| Keywords |
Cold ; Uniform ; Freezer storage ; Cold store room ; Thermo-physiological response |
| Abstract |
The purpose of this study was to develop and evaluate the efficiency of jumper-style uniform for the workers in freezer storages. The experimental environment was simulated as ?20±1oC in freezer storage and +13±1oC in rest room. Five males participated as subjects, and the thermo-physiological responses were measured in three jumpertype uniform experiments: 1) Control jumper: breathable water proof fabric + PET padding + PET lining, 2) Developed Jumper A: breathable water proof fabric + Hollow Fiber padding + PCM coated PET lining, 3) Developed Jumper B: breathable water proof fabric + Hollow Fiber padding + PCM coated and Aluminium quilted lining. As a result of the tests, rectal temperature (Tre) became lower as the experimental times went by, Tre became higher in freezer storage and became lower in rest room. Tre in Jumper A had gentler down slope than in Control and B jumper. Mean skin temperature (Tsk) also became lower as the experimental times went by, and Tsk was directly influenced by the environment temperatures. Tsk in Jumper A had gentler down slope than in Control and B jumpers. Clothing microclimate temperatures (Tclo of the chest, back, jumper) were higher in jumper A, but, Clothing microclimate Humidity (Hclo of the chest, back, jumper) were higher in jumper B. Heart rate (HR) became lower as the experimental times went by, HR of Jumper A had the gentler down slope than those of Control and B jumpers. From the subjective responses on thermal sensation, degree of satisfaction and thermal comfort, in most of the parts, jumper B generated the lowest degree, that meant colder feeling than those in other two jumpers. It can be concluded that the jumper A was more effective in freezer storage than Jumper B. It is estimated that aluminium quilted lining of jumper B had two negative aspects for protecting against the cold. 1) Freezing the insensible perspiration in the jumper in the condition of below zero (oC), 2) the higher thermal conductivity of aluminium than those of air and water. |