Abstract
Background
Inflammation is implicated in functional decline and the development of disability in aging. This study aimed to investigate the association of inflammation with physical function and muscle strength in older adults with obesity and increased cardiometabolic risk.
Design
In baseline assessments from the CROSSROADS randomized controlled trial, serum interleukin-6 (IL-6), tumor necrosis factor-α (TNFα) and C-reactive protein (hs-CRP) were assayed in 163 older adults (37% males, 24% African American, BMI 34±3, age 70±5yrs) with hypertension, dyslipidemia and/or diabetes. Physical function was assessed by sixminute walk test (6MWT), chair sit-and-reach (CSR), hand-grip and knee-extension strength; specific-strength as muscle strength/mass ratio. Analyses included ANCOVA and multiple linear regression adjusted for thigh skeletal muscle (MRI), arm lean mass (DXA) and moderate-to-vigorous intensity physical activity (MVPA; accelerometry).
Results
Higher hs-CRP (p<0.01) and IL-6 (p=0.07) were associated with lower 6MWT and CSR, respectively. A composite inflammation score combining all 3 inflammatory markers showed the strongest inverse association with 6MWT (p<0.01). MVPA moderated associations such that amongst participants who engaged in low MVPA, 6MWT distances and CSR scores were significantly lower in those with high IL-6 and TNFα (p<0.05), respectively. In participants with high MVPA, higher hs-CRP (p<0.05) and TNFα (p=0.07) were associated with poorer upper-extremity specific-strength.
Conclusions
Chronic inflammation was associated with poorer physical function and specific strength in older adults with obesity and increased cardiometabolic risk. This association was strongest in participants with multiple elevated inflammatory markers. Physical activity levels below current recommendations mitigated the deleterious effects of inflammation on lower body mobility, underscoring the benefits of exercise for preserving physical function with age.
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Acknowledgments
The authors thank the volunteers for their participation and gratefully acknowledge the staff of the UAB Metabolism Core Laboratory (Nutrition Obesity Research Center, Diabetes Research and Training Center, Center for Clinical and Translational Science) for their involvement in this study.
Funding
Funding: This study was supported by the National Institute on Aging at the National Institutes of Health (R01 AG033094), UAB Nutrition Obesity Research Center (P30 DK56336) and Diabetes Research Center (P30DK079626). JT was supported by a postgraduate research scholarship from the Agency for Science, Technology and Research (A-STAR), Singapore. JLL and JT were supported by a Career Academic Leadership Award from NIA (K07 AG043588). Funding sources had no role in the design, conduct, or reporting of the study or the decision to submit the manuscript for publication.
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Author Contributions: JT and BAG had full access to all data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: All authors. Analysis and interpretation of data: JT and BAG. Drafting of the manuscript: JT and BAG. Critical revision the manuscript for intellectual content: All authors. Read and approved the final manuscript: All authors. Obtained funding: JLL, JDA and BAG.
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Conflict of interest: The authors declared no conflicts of interest.
Ethical Standards: The University of Alabama at Birmingham Institutional Review Board approved the study and all participants provided written informed consent.
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Tay, J., Goss, A.M., Locher, J.L. et al. Physical Function and Strength in Relation to Inflammation in Older Adults with Obesity and Increased Cardiometabolic Risk. J Nutr Health Aging 23, 949–957 (2019). https://doi.org/10.1007/s12603-019-1260-4
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DOI: https://doi.org/10.1007/s12603-019-1260-4