This procedure appears to be effective and relatively minimally invasive. However, it is limited by the narrow working space and restriction of the manipulation of instruments.
The Morningness-Eveningness (ME) scores and body temperature readings were collected from 25 students to assess the validity of Japanese version of Horne-Östberg's ME questionnaire. Significant differences between morning and evening types were found for acrophase (peak time) of body temperature, and ME score was significantly correlated with peak time of body temperature. These results suggest that the Japanese version of the questionnaire was valid.
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