| 摘要 |
<p>From a biological signal detected by a nondestructive sensor, a breath signal, a heart beat signal, and a biological signal intensity are detected. A signal extracted from these or a parameter calculated from this signal is used as an index value so as to provide a sleep stage judgment method and a judgment device. The method and the device are used for judging the sleep stage of an examinee who is sleeping. The device includes a nondestructive sensor arranged on a bed for detecting a biological signal, detection means for detecting hear beat, breath, a biological intensity signal, and the like from the output of the nondestructive sensor, and index value calculation means for evaluating the autonomic nerve from a power spectrum density obtained by subjecting the R-R interval signal detected from the heart beat signal to the Fourier transform and calculating the index value of the sleep stage. By using a plurality of parameters as index signals and a threshold value according to the sleep stage is calculated from data of a predetermined time for each of the index signals, thereby judging the sleep stage. Similarly, a sleep stage judgment method and judgment device using at least one of the parameters calculated from the nondestructive sensor signal as an index value are also disclosed.</p> |
