Health
Study Finds Human Blood Cells Age Faster in Space
Human blood cells exposed to space conditions begin to lose their ability to generate healthy new cells and show signs of genetic damage, according to new research backed by NASA. The findings raise concerns about the biological toll of long-duration space travel and its potential impact on astronaut health.
The study, published in Cell Stem Cell, tracked changes in blood-forming stem cells during four SpaceX missions to the International Space Station (ISS). Researchers used haematopoietic stem and progenitor cells (HSPCs), which are crucial for producing blood and maintaining immune function.
When these cells spent 32 to 45 days in space, they began to display hallmarks of accelerated ageing. This included reduced capacity to generate healthy new cells, DNA damage, and shorter telomeres — protective caps on chromosomes that naturally shorten with age.
“Space is the ultimate stress test for the human body,” said Dr. Catriona Jamieson, study co-author and director of the Sanford Stem Cell Institute at the University of California San Diego. “Our findings show that the stressors of space — including microgravity and cosmic radiation — can accelerate the molecular ageing of blood stem cells.”
Using AI to Track Ageing in Space
The team used artificial intelligence-powered imaging tools to monitor cellular changes in real time during the missions. By studying HSPCs in microgravity, they were able to observe how quickly biological deterioration can occur outside Earth’s atmosphere.
Interestingly, some of the damage appeared to reverse when the cells were returned to Earth and placed in healthier environments. This suggests that while space accelerates cellular ageing, certain effects may be at least partially reversible.
Implications for Astronauts and Space Travel
The findings highlight the urgent need to develop countermeasures to protect astronauts as space agencies and private companies push for longer missions to the Moon, Mars, and beyond.
“Understanding these changes not only informs how we protect astronauts during long-duration missions but also helps us model human ageing and diseases like cancer here on Earth,” Jamieson noted.
The next phase of research will investigate whether similar molecular changes occur in astronauts themselves. Scientists hope to identify medical or genetic interventions that could mitigate the harmful effects of prolonged exposure to microgravity and cosmic radiation.
A New Era of Space Medicine
As commercial spaceflight expands and research in low Earth orbit grows, the health risks of space travel are becoming more pressing. The study suggests that prolonged stays in orbit could increase vulnerability to age-related conditions and weaken immune systems, underscoring the need for new medical strategies.
“This is essential knowledge as we enter a new era of commercial space travel,” Jamieson added. “Protecting human health in space will be as important as developing the technology to get us there.”
Health
World Cup Emotion Can Strain the Heart, Cardiologists Warn Fans at Risk
As the World Cup begins, medical experts are cautioning football fans with underlying heart conditions that the emotional intensity of matches can place unexpected strain on the cardiovascular system.
Cardiologists say that the excitement, tension, and anxiety generated during high-stakes games can trigger physical reactions similar to intense exercise, raising heart rate, blood pressure, and stress hormones.
“Intense emotions, whether positive or negative, can act as ‘precipitating risk factors’ for cardiovascular events such as heart attack,” said Paola Santalucia, a cardiologist and board member of the European Heart Network.
She explained that moments of extreme excitement, such as a decisive penalty shootout or a last-minute goal, may pose risks for people already living with heart disease. Those with additional risk factors, including hypertension, obesity, or smoking habits, are also advised to be cautious during emotionally charged matches.
Research using wearable devices has shown that during major football events, some fans experience heart rates climbing as high as 150 beats per minute. That level is comparable to sprinting and reflects how strongly the body reacts to emotional stress.
A study examining supporters during the 2025 German Cup final found that even watching from home can significantly affect physiological responses. “They still had an increase in heart rate that compares to walking, even though they didn’t walk,” said Christian Deutscher, professor of sports economics at Bielefeld University and co-author of the study.
He noted that the most intense reactions often occur not during goals themselves, but during moments of uncertainty such as VAR checks, penalty shootouts, or shots striking the post. These unpredictable situations, he said, are what drive the strongest emotional and physical responses among fans.
Deutscher also pointed out that stadium spectators may experience even greater strain due to environmental factors such as heat and alcohol consumption.
However, experts emphasize that football itself is not inherently dangerous. Instead, it is the body’s natural response to excitement that can create temporary stress.
“The adrenergic stimulation is at its max: extreme high blood pressure, high heart rate, and adrenaline, cortisol, skyrocketing,” said Dan Atar, professor of cardiology at Oslo University Hospital. In rare cases, he added, this surge can contribute to the rupture of arterial plaque in vulnerable individuals, potentially leading to a heart attack.
Atar stressed that such events can occur in everyday situations as well, including physical exertion like shoveling snow. “It is in no way dangerous to watch a football game,” he said. “All this is physiologic. It’s not dangerous to be excited.”
Still, he acknowledged that combining emotional stress with alcohol, heat, and pre-existing conditions can increase risk for some viewers.
Doctors advise those at higher risk to continue prescribed medications, limit alcohol intake, avoid smoking, and watch for warning signs such as chest pain or irregular heartbeat.
“The key message is not to avoid enjoying the match, but to do so with moderation and awareness,” Santalucia said.
Health
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Health
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