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Showing 2 results for Davoodi
Performance of Vests based on Nanofibers and Packages of Phase Change Materials to Reduce Thermal Stress in a Hot Work Environment: An Experimental Study
Ali Davoodizadeh, Mohsen Aliabadi, Majid Habibi Mohraz, Maryam Farhadian, Masoud Shafiee Motlagh,
Volume 11, Issue 2 (Iranian Journal of Ergonomics 2023)
Abstract
Objectives: This study aimed to investigate the effectiveness of cooling vests based on nanofibers and packages of phase change materials (PCM) in reducing the thermal stress of medical personnel in hot workplaces.
Methods: In this experimental study, 20 males were exposed to 10 combined scenarios of temperatures of 24°C and 32°C in a room simulating atmospheric conditions and having 5 samples of cooling vests. Physiological parameters, including skin surface temperature, tympanic temperature, and oral temperature were measured before and after exposure to air temperature conditions by simulating the activity metabolism of hospital workers. The normal distribution of the data was checked with the Kolmogorov-Smirnov test, and the analysis of the effect of the scenarios was performed through the analysis of variance with repeated measurements.
Results: The results confirmed that in the condition without a vest, the air temperature of 32°C compared to the air temperature of 24°C had a greater effect in increasing the tympanic body temperature (P<0.05). The significant effect of using nanofiber vests along with PCM packages was observed in reducing skin temperature, tympanic temperature, and oral temperature in hot temperature conditions with effect sizes of 0.498, 0.568, and 0.349, respectively (P<0.05). The effect size of increasing the air temperature was lower than that of the type of cooling vests on the physiological responses, indicating that the effectiveness of the designed vests is enhanced with an increase in temperature (P<0.05).
Conclusion: The use of nanofiber cooling vests and PCM packages is effective in maintaining the body temperature stability of medical personnel in hot environments due to ideal weight and acceptable effect size.

Evaluation of the Effect of Educational Intervention on the Cognitive Performance of Taxi Drivers Exposed to Heat Stress in a City in Southern Iran
Nilufar Davoodi, Arash Salahshouri, Marzieh Sadeghian,
Volume 12, Issue 3 (Iranian Journal of Ergonomics 2024)
Abstract
Objectives: One of the occupations that is exposed to a lot of heat stress is taxi drivers. Due to their working conditions, these people spend a lot of time standing next to their cars in the sun to pick up passengers, and they are also exposed to heat stress throughout the entire driving journey. Therefore, the present study aimed to evaluate the effectiveness of an educational intervention program on the cognitive performance of taxi drivers exposed to heat stress in a city in southern Iran.
Methods: The present study was a semi-experimental intervention that was conducted in three stages: initial assessment, training, and secondary assessment for 80 taxi drivers in two intervention and control groups. In the first stage, a general assessment of all drivers' knowledge and awareness of heat stress was performed, while cognitive parameters, including concentration skills and mental fatigue, were measured using a questionnaire. Then, training was given to the intervention group in both in-person and online formats. Two months after the start of training, cognitive parameters were measured for both intervention and control groups. Data analysis was also performed using SPSS software.
Results: The results after the intervention showed that the training significantly increased concentration skills and significantly reduced mental fatigue (P<0.001). Regarding concentration skills and mental fatigue, along with all subcategories of the two questionnaires, the results showed that there was no significant difference between these variables before the intervention between the two groups. However, the difference between the two groups was significant after the intervention (P<0.001).
Conclusion: Implementing an appropriate training program with follow-up over a period of two months to familiarize individuals with heat stress improved cognitive performance, and using follow-up training with a virtual structure improved the teaching and learning process and had an impact on individuals' performance.

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