Temperature最新文献_第4页

Standby divers in warm to hot environments suffer heat stress and hypohydration. 在温暖或炎热的环境中，备用潜水员会遭受热应激和缺水。

Temperature Pub Date : 2025-07-20 eCollection Date: 2025-01-01 DOI: 10.1080/23328940.2025.2532249

David Hostler, Joshua T Murphey, Jaqueline Schwob, Brian M Clemency, Brian A Monaco, Hayden W Hess

{"title":"Standby divers in warm to hot environments suffer heat stress and hypohydration.","authors":"David Hostler, Joshua T Murphey, Jaqueline Schwob, Brian M Clemency, Brian A Monaco, Hayden W Hess","doi":"10.1080/23328940.2025.2532249","DOIUrl":"10.1080/23328940.2025.2532249","url":null,"abstract":"Standby divers must be fully dressed in the appropriate ensemble during military and commercial diving operations. These garments are often fully encapsulating and may result in heat stress and hypohydration when worn in warm environments. We examined the physiologic responses to heat in subjects wearing a Viking HD drysuit during 1 hour of exposure to dry-bulb temperatures of 33°C, 36°C, 39°C, and 42°C. Euhydrated subjects donned a heavy rubber drysuit and chemical protective gloves over a lightweight base layer. The drysuit was appropriate for contaminated water diving with integrated boots and neck dam. Heart rate (HR), core (Tc), and skin (Tsk) temperatures were monitored. Eight subjects (4 males) aged 27 ± 5 y completed all study conditions. HR and Tc increased over time (p < 0.001). Seated HR peaked at 138 ± 17 bpm in the 42°C and at 114 ± 13 bpm in the 39°C condition. Peak Tc was 37.0 ± 0.2, 37.1 ± 0.2, 37.4 ± 0.3, and 37.9 ± 0.5°C in the 33°C, 36°C, 39°C, and 42°C conditions, respectively, and differed between all conditions (p < 0.001) except 33°C and 36°C (p = 0.60). Sweat rates progressively increased in the warmer conditions and corresponded with a -0.20 ± 0.10, -0.40 ± 0.19, -0.69 ± 0.46, and -0.99 ± 0.55% change in body mass. Even in the absence of radiant heating, significant hypohydration and heat stress occurs in standby divers after 30 min of exposure to 42°C and after 40 min at 39°C. Awareness of the conditions and rotation of standby divers could increase mission safety in these hot environments.","PeriodicalId":36837,"journal":{"name":"Temperature","volume":"12 4","pages":"365-372"},"PeriodicalIF":0.0,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12818796/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146020185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exercise-induced dehydration does not impair cognitive performance in naturally menstruating women. 运动引起的脱水不会损害自然月经女性的认知能力。

Temperature Pub Date : 2025-07-07 eCollection Date: 2025-01-01 DOI: 10.1080/23328940.2025.2522576

Meg A Doohan, Neil King, Melanie J White, Ian B Stewart

{"title":"Exercise-induced dehydration does not impair cognitive performance in naturally menstruating women.","authors":"Meg A Doohan, Neil King, Melanie J White, Ian B Stewart","doi":"10.1080/23328940.2025.2522576","DOIUrl":"10.1080/23328940.2025.2522576","url":null,"abstract":"Despite increased female workforce engagement, research into physiological responses to thermally challenging environments has primarily focused on males. This study examined the combined impact of exercise-induced elevated core temperature and progressive dehydration on cognitive performance in naturally menstruating females. It was hypothesized that progressive increases in dehydration, heat and associated physiological responses would detrimentally affect cognitive performance. Twelve recreationally trained, naturally menstruating participants completed two experimental conditions - dehydrated (DEHY), and hydrated (HYD) - during the mid-luteal phase of their menstrual cycle. Participants cycled in a controlled environment (40°C, 20% humidity) for three 45-minute bouts at progressively reducing work intensity. Cognitive performance was assessed using the Parametric Go/No-Go (PGNG), Corsi Block Tapping (CBT), and Classic Stroop tasks, selected to represent the three key domains of executive function - cognitive inhibition, working memory, and cognitive flexibility. In DEHY, no fluid was permitted; in HYD, fluid was administered based on body mass loss. Body mass loss and serum osmolality was significantly higher in DEHY (-3.57[0.99] kg; 299[6] mOsm·kg-1), compared to HYD (-0.48[0.30] kg; 283[5] mOsm·kg-1) (p < .05). Contrary to the hypothesis, cognitive performance remained largely unaffected by exercise-induced dehydration and thermal strain. Only PGNG reaction time was significantly affected, with slower responses in the HYD condition. Despite physiological markers indicating significant dehydration, cognitive performance appeared to be largely preserved against the stressors of prolonged exercise and heat. Emphasizing the resilience of cognitive performance under these conditions strengthens understanding of sex-specific responses to environmental and physiological stress.","PeriodicalId":36837,"journal":{"name":"Temperature","volume":"12 4","pages":"351-364"},"PeriodicalIF":0.0,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12818805/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146020182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Insights into the impact of ambient heat exposure on the first 1000 days of life. 了解环境热暴露对生命最初1000天的影响。

