Simulated Sonic Booms and Sleep : Effects of Repeated Booms of 1 . 0 Psf
نویسنده
چکیده
Eight male subjects in each of three age groups (21-26, 40-45, 60-72 years) slept in pairs in the CAMI sonic boom simulation facility for 21 consecutive nights. The first five nights were used to acclimate the subjects (nights 1 and 2) and to obtain Baseline data (nights 3-5); the 12 subsequent nights (Boom) involved the hourly presentation of simulated sonic booms at an overpressure level of 1.0 psf (as though measured "outdoors"); during four additional nights (Recovery) there were no boom presentations. All-night records of EEG, EOG, EMG, ECG, and BSR were obtained and analyzed. None of these physiological measures showed any statistically significant effect of the boom presentations on nightly sleep patterns. However, the individual booms did arouse ECG, E~, and BSR responses in all subjects; average heart rate increased during the minute following each boom (by less than one beat per minute), EMG responses occurred for 45-50 per cent of the booms, and BSR changed following 19 per cent of boom presentations. The frequency of these occurrences increased as a function of age. That these changes were probabl' mild is supported by the facts that only 5 per cent of the booms produced awakening and only 14 per cent produced shifts in stages of sleep (4 per cent of the stage shifts might be expected by chance); both of these measures showed higher frequencies of occurrence as a function of age. The changes in sleep appear roughly comparable to what might occur in response to the noise of a passing truck at 40-45 dBA.
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