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Is serum leptin related to physical function and is it modifiable through weight loss and exercise in older adults with knee osteoarthritis?

International Journal of Obesity volume 28, pages 1383–1390 (2004)Cite this article

Abstract

OBJECTIVE: To determine the effect of weight loss and exercise interventions on serum leptin and to investigate the relationship of physical function and osteoarthritis (OA) severity with serum leptin in older overweight and obese adults with knee OA. In addition, the study examined if serum leptin predicts weight loss.

DESIGN: Longitudinal, controlled clinical trial of weight loss and exercise interventions.

SUBJECTS: Community dwelling, older, overweight and obese adults (n=316; >60 years of age; body mass index ≥28.0 kg m−2) with symptomatic knee OA and self-reported difficulty in performing selected physical activities were recruited.

INTERVENTIONS: Participants were randomized into one of four groups for the 18-month study duration: Healthy Lifestyle Controls, Dietary Weight Loss (Diet), Exercise Training (Exercise), and a combination of Dietary Weight Loss and Exercise Training (Diet+Exercise). The weight loss goal for the two Diet groups was 5% from baseline at 18 months. Participants in the Exercise groups were trained for 3 days week−1, 60 min day−1.

MEASUREMENTS: Body weight, body mass index, serum leptin, physical function, and OA severity were measured at baseline, 6 months, and 18 months.

RESULTS: Diet and Diet+Exercise groups lost 5.3 and 6.1% of their weight, respectively, at 18 months with the Exercise group losing 2.9%. There was a significant main effect of weight loss on serum leptin with a decrease in serum leptin averaged across the 6- and 18-month time points for the Diet and Diet+Exercise groups compared to the other two groups (β=0.245; P<0.01). No main effect for exercise training was observed. Serum leptin was related to self-reported physical function. In all participants, a mixed model analysis demonstrated that lower levels of baseline serum leptin predict larger weight loss (β=−2.779; P=0.048).

CONCLUSION: Decreases in serum leptin may be one mechanism by which weight loss improves physical function and symptoms in OA patients.

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Acknowledgements

This project was funded by the Claude D Pepper Older Americans (Grant 5P60AG10484-00) and the General Clinical Research Center (Grant M01-RR07122).

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Authors and Affiliations

  1. Department of Health and Exercise Science, Wake Forest University, Winston-Salem, NC, USA

    G D Miller & S P Messier

  2. Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, USA

    B J Nicklas

  3. Department of Public Health Sciences, Wake Forest University School of Medicine, Winston-Salem, NC, USA

    C C Davis & W T Ambrosius

  4. Department of Medicine, Section of Rheumatology, Rush Medical College, Chicago, IL, USA

    R F Loeser

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Correspondence to G D Miller.

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Miller, G., Nicklas, B., Davis, C. et al. Is serum leptin related to physical function and is it modifiable through weight loss and exercise in older adults with knee osteoarthritis?. Int J Obes 28, 1383–1390 (2004). https://doi.org/10.1038/sj.ijo.0802737

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  • DOI: https://doi.org/10.1038/sj.ijo.0802737

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