2007, Piran, Slovenia
2007, Piran, Slovenia 2007, Piran, Slovenia
Environmental Ergonomics XII Igor B. Mekjavic, Stelios N. Kounalakis & Nigel A.S. Taylor (Eds.), © BIOMED, Ljubljana 2007 completion of seven learning trials for each subject, four cognitive function tests were administered: vigilance, working memory, problem solving and perceptual reaction time. Subjects voluntarily rehydrated throughout, and the average air temperature was 35.7 o C (0800-1600 hours). A portable global positioning system was mounted on each stockman, with output data revealing an average riding velocity of 5.2 km.h -1 . Figure 1: Instrumented subject ready for field testing. RESULTS Across the three months of interest (September-November: 2006), the mean 24-hour air temperature was 28.5 o C, while the relative humidity was 40.5%. For each month, the peak air temperatures progressively increased, and occurred between 1500-1600 hours, with significant cooling only occurring after work. Over the years 1991-2006, the average monthly maxima were: September: 35.5 o C; October: 37.3 o C; November: 38.1 o C. Fortunately, at these times, the relative humidity was very low (
Occupational Thermal Problems ranged between 178-333 W (females) and 212-542 W (males), with the corresponding external work rate ranges being 36-67 W (females) and 42-108 W (males). On average, these data represented only 25-40% (females) and 30-45% (males) of the maximal capacity for healthy adults of average physical fitness. Such work rates are quite sustainable for 5-8 hours in healthy adults. Approximately 66% of all core temperatures were within the range 37.3-37.7 o C, and 66% of the peak temperatures ranged between 37.6-38.8 o C. Only one stockman exceeded a core temperature of 39 o C, while four others had peaks >38.5 o C, but 0.05). That is, both the shirt and helmet behaved similarly with respect to heat transfer, such that the helmet did not appear to disadvantage stockmen more than would any other garment worn on the head. On average, stockmen reported significantly greater psychophysical strain following mustering (P
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Environmental Ergonomics XII<br />
Igor B. Mekjavic, Stelios N. Kounalakis & Nigel A.S. Taylor (Eds.), © BIOMED, Ljubljana <strong>2007</strong><br />
completion of seven learning trials for each subject, four cognitive function tests were<br />
administered: vigilance, working memory, problem solving and perceptual reaction time.<br />
Subjects voluntarily rehydrated throughout, and the average air temperature was 35.7 o C<br />
(0800-1600 hours). A portable global positioning system was mounted on each stockman,<br />
with output data revealing an average riding velocity of 5.2 km.h -1 .<br />
Figure 1: Instrumented subject ready for field testing.<br />
RESULTS<br />
Across the three months of interest (September-November: 2006), the mean 24-hour air<br />
temperature was 28.5 o C, while the relative humidity was 40.5%. For each month, the peak air<br />
temperatures progressively increased, and occurred between 1500-1600 hours, with<br />
significant cooling only occurring after work. Over the years 1991-2006, the average monthly<br />
maxima were: September: 35.5 o C; October: 37.3 o C; November: 38.1 o C. Fortunately, at these<br />
times, the relative humidity was very low (
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