Health
Apple Watch to Launch Hypertension Detection Feature Amid Expert Caution
Apple is preparing to roll out a new feature for its smartwatch that it says could help identify millions of people living with undiagnosed high blood pressure. But cardiologists are warning users not to over-rely on the technology, stressing that the alerts should not replace traditional medical assessments.
The new function, which is pending regulatory approval, will use the Apple Watch’s light sensor to analyze how a wearer’s blood vessels respond to their heartbeat. If the system consistently detects patterns associated with hypertension, or chronic high blood pressure, it will issue an alert.
Unlike a conventional blood pressure cuff, the smartwatch will not provide specific readings. Instead, users who receive alerts will be encouraged to monitor their blood pressure with a cuff over a week and consult a doctor with the results. Apple said it expects to identify more than one million cases of previously undiagnosed hypertension in the feature’s first year.
Hypertension is one of the world’s most widespread but often silent health risks. The World Health Organization estimates that around 1.3 billion adults globally have high blood pressure, but nearly half remain unaware of their condition. Left untreated, hypertension significantly increases the likelihood of heart attacks, strokes, and kidney disease.
Apple plans to introduce the feature in more than 150 countries and regions, including the European Union, once approval is granted. It will be available on the Apple Watch Series 9 and later models, including the Apple Watch Ultra 2 running watchOS 26.
Health experts say that while the innovation could raise awareness, it comes with clear limitations. Dr. Felix Mahfoud, chair of the cardiology department at the University Hospital Basel in Switzerland, cautioned that smartwatch alerts should not be mistaken for precise medical measurements.
“I can tell you what it means if we measure your blood pressure in a doctor’s office, in terms of your risk of stroke and other health issues,” Mahfoud said. “But all this is basically unknown for detection by smartwatches. No one should ever base any treatment or management decision on a smartwatch.”
Apple’s own trials, involving over 2,200 participants, highlighted both the promise and the constraints of the feature. The watch demonstrated a sensitivity rate of around 41 percent — meaning it correctly identified less than half of hypertension cases — and a specificity rate of about 92 percent, suggesting a low likelihood of false alarms.
The company has also emphasized that the feature is not suitable for everyone. It will not be recommended for people under 22, pregnant women, or those already diagnosed with hypertension.
Still, experts believe it could play a valuable role in increasing public awareness. “It’s great if we can increase awareness of hypertension, and hopefully these tools will do that,” Mahfoud said.
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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