Screening of Track Driver’s Sleep Apnea by Subjective and Objective Measure

抄録

Usefulness of subjective sleep quality assessment by a questionnaire (OSA-MA sleep inventory) was examined in ten track drivers (age, 23-62 yr) in reference to the objective measure by cyclic variation of heart rate (CVHR) in electrocardiogram (ECG) during sleep. Total CVHR suggesting moderate-to-severe sleep apnea (average >15 cycles/h) was observed only in one subject and frequent CVHR in a limited time was detected in the same subject and two other subjects. Subjective sleep quality assessed less sleepiness on rising, good initiation and maintenance of sleep, less frequency of dreaming, refreshing feeling, and subjective sleep length as factors 1-5, respectively. The subject with high total CVHR showed factor scores <-1 SD for factors 1, 2, and 3 and reported subjective sleepiness during driving. In the two subjects with frequent CVHR in limited time, one showed factor score <-1 SD for factors 3 and 5, while the other subject did not show score <-1 SD for any of the factors. Although this is preliminary study in a small sample size, it suggests the possible associations between the subjective assessment of sleep quality and the objective measure of CVHR.