Abstract
The occurrence of post-exercise proteinuria was investigated in intact and splenectomized dogs after treadmill running and swimming and compared to control experiments. Albumin and lysozyme were measured by radial diffusion. Urinary protein was analyzed by SDS-polyacrylamide gel electrophoresis. Swimming in the splenectomized dogs increased the albumin excretion in the first 30 min after exercise from 0.03 to 0.22 mg X min-1 and the lysozyme excretion in the same period from 0.11 to 0.75 micrograms X min-1. Swimming in intact dogs caused smaller increase in the lysozyme and albumin excretions during the exercise period itself as well as in the albumin excretion in the first 30 min after exercise. Running had no effect on urinary albumin or lysozyme but increased the low molecular weight protein fraction in the splenectomized dogs. Plasma lactate concentrations were higher during swimming in the splenectomized dogs than in the intact dogs. Possible mechanisms of post-exercise proteinuria are discussed.
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