TraliaHigh skin temperatures also affect thermal sensation and comfort. Very few studies in the present reviewApart from the normal thermoregulatory and subjective responses, heat stress may also impact worker health in terms of heat exhaustion and occasionally heat stroke. While not captured in the present review as physiological markers of heat strain (core temperature) were not measured in the workplace, Donoghue, Sinclair and Bates investigated the thermal conditions and personal risk factors and the clinical characteristics associated with 106 cases of heat exhaustion in the deep mines at Mt Isa, QLD.64 The overall incidence of heat exhaustion was 43.0 cases / million man-hours of underground work with a peak incidence rate in Pan-RAS-IN-1MedChemExpress Pan-RAS-IN-1 February at 147 cases / million-man hours. Specific to this review the workplace thermal conditions were recorded in 74 (70 ) cases. Air SF 1101 site temperature and humidity were very close to those shown in Table 2 but air velocity was lower averaging 0.5 ?0.6 m�s? (range 0.0?.0 m�s?). The incidence of heat exhaustion increased steeply when air temperature >34 C,TEMPERATUREwet bulb temperature >25 C and air velocity <1.56 m�s?. These observations highlight the critical importance of air movement in promoting sweat evaporation in conditions of high humidity.12,23,65 The occurrence of heat exhaustion in these conditions contrasts with the apparent rarity of heat casualties in sheep shearers who seem to work at higher Hprod (?50?00 W)14 compared to the highest value measured in mines (?80 Wm?; 360 W for a 2.0 m2 worker; personal communication ?Graham Bates), and in similar ambient air temperatures and air velocity but much lower humidity. Symptoms of heat exhaustion also caused soldiers to drop out from forced marches.66 Self-pacing presumably maintains tolerable levels of strain but implies that increasing environmental heat stress would affect work performance and productivity. Shearers' tallies declined by about 2 sheep per hour from averages of about 17 sheep per hour when Ta exceeded 42 C; shearing ceased on a day when Ta reached 46 C.14 Bush firefighters spent less time in active work in warmer weather. Although their active work intensity was not affected their overall energy expenditure was slightly reduced.32 In the Defense Force marches not all soldiers, particularly females, were able to complete the tasks in the allotted times, with failure rates being most common in warmer conditions.5 The lower physiological responses of non-heat acclimatised search and rescue personnel operating in the Northern Territory compared to acclimatised personnel likely reflected a behavioral response to avoid excessive stress and strain.Current gaps in knowledge and considerationsOnly three studies were identified that examined in situ occupational heat stress in the Australian construction industry. Since workers in this industry, which is one of the largest sectors in Australia, typically experience the greatest amount of outdoor environmental heat exposure, this is a clear knowledge gap that needs addressing. There also seems to be a paucity of information for the agriculture/horticulture sector, particularly for manual labor jobs such as fruit picking and grape harvesting, which are usually performed in hot weather, often by foreign workers on temporary work visas. No occupational heat stress studies were captured for the Australian Capital Territory (ACT) orTasmania. The climate within the ACT is similar to New South Wales and Vi.TraliaHigh skin temperatures also affect thermal sensation and comfort. Very few studies in the present reviewApart from the normal thermoregulatory and subjective responses, heat stress may also impact worker health in terms of heat exhaustion and occasionally heat stroke. While not captured in the present review as physiological markers of heat strain (core temperature) were not measured in the workplace, Donoghue, Sinclair and Bates investigated the thermal conditions and personal risk factors and the clinical characteristics associated with 106 cases of heat exhaustion in the deep mines at Mt Isa, QLD.64 The overall incidence of heat exhaustion was 43.0 cases / million man-hours of underground work with a peak incidence rate in February at 147 cases / million-man hours. Specific to this review the workplace thermal conditions were recorded in 74 (70 ) cases. Air temperature and humidity were very close to those shown in Table 2 but air velocity was lower averaging 0.5 ?0.6 m�s? (range 0.0?.0 m�s?). The incidence of heat exhaustion increased steeply when air temperature >34 C,TEMPERATUREwet bulb temperature >25 C and air velocity <1.56 m�s?. These observations highlight the critical importance of air movement in promoting sweat evaporation in conditions of high humidity.12,23,65 The occurrence of heat exhaustion in these conditions contrasts with the apparent rarity of heat casualties in sheep shearers who seem to work at higher Hprod (?50?00 W)14 compared to the highest value measured in mines (?80 Wm?; 360 W for a 2.0 m2 worker; personal communication ?Graham Bates), and in similar ambient air temperatures and air velocity but much lower humidity. Symptoms of heat exhaustion also caused soldiers to drop out from forced marches.66 Self-pacing presumably maintains tolerable levels of strain but implies that increasing environmental heat stress would affect work performance and productivity. Shearers' tallies declined by about 2 sheep per hour from averages of about 17 sheep per hour when Ta exceeded 42 C; shearing ceased on a day when Ta reached 46 C.14 Bush firefighters spent less time in active work in warmer weather. Although their active work intensity was not affected their overall energy expenditure was slightly reduced.32 In the Defense Force marches not all soldiers, particularly females, were able to complete the tasks in the allotted times, with failure rates being most common in warmer conditions.5 The lower physiological responses of non-heat acclimatised search and rescue personnel operating in the Northern Territory compared to acclimatised personnel likely reflected a behavioral response to avoid excessive stress and strain.Current gaps in knowledge and considerationsOnly three studies were identified that examined in situ occupational heat stress in the Australian construction industry. Since workers in this industry, which is one of the largest sectors in Australia, typically experience the greatest amount of outdoor environmental heat exposure, this is a clear knowledge gap that needs addressing. There also seems to be a paucity of information for the agriculture/horticulture sector, particularly for manual labor jobs such as fruit picking and grape harvesting, which are usually performed in hot weather, often by foreign workers on temporary work visas. No occupational heat stress studies were captured for the Australian Capital Territory (ACT) orTasmania. The climate within the ACT is similar to New South Wales and Vi.
