Review: aerobic exercise improves cardiovascular fitness and tender points in fibromyalgia
QUESTION: In patients with fibromyalgia, is exercise training effective for improving symptoms such as physical function, pain, and tender points?
Studies were identified by searching Medline (1966–2000), CINAHL (1982–2000), EMBASE/Excerpta Medica (1974–2000), HealthSTAR (1990–2000), Sports Discus (1975–2000), the Cochrane Controlled Trials Register (2000, Issue 4), and reviewing bibliographies of relevant articles.
Studies published in any language were selected if they were randomised controlled trials (RCTs) comparing an intervention that included an exercise component with an untreated control or other non-exercise interventions and patients had a diagnosis of fibromyalgia based on published criteria.
2 reviewers independently extracted data on sample size, details of the intervention, study quality, and outcomes. Main outcomes included pain, tender points, physical function, global wellbeing or perceived improvement, self efficacy, psychological function, fatigue, and sleep.
16 RCTs that evaluated 23 exercise interventions for fibromyalgia met the selection criteria. Types of interventions included aerobic training, flexibility training, strength training, and mixed or composite training. 13 RCTs were of moderate to high methodological quality, and 8 met the American College of Sports Medicine training guidelines. 4 RCTs (also classified as high quality training studies) with similar interventions (cycle ergometry, aerobic dance, whole body aerobics, indoor walking) and similar outcome measures were included in the meta-analysis using a random effects model. The aerobic exercise group showed greater improvement than the control group for cardiovascular fitness (standardised mean difference [SMD] 0.79, 95% CI 0.37 to 1.21) and tender points (SMD 1.19, CI 0.64 to 1.75). The groups did not differ for pain (SMD 0.57, CI –1.20 to 0.06).
In patients with fibromyalgia, aerobic exercise training is effective for improving cardiovascular fitness and tender points.
- Donna Ciliska, RN, PhD
- Professor, School of Nursing, McMaster University Clinical Consultant, Hamilton Social and Public Health Services Hamilton Ontario, Canada
Physical activity is believed to have an important influence on quality of life, morbidity, and mortality. Recently, the Institute of Medicine doubled the recommended level of daily activity to 1 hour of total exercise to include both low and high intensity activities.1
The systematic reviews by Bonaiuti et al and Busch et al sought to assess the effects of exercise on bone loss in postmenopausal women and on symptom improvement in patients with fibromyalgia, respectively. The reviews have similar strengths in their approaches: clear focused questions, use of several relevant databases for their searches, retrieval of articles in any language, and review of the bibliographies of retrieved articles to identify other studies. Bonaiuti et al also searched PEDro, the Cochrane Musculoskeletal Group registry, and contacted experts in the field, thus increasing their chances of retrieving unpublished studies and overcoming publication bias. Both reviews included only randomised trials, used the Jadad scale for quality assessment, and included only trials that compared an exercise programme with usual activity, placebo, or drug therapy.
Methodological weaknesses common to the trials in both reviews included lack of blinding of participants and care providers, and dropouts or lack of adherence to the exercise programme. Although participants could not be blinded to an exercise intervention, it is possible to blind them to the specific outcomes of the research question. Adherence to exercise programmes is an active area of current research. Busch et al also comment on participant reports of adverse outcomes of exercise, such as aggravation of soreness, tiredness, and increased pain for 3–4 days after exercise. More extensive data in this area would contribute to a better understanding of adherence issues.
An earlier review found that physical activity reduced overall mortality risk in postmenopausal women and that benefits increased with increased activity.2 The review by Bonaiuti et al focused on healthy postmenopausal women 45–70 years of age and outcomes of change in bone density and wrist fractures at 1–2 years. However, fractures were reported in only 1 study. This lack of information on the effect of exercise on fracture rates is crucial because it is unclear that changes in bone density lead to changes in fracture risk.3 Further research that aims to modify risk of fracture through interventions such as exercise must follow up women to ascertain the effect on fractures. Busch et al found evidence of limited but important changes in symptoms. Aerobic exercise had beneficial effects for patients with fibromyalgia, with improvements in aerobic performance and tender points. Pain, fatigue, and psychological functioning did not improve. The authors did not address sex differences in the effects of exercise programmes on fibromyalgia symptoms because the primary studies had varied sample composition—some included only women, some had mixed samples, and some were unidentified.
The reviews by Bonaiuti et al and Busch et al provide nurses working in a range of settings (from acute orthopaedic surgery to primary care, well women clinics) with further evidence of the potential positive effects of physical activity on outcomes in postmenopausal women and patients with fibromyalgia. Exercise clearly has beneficial effects on selected outcomes in both conditions. Clients must be apprised of the specific benefits that can realistically be expected. Nurses must also be aware of the multiple barriers facing people who are thinking of initiating an exercise programme and help clients to explore strategies to overcome such barriers.
For correspondence: Professor A Busch, School of Physical Therapy, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
Source of funding: not stated.