The Effect of Low Frequency Noises Exposure on the Precision of Human at the Mathematical Tasks

Anis Javadi, Siamak Pourabdian, Farhad Forouharmajd

Abstract


Background: Low‑frequency noise is produced from different sources in the working environments such as pumps. Thus, the aim of this study was to investigate the effect of low‑frequency noise on precision and focusing of the studied subjects. Methods: This cross‑sectional–interventional study was performed on 13 students of Isfahan University of Medical Sciences. The precision of individual subjects was evaluated using the mental arithmetic test. The sound sources with frequencies of 125, 250, and 1000 Hz at 75, 85, and 95 dB sound pressure levels. Also, the rate of precision was measured before the exposure (time “zero”), and at 45 and 90 min. SPSS (Ver. 26) software was used to analyze the data. Results: Comparison of the precision scores of the individuals between the frequencies of 125 and 250 Hz at the sound pressure level of 75 dB and at 45 min (P = 0.032). And 90 min (P = 0.006). And also, the frequencies of 250 Hz and 1000 Hz at the time of 45 min. At the sound pressure levels of 85 dB (P = 0.019). And 95 dB (P = 0.043) and at the time of 90 min. At the sound pressure levels of 85 dB (0.027). And 95 dB (P = 0.009) demonstrated a significant difference. Conclusions: We concluded that low frequency noises could reduce the person’s precision. While for 125 Hz noises, just increasing of the exposure time was effective on the precision reduction. But for 250 Hz noises, both parameters increasing including exposure time and sound pressure levels, was effective.

Keywords


Low frequency noise exposure; precision; sound pressure level; time

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