Document Detail

Association between physical activity and risk of bleeding in children with hemophilia.
MedLine Citation:
PMID:  23047359     Owner:  NLM     Status:  MEDLINE    
CONTEXT: Vigorous physical activity is thought to increase risk of bleeds in children with hemophilia, but the magnitude of the risk is unknown.
OBJECTIVE: To quantify the transient increase in risk of bleeds associated with physical activity in children with hemophilia.
DESIGN, SETTING, AND PARTICIPANTS: A case-crossover study nested within a prospective cohort study was conducted at 3 pediatric hemophilia centers in Australia between July 2008 and October 2010. A total of 104 children and adolescent boys aged 4 through 18 years with moderate or severe hemophilia A or B were monitored for bleeds for up to 1 year. Following each bleed, the child or parent was interviewed to ascertain exposures to physical activity preceding the bleed. Physical activity was categorized according to expected frequency and severity of collisions. The risk of bleeds associated with physical activity was estimated by contrasting exposure to physical activity in the 8 hours before the bleed with exposures in two 8-hour control windows, controlling for levels of clotting factor in the blood.
MAIN OUTCOME MEASURES: Association of physical activity and factor level with risk of bleeding.
RESULTS: The participants were observed for 4839 person-weeks during which time 436 bleeds occurred. Of these, 336 bleeds occurred more than 2 weeks after the preceding bleed and were used in the primary analysis of risk. Compared with inactivity and category 1 activities (eg, swimming), category 2 activities (eg, basketball) were associated with a transient increase in the risk of bleeding (30.6% of bleed windows vs 24.8% of first control windows; odds ratio, 2.7; 95% CI, 1.7-4.8, P < .001). Category 3 activities (eg, wrestling) were associated with a greater transient increase in risk (7.0% of bleed windows vs 3.4% of first control windows; odds ratio, 3.7; 95% CI, 2.3-7.3, P < .001). To illustrate absolute risk increase, for a child who bleeds 5 times annually and is exposed on average to category 2 activities twice weekly and to category 3 activities once weekly, exposure to these activities was associated with only 1 of the 5 annual bleeds. For every 1% increase in clotting factor level, bleeding incidence was lower by 2% (95% CI, 1%-3%; P = .004).
CONCLUSIONS: In children and adolescents with hemophilia, vigorous physical activity was transiently associated with a moderate relative increase in risk of bleeding. Because the increased relative risk is transient, the absolute increase in risk of bleeds associated with physical activity is likely to be small.
Carolyn R Broderick; Robert D Herbert; Jane Latimer; Chris Barnes; Julie A Curtin; Erin Mathieu; Paul Monagle; Simon A Brown
Related Documents :
20625319 - Effects of individual risk factors on the residual risk of cardiovascular events in a p...
23350859 - Factors influencing time to diagnosis after abnormal mammography in diverse women.
12874609 - Is the blood pressure of people from african origin adults in the uk higher or lower th...
24306159 - Sarcopenic obesity is closely associated with metabolic syndrome.
25077469 - Impact of antepartum anemia on the development of chorioamnionitis at term.
23485839 - Impact of atherosclerotic risk factors on different ankle-brachial-index criteria--resu...
7294189 - Suicide, affective disorder, and women physicians.
15817959 - Preparing for efficacy trials of vaginal microbicides in indian women.
20736299 - Smoking and ethics: what are the duties of oncologists?
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  JAMA     Volume:  308     ISSN:  1538-3598     ISO Abbreviation:  JAMA     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-10     Completed Date:  2012-10-15     Revised Date:  2014-09-17    
Medline Journal Info:
Nlm Unique ID:  7501160     Medline TA:  JAMA     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1452-9     Citation Subset:  AIM; IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Australia / epidemiology
Child, Preschool
Cohort Studies
Cross-Over Studies
Hemophilia A / complications*
Hemophilia B / complications*
Hemorrhage / epidemiology*,  etiology
Severity of Illness Index
Comment In:
JAMA. 2012 Oct 10;308(14):1480-1   [PMID:  23047364 ]

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

Previous Document:  Prevalence of Lyme Borrelia in Ixodes persulcatus Ticks from an Area with a Confirmed Case of Lyme D...
Next Document:  Association of public reporting for percutaneous coronary intervention with utilization and outcomes...