Temperature Pub Date : 2025-06-19 eCollection Date: 2025-01-01 DOI: 10.1080/23328940.2025.2515340

Ana Bonell

引用次数: 0

Heat impacts on child mortality differ across seasons and countries: Comment on: Brimicombe C, Wieser K, Monthaler T, Jackson D, De Bont J, Chersich MF, Otto IM. Effects of ambient heat exposure on risk of all-cause mortality in children younger than 5 years in Africa: a pooled time-series analysis. Lancet Planet Health. 2024;8(9):e640-e646. doi: 10.1016/S2542-5196(24)00160-8. 高温对儿童死亡率的影响因季节和国家而异：评论：Brimicombe C， Wieser K, Monthaler T, Jackson D, De Bont J, Chersich MF, Otto IM。环境热暴露对非洲5岁以下儿童全因死亡风险的影响：一项汇总时间序列分析中国生物医学工程学报，2014;8(9):664 - 646。doi: 10.1016 / s2542 - 5196(24) 00160 - 8。

Temperature Pub Date : 2025-06-17 eCollection Date: 2025-01-01 DOI: 10.1080/23328940.2025.2514959

Chloe Brimicombe, Debra Jackson, Ilona M Otto

引用次数: 0

Humans exercising in the heat: A review on sweat models and a comparison to recent experimental datasets. 人类在高温下运动：对汗液模型的回顾和与最近实验数据集的比较。

Temperature Pub Date : 2025-06-05 eCollection Date: 2025-01-01 DOI: 10.1080/23328940.2025.2508534

Robin de Korver, Boris R M Kingma, George Havenith, Kalev Kuklane, Glen P Kenny, Robert D Meade, Arjan J H Frijns

{"title":"Humans exercising in the heat: A review on sweat models and a comparison to recent experimental datasets.","authors":"Robin de Korver, Boris R M Kingma, George Havenith, Kalev Kuklane, Glen P Kenny, Robert D Meade, Arjan J H Frijns","doi":"10.1080/23328940.2025.2508534","DOIUrl":"10.1080/23328940.2025.2508534","url":null,"abstract":"Sweating is a vital thermoregulatory mechanism in humans for maintaining thermal balance during exercise and exposure to hot environments. The development of models that predict sweat rate based on body temperature has been ongoing for over half a century. Here, we compared predicted water loss rates (WLR) from these models to actual observations collected during 780 participant-exposures in three independent laboratory-based experiments. In these experiments, male participants aged 19-50 years cycled or walked at various intensities (metabolic heat productions between 200 and 970 W), in air temperatures ranging from -40°C to 50°C, relative humidities (14% to 95%), and air velocities (<0.2 to 10 m/s), while wearing different clothing ensembles (thermal insulation 0.20 to 3.75 clo). The models' performances were evaluated by the coefficient of determination (R2) and Root Mean Square Error (RMSE). Performance varied greatly with a maximum R2 value of 0.5 and RMSE values ranging from 10.4 to 4.9 g/min. Models with a lower sweat onset core temperature setpoint performed better and most models generally underestimated the water loss at higher WLR. Optimization of the core and skin temperature setpoints suggests preferred core temperature setpoints within a narrow range (36.2°C to 36.6°C). Even with optimized inputs, R2 values were around 0.5, meaning only 50% of the variance in observed WLR was explained by the models. Better model consideration of relations between body temperature and sweat rate, and the incorporation of non-thermal exercise-induced sweat promotion, may reduce model underpredictions at higher exercise intensities.","PeriodicalId":36837,"journal":{"name":"Temperature","volume":"12 3","pages":"209-230"},"PeriodicalIF":0.0,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12416190/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145030985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Associated factors for exertional heat exhaustion-related symptoms among amateur golfers in Japan: A retrospective case-control study. 在日本业余高尔夫球手中与劳累性热衰竭相关症状的相关因素：一项回顾性病例对照研究。

Temperature Pub Date : 2025-06-03 eCollection Date: 2025-01-01 DOI: 10.1080/23328940.2025.2508489

Yosuke Nagashima, Teruhiko Hisaoka, Tomonori Sato, Yoshitomo Ehara, Akiko Horikawa, Akiyo Shiohara, Ayana Mitsume, Shigeru Mineo, Hiroaki Yoshida

