Abstract
PurposeThis research aims to investigate the impacts of exercise intensity and sequence on human physiology parameters and subjective thermal sensation when wearing stab resistant body armor under daily working conditions in China [26 and 31 °C, 45–50 % relative humidity (RH)], and to investigate on the relationship between subjective judgments and objective parameters.MethodsEight male volunteers were recruited to complete 3 terms of exercises with different velocity set on treadmill for 90 min at 26 °C and 31 °C, 45–50 % RH. In Exercise 1 volunteers were seated during the test. In Exercise 2, volunteers walked with the velocity of 3 km/h in the first 45 min and 6 km/h in the left 45 min. In Exercise 3, volunteers walked with the velocity of 6 km/h in the first 45 min and 3 km/h in the left 45 min. The body core temperature, skin temperature and subjective judgments were recorded during the whole process. Analysis of variance was performed among all the tests.ResultsIndividual discrepancy of Exercise 1 is larger than that of Exercise 2 and 3. On the premise of the same walking distance and environmental conditions, core temperature in Exercise 3 is about 0.2 °C lower than that in Exercise 2 in the end; and with the velocity decrease from 6 km/h to 3 km/h in the end, thermal tolerance of Exercise 3 is about 1 degree lower than that in Exercise 2. Skin temperatures of human trunk were at least 1 °C higher than that of limbs.ConclusionsActivity narrows the individual discrepancy on core temperature. Within experimental conditions, decreasing of intensity at last stage makes the core temperature lower and the whole process much tolerable. The core temperature is more sensitive to the external disturbance on the balance of the whole body, and it can reflect the subjective thermal sensation and physical exertion.
Highlights
In recent years with terrorist incidents continuing to occur, protective clothing has become of importance, and is required to be worn for occupational safety and healthy purposes, i.e., for law enforcement internationally (Jimenez et al 2012; Majumdar et al 1997)
Hard SRBA is the first version of the SRBA, of which the protection layer is made from rigid materials
The purpose of this research is to investigate the impact of exercise intensity on human physiology parameters and subjective thermal sensation when wearing SRBA under daily working conditions in China (26 and 31 °C, 45–50 % relative humidity), and the relationship between the subjective judgement and the objective temperature change was analyzed
Summary
In recent years with terrorist incidents continuing to occur, protective clothing has become of importance, and is required to be worn for occupational safety and healthy purposes, i.e., for law enforcement internationally (Jimenez et al 2012; Majumdar et al 1997). The SRBA is divided into 3 main categories according to the material of its protection layers: hard, half hard and soft (Ding et al 2011). Excellent protection performance was presented, hard SRBA has huge limitations on the flexible action and wearing comfort (Decker et al 2007). Half hard SRBA contains both metal layer of metal wires (i.e. metal ring mesh) or metal cords (i.e. titanium foil) and textile layer, with improved flexibility (Bourgois et al 2001; Decker et al 2007). The core layer of soft SRBA is the high performance fiber fabric such as ultrahigh molecular modulus polyethylene (UHWMPE), aramids, polybenzoxazole, and polyamide (Flambard and Polo 2004; Lin et al 2011), which has become the focus of the protection products research (Ding et al 2011)
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