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Dynamic exercise strongly affects atrial natriuretic peptides (ANP), in particular the mature bioactive αANP and the proANP fragments, namely proANP 1–98 , proANP 1–30  and proANP 31–67 . The proANPs influence kidney functions and their plasma levels increase after physical exercise. We measured urinary proANP 1–30  and proANP 31–67  levels before and at the end of physical exercise in 28 well-trained male cyclists. For the first time, the proANP 1–30  and proANP 31–67  urinary levels in athletes before and at the end of a prolonged agonistic bicycle race were measured. Urinary creatinine and total proteins were also measured. The urinary proANP 31–67 , creatinine and total protein levels were significantly higher at the end of exercise than before. In contrast, proANP 1–30 /protein and proANP 31–67 /protein ratios decreased after exercise. Even proANP 1–30 /creatinine and proANP 31–67 /creatinine ratios were lower after exercise. A significant correlation between proANP 1–30  and proANP 31–67  urinary levels at the end of exercise was found. The proANP 31–67 /creatinine ratio before and after exercise also showed a significant correlation. The variation of urinary proANP fragments confirmed their possible role in physical exercise. In particular, it could be interpreted as a response of the body or kidney to renal impairment occurring during exercise.

Effect of prolonged physical exercise on urinary proANP 1-30 and proANP 31-67