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https://www.readbyqxmd.com/read/27930487/influence-of-chronic-heat-acclimatization-on-occupational-thermal-strain-in-tropical-field-conditions
#1
Matt B Brearley, Ian Norton, Daryl Rush, Michael Hutton, Steve Smith, Linda Ward, Hector Fuentes
OBJECTIVE: To examine whether non-heat acclimatized (NHA) emergency responders endure greater physiological and perceptual strain than heat acclimatized (HA) counterparts in tropical field settings. METHODS: Eight HA and eight NHA men urban search and rescue personnel had physiological and perceptual responses compared during the initial 4 hours shift of a simulated disaster in tropical conditions (ambient temperature 34.0 °C, 48% relative humidity, wet bulb globe temperature [WBGT] 31...
December 2016: Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/27900769/influence-of-menstrual-phase-and-arid-vs-humid-heat-stress-on-autonomic-and-behavioural-thermoregulation-during-exercise-in-trained-but-unacclimated-women
#2
Tze-Huan Lei, Stephen R Stannard, Blake G Perry, Zachary J Schlader, James D Cotter, Toby Mündel
We studied thermoregulatory responses of ten well-trained (VO2 max, 57 (7) mL min(-1) kg(-1) ) eumenorrheic women exercising in dry and humid heat, across their menstrual cycle. They completed four trials, each of resting and cycling at fixed intensities (125 and 150 W), to assess autonomic regulation, then self-paced intensity (30-min work trial), to assess behavioural regulation. Trials were in early-follicular (EF) and mid-luteal (ML) phases in dry (DRY) and humid (HUM) heat matched for wet bulb globe temperature (WBGT, 27°C)...
November 29, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27882829/the-effects-of-heat-stress-on-a-number-of-hematological-parameters-and-levels-of-thyroid-hormones-in-foundry-workers
#3
Sahar Norloei, Mohammad Javad Jafari, Leila Omidi, Soheila Khodakarim, Davood Bashash, Mohammad Bagher Abdollahi, Mina Jafari
The objective of this research was to determine the effects of heat stress on some hematological parameters and thyroid hormones among foundry workers. This study was performed on 25 heat-acclimated subjects while 10 office workers were selected as the control group. Wet bulb globe temperature (WBGT) was determined to estimate the heat stress. Blood sampling was conducted before and after the daily work shift. The mean value of the WBGT index was 35 °C. The levels of plasma osmolality (p = 0.04) and white blood cells (p = 0...
November 24, 2016: International Journal of Occupational Safety and Ergonomics: JOSE
https://www.readbyqxmd.com/read/27857960/heat-strain-during-military-training-activities-the-dilemma-of-balancing-force-protection-and-operational-capability
#4
Andrew P Hunt, Daniel C Billing, Mark J Patterson, Joanne N Caldwell
Military activities in hot environments pose 2 competing demands: the requirement to perform realistic training to develop operational capability with the necessity to protect armed forces personnel against heat-related illness. To ascertain whether work duration limits for protection against heat-related illness restrict military activities, this study examined the heat strain and risks of heat-related illness when conducting a military activity above the prescribed work duration limits. Thirty-seven soldiers conducted a march (10 km; ∼5...
April 2016: Temperature: Multidisciplinary Biomedical Journal
https://www.readbyqxmd.com/read/27852154/the-influence-of-occupational-heat-exposure-on-cognitive-performance-and-blood-level-of-stress-hormones-a-field-study-report
#5
Adel Mazlomi, Farideh Golbabaei, Somayeh Farhang Dehghan, Marzieh Abbasinia, Somayeh Mahmoud Khani, Mohammad Ansari, Mostafa Hosseini
INTRODUCTION: This article aimed to investigate the effect of heat stress on cognitive performance and the blood concentration of stress hormones among workers of a foundry plant. METHODS: Seventy workers within the exposed (35 people) and unexposed (35 people) groups were studied. The wet bulb globe temperature (WBGT) index was measured for heat stress assessment. The cognitive performance tests were conducted using the Stroop color word test (SCWT) before and during working hours...
