فهرست نشریات علمی دسترسی آزاد ایران

Background: Heat stress is a threat to those who work in high temperatures. The purpose inthis study was an examination of the cooling ability of Iranian phase change material (PCM)cold vest in hot and dry conditions in a climatic chamber. Materials and Methods: Thisexperimental study was implemented on 12 male students (age 23.7 ± 2.8 years, weight66.1 ± 11.4 kg, and VO2 max 2.53 L/min) in 2013. The heat strain score index (HSSI), skintemperature and oral temperature, and heartbeat in two phases with and without cooling vestwas measured during 30 min in a climatic chamber (temperature 38.8 ± 1.3°C humidityratio 32.9 ± 2.3%) and in two activity intensity of 2.4 and 4.8 km/h speed on the treadmill,and the data differences between groups “with” and “without” vest were tested by t‑test andrepeated measurement. The level of significance was considered as 0.05. Results: The changein heartbeat at two activities, the oral temperature and heat strain score at 4.8 km/h, did notdiffer significantly between groups (with and without vest), as expected (P > 0.05). However,the change in skin temperature at two activities, oral temperature and heat strain score at2.4 km/h, was significant between groups, as expected (P < 0.05). The average of skintemperature at 15th and 30th min during the experiment at two activities of 2.4 and 4.8 km/hwas significant. Conclusion: The findings of the study indicated that using the Iranian PCMcold vest in hot and dry climate can affect the reduction of skin temperature, oral temperature,and HSSI in light activities.