Lactate Accumulation for Runners and Non-Runners during Various Exercise Tests

摘要

Four runners and six non-runners were studied during various exercise tests in order to compare venous lactate accumulation. Subjects were studied on three occasions while walking on a treadmill with increases in grade at 1, 3 and 5 minute intervals. Based upon the results of these tests, each subject performed for 30 minutes, at an individually selected workload which was just above the level at which venous lactate began to increase exponentially. During the incremental work tests, lactate accumulation was delayed, both in terms of relative and absolute workload, in trained Runners. Lactate accumulation was altered by the different time intervals during the incremental tests. During the 30 minute walk, both Runners and Nonrunners showed similar lactate accumulation during the first five minutes of exercise. Between 5 and 10 minutes, Runners had a mean decrease while Nonrunners had a mean increase. This suggests that the accumulation of venous lactate is reversible during steady state exercise in trained individuals.