November 17, 2016: International Journal of Occupational Safety and Ergonomics: JOSE
https://www.readbyqxmd.com/read/27779310/exertional-heat-illness-and-acute-injury-related-to-ambient-wet-bulb-globe-temperature
#6
Ximena P Garzon-Villalba, Alfred Mbah, Yougui Wu, Michael Hiles, Hanna Moore, Skai W Schwartz, Thomas E Bernard
BACKGROUND: The Deepwater Horizon disaster cleanup effort provided an opportunity to examine the effects of ambient thermal conditions on exertional heat illness (EHI) and acute injury (AI). METHODS: The outcomes were daily person-based frequencies of EHI and AI. Exposures were maximum estimated WBGT (WBGTmax) and severity. Previous day's cumulative effect was assessed by introducing previous day's WBGTmax into the model. RESULTS: EHI and AI were higher in workers exposed above a WBGTmax of 20°C (RR 1...
December 2016: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/27666953/role-of-work-uniform-in-alleviating-perceptual-strain-among-construction-workers
#7
Yang Yang, Albert Ping-Chuen Chan
This study aims to examine the benefits of wearing a new construction work uniform in real-work settings. A field experiment with a randomized assignment of an intervention group to a newly designed uniform and a control group to a commercially available trade uniform was executed. A total of 568 sets of physical, physiological, perceptual, and microclimatological data were obtained. A linear mixed-effects model (LMM) was built to examine the cause-effect relationship between the Perceptual Strain Index (PeSI) and heat stressors including wet bulb globe temperature (WBGT), estimated workload (relative heart rate), exposure time, trade, workplace, and clothing type...
September 22, 2016: Industrial Health
https://www.readbyqxmd.com/read/27648423/the-past-and-future-trends-of-heat-stress-based-on-wet-bulb-globe-temperature-index-in-outdoor-environment-of-tehran-city-iran
#8
Majid Habibi Mohraz, Asghar Ghahri, Mehrdad Karimi, Farideh Golbabaei
BACKGROUND: The workers who are working in the open and warm environments are at risk of health effects of climate and heat changes. It is expected that the risk is increase with global warming. This study aimed to investigate the changes of Wet Bulb Globe Temperature (WBGT) index in the past and to predict their trend of future changes in Tehran, capital of Iran. METHODS: The meteorological data recorded in Tehran, Iran during the statistical period between 1961 and 2009 were obtained from the Iran Meteorological Organization and based on them, WBGT index was calculated and processed using Man-Kendall correlation test...
June 2016: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/27633034/heat-stress-and-inadequate-sanitary-facilities-at-workplaces-an-occupational-health-concern-for-women
#9
Vidhya Venugopal, Shanmugam Rekha, Krishnamoorthy Manikandan, Perumal Kamalakkannan Latha, Viswanathan Vennila, Nalini Ganesan, Perumal Kumaravel, Stephen Jeremiah Chinnadurai
BACKGROUND: Health concerns unique to women are growing with the large number of women venturing into different trades that expose them to hot working environments and inadequate sanitation facilities, common in many Indian workplaces. OBJECTIVE: The study was carried out to investigate the health implications of exposures to hot work environments and inadequate sanitation facilities at their workplaces for women workers. DESIGN: A cross-sectional study was conducted with 312 women workers in three occupational sectors in 2014-2015...
2016: Global Health Action
https://www.readbyqxmd.com/read/27632886/comparison-of-esophageal-rectal-and-gastrointestinal-temperatures-during-passive-rest-after-exercise-in-the-heat-the-influence-of-hydration
#10
Yuri Hosokawa, William M Adams, Douglas J Casa
CONTEXT: It is unknown how valid esophageal, rectal, and gastrointestinal temperatures (TES, TRE, and TGI) compare after exercise-induced hyperthermia in various hydration states. OBJECTIVE: The purpose of this study was to examine the differences between TES, TRE, and TGI during passive rest following exercise-induced hyperthermia under two different hydration states: euhydrated (EU) and hypohydrated (HY). DESIGN: Randomized-crossover design...
