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Seven young, healthy subjects performed bicycle exercise with a working load leading to exhaustion after one hour of work. The tests were done in the afternoon in the fed state. The serum insulin concentrations decreased from 22 to 4 mU/l and plasma glucagon increased from 241 to 340 pg/l already after 30 min of work. The level of adipose tissue lipoprotein lipase activity (LPLA) did not fall as had been expected, but increased. The skeletal muscle LPLA was unchanged. The results indicate that during the first hour of heavy exercise the heparin-releasable LPLA in tissues is not influenced by the work induced changes in serum hormone levels.
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