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https://www.readbyqxmd.com/read/29726698/on-the-use-of-wearable-physiological-monitors-to-assess-heat-strain-during-occupational-heat-stress
#1
Sean R Notley, Andreas D Flouris, Glen P Kenny
Workers in many industries are required to perform arduous work in high heat stress conditions, which can lead to rapid increases in body temperature that elevate the risk of heat-related illness or even death. Traditionally, effort to mitigate work-related heat injury has been directed to the assessment of environmental heat stress (e.g., wet-bulb globe temperature), rather than the associated physiological strain responses (e.g., heart rate, skin and core temperatures). However, since a workers physiological response to a given heat stress is modified independently by inter-individual factors (e...
May 4, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29723267/the-maximum-evaporative-potential-of-constant-wear-immersion-suits-influences-the-risk-of-excessive-heat-strain-for-helicopter-aircrew
#2
Andrew P Hunt
The heat exchange properties of aircrew clothing including a Constant Wear Immersion Suit (CWIS), and the environmental conditions in which heat strain would impair operational performance, were investigated. The maximum evaporative potential (im/clo) of six clothing ensembles (three with a flight suit (FLY) and three with a CWIS) of varying undergarment layers were measured with a heated sweating manikin. Biophysical modelling estimated the environmental conditions in which body core temperature would elevate above 38...
2018: PloS One
https://www.readbyqxmd.com/read/29667034/thermal-comfort-along-the-marathon-course-of-the-2020-tokyo-olympics
#3
Tsuyoshi Honjo, Yuhwan Seo, Yudai Yamasaki, Nobumitsu Tsunematsu, Hitoshi Yokoyama, Hiroaki Yamato, Takehiko Mikami
The Olympic Games will be held in Tokyo in 2020 and the period will be the hottest period of the year in Japan. Marathon is a sport with a large heat load, and it is said that the risk of heat stroke rises more than other sports activities. The thermal environment of the 2020 Tokyo Olympic marathon course is analyzed by using wet-bulb globe temperature (WBGT) and Universal Thermal Climate Index (UTCI) map of the center area of Tokyo. The change due to the place, the effect of the shadow of the building, and the position on the course was analyzed from the distribution of WBGT and UTCI in the short-term analysis of sunny day from August 2 to August 6, 2014...
April 17, 2018: International Journal of Biometeorology
https://www.readbyqxmd.com/read/29600340/the-effect-of-hot-days-on-occupational-heat-stress-in-the-manufacturing-industry-implications-for-workers-well-being-and-productivity
#4
Tjaša Pogačar, Ana Casanueva, Katja Kozjek, Urša Ciuha, Igor B Mekjavić, Lučka Kajfež Bogataj, Zalika Črepinšek
Climate change is expected to exacerbate heat stress at the workplace in temperate regions, such as Slovenia. It is therefore of paramount importance to study present and future summer heat conditions and analyze the impact of heat on workers. A set of climate indices based on summer mean (Tmean) and maximum (Tmax) air temperatures, such as the number of hot days (HD: Tmax above 30 °C), and Wet Bulb Globe Temperature (WBGT) were used to account for heat conditions in Slovenia at six locations in the period 1981-2010...
March 30, 2018: International Journal of Biometeorology
https://www.readbyqxmd.com/read/29594509/exertional-heat-illness-incidence-and-on-site-medical-team-preparedness-in-warm-weather
#5
Yuri Hosokawa, William M Adams, Luke N Belval, Robert J Davis, Robert A Huggins, John F Jardine, Rachel K Katch, Rebecca L Stearns, Douglas J Casa
To investigate the influence of estimated wet bulb globe temperature (WBGT) and the International Institute of Race Medicine (IIRM) activity modification guidelines on the incidence of exertional heat stroke (EHS) and heat exhaustion (HEx) and the ability of an on-site medical team to treat those afflicted. Medical records of EHS and HEx patients over a 17-year period from the New Balance Falmouth Road Race were examined. Climatologic data from nearby weather stations were obtained to calculate WBGT with the Australian Bureau of Meteorology (WBGTA ) and Liljegren (WBGTL ) models...
