The influence of air-cushion shoes on post-exercise proteinuria

Fourteen trained males participated in three sets of progressive 1 min exercise till exhaustion comparing proteinuria after bicycling, treadmill running under barefoot and air-cushion shoe conditions. Venous lactate rose to about 11 moles.l-1 after the three bouts of exercise while total protein and albumin urinary excretion increased 7 (rest micrograms.min-1) and 19 (rest 11 micrograms.min-1) fold respectively. Creatinine clearance declined to 75% (88 ml.min-1) of the resting values for all three exercises. Albumin clearances increased from 0.24 microliter.min-1 at rest to 4.08 microliters.min-1 during the recovery period. None of the above values were statistically different while comparing the three protocols. On the contrary, plasma hemoglobin showed a significant rise with bare-footed-running (rest 10 mg.100 ml-1; exercise 21 mg.100 ml-1). The lack of hemoglobin in urine postulated that the renal threshold for excretion was not attained in the present conditions. The results indicate that haemolysis and repeated shocks on the foot sole do not lead to the urinary excretion of proteins induced by short-term progressive and exhaustive exercise in humans.