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학술저널
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연세대학교 의과대학 Yonsei Medical Journal Yonsei Medical Journal 제56권 제1호
발행연도
2015.1
수록면
235 - 243 (9page)

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Purpose: To determine the impact of noise on heart rate variability (HRV) in men, with a focus on the noise type rather than on noise intensity. Materials and Methods:Forty college-going male volunteers were enrolled in this study and were randomlydivided into four groups according to the type of noise they were exposed to: background, traffic, speech, or mixed (traffic and speech) noise. All groups exceptthe background group (35 dB) were exposed to 45 dB sound pressure levels. We collected data on age, smoking status, alcohol consumption, and disease status from responses to self-reported questionnaires and medical examinations. We also measured HRV parameters and blood pressure levels before and after exposure to noise. The HRV parameters were evaluated while patients remained seated for 5 minutes, and frequency and time domain analyses were then performed. Results: After noise exposure, only the speech noise group showed a reduced low frequency(LF) value, reflecting the activity of both the sympathetic and parasympathetic nervous systems. The low-to-high frequency (LF/HF) ratio, which reflected the activityof the autonomic nervous system (ANS), became more stable, decreasing from 5.21 to 1.37; however, this change was not statistically significant. Conclusion:These results indicate that 45 dB(A) of noise, 10 dB(A) higher than backgroundnoise, affects the ANS. Additionally, the impact on HRV activity might differaccording to the noise quality. Further studies will be required to ascertain the role of noise type.

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