The time Course During 36 Weeks’ Endurance Training of Changes in o2 max. and Anaerobic Threshold as Determined with a new Computerized Method

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Abstract
Six healthy male subjects followed a program of endurance training for 36 wk. At 12 wk intervals each underwent an incremental exercise test to maximum on a treadmill. Minute ventilation, cardiac frequency, expired and end-tidal concentrations of O2 and CO2, O2 uptake and CO2 output were measured continuously during each test. Anaerobic threshold (AT) was determined non-invasively as the onset of sustained increases in each of the ventilatory equivalent for O2 expired and end-tidal concentrations of O2 followed by an increase in ventilatory equivalent for CO2 after a brief delay due to isocapnic buffering. A new computerized cumulative-sum method was employed. Significant increases in maximum O2 uptake (.ovrhdot.VO2 max) of 13.6%, AT (32.3%) and % AT/.ovrhdot.VO2 max (17.0%) and a significant decrease (10.2%) in cardiac frequency at an O2 uptake of 1.0 l/min (fc1.0) were observed at the completion of the training program. The time courses of the changes for each of AT, .ovrhdot.VO2 max and fc1.0 were not identical during the training. Compared with .ovrhdot.VO2 max the disproportionate increases in AT occurred earlier and were usually completed within 12 wk. .ovrhdot.VO2 max increased for the first 24 wk of training, but showed no further increase over the final 12 wk. fc1.0 decreased through the whole training period. The improved AT after training evidently is more likely to be related to improve peripheral utilization of O2 than to an improved O2 delivery to muscle.

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