March 29, 2018: International Journal of Biometeorology
https://www.readbyqxmd.com/read/29590331/heat-strain-and-hydration-of-japanese-construction-workers-during-work-in-summer
#6
Satoru Ueno, Yoko Sakakibara, Naomi Hisanaga, Tatsuo Oka, Sachiko Yamaguchi-Sekino
Objectives: The aim was to ascertain hydration and heat strain of construction workers in Japan during the summer who are at the highest risk of heat-related disorders. Methods: The subjects were 23 construction workers, whose average age was 41, average weight was 69 kg, and average height was 170 cm. We measured thermal working conditions with a wet bulb globe temperature (WBGT) measurement instrument affixed to the helmet of each worker, at fixed points outdoors in the sun and indoors...
March 24, 2018: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/29332471/fatal-exertional-heat-stroke-and-american-football-players-the-need-for-regional-heat-safety-guidelines
#7
Andrew J Grundstein, Yuri Hosokawa, Douglas J Casa
CONTEXT:   Weather-based activity modification in athletics is an important way to minimize heat illnesses. However, many commonly used heat-safety guidelines include a uniform set of heat-stress thresholds that do not account for geographic differences in acclimatization. OBJECTIVE:   To determine if heat-related fatalities among American football players occurred on days with unusually stressful weather conditions based on the local climate and to assess the need for regional heat-safety guidelines...
January 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29319050/consistency-between-sweat-rate-and-wet-bulb-globe-temperature-for-the-assessment-of-heat-stress-of-people-working-outdoor-in-arid-and-semi-arid-regions
#8
Hamidreza Heidari, Farideh Golbabaei, Aliakbar Shamsipour, Abbas Rahimi Forushani, Abbasali Gaeini
BACKGROUND: Heat stress is common among workers in arid and semi-arid areas. In order to take every preventive measure to protect exposed workers against heat-related disorders, it is crucial to choose an appropriate index that accurately relates environmental parameters to physiological responses. OBJECTIVE: To investigate the consistency between 2 heat stress and strain indices, ie , sweat rate and wet bulb globe temperature (WBGT), for the assessment of heat stress of people working outdoor in arid and semi-arid regions in Iran...
January 2018: International Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/29301678/expansion-of-effective-wet-bulb-globe-temperature-for-vapor-impermeable-protective-clothing
#9
Tomonori Sakoi, Tohru Mochida, Yoshihito Kurazumi, Shin-Ichi Sawada, Yosuke Horiba, Kohei Kuwabara
The wet bulb globe temperature (WBGT) is an effective measure for risk screening to prevent heat dISOrders. However, a heat risk evaluation by WBGT requires adjustments depending on the clothing. In this study, we proposed a new effective WBGT (WBGTeff * ) for general vapor permeable clothing ensembles and vapor impermeable protective clothing that is applicable to occupants engaged in moderate intensity work with a metabolic heat production value of around 174W/m2 . WBGTeff * enables the conversion of heat stress into the scale experienced by the occupant dressed in the basic clothing ensemble (work clothes) based on the heat balances for a human body...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29301677/heat-balance-model-for-a-human-body-in-the-form-of-wet-bulb-globe-temperature-indices
#10
Tomonori Sakoi, Tohru Mochida, Yoshihito Kurazumi, Kohei Kuwabara, Yosuke Horiba, Shin-Ichi Sawada
The purpose of this study is to expand the empirically derived wet bulb globe temperature (WBGT) index to a rational thermal index based on the heat balance for a human body. We derive the heat balance model in the same form as the WBGT for a human engaged in moderate intensity work with a metabolic heat production of 174W/m2 while wearing typical vapor-permeable clothing under shady and sunny conditions. Two important relationships are revealed based on this derivation: (1) the natural wet bulb and black globe temperature coefficients in the WBGT coincide with the heat balance equation for a human body with a fixed skin wettedness of approximately 0...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29170644/an-overt-chemical-protective-garment-reduces-thermal-strain-compared-with-a-covert-garment-in-warm-wet-but-not-hot-dry-environments
