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Exertional heat illness

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https://www.readbyqxmd.com/read/29914698/physiological-and-perceptual-responses-in-the-elderly-to-simulated-daily-living-activities-in-uk-summer-climatic-conditions
#1
K A M Waldock, M Hayes, P W Watt, N S Maxwell
OBJECTIVES: The elderly population is at an increasingly significant health risk to heat-related illnesses and mortality when compared with younger people in the same conditions. This is due to an increased frequency and severity of heatwaves, attributed to climate change, and reduced ability of elderly individuals to dissipate excess heat. Consequently, most excess deaths and emergency visits during heatwaves occur in people aged more than 65 years. The aim of this investigation was to assess the physiological and perceptual responses of elderly people during exercise sessions equating to activities of daily living in UK summer climatic conditions...
June 15, 2018: Public Health
https://www.readbyqxmd.com/read/29850597/interactions-of-gut-microbiota-endotoxemia-immune-function-and-diet-in-exertional-heatstroke
#2
REVIEW
Lawrence E Armstrong, Elaine C Lee, Elizabeth M Armstrong
Exertional heatstroke (EHS) is a medical emergency that cannot be predicted, requires immediate whole-body cooling to reduce elevated internal body temperature, and is influenced by numerous host and environmental factors. Widely accepted predisposing factors (PDF) include prolonged or intense exercise, lack of heat acclimatization, sleep deprivation, dehydration, diet, alcohol abuse, drug use, chronic inflammation, febrile illness, older age, and nonsteroidal anti-inflammatory drug use. The present review links these factors to the human intestinal microbiota (IM) and diet, which previously have not been appreciated as PDF...
2018: Journal of Sports Medicine (Hindawi Publishing Corporation)
https://www.readbyqxmd.com/read/29790832/without-warning-worker-deaths-from-heat-2014-2016
#3
Cora Roelofs
Worker deaths from heat exposure are unlike heat deaths in the general population; workers tend to be outside in variable temperatures and younger than sixty-five years. Climate change will increase the frequency, duration, and variability of hot temperatures. Public health warning systems, such as the Heat Index of the National Weather Service, do not generally account for workers' greater likelihood of exposure to direct sunlight or exertion. Only 28% of the 79 worker heat-related fatalities during 2014-2016 occurred on days when the National Weather Service warning would have included the possibility of fatal heat stroke...
January 1, 2018: New Solutions: a Journal of Environmental and Occupational Health Policy: NS
https://www.readbyqxmd.com/read/29775421/probability-of-heat-intolerance-standardized-interpretation-of-heat-tolerance-testing-results-versus-specialist-judgment
#4
Haggai Schermann, Erin Craig, Einat Yanovich, Itay Ketko, Gary Kalmanovich, Ran Yanovich
CONTEXT:   The heat-tolerance test (HTT) is a screening tool for secondary prevention of exertional heat illness by the Israel Defense Forces. To discern participant tolerance, recruits are exposed to intermediate environmental and exercise stresses, and their physiological responses, core temperature, and heart rate are monitored. When their physiological measures rise at a higher rate or exceed the upper levels of absolute values compared with other participants, heat intolerance (HI) is diagnosed...
April 2018: Journal of Athletic Training
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/29466080/does-pre-cooling-with-whole-body-immersion-affect-thermal-sensation-or-perceived-exertion-a-critically-appraised-topic
#6
Timothy M Wohlfert, Kevin C Miller
Clinical Scenario: Exertional heat stroke (EHS) is a potentially deadly heat illness and poses a significant health risk to athletes; EHS survival rates are near 100% if properly recognized and treated.1 Whole body cold water immersion (CWI) is the most effective method of lowering body core temperature.2 Precooling (PC) with CWI before exercise may prevent severe hyperthermia and/or EHS by increasing the body's overall heat-storage capacity.3 However, PC may also alter athletes' perception of how hot they feel or how hard they are exercising...
