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Abstract
The influence of age on urinary excretion of arginine vasopressin (antidiuretic hormone) was examined in three groups of healthy men, 25±1 (n=12), 40 (n=44) and 50 years of age (n=28) respectively. Despite increasing plasma vasopressin with progressive age (2.5±0.6 vs. 3.5±0.4 vs. 7.4±1.0 ng/l, respectively) (means±SE), urinary excretion of vasopressin turned out similar (6.7± 1.0 vs. 6.8±0.8 vs. 6.9±0.6 ng/h). No differences in sodium excretion, serum osmolality and creatinine clearance appeared that could explain these findings. The present results suggest that age-related impairment of renal concentrating capacity is compensated for by increasing circulating plasma vasopressin. Furthermore, differences in tubular handling of the hormone with age may explain the present findings, and may be another compensatory mechanism for decreased urinary concentrating ability.