The effect of below exposure noise threshold limit value to acute stress

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Abstract

Introduction This study aims to examine the possibility of the effect of noise with intensity below the threshold value to stress. Method The study is a quasi-experimental involved 108 subjects divided into 6 noise exposure groups of control, 0 dBA, 70 dBA, 75 dBA, 80 dBA and 85 dBA in 15 min exposure. Research subjects consisted of healthy males, aged 18 - 39 years and met the study criteria. Assessment of stress include physical stress index (PSI), the total power (TP) and low frequency/high frequency ratio (the ratio of LF/HF) measured using the test heart rate variability (HRV), adrenaline and cortisol blood levels measured before and after treatment. Result Research subjects who qualify as many as 102 people a year aged 23.99±4.77 years. Research subjects have equal characteristics between treatment groups according to the socio-demography. There is no different of PSI value, the ratio of TP and LF/HF, Adrenaline between exposure groups. Cortisol levels were positively correlated with higher levels of adrenaline (r=0.35, p<0.01) while adrenaline levels and cortisol levels were strongly positively correlated (r=0.53, p<0.01). PSI values weakly positively correlated with cortisol levels (r=0.2, p<0.05) and the ratio LF/HF were positively correlated weakly with cortisol (r=0.2, p<0.05). Discussion Effect of noise on the stress intensity visible starting at Laeq, 65 dBA and Laeq 8 hour, 8 hour 70 dBA. Correlation parameter values autonomic balance system with adrenaline and cortisol levels demonstrate the potential use of HRV as a psychophysiological assessment instruments due to noise disturbance.
Original languageEnglish
JournalBMJ Journal, Occupational & Environmental Medicine
Volume75
Issue number2
DOIs
Publication statusPublished - 1 Apr 2018

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