Lerner et al used an Energy Index (EI) to monitor the level of activity in a patient with the chronic fatigue syndrome (CFS). This can be used to monitor disability and response to therapy. The authors are from Wayne State University, William Beaumont Hospital, DCL Medical Laboratrories (Indianapolis) and the University of Michigan.
Functional Status
EI
bedridden
0
able to be out of bed 30 to 60 minutes a day
1
able to be out of bed 1 to 2 hours per day
2
able to be out of bed 2 to 4 hours per day
3
able to be out of bed 4 to 6 hours a day
4
sedentary work for 40 hours per week with difficulty
5
sedentary work for 40 hours per week, limited activities, requires daily supine rests (naps)
6
sedentary work for 40 horus per week, limited activities, no supine rests needed
7
work for 40 hours per week, active without need for naps, with light exercise
8
can exercise at half of usual level without excessive fatigue
9
normal
10
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