Symptom fluctuations and daily physical activity in patients with chronic fatigue syndrome: a case-control study.

Objectives: To compare the activity pattern of patients with chronic fatigue syndrome (CFS) with healthy sedentary subjects and examine the relationship between the different parameters of performed activity (registered by an accelerometer device) and symptom severity and fluctuation (registered by questionnaires) in patients with CFS.

Design: Case-control study. Participants were asked to wear an accelerometer device on the nondominant hand for 6 consecutive days.