{"title":"Associated factors for exertional heat exhaustion-related symptoms among amateur golfers in Japan: A retrospective case-control study.","authors":"Yosuke Nagashima, Teruhiko Hisaoka, Tomonori Sato, Yoshitomo Ehara, Akiko Horikawa, Akiyo Shiohara, Ayana Mitsume, Shigeru Mineo, Hiroaki Yoshida","doi":"10.1080/23328940.2025.2508489","DOIUrl":"10.1080/23328940.2025.2508489","url":null,"abstract":"The associated factors for exertional heat stroke among amateur golfers remain poorly understood. We conducted a case-control study to examine exertional heat exhaustion (EHE) - related symptoms among amateur golfers in Japan using a self-administered questionnaire. Retrospective case-control study design. A web-based questionnaire was administered from September to November 2024. Data were collected on basic attributes, lifestyle habits, perceived health factors, perceived playing conditions, changes in eating behavior, and EHE-related symptoms. We performed a case-control analysis using a multivariate conditional logistic regression model. The explanatory variables included lifestyle habits, health factors, playing conditions, and eating behavior; the objective variables were EHE-related symptoms. Our study included 194 participants with EHE-related symptoms and 252 control participants. The following factors were significantly associated with EHE symptoms: perceived dehydration (adjusted odds ratio [AOR], 4.65, 95% confidence intervals (CI) 3.08-7.03); sleep deprivation (AOR, 4.38, 95% CI 2.84-6.77); loss of appetite (AOR, 4.32, 95% CI 2.84-6.58); accumulated fatigue (AOR, 3.26 95% CI 1.17-1.31); mental stress (AOR, 2.71, 95% CI 1.78-4.12); average rounds of golf (AOR 1.88, 95% CI 1.14-3.13); increased sports drink consumption (AOR 2.07, 95% CI 1.20-3.56); increased consumption of salt tablets and candies (AOR 1.99, 95% CI 1.29-3.05); and increased dietary supplement intake (AOR, 1.88, 95% CI 1.14-3.11).These findings suggest that amateur golfers should assess their physical condition before play and adjust their schedules accordingly, particularly in hot weather, to minimize the risk of heat-related illnesses.","PeriodicalId":36837,"journal":{"name":"Temperature","volume":"12 3","pages":"296-311"},"PeriodicalIF":0.0,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12416163/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145030803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermosensory cues influence bodily awareness. 热感信号影响身体的意识。

Temperature Pub Date : 2025-05-01 eCollection Date: 2025-01-01 DOI: 10.1080/23328940.2025.2497671

Gerardo Salvato

引用次数: 0

Mortality due to heatstroke and exposure to cold: Evidence from India. 中暑和暴露于寒冷造成的死亡率：来自印度的证据。

Temperature Pub Date : 2025-05-01 eCollection Date: 2025-01-01 DOI: 10.1080/23328940.2025.2475420

Pradeep Guin, Nandita Bhan, Keshav Sethi

{"title":"Mortality due to heatstroke and exposure to cold: Evidence from India.","authors":"Pradeep Guin, Nandita Bhan, Keshav Sethi","doi":"10.1080/23328940.2025.2475420","DOIUrl":"10.1080/23328940.2025.2475420","url":null,"abstract":"The effects of exposure to extreme heat and cold temperatures on human health have mostly been studied in high-income countries. We examined this association by exploring the effect of extreme temperatures on mortality due to heatstroke and exposure to cold in India and by states. We used temperature data from the Indian Meteorological Department (IMD) and mortality data from the National Crime Records Bureau (NCRB) to examine trends in overall, gender, and age-specific mortality. We used structural breaks analysis to observe changes in India's mortality trends during 2001-2019. We examined the time trends in the relationship between extreme temperature and mortality for 24 Indian states from 2001 to 2014. We used panel regression and spline regression models. Between 2001 and 2019, India reported 19,693 and 15,197 deaths due to heatstroke and cold exposure, respectively. Top three states with the greatest number of deaths due to heatstroke were Andhra Pradesh, Uttar Pradesh, and Punjab; for cold exposure it was Uttar Pradesh, Punjab, and Bihar. Working-age men were significantly more susceptible to heatstroke. Spline regression results indicated that mortality varied across different temperature bins for both extreme summer and winter temperatures. Our findings demonstrate an urgent need to strengthen welfare and social support systems and invest in built environment and livelihood interventions to counter the avoidable mortality from extreme temperature events.","PeriodicalId":36837,"journal":{"name":"Temperature","volume":"12 2","pages":"179-199"},"PeriodicalIF":0.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12051615/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144040397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Salivary cortisol response to post-exercise infrared sauna declines over time. 运动后红外线桑拿的唾液皮质醇反应随时间下降。

