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Related Experiment Videos

Renal osmol clearance during prolonged heavy exercise.

H E Refsum, S B Strømme

    Scandinavian Journal of Clinical and Laboratory Investigation
    |February 1, 1978
    PubMed
    Summary

    During prolonged exercise, athletes experience dehydration, leading to reduced urine flow and decreased kidney concentrating ability. This study in cross-country skiers confirms that heavy exertion impairs the kidneys' capacity to concentrate urine.

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    Area of Science:

    • Exercise Physiology
    • Renal Physiology
    • Sports Medicine

    Background:

    • Prolonged strenuous exercise can lead to dehydration and impact kidney function.
    • Understanding renal responses during endurance events is crucial for athlete health and performance.
    • Previous research suggested a decline in urine concentrating ability during heavy exercise.

    Purpose of the Study:

    • To investigate the effect of prolonged, heavy exercise on urine concentrating ability.
    • To examine the relationship between urine flow, glomerular filtration rate, and urine osmolality.
    • To confirm findings on renal function during endurance events.

    Main Methods:

    • Measured serum and urine osmolality and creatinine in 58 male cross-country skiers.
    • Collected samples in relation to three 70 km races under similar environmental conditions.
    • Analyzed urine flow rate and creatinine clearance.

    Main Results:

    • Despite low urine flow (0.51 ml/min), urine osmolality and urine to serum osmolality ratio were relatively low (860 mosm/kg H2O and 2.84, respectively).
    • Decreased urine flow and creatinine clearance correlated with a lower urine to serum osmolality ratio.
    • This indicates a reduced urine concentrating ability during prolonged exercise.

    Conclusions:

    • Prolonged heavy exercise, even with slight dehydration, impairs the kidneys' ability to concentrate urine.
    • Reduced urine flow and glomerular filtration rate accompany a decline in urine concentrating capacity.
    • The findings support the hypothesis that strenuous endurance activity negatively affects renal concentrating function.

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