Chronic Fatigue Syndrome is a baffling disease potentially affecting m
illions of Americans. Self-rating scales were developed to assess this
condition but have yet to be validated with objective measures of act
ivity. The present study of a 45-yr.-old man evaluated the relationshi
ps between scores on self-rating scales used to measure Chronic Fatigu
e Syndrome and actigraphy. Measured activity was related to predictors
of fatigue but not to fatigue. The implications of these findings are
discussed.