This study investigates an expanded paradigm to improve health outcomes for adults with knee osteoarthritis (OA), through changes in the low end of the physical activity spectrum where much of the knee OA population resides. Our recent study found almost half of adults with knee OA were inactive, as defined by the US Department of Health and Human Services (DHHS) (i.e., no sustained 10 minute periods of moderate-to- vigorous intensity physical activity during a week) based on objective accelerometer measurement of physical activity. It is these inactive people who will be the primary focus of this study. This renewal will investigate predictors and health outcomes related to transitions from and to physical inactivity. It will also to identify evidence-based physical activity metrics and thresholds needed to maintain function and reduce disability. The study builds on our current funded work from the Osteoarthritis Initiative (OAI), a prospective, observational, cohort study of adults with or at high risk for knee OA that encompasses the full spectrum of knee OA disease severity. This proposal will utilize valuable objective longitudinal physical activity data measure by accelerometer on a subsample from the OAI national cohort (n=2015) collected by the parent study to accomplish the following: Technical Aim. Process accelerometer output into usable physical activity measures and determine inactivity/activity transition status for each person.
Aim 1. Evaluate the relationship between a transition from inactivity to activity (T0 toT1) with initia and future changes in disability and function, controlling for baseline total activity, descriptive factors, and modifiable factors.
This aim i s relevant to clinical practice Aim 2. Examine among inactive adults at baseline the relationship between the change in total activity (T0 toT1) with initial and future changes in disability and function, controlling for baseline total activity, descriptive factors, and modifiable factors.
This aim i s relevant to the design of public health interventions.
Aim 3. Identify predictors of becoming inactive.
This aim i s relevant to public policy design.
Aim 4. Develop evidence-based physical activity metrics to predict short-term (T0 toT1) function and long- term (T0 toT2) disability outcomes among adults at high risk or with knee OA (both active and inactive at baseline).
This aim i s relevant to refining physical activity public health recommendations. Findings from this proposed study have important public health implications for the design of future physical activity intervention programs to improve quality of life among the 21 million U.S. adults who have knee OA.

Public Health Relevance

This study is built upon a strong scientific framework to evaluate the longitudinal relationship between changes in physical activity and health outcomes among adults with knee OA. The aims are designed to broaden the public health and clinical practice paradigm to promote better health for persons at the low end of the physical activity spectrum. Attainable evidence-based physical activity thresholds related to good function and preventing/reducing disability may provide realistic goals to promote increased physical activity, especially in people with arthritis who have pain and mobility problems.

National Institute of Health (NIH)
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Research Project (R01)
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Neurological, Aging and Musculoskeletal Epidemiology (NAME)
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Lester, Gayle E
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Northwestern University at Chicago
Internal Medicine/Medicine
Schools of Medicine
United States
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Thoma, Louise M; Dunlop, Dorothy; Song, Jing et al. (2018) Are Older Adults With Symptomatic Knee Osteoarthritis Less Active Than the General Population? Analysis From the Osteoarthritis Initiative and the National Health and Nutrition Examination Survey. Arthritis Care Res (Hoboken) 70:1448-1454
Jayabalan, Prakash; Kocherginsky, Masha; Chang, Alison et al. (2018) Physical Activity and Worsening of Radiographic Findings in Persons With or at Higher Risk of Knee Osteoarthritis. Arthritis Care Res (Hoboken) :
Song, Jing; Chang, Alison H; Chang, Rowland W et al. (2018) Relationship of knee pain to time in moderate and light physical activities: Data from Osteoarthritis Initiative. Semin Arthritis Rheum 47:683-688
Qin, Jin; Barbour, Kamil E; Nevitt, Michael C et al. (2018) Objectively Measured Physical Activity and Risk of Knee Osteoarthritis. Med Sci Sports Exerc 50:277-283
Gilbert, Abigail L; Lee, Jungwha; Song, Jing et al. (2018) Relationship Between Self-Reported Restless Sleep and Objectively Measured Physical Activity in Adults With Knee Osteoarthritis. Arthritis Care Res (Hoboken) :
Pellegrini, Christine A; Song, Jing; Semanik, Pamela A et al. (2017) Patients Less Likely to Lose Weight Following a Knee Replacement: Results From the Osteoarthritis Initiative. J Clin Rheumatol :
Dunlop, Dorothy D; Song, Jing; Lee, Jungwha et al. (2017) Physical Activity Minimum Threshold Predicting Improved Function in Adults With Lower-Extremity Symptoms. Arthritis Care Res (Hoboken) 69:475-483
White, Daniel K; Lee, Jungwha; Song, Jing et al. (2017) Potential Functional Benefit From Light Intensity Physical Activity in Knee Osteoarthritis. Am J Prev Med 53:689-696
Pinto, Daniel; Song, Jing; Lee, Jungwha et al. (2017) Association Between Sedentary Time and Quality of Life From the Osteoarthritis Initiative: Who Might Benefit Most From Treatment? Arch Phys Med Rehabil 98:2485-2490
Song, Jing; Gilbert, Abigail L; Chang, Rowland W et al. (2017) Do Inactive Older Adults Who Increase Physical Activity Experience Less Disability: Evidence From the Osteoarthritis Initiative. J Clin Rheumatol 23:26-32

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