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READY A. ELIZABETH; QUINNEY, H. ARTHUR
Medicine & Science in Sports & Exercise: 1982
ORIGINAL INVESTIGATION: PDF Only
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ABSTRACT

The response of anaerobic threshold (AT) to endurance training and detraining was studied in 21 males (JOURNAL/mespex/04.02/00005768-198204000-00008/ENTITY_OV0398/v/2017-07-20T222043Z/r/image-png age = 25 yr). Members of the exercise group trained on a cycle ergometer at 80% of maximal oxygen uptake (JOURNAL/mespex/04.02/00005768-198204000-00007/ENTITY_OV0312/v/2017-07-20T222043Z/r/image-pngo2max) for 30 min four times per week for 9 wk. Nine weeks of detraining followed. A step-wise incremented cycle ergometer test was used to measure maximal and submaximal values of metabolic variables at 3-wk intervals. The criterion for determination of the onset of metabolic acidosis was a systematic increase in the ventilatory equivalent for O2 (JOURNAL/mespex/04.02/00005768-198204000-00007/ENTITY_OV0312/v/2017-07-20T222043Z/r/image-pngE/JOURNAL/mespex/04.02/00005768-198204000-00007/ENTITY_OV0312/v/2017-07-20T222043Z/r/image-pngo2) without an increase in the ventilatory equivalent for CO2 (JOURNAL/mespex/04.02/00005768-198204000-00007/ENTITY_OV0312/v/2017-07-20T222043Z/r/image-pngE/JOURNAL/mespex/04.02/00005768-198204000-00007/ENTITY_OV0312/v/2017-07-20T222043Z/r/image-pngco2). Significant increases and decreases of JOURNAL/mespex/04.02/00005768-198204000-00007/ENTITY_OV0312/v/2017-07-20T222043Z/r/image-pngo2max for the exercise group during training and detraining, respectively, were revealed by ANOVA. Following 9 wk of training, elevations of 70.4% and 19.4% had occurred in AT expressed as absolute JOURNAL/mespex/04.02/00005768-198204000-00007/ENTITY_OV0312/v/2017-07-20T222043Z/r/image-pngo2 (AT 1·min−1) and percent of JOURNAL/mespex/04.02/00005768-198204000-00007/ENTITY_OV0312/v/2017-07-20T222043Z/r/image-pngo2max (AT-JOURNAL/mespex/04.02/00005768-198204000-00007/ENTITY_OV0312/v/2017-07-20T222043Z/r/image-pngo2), respectively. The latter change was not statistically significant. Losses of training gains in AT (1·min−1) were significant after 6 and 9 wk of detraining. The results of this study indicate that 9 wk of training is of sufficient duration to cause a significant alteration in AT. Loss of this training gain occurs rapidly and appears to be similar to changes in JOURNAL/mespex/04.02/00005768-198204000-00007/ENTITY_OV0312/v/2017-07-20T222043Z/r/image-pngo2max.

©1982The American College of Sports Medicine