It is studied in experiment on nonstrain white rats the influence of different photoperiod duration on monthly chronorhythms of excretory, ionregulating, acid-excretory kidney function in conditions of inducted water diuresis. It was prooved, that after animals seven days stay in conditions of constant light, monthly chronorhythms parameters of excretory, ionregulating, acid-excretory kidney function were essentialy changed with formed desynchronosis. Main compensatory and decompensatory chronorhythms changes, which can be used as diagnostical criteria of kidney function disordes in case of organism long stay in changed photoperiod condition, were defined.