February 21, 2018: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29415213/risk-of-exertional-heat-illnesses-associated-with-sickle-cell-trait-in-u-s-military
#7
Darrell E Singer, Celia Byrne, Ligong Chen, Stephanie Shao, Jonathan Goldsmith, David W Niebuhr
Introduction: A number of studies have found an association between sickle cell trait (SCT) and exertional heat illnesses (EHIs) including heat stroke, a potentially fatal condition. The strength of this association varied across studies, limiting the ability to quantify potential benefits of SCT-screening policies for competitive athletics and military service members. We determined the relative rate and attributable risk of developing EHI associated with being SCT positive and the EHI health care utilization...
February 5, 2018: Military Medicine
https://www.readbyqxmd.com/read/29365179/collapse-in-the-heat-from-overhydration-to-the-emergency-room-three-cases-of-exercise-associated-hyponatremia-associated-with-exertional-heat-illness
#8
Robert C Oh, Bryan Malave, Justin D Chaltry
Exertional heat illness and exercise-associated hyponatremia continue to be a problem in military and recreational events. Symptoms of hyponatremia can be mistaken for heat exhaustion or heat stroke. We describe three cases of symptomatic hyponatremia initially contributed to heat illnesses. The first soldier was a 31-yr-old female who "took a knee" at mile 6 of a 12-mile foot march. She had a core temperature of 100.9°F, a serum sodium level of 129 mmol/L, and drank approximately 4.5 quarts of water in 2 h...
March 1, 2018: Military Medicine
https://www.readbyqxmd.com/read/29332471/fatal-exertional-heat-stroke-and-american-football-players-the-need-for-regional-heat-safety-guidelines
#9
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/29147922/the-effect-of-head-to-head-competition-on-behavioural-thermoregulation-thermophysiological-strain-and-performance-during-exercise-in-the-heat
#10
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)...
May 2018: Sports Medicine
https://www.readbyqxmd.com/read/29074022/a-field-study-of-the-effectiveness-and-practicality-of-a-novel-hybrid-personal-cooling-vest-worn-during-rest-in-hong-kong-construction-industry
#11
Albert P C Chan, Ying Zhang, Faming Wang, Francis F K Wong, Daniel W M Chan
A novel hybrid cooling vest (HCV) incorporated with phase change materials (PCMs) and ventilation fans has been developed for construction workers in Hong Kong to attenuate heat stress and prevent heat-related illnesses, and its effectiveness and practicality have been validated in this study. A total of 140 wear trials involving of 140 workers were conducted in Hong Kong construction sites during the summer time. Each wear trial involves a two-day wear test, of which one day workers wore the HCV (denoted as VEST) during resting, and another day they wore traditional workwear (denoted as CON)...
December 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29066054/the-validity-of-the-heat-tolerance-test-in-prediction-of-recurrent-exertional-heat-illness-events
#12
Haggai Schermann, Yuval Heled, Chen Fleischmann, Itay Ketko, Nathan Schiffmann, Yoram Epstein, Ran Yanovich
OBJECTIVES: Heat-tolerance-testing (HTT) protocol is used as a screening test for secondary prevention of exertional heat illness (EHI) in the military. Subjects whose test results are positive (heat-intolerant, HI) are presumed to be at higher risk of repeated EHI events than heat-tolerant subjects (HT) and are therefore prevented from return to combat duty, but may return to unsupervised recreational activity. Our aim was to determine, whether HTT results predict the risk of repeated episodes of exertional heat illness (EHI)...
October 12, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29020197/sickle-cell-trait-and-heat-injury-among-us-army-soldiers
#13
D Alan Nelson, Patricia A Deuster, Francis G O'Connor, Lianne M Kurina
There is concern that sickle cell trait (SCT) increases risk of exertional collapse, a primary cause of which is heat injury. However, to our knowledge, no population-based studies among active individuals have addressed this, representing a critical evidence gap. We conducted a retrospective cohort study of SCT-tested African-American soldiers who were on active duty in the US Army anytime between January 2011 and December 2014. Using Cox proportional hazards models and adjusting for demographic and medical factors, we observed no significant associations between SCT and either mild heat injury (hazard ratio (HR) = 1...
March 1, 2018: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28910548/time-of-day-effects-of-exposure-to-solar-radiation-on-thermoregulation-during-outdoor-exercise-in-the-heat
#14
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...