#11
Matthew J Maley, Joseph T Costello, David N Borg, Aaron J E Bach, Andrew P Hunt, Ian B Stewart
Objectives: A commercial chemical, biological, radiological and nuclear (CBRN) protective covert garment has recently been developed with the aim of reducing thermal strain. A covert CBRN protective layer can be worn under other clothing, with equipment added for full chemical protection when needed. However, it is unknown whether the covert garment offers any alleviation to thermal strain during work compared with a traditional overt ensemble. Therefore, the aim of this study was to compare thermal strain and work tolerance times during work in an overt and covert ensemble offering the same level of CBRN protection...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29169925/heat-stress-incidence-and-matchplay-characteristics-in-women-s-grand-slam-tennis
#12
Matthew T Smith, Machar Reid, Stephanie Kovalchik, Tim Wood, Rob Duffield
OBJECTIVES: To explore the relationship of wet bulb globe temperature (WBGT) on heat-related incidents and alterations in matchplay and behavioural characteristics in women's tennis at the Australian Open. DESIGN: From 360 main draw Australian Open women's matches (2014-2016), data describing on-court calls for trainers, doctors, cooling devices and water, post match medical consults and matchplay characteristics were collated. METHODS: Data were referenced against estimated WBGT and categorised into standard zones (zone 5: >32...
November 15, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29154695/an-evaluation-of-portable-wet-bulb-globe-temperature-monitor-accuracy
#13
Earl Cooper, Andrew Grundstein, Adam Rosen, Jessica Miles, Jupil Ko, Patrick Curry
CONTEXT:   Wet bulb globe temperature (WBGT) is the gold standard for assessing environmental heat stress during physical activity. Many manufacturers of commercially available instruments fail to report WBGT accuracy. OBJECTIVE:   To determine the accuracy of several commercially available WBGT monitors compared with a standardized reference device. DESIGN:   Observational study. SETTING:   Field test. PATIENTS OR OTHER PARTICIPANTS:   Six commercially available WBGT devices...
December 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/29147922/the-effect-of-head-to-head-competition-on-behavioural-thermoregulation-thermophysiological-strain-and-performance-during-exercise-in-the-heat
#14
Jo Corbett, Danny K White, Martin J Barwood, Christopher R D Wagstaff, Michael J Tipton, Terry McMorris, Joseph T Costello
BACKGROUND: It has been suggested that pacing is a thermoregulatory behaviour. We investigated the effect of competition on pacing, performance and thermophysiological strain during exercise in the heat and the psychological factors mediating competition effects. METHOD: Eighteen males (maximum oxygen uptake [V O 2max] 3.69 [0.44] L min(-1)) undertook a preliminary 20-km cool (wet-bulb globe temperature [WBGT] 12 °C) cycling time trial (TT) and three experimental 20-km trials (balanced order): (i) cool TT (CoolSolo); (ii) hot (WBGT 26 °C) TT (HotSolo); (iii) hot head-to-head competition (HotH2H)...
November 17, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29122180/associations-between-heat-exposure-vigilance-and-balance-performance-in-summer-tree-fruit-harvesters
#15
June T Spector, Jennifer Krenz, Miriam Calkins, Dawn Ryan, Jose Carmona, Mengjie Pan, Anna Zemke, Paul D Sampson
BACKGROUND: We sought to evaluate potential mediators of the relationship between heat exposure and traumatic injuries in outdoor agricultural workers. METHODS: Linear mixed models were used to estimate associations between maximum work-shift Wet Bulb Globe Temperature (WBGTmax ) and post-shift vigilance (reaction time) and postural sway (total path length) in a cross-sectional sample of 46 Washington State tree fruit harvesters in August-September 2015. RESULTS: The mean (SD) WBGTmax was 27...
