Anaerobic threshold, O2 deficit and response time of O2 uptake in long, middle and short distance runners / 体力科学

Subjects were long distance runners (n=6), middle distance runners (n=6), and sprinters (n=4) . They exercised in incremental exercise and steady state exercise. The anaerobic thershold (AT), O<SUB>2</SUB>deficit at AT (AT-O<SUB>2</SUB>df), and time constant of Vo<SUB>2</SUB> (τ) which were obtained from these exercise tests were compared among three groups of runners, and the interrelationship of three parameters was elucidated. The results were as follows.<BR>1) AT-Vo<SUB>2</SUB>of long distance runners was the highest followed by the values of middle distance runners and sprinters, successively. The AT-Vo<SUB>2</SUB>per weight and per Vo<SUB>2</SUB>max also decreased in the same order.<BR>2) AT-O<SUB>2</SUB>df per weight of long distance runners was as high as that of middle distance runners, and was significantly higher than that of sprinters.<BR>3) τ of long distance runners was shorter than that of middle distance runners, but was not significantly shorter than that of sprinters. τ of long distance runners was shorter than the reported one of untrained people.<BR>4) ΔAT-Vo<SUB>2</SUB> (difference between AT-Vo<SUB>2</SUB>and Vo<SUB>2</SUB>at rest) related to neither AT-O<SUB>2</SUB>df nor τ. However, the ratio of AT-O<SUB>2</SUB>df/τ significantly related to the ΔAT-Vo<SUB>2</SUB> (r=0.795, n=16, p<0.001) . From these results, the highest values of AT-Vo<SUB>2</SUB>obtained in long distance runners would be due to both high AT-O<SUB>2</SUB>df and short τ.