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https://www.readbyqxmd.com/read/29332471/fatal-exertional-heat-stroke-and-american-football-players-the-need-for-regional-heat-safety-guidelines
#1
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 13, 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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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...
November 20, 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
#8
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
#9
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
#10
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 2, 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
#11
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 3 times a day (morning, noon, afternoon) and during 3 seasons (spring, summer, fall)...
November 1, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29053928/heat-stress-risk-profiles-for-three-non-woven-coveralls
#12
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 paper 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...
October 20, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29033404/sp-prediction-of-wbgt-based-clothing-adjustment-values-from-evaporative-resistance
#13
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...
October 14, 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
#14
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
https://www.readbyqxmd.com/read/28919493/heat-stress-incident-prevalence-and-tennis-matchplay-performance-at-the-australian-open
#15
Matthew T Smith, Machar Reid, Stephanie Kovalchik, Tim O Woods, Rob Duffield
OBJECTIVES: To examine the association of wet bulb globe temperature (WBGT) with the occurrence of heat-related incidents and changes in behavioural and matchplay characteristics in men's Grand Slam tennis. DESIGN: On-court calls for trainers, doctors, cooling devices and water, post-match medical consults and matchplay characteristic data were collected from 360 Australian Open matches (first 4 rounds 2014-2016). METHODS: Data were referenced against estimated WBGT and categorised into standard zones...
September 6, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28910548/time-of-day-effects-of-exposure-to-solar-radiation-on-thermoregulation-during-outdoor-exercise-in-the-heat
#16
Hidenori Otani, Takayuki Goto, Heita Goto, Minayuki Shirato
High solar radiation has been recognised as a contributing factor to exertional heat-related illness in individuals exercising outdoors in the heat. Although solar radiation intensity has been known to have similar time-of-day variation as body temperature, the relationship between fluctuations in solar radiation associated with diurnal change in the angle of sunlight and thermoregulatory responses in individuals exercising outdoors in a hot environment remains largely unknown. The present study therefore investigated the time-of-day effects of variations in solar radiation associated with changing solar elevation angle on thermoregulatory responses during moderate-intensity outdoor exercise in the heat of summer...
September 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28895899/effects-of-heat-stress-on-construction-labor-productivity-in-hong-kong-a-case-study-of-rebar-workers
#17
Wen Yi, Albert P C Chan
Global warming is bringing more frequent and severe heat waves, and the result will be serious for vulnerable populations such as construction workers. Excessive heat stress has profound effects on physiological responses, which cause occupational injuries, fatalities and low productivity. Construction workers are particularly affected by heat stress, because of the body heat production caused by physically demanding tasks, and hot and humid working conditions. Field studies were conducted between August and September 2016 at two construction training grounds in Hong Kong...
September 12, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28804096/application-of-universal-thermal-climate-index-utci-for-assessment-of-occupational-heat-stress-in-open-pit-mines
#18
Parvin Nassiri, Mohammad Reza Monazzam, Farideh Golbabaei, Somayeh Farhang Dehghan, Athena Rafieepour, Ali Reza Mortezapour, Mehdi Asghari
The purpose of this article is to examine the applicability of Universal Thermal Climate Index (UTCI) index as an innovative index for evaluating of occupational heat stress in outdoor environments. 175 workers of 12 open-pit mines in Tehran, Iran were selected for this research study. First, the environmental variables such as air temperature, wet-bulb temperature, globe temperature, relative humidity and air flow rate were measured; then UTCI, wet-bulb globe temperature (WBGT) and heat stress index (HSI) indices were calculated...
October 7, 2017: Industrial Health
https://www.readbyqxmd.com/read/28766042/estimating-population-heat-exposure-and-impacts-on-working-people-in-conjunction-with-climate-change
#19
Tord Kjellstrom, Chris Freyberg, Bruno Lemke, Matthias Otto, David Briggs
Increased environmental heat levels as a result of climate change present a major challenge to the health, wellbeing and sustainability of human communities in already hot parts of this planet. This challenge has many facets from direct clinical health effects of daily heat exposure to indirect effects related to poor air quality, poor access to safe drinking water, poor access to nutritious and safe food and inadequate protection from disease vectors and environmental toxic chemicals. The increasing environmental heat is a threat to environmental sustainability...
August 1, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28748383/is-ambient-heat-exposure-levels-associated-with-miscarriage-or-stillbirths-in-hot-regions-a-cross-sectional-study-using-survey-data-from-the-ghana-maternal-health-survey-2007
#20
Benedict Asamoah, Tord Kjellstrom, Per-Olof Östergren
It is well established that high ambient heat could cause congenital abnormalities resulting in miscarriage or stillbirth among certain species of mammals. However, this has not been systematically studied in real field settings among humans, despite the potential value of such knowledge for estimating the impact of global warming on the human species. This study sought to test the hypothesis that maternal heat exposure during pregnancy in hot regions is associated with increased prevalence of spontaneous abortions or stillbirths and to develop an analytical strategy to use existing data from maternal health surveys and existing data on historical heat levels at a geographic grid cell level...
July 26, 2017: International Journal of Biometeorology
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