Document Detail

The effect of crossing legs on blood pressure: a randomized single-blind cross-over study.
MedLine Citation:
PMID:  10450120     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Although there is a theoretical basis for crossing legs to increase blood pressure, there are no published data addressing this question. As a result guidelines for measurement of blood pressure are not consistent in recommending that patients legs should not be crossed during measurement. OBJECTIVE: To determine the effect of crossing legs on blood pressure. METHODS: Fifty healthy volunteers and 53 patients with hypertension were randomly allocated in a study with a cross-over design to having seated blood pressure measured with their legs in three different positions: feet flat on the floor and legs crossed using two common methods. The blood pressures were assessed by an investigator who was blinded to the leg positions and used a fully automated sphygmomanometer. RESULTS: Crossing legs during blood pressure measurement increased systolic (by average 8.1 mmHg, 95% confidence interval 5.1-11.1 mmHg for method 1; 10.5 mmHg, 6.5-14.6 mmHg for method 2) and diastolic (by 4.5 mmHg, 1.5-7.5 mmHg for method 1; 4.0 mmHg, 2.0-6.0 mmHg for method 2) blood pressures in patients who have hypertension. Crossing legs increased systolic blood pressure (by 2.5 mmHg, 1.3)3.8 mmHg for method 1; 2.3 mmHg, 0.9-3.7 mmHg for method 2) in the healthy volunteers but had little effect on diastolic blood pressure. The cardiovascular-risk class increased for a large number of the hypertensive patients but for fewer of the normotensive subjects. CONCLUSIONS: Blood pressure increases when legs are crossed and this increases the estimation of cardiovascular risk for many patients. Care should be taken to ensure that the patients feet are flat on the floor when measuring their blood pressure.
G L Peters; S K Binder; N R Campbell
Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Blood pressure monitoring     Volume:  4     ISSN:  1359-5237     ISO Abbreviation:  Blood Press Monit     Publication Date:  1999 Apr 
Date Detail:
Created Date:  1999-10-12     Completed Date:  1999-10-12     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9606438     Medline TA:  Blood Press Monit     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  97-101     Citation Subset:  IM    
Divisions of General Internal Medicine, Geriatrics and Nephrology, Faculty of Medicine, The University of Calgary, Calgary, Alberta, Canada.
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MeSH Terms
Blood Pressure*
Blood Pressure Determination*
Cross-Over Studies
Hypertension / physiopathology*
Middle Aged

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

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