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To Exercise Or Not To Exercise In Chronic Fatigue Syndrome? No Longer a Question

  [ 242 votes ]   [ Discuss This Article ] • May 26, 2004

By Andrew R. Lloyd Source: MJA 2004; 180 (9): 437-438

Much remains unknown about the enigmatic clinical disorder chronic fatigue syndrome (CFS). Apart from clear evidence implicating certain infections as a trigger, and reproducible evidence of increased rates of comorbid depression, the aetiology remains obscure.(1) Similarly, despite numerous tantalizing hypotheses of pathogenesis, including immunological, neuroendocrine and metabolic disturbances, all remain unproven.(1) On the positive side, the criteria for diagnosis are well accepted internationally,(2) and have been the subject of recent refinements to improve reliability.(3) The disorder is well recognized, and about 0.5% of patients attending general practice are identified as having CFS.(4)

What, then, of treatment for a disorder with so many unknowns? About 40 controlled trials of treatment interventions for patients with CFS have been published to date.(1,5) The most striking features of these studies are, firstly, that no curative treatment has been found, and secondly, there has been a remarkable lack of benefit demonstrated from any of the broad array of antiviral, immunological, hormonal, antidepressant and other treatments evaluated. The sole exception lies in the relief of symptoms and improvement in functional capacity provided by programs incorporating graded physical exercise. Several studies have incorporated physical exercise as a component of cognitive–behavioral therapy (CBT).

The CBT approach in treatment for patients with CFS is based upon the premise that cognitive attributions and behavioral patterns act as perpetuating factors for symptoms. In particular, given that the cardinal phenomenon of fatigue in CFS is characterized by a marked and prolonged exacerbation of symptoms following minor physical activity, patients may reach the conclusion that it is best to avoid exercise. Thus, patients may develop an understandable cognitive attribution that exercise is harmful in the short term (as symptoms are worsened) and detrimental in the longer term. This leads to altered behavior in the form of reduced physical activity with consequent deconditioning. Similarly, as sleep typically takes on a characteristic unrefreshing quality, and fatigue is dominant in the symptom complex, patients may consider that increased sleep holds promise for symptom relief and for rapid recovery. This attribution commonly leads to a behavioral pattern of phase-shifted sleep (late night to late morning) and frequent daytime naps. Accordingly, the CBT approach generally seeks to alter these cognitive attributions and modify the associated behavioral patterns.

Having established CBT as a beneficial treatment approach, subsequent studies have sought to identify the “active” components of the CBT package. In this regard, graded physical exercise therapy has been found in several studies to be significantly better than comparators such as relaxation therapy, notably in reducing symptom severity and gaining improved function.(6-8) In particular, Fulcher and White(6) reported that 16 of the 29 patients who completed exercise treatment rated themselves as “much” or “very much” better, compared with eight of the 30 patients in the “flexibility” control group. Similarly, Powell et al(7) found that 84% of a selected patient group had significantly improved functional capacity and reduced fatigue 12 months after graded exercise therapy when compared with standard medical care.

The report by Wallman et al adds to this evidence with a systematic and well-controlled evaluation of graded exercise versus relaxation over 12 weeks.(9) Importantly, these authors have incorporated the notion of “pacing” into the exercise program. This concept recognizes that individual patients with CFS differ significantly from each other in the amount of physical activity they can achieve before symptoms become exacerbated. In addition, this “threshold” beyond which symptoms worsen may vary over time. Hence, the graded exercise program allowed patients who experienced worsened symptoms to temporarily reduce exercise duration and then to resume once symptoms subsided. Their findings are noteworthy in that multiple parameters of exercise performance, such as resting systolic blood pressure and work capacity, were improved in the active group, indicating that the reconditioning component of the program was indeed effective. In addition, measures of mood and cognitive performance also showed improvement. Interestingly, the proportion of patients who rated themselves as significantly better was not different in the two groups.

Unfortunately, no commonly used measure of disability (such as the SF-36)(10) was included as a primary outcome measure, as would be typical in studies of chronic medical illness. In addition, the durability of the effects was not examined after the completion of the intervention. Finally, although “pacing” was an important component of the exercise intervention, this approach was not formally evaluated against “unpaced” exercise. Nevertheless, one can safely conclude from these studies that graded physical exercise should become a cornerstone of the management approach for patients with CFS. When applied astutely, including via “pacing”, it may not be realistic to anticipate cure, but it is realistic to expect that patients will feel better and will improve their functional capacity. In combination with appropriate interventions to improve sleep hygiene and to treat any comorbid mood disturbance,(11) patients with CFS managed in this way often achieve a substantially better quality of life while awaiting recovery.

1. Afari N, Buchwald D. Chronic fatigue syndrome: a review. Am J Psychiatry 2003; 160: 221-236.
2. Fukuda K, Straus SE, Hickie I, et al. The chronic fatigue syndrome: a comprehensive approach to its definition and study. Ann Intern Med 1994; 121: 953-959.
3. Reeves WC, Lloyd A, Vernon SD, for the International Chronic Fatigue Syndrome Study Group. Identification of ambiguities in the 1994 chronic fatigue syndrome research case definition and recommendations for resolution. BMC Health Serv Res 2003; 3: 25.
4. Wessely S, Chalder T, Hirsch S, et al. The prevalence and morbidity of chronic fatigue and chronic fatigue syndrome: a prospective primary care study. Am J Public Health 1997; 87: 1449-1455.
5. Whiting P, Bagnall AM, Sowden AJ, et al. Interventions for the treatment and management of chronic fatigue syndrome: a systematic review. JAMA 2001; 286: 1360-1368.
6. Fulcher KY, White PD. Randomised controlled trial of graded exercise in patients with the chronic fatigue syndrome. BMJ 1997; 314: 1647-1652.
7. Powell P, Bentall RP, Nye FJ, Edwards RHT. Randomised controlled trial of patient education to encourage graded exercise in chronic fatigue syndrome. BMJ 2001; 322: 1-5.
8. Wearden A, Morris R, Mullis R, et al. Randomised, double-blind, placebo-controlled treatment trial of fluoxetine and graded exercise for chronic fatigue syndrome. Br J Psychiatry 1998; 172: 485-490.
9. Wallman KE, Morton AR, Goodman C, et al. Randomised controlled trial of graded exercise in chronic fatigue. Med J Aust 2004; 180: 444-448.
10. Ware JE, Sherbourne CD. The MOS 36-item Short-Form Health Survey (SF-36): conceptual framework and item selection. Med Care 1992; 6: 473-483.
11. Royal Australasian College of Physicians Working Group. Chronic fatigue syndrome. Clinical practice guidelines — 2002. Med J Aust 2002; 176 (9 Suppl): S17-S55. Inflammation Research Unit, School of Medical Sciences, University of New South Wales, Kensington, NSW.
Andrew R Lloyd, MB BS, MD, FRACP, Professor. Correspondence: Professor A R Lloyd, Inflammation Research Unit, School of Medical Sciences, University of New South Wales, Kensington, NSW 2052.

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