2017: Chronobiology International
https://www.readbyqxmd.com/read/28910461/exertional-heat-illness-resulting-in-acute-liver-failure-and-liver-transplantation
#15
Benjamin Boni, Christopher Amann Amann
Heat illness remains a large medical burden for militaries around the world. Mitigating the incidence as well as the complications of heat illness must remain on the forefront of operational planning when operating in hot environments. We report the case of a 27-year-old male U.S. Marine who sustained a heat-related illness resulting in fulminant liver failure and permanent disability. The patient was transferred from the field to a civilian hospital. On hospital day 5, liver failure was identified. The patient was transferred to a transplant center, where he successfully received a liver transplant...
December 0: Journal of Special Operations Medicine: a Peer Reviewed Journal for SOF Medical Professionals
https://www.readbyqxmd.com/read/28885961/effectiveness-of-ice-sheet-cooling-following-exertional-hyperthermia
#16
Cory L Butts, Debora L Spisla, J D Adams, Cody R Smith, Kathleen M Paulsen, Aaron R Caldwell, Matthew S Ganio, Brendon P McDermott
BACKGROUND: The procedure of wrapping a heat casualty in ice-water soaked bed sheets to reduce core temperature has received little investigation, despite the practice and recommendation for its use in some military settings. Thus, the purpose of this study was to investigate the cooling efficacy of ice-sheet cooling (ISC) following exertional hyperthermia. METHODS: 13 (11 males, 2 females) participants (age = 23 ± 3 years, height = 176.5 ± 10.3 cm, mass = 78...
September 2017: Military Medicine
https://www.readbyqxmd.com/read/28885960/international-classification-of-disease-coding-of-exertional-heat-illness-in-u-s-army-soldiers
#17
David W DeGroot, Gordon Mok, Nathanael E Hathaway
INTRODUCTION: The severity of exertional heat illnesses (EHI) ranges from relatively minor heat exhaustion to potentially life-threatening heat stroke. Epidemiological surveillance of the types of and trends in EHI incidence depends on application of the appropriate International Classification of Disease, 9th Revision (ICD-9) diagnostic code. However, data examining whether the appropriate EHI ICD-9 code is selected are lacking. The purpose of this study was to determine whether the appropriate ICD-9 code is selected in a cohort of EHI casualties...
September 2017: Military Medicine
https://www.readbyqxmd.com/read/28883030/an-exertional-heat-illness-triage-tool-for-a-jungle-training-environment
#18
Mike Smith, R Withnall, M Boulter
This article introduces a practical triage tool designed to assist commanders, jungle training instructors (JTIs) and medical personnel to identify Defence Personnel (DP) with suspected exertional heat illness (EHI). The challenges of managing suspected EHI in a jungle training environment and the potential advantages to stratifying the urgency of evacuation are discussed. This tool has been designed to be an adjunct to the existing MOD mandated heat illness recognition and first aid training.
September 6, 2017: Journal of the Royal Army Medical Corps
https://www.readbyqxmd.com/read/28858055/thermoregulatory-and-perceptual-effects-of-a-percooling-garment-worn-underneath-an-american-football-uniform
#19
Megan L Keen, Kevin C Miller, Micah N Zuhl
Keen, ML, Miller, KC, and Zuhl, MN. Thermoregulatory and perceptual effects of a percooling garment worn underneath an American football uniform. J Strength Cond Res 31(11): 2983-2991, 2017-American football athletes are at the highest risk of developing exertional heat illness (EHI). We investigated whether percooling (i.e., cooling during exercise) garments affected perceptual or physiological variables in individuals exercising in the heat while wearing football uniforms. Twelve male participants (age = 24 ± 4 year, mass = 80...
November 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28808377/anti-inflammatory-potential-of-petiveria-alliacea-on-activated-raw264-7-murine-macrophages
#20
Rosa Martha Perez Gutierrez, Carlos Hoyo-Vadillo
BACKGROUND: Defense and protection to multiple harmful stimuli are the inflammation, when is self-amplified and uncontrolled is the basis of the pathogenesis of a wide variety of inflammatory illness. The aim of this study was to evaluate if Petiveria alliacea could attenuate inflammation in a murine model of RAW264 macrophages the involved model and its involved mechanism. MATERIALS AND METHODS: The ethanol extract from P. alliacea was precipitated with water and supernatant was used for this study (PW)...
July 2017: Pharmacognosy Magazine
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