Body mass index, occupational activity, and leisure-time physical activity: an exploration of risk factors and modifiers for knee osteoarthritis in the 1946 British birth cohort

BMC Musculoskeletal Disorders

Andrew K Wills⁵  David Coggon⁴  Jack M Guralnik²  Tamara B Harris³  Diana Kuh¹  Kathryn R Martin¹ 

[1] MRC Unit for Lifelong Health and Ageing, University College London, London, UK;Department of Epidemiology and Public Health, Division of Gerontology, University of Maryland, Maryland, USA;Laboratory of Epidemiology and Population Sciences, National Institute on Aging, National Institutes of Health, 7201 Wisconsin Avenue, Room 3C309, Bethesda, Maryland 20814, USA;MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK;MRC CAiTE, School of Social & Community Medicine, University of Bristol, Bristol, UK

关键词: Occupational activity;    Physical activity;    Body mass index;    Knee osteoarthritis;   

Others  :  1130186
DOI  :  10.1186/1471-2474-14-219

 received in 2013-02-04, accepted in 2013-07-19,  发布年份 2013

【 摘 要 】

Background

Knee osteoarthritis (kOA) risk is increased by obesity and physical activities (PA) which mechanically stress the joint. We examined the associations of midlife kOA with body mass index (BMI) and activity exposure across adult life and their interaction.

Methods

Data are from a UK birth cohort of 2597 participants with a clinical assessment for kOA at age 53. At ages 36, 43 and 53 BMI (kg/m²), self-reported leisure-time PA, and occupational activity (kneeling/squatting; lifting; climbing; sitting; assigned using a job-exposure matrix) were ascertained. Associations were explored using the multiplicative logistic model.

Results

BMI was strongly and positively associated with kOA in men and women. Men and women in manual occupations also had greater odds of kOA; there was a weak suggestion that kOA risk was higher among men exposed to lifting or kneeling at work. For men, the only evidence of a multiplicative interaction between BMI and activities was for lifting (p = 0.01) at age 43; BMI conferred higher kOA risk among those most-likely to lift at work (OR per increase in BMI z-score: 3.55, 95% CI: 1.72-7.33). For women, the only evidence of an interaction was between BMI and leisure-time PA (p = 0.005) at age 43; BMI conferred higher kOA risk among those at higher PA levels (OR per increase in BMI z-score: 1.59, 95% CI: 1.26-2.00 in inactive; 1.70, 95% CI: 1.14-2.55 (less-active); and 4.44; 95% CI: 2.26-8.36 (most-active).

Conclusions

At the very least, our study suggests that more active individuals (at work and in leisure) may see a greater reduction in risk of kOA from avoiding a high BMI than those less active.

【 授权许可】

   
2013 Martin et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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