heat acclimatization can increase performance of athlete and occupational for physical activity in heat condition.
for this purpose we have to train for adaptation in heat condition regularly. but I have some question about chronic heat stress.
does living in heat climate can lead to chronic fatigue?
does hyperthermia and heat illness occur without any symptom chronically?
Dear Seyyed,
Maybe the following papers will help you:
Qian S, Li M, Li G, Liu K, Li B, Jiang Q, Li L, Yang Z, Sun G. Environmental heat stress enhances mental fatigue during sustained attention task performing: evidence from an ASL perfusion study. Behav Brain Res 2015;280:6-15. https://www.sciencedirect.com/science/article/pii/S0166432814007724?via%3Dihub
PUSPITA N, KURNIAWIDJAJA M, HIKMAT RAMDHAN D. Health Effect Symptoms Due to Heat Stress Among Gong Factory Workers in Bogor, Indonesia. In The 2nd International Meeting of Public Health 2016 with theme “Public Health Perspective of Sustainable Development Goals: The Challenges and Opportunities in Asia-Pacific Region”. KnE Life Sciences 2018;469-475. https://www.knepublishing.com/index.php/Kne-Life/article/view/2308/5104
Vargas N, Marino F. Heat stress, gastrointestinal permeability and interleukin-6 signaling - Implications for exercise performance and fatigue. Temperature (Austin) 2016;3(2):240-251. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4964994/pdf/ktmp-03-02-1179380.pdf
Otani H, Kaya M, Tamaki A, Watson P. Separate and combined effects of exposure to heat stress and mental fatigue on endurance exercise capacity in the heat. Eur J Appl Physiol 2017;117(1):119-129. https://link.springer.com/article/10.1007%2Fs00421-016-3504-x
Robertson CV, Marino FE. Cerebral responses to exercise and the influence of heat stress in human fatigue. J Therm Biol 2017;63:10-15. https://www.sciencedirect.com/science/article/pii/S0306456516301668?via%3Dihub
Best wishes from Germany,
Martin
Elderly or more vulnerable people struggle with thermal sensitivity and regulation. In this population living in hot conditions can lead to many symptoms and more serious issues, and can even be fatal. See work by Ollie Jay's group in Australia on heat waves and work by Kirsty Waldock in UK on heat stress in the elderly.
Most of our work is on severe occupational heat stress, mainly in fire instructors exposed to heat (~200C ~3-4 times per week), which offers a good model to answer your question. These individuals demonstrate long term symptoms of physical and mental fatigue, alongside chronic inflammation and suppressed immune function. Even though they also display physiological adaptation to heat and subsequent improved thermal tolerance.
So yes, if the population is vulnerable (poor thermal control or sensitivity) or the heat stress is too severe, individuals may display symptoms of chronic fatigue.
Dear Seyyed,
Maybe the following papers will help you:
Qian S, Li M, Li G, Liu K, Li B, Jiang Q, Li L, Yang Z, Sun G. Environmental heat stress enhances mental fatigue during sustained attention task performing: evidence from an ASL perfusion study. Behav Brain Res 2015;280:6-15. https://www.sciencedirect.com/science/article/pii/S0166432814007724?via%3Dihub
PUSPITA N, KURNIAWIDJAJA M, HIKMAT RAMDHAN D. Health Effect Symptoms Due to Heat Stress Among Gong Factory Workers in Bogor, Indonesia. In The 2nd International Meeting of Public Health 2016 with theme “Public Health Perspective of Sustainable Development Goals: The Challenges and Opportunities in Asia-Pacific Region”. KnE Life Sciences 2018;469-475. https://www.knepublishing.com/index.php/Kne-Life/article/view/2308/5104
Vargas N, Marino F. Heat stress, gastrointestinal permeability and interleukin-6 signaling - Implications for exercise performance and fatigue. Temperature (Austin) 2016;3(2):240-251. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4964994/pdf/ktmp-03-02-1179380.pdf
Otani H, Kaya M, Tamaki A, Watson P. Separate and combined effects of exposure to heat stress and mental fatigue on endurance exercise capacity in the heat. Eur J Appl Physiol 2017;117(1):119-129. https://link.springer.com/article/10.1007%2Fs00421-016-3504-x
Robertson CV, Marino FE. Cerebral responses to exercise and the influence of heat stress in human fatigue. J Therm Biol 2017;63:10-15. https://www.sciencedirect.com/science/article/pii/S0306456516301668?via%3Dihub
Best wishes from Germany,
Martin
In principle by what was read in:
https://www.mayoclinic.org/es-es/diseases-conditions/chronic-fatigue-syndrome/symptoms-causes/syc-20360490
https://medlineplus.gov/spanish/chronicfatiguesyndrome.html
Among the causes of chronic fatigue syndrome is not exposure to high temperatures. Rather, we talk about sleeping well, eating well or having a low stress environment as the most frequent causes
On the other hand, hyperthermia is caused by an increase in ambient temperature or by the impossibility of eliminating the excess heat produced by muscular work: heat cramps, heat exhaustion, heat stroke.
On the other hand heat-related illnesses occur when the body can no longer transfer the necessary heat to stay cool, in almost all cases it is preventable by taking some care, but in none is accompanied by congenital symptoms, they can be
Heavy sweating, weakness, cold skin, pale, wet and sticky, fast or weak pulse, nausea or vomiting, fainting, high body temperature, loss of consciousness among others ...
Data exists on the physiological responses to heat stress and chronic exposure to heat, however, a paucity of studies examining the psychological response needs review. Chronic heat exposure has a cumulative wear and tear effect on systemic and cellular function and alterations in immunity, digestion, a burdened reproductive system, dysregulation of the HPA-axis, chronic kidney disease of unknown etiology resulting from dehydration, and most concerning is decreased cognitive performance. Could the cumulative wear and tear effect on cognition resulting from chronic heat exposure and heat stress predispose vulnerable populations, like the elderly, to dementia? A recent review: The neurological and cognitive consequences of hyperthermia describes the vulnerability of brain function.
Walter, Edward James, Carraretto, Mike. The neurological and cognitive consequences of hyperthermia. Critical Care. (2016) 20:199
Article The neurological and cognitive consequences of hyperthermia
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