Kop WJ, Lyden A, Berlin AA, Ambrose K, Olsen C, Gracely RH, Williams DA, Clauw DJ. "Ambulatory monitoring of physical activity and symptoms in fibromyalgia and chronic fatigue syndrome." Arthritis Rheum. 2005 Jan;52(1):296-303. PMID: 15641057 Another one to add to your collection of articles showing that deconditioning is not causative nor a perpetuating factor but rather, low activity levels are actually a result of disease.