February 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29095037/the-heat-strain-of-various-athletic-surfaces-a-comparison-between-observed-and-modeled-wet-bulb-globe-temperatures
#16
J Luke Pryor, Riana R Pryor, Andrew Grundstein, Douglas J Casa
CONTEXT:   The National Athletic Trainers' Association recommends using onsite wet-bulb globe temperature (WBGT) measurement to determine whether to modify or cancel physical activity. However, not all practitioners do so and instead they may rely on the National Weather Service (NWS) to monitor weather conditions. OBJECTIVE:   To compare regional NWS WBGT estimates with local athletic-surface readings and compare WBGT measurements among various local athletic surfaces...
November 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/29090983/assessment-of-occupational-exposure-to-heat-stress-and-solar-ultraviolet-radiation-among-groundskeepers-in-an-eastern-north-carolina-university-setting
#17
Nicole Beck, Jo Anne G Balanay, Terri Johnson
Groundskeepers spend most of the year working outdoors, exposing them to heat and solar ultraviolet (UV) radiation and increasing their risk to related adverse health effects. Various studies on heat and UV exposures in different occupations have been published, but those on groundskeepers are rare. The purpose of this study was to assess the exposure to heat stress and solar UV radiation among groundskeepers in an eastern North Carolina university setting. Wet bulb globe temperature (WBGT) index using a heat stress monitor and UV effective irradiance (UVeff ) index using a digital UV meter were recorded in various work areas three times a day (morning, noon, afternoon) and during three seasons (spring, summer, fall)...
February 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29053928/heat-stress-risk-profiles-for-three-non-woven-coveralls
#18
Ximena P Garzón-Villalba, Yougui Wu, Candi D Ashley, Thomas E Bernard
The ACGIH® Threshold Limit Value® (TLV®) is used to limit heat stress exposures so that most workers can maintain thermal equilibrium. That is, the TLV was set to an upper limit of Sustainable exposures for most people. This article addresses the ability of the TLV to differentiate between Sustainable and Unsustainable heat exposures for four clothing ensembles over a range of environmental factors and metabolic rates (M). The four clothing ensembles (woven clothing, and particle barrier, water barrier and vapor barrier coveralls) represented a wide range of evaporative resistances...
January 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29033404/prediction-of-wbgt-based-clothing-adjustment-values-from-evaporative-resistance
#19
Thomas E Bernard, Candi D Ashley, Ximena P Garzon, Jung-Hyun Kim, Aitor Coca
Wet bulb globe temperature (WBGT) index is used by many professionals in combination with metabolic rate and clothing adjustments to assess whether a heat stress exposure is sustainable. The progressive heat stress protocol is a systematic method to prescribe a clothing adjustment value (CAV) from human wear trials, and it also provides an estimate of apparent total evaporative resistance (Re,T,a ). It is clear that there is a direct relationship between the two descriptors of clothing thermal effects with diminishing increases in CAV at high Re,T,a ...
December 7, 2017: Industrial Health
https://www.readbyqxmd.com/read/28944274/time-motion-analysis-as-a-novel-approach-for-evaluating-the-impact-of-environmental-heat-exposure-on-labor-loss-in-agriculture-workers
#20
Leonidas G Ioannou, Lydia Tsoutsoubi, George Samoutis, Lucka Kajfez Bogataj, Glen P Kenny, Lars Nybo, Tord Kjellstrom, Andreas D Flouris
Introduction: In this study we (i) introduced time-motion analysis for assessing the impact of workplace heat on the work shift time spent doing labor (WTL) of grape-picking workers, (ii) examined whether seasonal environmental differences can influence their WTL, and (iii) investigated whether their WTL can be assessed by monitoring productivity or the vineyard manager's estimate of WTL. Methods: Seven grape-picking workers were assessed during the summer and/or autumn via video throughout four work shifts...
2017: Temperature: Multidisciplinary Biomedical Journal
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