Document Detail

Time course of the adaptive responses of aerobic power and heart rate to training.
MedLine Citation:
PMID:  7219130     Owner:  NLM     Status:  MEDLINE    
Nine subjects participated in an exercise program for 40 min/day, 6 days/wk. The training work rates were kept constant for the first 4 wk. The work rates were then increased to a higher level and kept constant for an additional 5 wk. During both training periods, maximum oxygen uptake (VO2max) increased for the first 3 wk and then remained constant. The half times (tl/2) of the increases in VO2max during the two periods were 10.3 and 10.8 days. These results provide evidence that the adaptation to endurance exercise of the system(s) that limit VO2max is rapid, with a tl/2 of less than 11 days. The total increase in VO2max in the 9 wk of training was 23%. The decreases in the heart rate and blood lactate responses to a standard submaximal exercise test also occurred within the first 2 to 3 wk of each training period. Our results show that unless the training stimulus is increased, a high intensity daily exercise program does not result in a further increase in VO2max or further decreases in the blood lactate or heart rate responses to submaximal exercise after 3 wk.
R C Hickson; J M Hagberg; A A Ehsani; J O Holloszy
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  13     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1981  
Date Detail:
Created Date:  1981-06-25     Completed Date:  1981-06-25     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  17-20     Citation Subset:  IM; S    
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MeSH Terms
Heart Rate*
Lactates / blood
Oxygen Consumption*
Physical Education and Training*
Physical Endurance
Grant Support
Reg. No./Substance:

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