August 24, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27631650/impact-of-climatic-conditions-on-physical-activity-a-2-year-cohort-study-in-the-arabian-gulf-region
#11
Abdulla S Al-Mohannadi, Abdulaziz Farooq, Angus Burnett, Mercia Van Der Walt, Mohamed Ghaith Al-Kuwari
BACKGROUND: Little is known about the effects that climatic conditions, especially extreme heat, have on physical activity (PA) levels. The aim of this 2-year cohort analysis undertaken in the Arabian Gulf region was to assess changes in objectively-assessed PA as a result of changes in climatic conditions. METHODS: A total of 2088 adults (1390 men and 698 women) from many regions of the world were enrolled in a community health program in Qatar, were included in this study...
September 2016: Journal of Physical Activity & Health
https://www.readbyqxmd.com/read/27591709/thermoregulation-during-extended-exercise-in-the-heat-comparisons-of-fluid-volume-and-temperature
#12
Walter S Hailes, John S Cuddy, Kyle Cochrane, Brent C Ruby
OBJECTIVE: This study aimed to determine the physiological and thermoregulatory responses of individuals exercising in the heat (US military red flag conditions, wet-bulb globe temperature 31.5-32.2ºC) while consuming varied volumes of ambient temperature water and ice slurry. METHODS: Participants (N = 12) walked on a treadmill for 3 hours at approximately 40% peak aerobic capacity in a hot environment while consuming ambient temperature (35.5°C) water (W), ice slurry (0°C, two-thirds shaved ice and one-third water) at a ratio of 2 g·kg(-1) body mass every 10 minutes (FS), and reduced volume ice slurry as described at a rate of 1 g·kg(-1) body mass every 10 minutes (HS)...
September 2016: Wilderness & Environmental Medicine
https://www.readbyqxmd.com/read/27505271/exertional-heat-illness-in-american-football-players-when-is-the-risk-greatest
#13
Earl R Cooper, Michael S Ferrara, Douglas J Casa, John W Powell, Steven P Broglio, Jacob E Resch, Ronald W Courson
CONTEXT: Knowledge about the specific environmental and practice risks to participants in American intercollegiate football during preseason practices is limited. Identifying risks may mitigate occurrences of exertional heat illness (EHI). OBJECTIVE: To evaluate the associations among preseason practice day, session number, and wet bulb globe temperature (WBGT) and the incidence of EHI. DESIGN: Descriptive epidemiology study. SETTING: Sixty colleges and universities representing 5 geographic regions of the United States...
August 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27498220/heat-exposure-on-farmers-in-northeast-ghana
#14
Kwasi Frimpong, Eddie Van Etten E J, Jacques Oosthuzien, Victor Fannam Nunfam
Environmental health hazards faced by farmers, such as exposure to extreme heat stress, are a growing concern due to global climate change, particularly in tropical developing countries. In such environments, farmers are considered to be a population at risk of environmental heat exposure. The situation is exacerbated due to their farming methods that involve the use of primitive equipment and hard manual labour conducted in full sunshine under hot and humid conditions. However, there is inadequate information about the extent of heat exposure to such farmers, both at the household and farm levels...
August 6, 2016: International Journal of Biometeorology
https://www.readbyqxmd.com/read/27497777/validating-the-heat-stress-indices-for-using-in-heavy-work-activities-in-hot-and-dry-climates
#15
Roohalah Hajizadeh, Farideh Golbabaei, Somayeh Farhang Dehghan, Mohammad Hossein Beheshti, Sayed Mohammad Jafari, Fereshteh Taheri
BACKGROUND: Necessity of evaluating heat stress in the workplace, require validation of indices and selection optimal index. The present study aimed to assess the precision and validity of some heat stress indices and select the optimum index for using in heavy work activities in hot and dry climates. METHODS: It carried out on 184 workers from 40 brick kilns workshops in the city of Qom, central Iran (as representative hot and dry climates). After reviewing the working process and evaluation the activity of workers and the type of work, environmental and physiological parameters according to standards recommended by International Organization for Standardization (ISO) including ISO 7243 and ISO 9886 were measured and indices were calculated...
