Dr. Bathon has received consultant fees and honoraria (less than $10,000 each) from Abbott, Amgen, and Centocor, and has received research support from Amgen, Biogen-Idec, and Bristol-Meyers Squibb.
Association of body composition with disability in rheumatoid arthritis: Impact of appendicular fat and lean tissue mass
Article first published online: 29 SEP 2008
Copyright © 2008 by the American College of Rheumatology
Arthritis Care & Research
Volume 59, Issue 10, pages 1407–1415, 15 October 2008
How to Cite
Giles, J. T., Bartlett, S. J., Andersen, R. E., Fontaine, K. R. and Bathon, J. M. (2008), Association of body composition with disability in rheumatoid arthritis: Impact of appendicular fat and lean tissue mass. Arthritis & Rheumatism, 59: 1407–1415. doi: 10.1002/art.24109
- Issue published online: 29 SEP 2008
- Article first published online: 29 SEP 2008
- Manuscript Accepted: 7 MAY 2008
- Manuscript Received: 28 JAN 2008
- National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH. Grant Numbers: AR-050026-01, 1K23-AR-054112-01
- Clinical Investigator Fellowship Award from the Research and Education Foundation of the American College of Rheumatology
- Johns Hopkins Bayview Medical Center General Clinical Research Center. Grant Number: M01-RR-02719
To explore the association of measures of body composition with disability in patients with rheumatoid arthritis (RA).
Patients with RA underwent total body dual-energy x-ray absorptiometry for measurement of total and regional body fat and lean mass. The associations of measures of fat and lean mass with disability, measured with the Health Assessment Questionnaire (HAQ), were explored for the total cohort and by sex, controlling for pertinent demographic, lifestyle, and RA disease and treatment covariates.
We studied 197 subjects (118 women, 79 men). Median (interquartile range) HAQ score was 0.625 (0.125–1.25) and was significantly higher, indicating worse physical function, in women than in men. HAQ score was strongly correlated with depression, pain, RA duration, duration of morning stiffness, Disease Activity Score in 28 joints, radiographic damage scores, levels of physical and sedentary activities, and body composition, with increasing fat and decreasing lean mass associated with higher HAQ scores. Appendicular fat and lean mass demonstrated the strongest association per kilogram with HAQ. Mean HAQ score was 0.52 units higher for subjects in the highest versus the lowest quartile of appendicular fat mass (P < 0.001), and 0.81 units higher for subjects in the lowest versus the highest quartile of appendicular lean mass (P < 0.001). Adjusting for demographic and RA characteristics partially attenuated these associations. The joint associations of appendicular fat and lean mass on HAQ were additive without significant interaction.
Body composition, particularly the amount of fat and lean mass located in the arms and legs, is strongly associated with disability in RA patients.