DIFFERENT EFFECTS OF ROAD TRAFFIC NOISE AND FROGS' CROAKING ON NIGHT SLEEP

✍ Scribed by Y. SASAZAWA; P. XIN; S. SUZUKI; T. KAWADA; M. KUROIWA; Y. TAMURA

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 235 KB
• Volume: 250
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2001.3902

✦ Synopsis

This study was designed to assess the e!ects of road tra$c noise and frogs' croaking on the objective and subjective quality of sleep in a laboratory. The subjects were seven male students aged 19}21 years. They were exposed to recorded road tra$c noise and frogs' croaking, with 49)6 and 49)5 dB(A) ¸CO , and 71)2 and 56)1 dB(A) ¸K?V , respectively. The background noise in the experimental room was 31)0 dB(A) ¸CO . The sleep EEG was recorded according to standard methods. The sleep polygraphic parameters examined were the percentage of sleep stage relative to the total sleep time (%S1, %S2, %S(3#4), %SREM, %MT), total sleep time, sleep onset latency, and awakening during sleep in minutes and sleep e$ciency. A structured sleep rating questionnaire (OSA), was administered to the subjects after they awakened. The %S2 increased and the %SREM decreased during exposure to road tra$c noise. However, no signi"cant e!ect of exposure to frogs' croaking was observed on any of the polygraphic sleep parameters. The subjective quality of sleep was degraded more by exposure to road tra$c noise than that to frogs' croaking.

2002 Academic Press