Predictors of Exercise and Effects of Exercise on Symptoms, Function, Aerobic Fitness, and Disease Outcomes of Rheumatoid Arthritis

Arthritis Rheum. 2007 Aug 15;57(6):943-52. doi: 10.1002/art.22903.

Abstract

Objective: To determine the effects of participation in a low-impact aerobic exercise program on fatigue, pain, and depression; to examine whether intervention groups compared with a control group differed on functional (grip strength and walk time) and disease activity (total joint count, erythrocyte sedimentation rate, and C-reactive protein) measures and aerobic fitness at the end of the intervention; and to test which factors predicted exercise participation.

Methods: A convenience sample of 220 adults with rheumatoid arthritis (RA), ages 40-70, was randomized to 1 of 3 groups: class exercise, home exercise using a videotape, and control group. Measures were obtained at baseline (T1), after 6 weeks of exercise (T2), and after 12 weeks of exercise (T3).

Results: Using structural equation modeling, overall symptoms (latent variable for pain, fatigue, and depression) decreased significantly at T3 (P < 0.04) for the class exercise group compared with the control group. There were significant interaction effects of time and group for the functional measures of walk time and grip strength: the treatment groups improved more than the control group (P <or= 0.005). There were no significant increases in measures of disease activity. Fatigue and perceptions of benefits and barriers to exercise affected participants' amount of exercise, supporting previous research.

Conclusion: This study supported the positive effects of exercise on walk time and grip strength, and demonstrated that fatigue and perceived benefits/barriers to exercise influenced exercise participation. Furthermore, overall symptoms of fatigue, pain, and depression were positively influenced in this selective group of patients with RA ages 40-70 years.

Publication types

  • Randomized Controlled Trial

MeSH terms

  • Adult
  • Aged
  • Arthritis, Rheumatoid / complications
  • Arthritis, Rheumatoid / physiopathology*
  • Arthritis, Rheumatoid / psychology
  • Arthritis, Rheumatoid / rehabilitation*
  • C-Reactive Protein / metabolism
  • Depression / etiology
  • Depression / therapy
  • Exercise / physiology
  • Exercise Therapy / methods*
  • Fatigue / etiology
  • Fatigue / therapy
  • Female
  • Hand Strength / physiology
  • Humans
  • Male
  • Middle Aged
  • Pain / etiology
  • Pain Management
  • Physical Fitness / physiology*
  • Predictive Value of Tests
  • Treatment Outcome
  • Walking / physiology

Substances

  • C-Reactive Protein