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This study was designed to investigate the properties of the three typical kendo practices (kirikaeshi, kakarigeiko, and jigeiko) in terms of changes in urine flow and creatinine excretion after practice events. The subjects were six male university kendo practitioners. They performed four exercises that were three kendo practices and a warming up without a kendo practice as the control, at a separate day respectively. In each exercise, five urine samples were collected continuously as follows: (1) after 30 minutes rest (rest), (2) immediately after warming up (w-up), (3•`5) at every 30 minutes after practice event up to 90 minutes (30'-•`90'-urine) . Two blood samples were collected at the rest period and 5 10 minutes after exercise. The blood lactate concentration after kendo practices rose to 1.09-8.02 times of rest level. The 30'-urine flow tended to decrease than w-up in kirikaeshi, jigeiko and control, but to increase in kakarigeiko. Creatinine concentration of 30'-urine rose significantly in the control, kirikaeshi and jigeiko than w-up, but significantly fell in kakarigeiko. The kakarigeiko brought peculiar changes in 30'-urine. The urinary changes after exercises (30'-urine rest) indicated nonlinear relation with blood lactate change ratios. These results indicate that the kendo practices bring the two-way influences in urinary change, one is diuretic effect accompanied with lactate accumulation in the kakarigeiko, and the other is the antidiuretic effect accompanied with less lactate accumulation in the kirikaeshi and jigeiko. (Jpn. J. Phys. Fitness Sports Med. 2003, 52: 131140) key word: kendo, physiological properties, urine flow, creatinine

PHYSIOLOGICAL PROPERTIES OF KENDO PRACTICES IN TERMS OF URINE AND CREATININE EXCRETION CHANGES