Applicability of Portable Recording System for Bio-phenomena During Sleep

Objectives: The purpose of this experiment was to investigate the usefulness of a bio-phenomena recording system that uses a simple and easy but high-precision portable amplifier that records the bio-phenomena of a person during sleep. Methods: Ten healthy healthy subjects and 10 bruxists in their twenties who has been explained of the purpose of the experiment were selected as subjects. Bio-phenomena of subjects during sleep, such as masseter muscle EMG, mental muscle EMG, EEG, ECG, and EOG were recorded using both a wireless telemeter system and a portable system. Analysis was performed on bio-phenomena obtained from wireless telemeter system and portable system on an arbitrarily selected section. Sleep stages, heart rate, duration of masseter muscular activity during bruxism and its cumulative value were calculated and compared between the two devices. Results: The values obtained of sleep stages, heart rate, duration of masseter muscular activity during bruxism and its cumulative value of the arbitrarily selected section were very similar for both devices, and no significant difference was found between the two devices (duration of masseter muscular activity. telemeter system: 12.18 msec, portable system: 12.11 msec, p>0.05, n.s.). Conclusions: From these results it was concluded that the bio-phenomena recording system using a portable amplifier has similar precision as the wireless telemeter system, and thus could be used clinically in analyzing sleep stages, heart rate, duration of masseter muscular activity during sleep bruxism and its cumulative value.