N-acetyl-beta-D-glucosaminidase activity and isoenzyme analysis.

Main Results:

• Significant increases (p < 0.01) observed in urinary concentrations of total protein, albumin, beta 2-microglobulin, and creatinine post-exercise.
• No significant increase in N-acetyl-beta-D-glucosaminidase activity after exercise.
• Positive correlations found between protein markers and creatinine, but not with enzyme activity.

Conclusions:

• Acute exercise leads to transient increases in urinary protein and albumin excretion in young athletes.
• Kidney tubular function, indicated by N-acetyl-beta-D-glucosaminidase, appears unaffected by this level of physical exertion.
• Urinary creatinine serves as a reliable marker for adjusting protein excretion measurements.