فهرست نشریات علمی دسترسی آزاد ایران

INTRODUCTION: Exposure to noise and heat causes individuals to experience some changes inthe function of cardiovascular system in workplaces. This study aimed to find the combined effectof heat and noise on systolic and diastolic types of blood pressure in experimentally controlledconditions.METHODS: This quasi‑experimental study was performed with 12 male students in a climatic chamberin 2014. Blood pressure including systolic and diastolic was measured in the following conditions:15 min after rest in exposure to heat (40°C, relative humidity [RH]: 30%), exposure to noise with75, 85, and 95 dB rates in thermal comfort condition (22.1 ± 0.9 wet‑bulb globe temperature), andcombined exposure to heat (40°C, RH: 30%) and noise with 75, 85, and 95 dB. Friedman test wasused to analyze the data.RESULTS: The mean change of systolic blood pressure was different significantly before and afterexposure to heat and noise levels including 75, 85, and 95 dB (P = 0.015, P = 0.001, P > 0.001,P = 0.027, respectively). Although systolic and diastolic blood pressures changed drastically, it wasnot significantly different in simultaneous exposure to heat and noise.CONCLUSION: Both systolic and diastolic blood pressures decreased in exposure to heat,while exposure to different levels of noise elevates systolic and diastolic blood pressures.However, when exposed to a combination of heat and noise, subtle changes of blood pressurewere traced, which can be characterized as average, considering heat‑only and noise‑onlytension situations.