What are the main symptoms of chronic fatigue syndrome (CFS) and how does the condition affect a person’s everyday life?
Chronic fatigue syndrome (CFS) is characterised primarily by fatigue but people often report muscle pain and sleep problems as well as concentration and memory problems.
The symptoms affect people’s ability to carry out normal activities that healthy people take for granted. CFS can affect relationships, work and leisure activities.
How do existing treatments for CFS try to reduce fatigue and improve physical function?
The two most effective treatments are cognitive behaviour therapy (CBT) and graded exercise therapy (GET).
CBT is a talking therapy. The patient and therapist usually meet every week or fortnight to negotiate a way forward.
This involves setting goals that have been mutually agreed. They should be specific behaviours that are practiced regularly. They should be set at a level that is achievable at times when symptoms are at their worst as well as times when symptoms are less troublesome.
The purpose of the goal setting is to reduce fear associated with doing things and to slowly build up confidence again.
Goals often involve changing habits around sleeping in order to help improve the quality of people’s sleep.
Certain unhelpful thoughts would be discussed and alternative ways of thinking about things would be generated mutually and then individually by the individual.
In the case of an individual who is booming and busting they would be encouraged to be consistent in order to bring about some stability.
They may then be encouraged to build up activities as and when they feel able. For those who take on too much they may be encouraged to cut back and acknowledge achievements to themselves.
GET focuses primarily on exercise and in the first instance patients are encouraged to set goals around exercise that feel manageable five times per week.
In addition they are encouraged to adopt a regular sleep routine. Like CBT the goals are modest and in keeping with the individuals ability at the time. A consistent approach is important.
Initially patients are encouraged to increase the time they exercise and engage in activity. Subsequently, they are encouraged to increase the intensity of the exercise to a target of 30 minutes 5 times a week.
Please can you outline the PACE trial that was published in The Lancet in 2011. What were the main findings of this study?
We compared four different treatment approaches for CFS in the context of a clinical randomised controlled trial. They were specialist medical care alone and CBT, GET and adaptive pacing therapy (APT) when added to SMC.
We found that CBT and GET when added to specialist medical care (SMC) worked better than adaptive pacing therapy (APT) added to SMC and SMC alone in reducing fatigue and improving physical functioning.
Recently, there was a new analysis of data from the PACE trial. Why was this analysis conducted and what did it involve?
In our recent research we were interested to find out how treatment worked. We had already shown that CBT and GET when added to specialist medical care (SMC) worked better than adaptive pacing therapy (APT) added to SMC and SMC alone.
The main finding in the new study was that CBT and GET worked by reducing people’s fear of engaging in activity. In GET tolerance of walking was also important for bringing about improvements in fatigue and physical functioning.
What are fear avoidance beliefs and what impact did you find they had on the overall effect of cognitive behaviour therapy (CBT) and graded exercise therapy (GET) on outcomes?
An example of a fear avoidance belief is “I am afraid that I will make my symptoms worse if I exercise”.
Up to 60 percent of the treatment effect was explained by change in these beliefs.
How did this compare to the other mediating factors that were analysed?
Fear avoidance beliefs was the strongest mediator but we found change in other beliefs and behaviours also mediated the treatment effect but to a lesser extent.
Were you surprised by your results and what impact do you hope they will have?
We were not surprised by our findings as patients often describe in great detail their understandable concerns about engaging in activity.
Where can readers find more information?
Readers may be interested to read more about the approach we used in which case the treatment manuals are freely available on the pace trial website (www.pacetrial.org)
About Professor Trudie Chalder
Trudie Chalder is Professor of Cognitive Behavioural Psychotherapy at the Department of Psychological Medicine at King’s College London and Director of the South London and Maudsley NHS Foundation Trust’s Chronic Fatigue Service.
She is currently the Past President of the British Association of Behavioural Cognitive Psychotherapies. She has worked in the area of CFS for about 27 years.