Document Detail

Optimal sampling interval to estimate heart rate at rest and during exercise in atrial fibrillation.
MedLine Citation:
PMID:  2909159     Owner:  NLM     Status:  MEDLINE    
To investigate the ideal sampling interval for the estimation of heart rate (HR) at rest and during exercise in atrial fibrillation (AF), maximal exercise testing with continuous electrocardiographic acquisition was performed in 10 patients with chronic AF (mean age 66 +/- 4 years) and 10 subjects in normal sinus rhythm (mean age 31 +/- 6 years). Measurements of HR were obtained at 9 different sampling intervals (1, 2, 3, 6, 10, 15, 20, 30 and 60 seconds) at rest and 7 different sampling intervals (1, 2, 3, 6, 10, 15 and 20 seconds) during the last 30 seconds of each minute during exercise. The HR obtained from each interval was compared with true HR (determined by a 4-minute sample at rest and by the last 30 seconds of each minute during exercise). Among patients with AF, large differences were observed between the HR obtained and true HR, both at rest and during exercise, using small sampling intervals. The mean of these differences ranged between 16 +/- 11 beats/min (range 14 to 22) using 1-second sampling intervals and 2.2 +/- 2.0 beats/min (range 1.6 to 4.4) using 20-second sampling intervals during progressive exercise. Variability of the HR obtained from a given random sample was also high when short sampling intervals were used among patients with AF. These observations were contrasted by subjects in normal sinus rhythm, among whom neither variability nor measurement error were influenced remarkably by changing the sampling interval or increasing HR.
J E Atwood; J Myers; S Sandhu; B Lachterman; R Friis; A Oshita; S Forbes; D Walsh; V Froelicher
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The American journal of cardiology     Volume:  63     ISSN:  0002-9149     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  1989 Jan 
Date Detail:
Created Date:  1989-01-26     Completed Date:  1989-01-26     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  45-8     Citation Subset:  AIM; IM    
Cardiology Section, Long Beach Veterans Administration Medical Center, California 94304.
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MeSH Terms
Atrial Fibrillation / diagnosis*
Exercise Test
Heart Rate*
Middle Aged
Physical Exertion
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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