@trishrhymes, some people were able to access the full paper. The links didn't work for me. Someone helpfully copied and pasted some sections of it which I will put below.
EXTRACTS FROM PAPER:
"Albeit unexplained, several descriptive studies have noted abnormalities that suggest sedentary lifestyle might contribute to the development of the disease."
"Using her own study: "No relationship between MR or volume measurement and length of disease history were found, further supporting the argument that reduced cardiac volume in CFS populations is not a result of prolonged bed rest"
Their hypothesis: "We therefore propose that the presence of plasma volume changes in some individuals may be a contributing factor to developing CFS. Underlying neuro-cardiovascular abnormalities may exist, which during a prolonged period of supine posture, are compounded by bed rest physiology"
""an innocuous event such as infection or physical illness may reasonably increase their rest to recover. This trigger may send an individual to bed, changing their experience of gravity. As bed rest physiology progresses, plasma volumes will further reduce making the orthostatic symptoms on standing more profound. These symptoms are similar to those experienced by astronauts following space flight due to issues of low blood pressure as previously explained. If the process of rest and recovery is not managed and rehabilitated adequately it could become a maintaining factor. Therefore, some severely affected CFS individuals may be more susceptible to the adverse physiological effects of bed rest."
"Following a biopsychosocial model, CFS should be recognised within the International Classification of
Functioning, disability and health (ICF).33 The ICF states that disability is no longer understood as a feature of the individual, but rather as an outcome of an interaction ofthe person with a health condition and environmental factors. Therefore, gravity may be viewed as an important environmental factor which might be accounted for when creating a therapeutic intervention"