2016: Journal of Research in Health Sciences
https://www.readbyqxmd.com/read/27445268/comparison-of-esophageal-rectal-and-gastrointestinal-temperatures-during-passive-rest-after-exercise-in-the-heat-the-influence-of-hydration
#16
Yuri Hosokawa, William M Adams, Douglas J Casa
CONTEXT: It is unknown how valid esophageal, rectal, and gastrointestinal temperatures (TES, TRE, and TGI) compare after exercise-induced hyperthermia in various hydration states. OBJECTIVE: The purpose of this study was to examine the differences between TES, TRE, and TGI during passive rest following exercise-induced hyperthermia under two different hydration states: euhydrated (EU) and hypohydrated (HY). DESIGN: Randomized-crossover design...
July 21, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27390480/comparison-of-workers-perceptions-toward-work-climate-and-health-symptoms-between-ceramic-and-iron-foundry-workers
#17
Joydeep Majumder, Bhavani S Bagepally, Priyanka Shah, Sanjay Kotadiya, Suresh Yadav, Nibedita Naha
BACKGROUND: Workers exposed to heavy manual material handling (MMH) in a hot working environment succumb to severe physical stress and psychological stress. AIMS: (1) Recognize the heat load at workplaces of ceramic industry and iron industry, and (2) comparatively examine the characteristics of self-reported physiological responses and heat-health perception among these workers. SETTINGS AND DESIGN: Cross-sectional prospective study. MATERIALS AND METHODS: Workplace microclimate in the ceramic industry and iron industry was monitored...
January 2016: Indian Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/27360837/wet-bulb-globe-temperature-comparison-of-olympic-games-host-cities-in-2008-2012-2016-and-2020-2012-board-164-june-2-2-00-pm-3-30-pm
#18
Yuki Murata, Yuri Hosokawa, Kumiyo Kai
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27301471/estimation-of-respiratory-heat-flows-in-prediction-of-heat-strain-among-taiwanese-steel-workers
#19
Wang-Yi Chen, Yow-Jer Juang, Jung-Yu Hsieh, Perng-Jy Tsai, Chen-Peng Chen
International Organization for Standardization 7933 standard provides evaluation of required sweat rate (RSR) and predicted heat strain (PHS). This study examined and validated the approximations in these models estimating respiratory heat flows (RHFs) via convection (C res) and evaporation (E res) for application to Taiwanese foundry workers. The influence of change in RHF approximation to the validity of heat strain prediction in these models was also evaluated. The metabolic energy consumption and physiological quantities of these workers performing at different workloads under elevated wet-bulb globe temperature (30...
June 15, 2016: International Journal of Biometeorology
https://www.readbyqxmd.com/read/27178201/shading-effect-on-microclimate-and-thermal-comfort-indexes-in-integrated-crop-livestock-forest-systems-in-the-brazilian-midwest
#20
Nivaldo Karvatte, Elcio Silvério Klosowski, Roberto Giolo de Almeida, Eduardo Eustáquio Mesquita, Caroline Carvalho de Oliveira, Fabiana Villa Alves
The objective of this paper was to perform a microclimate evaluation and determine the indexes of thermal comfort indexes, in sun and shade, in integrated crop-livestock-forest systems with different arrangements of eucalyptus and native trees, in the Brazilian Midwest. The experiment was conducted at Embrapa Beef Cattle in Campo Grande, state of Mato Grosso do Sul, Brazil, from July to September 2013. The evaluations were conducted on four consecutive days, from 8:00 a.m. to 5:00 p.m., local time (GMT -4:00), with 1 hour intervals, recording the microclimate parameters: air temperature (°C), black globe temperature (°C), wet bulb temperature (°C), relative humidity (%), and wind speed (m...
December 2016: International Journal of Biometeorology
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