Document Detail

The relationship between oxygen uptake reserve and heart rate reserve is affected by intensity and duration during aerobic exercise at constant work rate.
MedLine Citation:
PMID:  22034854     Owner:  NLM     Status:  Publisher    
The relationship between the percentage of heart rate reserve (%HRR) and percentage of oxygen uptake reserve (%VO(2)R) has been recommended for prescribing aerobic exercise intensity. However, this relationship was derived from progressive maximal exercise testing data, and the stability of the relationship during prolonged exercise at a constant work rate has not been established. The main aim of this study was to investigate the stability of the %VO(2)R-%HRR relationship during prolonged treadmill exercise bouts performed at 3 different constant work rates. Twenty-eight men performed 4 exercise tests: (i) a ramp-incremental maximal exercise test to determine maximal heart rate (HR(max)) and maximal oxygen uptake (VO(2max)) and (ii) three 40-min exercise bouts at 60%, 70%, and 80% VO(2)R. HR and VO(2) significantly increased over time and were influenced by exercise intensity (p < 0.001 and p = 0.004, respectively). A 1:1 relationship between %HRR and %VO(2)R, and between %HRR and %VO(2max), was not observed, with mean differences of 8% (t = 5.2, p < 0.001) and 6% (t = 4.8, p < 0.001), respectively. The VO(2) values predicted from the ACSM running equation were all significantly higher than the observed VO(2) values (p < 0.001 for all comparisons), whereas a difference for HR was observed only for the tenth min of exercise at 80% VO(2)R (p = 0.041). In conclusion, the main finding of this study was that the %HRR-%VO(2)R relationship determined by linear regression, obtained from progressive maximal exercise testing, did not apply to prolonged treadmill running performed at 3 work rates.
Felipe A Cunha; Adrian W Midgley; Walace D Monteiro; Felipe K Campos; Paulo T V Farinatti
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-28
Journal Detail:
Title:  Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme     Volume:  -     ISSN:  1715-5312     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-10-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101264333     Medline TA:  Appl Physiol Nutr Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
a Physical Activity Sciences Graduate Program, Exercise Physiology Laboratory, Salgado de Oliveira University, Rio de Janeiro, Brazil.
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