https://www.ncbi.nlm.nih.gov/pubmed/29231037 Chronic Illn. 2017 Jan 1:1742395317746470. doi: 10.1177/1742395317746470. [Epub ahead of print] Energy envelope maintenance among patients with myalgic encephalomyelitis and chronic fatigue syndrome: Implications of limited energy reserves. O'connor K1, Sunnquist M1, Nicholson L1, Jason LA1, Newton JL2, Strand EB3. Author information Abstract Objective The Energy Envelope Theory of myalgic encephalomyelitis and chronic fatigue syndrome postulates that individuals with myalgic encephalomyelitis and chronic fatigue syndrome may experience some increase in functioning if their level of exertion consistently remains within the limits of their available energy. Findings of several studies support this theory; however, the current study is the first to explore how an individual's initial level of available energy may influence the relation between energy envelope maintenance and level of functioning. Method The functioning, activity, and symptomatology of six groups of individuals with myalgic encephalomyelitis and chronic fatigue syndrome were compared. Groups were created based upon level of available energy (higher or lower) and energy envelope adherence (underextended, within, overextended). Results Results indicate that, as expected, individuals with myalgic encephalomyelitis and chronic fatigue syndrome who had higher available energy also had better functioning than individuals with lower available energy; however, this relation was less pronounced for individuals who were overexerting themselves. Discussion These results are consistent with the Energy Envelope Theory, and they suggest that overexertion was particularly impactful for individuals with higher levels of available energy. DOI: 10.1177/1742395317746470 ----- I'd really like to look at the whole paper and very cross I can't make sci-hub work any more. I can load the site by pasting one of these into my address bar: 22.214.171.124 or 126.96.36.199; and I can input doi strings. But then nothing happens. If anyone else can make sci-hub work, and download the paper, then upload via the upload a file button, I'd be very grateful!