Temperature Pub Date : 2025-04-27 eCollection Date: 2025-01-01 DOI: 10.1080/23328940.2025.2493460

Essi K Ahokas, Heikki Kyröläinen, Johanna K Ihalainen, Helen G Hanstock

{"title":"Salivary cortisol response to post-exercise infrared sauna declines over time.","authors":"Essi K Ahokas, Heikki Kyröläinen, Johanna K Ihalainen, Helen G Hanstock","doi":"10.1080/23328940.2025.2493460","DOIUrl":"10.1080/23328940.2025.2493460","url":null,"abstract":"Heat exposure after exercise may enhance recovery of physical performance but can also impose additional physiological stress on athletes. This study investigated the effects of post-exercise infrared sauna (IRS) on adrenal and autonomic nervous system (ANS) responses and examined how these responses adapt over time during a 6-week training intervention. Forty female team-sport athletes were pair-matched into an IRS-group and a control group (CON). Participants completed jumping exercises followed by IRS (10 min, 50 °C) or passive recovery and physiological assessments during two experimental trials: in the first (EX1) and in the last (EX2) week of the training intervention. The ANS responses were assessed by nocturnal heart rate (HR) and heart rate variability recorded before and after exercise session. Saliva cortisol concentrations, muscle soreness, and perceived recovery were assessed in the morning, before and after the exercise sessions. Cortisol increased by 5.1 ± 8.6 nmol/l the morning after EX1 in the IRS-group (p = 0.017), but not in the CON-group. Furthermore, a greater pre-post change in cortisol concentration was observed following EX1 (4.6 ± 10.4 nmol/l) compared to EX2 (-1.8 ± 7.6 nmol/l). The IRS-group showed a higher post-session HR in EX1 compared to the CON-group (61 ± 8 bpm vs. 55 ± 6 bpm; p = 0.019). Increased muscle soreness was observed at EX1 post36h only in the CON-group. Post-exercise IRS initially elevated physiological stress responses in female athletes. After six weeks of regular IRS use, athletes' ANS balance and cortisol response adapted, suggesting effective physiological adjustment to the heat intervention within six weeks.","PeriodicalId":36837,"journal":{"name":"Temperature","volume":"12 3","pages":"281-295"},"PeriodicalIF":0.0,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12416168/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145030921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of menopause on temperature regulation. 更年期对体温调节的影响。

Temperature Pub Date : 2025-04-23 eCollection Date: 2025-01-01 DOI: 10.1080/23328940.2025.2484499

Marie Gombert-Labedens, Kristine Vesterdorf, Andrea Fuller, Shane K Maloney, Fiona C Baker

{"title":"Effects of menopause on temperature regulation.","authors":"Marie Gombert-Labedens, Kristine Vesterdorf, Andrea Fuller, Shane K Maloney, Fiona C Baker","doi":"10.1080/23328940.2025.2484499","DOIUrl":"https://doi.org/10.1080/23328940.2025.2484499","url":null,"abstract":"Changes in thermoregulation, notably the emergence of hot flashes, occur during the menopause transition in association with reproductive hormonal changes. Hot flashes constitute the most characteristic symptom of menopause (prevalence of 50-80%), and have a substantial negative effect on quality of life. Here, we review the endocrine changes associated with menopause and the thermoregulatory system and its sensitivity to female sex hormones. We then review current knowledge on the underlying neural mechanisms of hot flashes and how the reproductive and thermoregulatory systems interact in females. We consider the kisspeptin-neurokinin B-dynorphin (KNDy) neuron complex, which becomes hyperactive when estradiol levels decrease. KNDy neurons project from the arcuate nucleus to thermoregulatory areas within the hypothalamic preoptic area, where heat loss mechanisms are triggered, including cutaneous vasodilation and sweating - characteristics of the hot flash. We describe the physiology and measurement of hot flashes and discuss the mixed research findings about thresholds for sweating in symptomatic individuals. We consider the unique situation of hot flashes that arise during sleep, and discuss the relationships between the environment, exercise, and body mass index with hot flashes. We also discuss the unique situation of surgical menopause (with oophorectomy) and cancer therapy, conditions that are associated with frequent, severe, hot flashes. We then provide an overview of treatments of hot flashes, including hormone therapy and targeted neurokinin B-antagonists, recently developed to target the neural mechanism of hot flashes. Finally, we highlight gaps in knowledge about menopausal thermoregulation and hot flashes and suggest future directions for research.","PeriodicalId":36837,"journal":{"name":"Temperature","volume":"12 2","pages":"92-132"},"PeriodicalIF":0.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12051537/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144000162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0