This week, the United Kingdom recorded its highest ever June temperature at 36.1 °C in London, feeling like 39 °C. The dangerous heat wave sweeping Western Europe is not only causing physical discomfort but also alarming effects on the brain. According to a 2023 study by Emma Lawrence at the University of Oxford, during heat waves there was a 9.7% increase in hospital admissions for people with mental health conditions. These findings highlight how extreme heat can significantly impact mental health.
Heat Impairs Attention and Focus in Firefighters
Catherine Thompson, a cognitive psychologist at Liverpool Hope University, studied the effects of extreme heat on firefighters. Results show that after just 15 minutes of intense heat exposure, firefighters struggle to maintain concentration and control their attention. Cognitive functions return to normal after about 20 minutes of cooling down, but Thompson notes that the effects of prolonged exposure over days are unknown. This research, detailed in the related article on how heatwaves alter brain function, provides important insights into the mechanisms of cognitive decline induced by heat.
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Suicide Rates Rise Among Youth as Temperatures Increase
Joshua Wortzel, director of the Heat-Mind Lab at Hartford HealthCare in Connecticut, led a study published this week that found a 2.97% increase in suicide rates among US youth aged 15 to 24 for every 1 °C rise in average monthly temperature. This increase is more than double that seen in people over 24. Children and young people appear among the most vulnerable to heat's effects on mental health, and the implications for the future are concerning. Wortzel emphasizes that there are many biological reasons why the brain can be harmed by heat, including alterations in neurotransmitters like serotonin and interference with neural network communication.
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Early-Life Heat Exposure Alters Brain Development
Studies on lab animals have shown that excessive heat can change chemical signals in the brain, increasing serotonin levels and interfering with oxygen delivery to brain cells. Additionally, emerging research suggests that exposure to extreme temperatures during childhood could have long-term consequences on brain development. Infants exposed to extreme heat or cold showed altered white matter by ages 9 to 12, though individual effects remain unclear. As Lawrence explains, children born in 2020 are predicted to experience seven times more heat waves than their grandparents, making adaptation to a warming world urgent. For more, see the related article on how heat alters the brain.
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According to the UK Met Office, average June temperatures in England between 1991 and 2020 were 19 °C. The current dangerous heat wave is causing thousands of deaths across Europe and straining agriculture, infrastructure, and healthcare systems. The scientific community, as reported by MIT Technology Review, is working to understand the underlying mechanisms, but the complexity of studying such effects makes definitive answers difficult. In the meantime, preventive measures like cooling and hydration remain essential to protect mental health during heat waves.
