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[Objective evaluation of treatment for sleep apnea syndrome].

CPAP treatments for sleep apnea syndrome (SAS) are being established; however, there is no established evaluation method to scale the long-lasting effectiveness of the treatment. The only available method is to judge the results from each patient's subjective symptoms. We therefore tested a self-contained microcomputer with an acceleration sensor (Lifecorder) in an attempt to evaluate the effectiveness of treatments objectively. Fifteen patients with OSAS were the subjects. We keep the records of Lifecorders that were worn by the subjects a month before and a month after nasal CPAP treatment. We also assessed their daily physical activity levels; the number of steps taken, calories consumed, intensity of each activity along with improvement in their subjective symptoms. The number of steps taken in a day increased as did the calories consumed after treatment in 9 subjects. Moderate and intensive activities also increased among those 9 subjects. Our results indicate that evaluation with a Lifecorder, which is simple and inexpensive, can provide objective indicators to assess the effectiveness of treatments in patients' daily activities.