Latest news with #hypoxia
News.com.au
28-05-2025
- General
- News.com.au
Paraglider survived being sucked 8.5km into the sky in rare ‘cloud suction'
A shocking video shows the terrifying moment a paraglider was sucked 8.5km into the sky and endured bone-chilling conditions among the clouds. He reportedly became trapped in a rare 'cloud suction' that pulled him more than 8.5km into the air during a flight over China. The paraglider, who miraculously survived the ordeal on Saturday, caught the nerve-shredding moments on camera. His jaw-dropping footage has now gone viral on social media. He took off for his flight from an altitude of around 3,000 metres over the Qilian Mountains according to local media reports. But the paraglider quickly malfunctioned and became uncontrollable, as he was dragged up thousands on feet into the clouds. He was sucked to the sort of heights at which passenger aeroplanes might cruise. The footage lays bare the icy conditions he had to endure, suffering from extensive frostbite at the terrifying altitude. He can be seen clinging onto his parachute for dear life in the frightening conditions. Visibility is initially poor at the start of the clip as the paraglider is sucked to high altitudes over the mountains. But at the peak of the trip, he can be seen dangling over the clouds – visibly freezing cold and covered in frost. He was not wearing an oxygen mask, fully exposing him to the hostile elements. However, the man miraculously remained conscious throughout the ordeal and successfully brought his parachute to a safe landing. He later recalled experiencing hypoxia and having his hands exposed to the blistering cold above the clouds, local media reported. 'I just kept communicating over the radio the entire time,' he said. An experienced paraglider, surnamed Ou, told local media that few people would survive being pulled to such high altitudes. 'This is truly miraculous,' Ou said. 'His mental resilience was extraordinary.' Ou added that paragliders will typically come prepared for such flights with cold weather gear, as it would already be extremely cold at the takeoff altitude. But at 8,000 metres, temperatures can drop to as low as -40, and oxygen supplies would be critically low, Jiupai News reported. The incident is now being investigated by regulatory authorities. A source told Jiupai News that he had failed to file the necessary flight plan – including getting airspace clearance for the launch site. Chinese national aviation sports regulations state that aerial activities need prior airspace approval from air traffic control. Paragliding activities have to be carried out according to a prearranged plan, and trips are prohibited under adverse weather conditions. Changing flight plans without authorisation is also not allowed. Penalties for those found in breach of the rules range from warning and fines to criminal charges, local media reports.
Yahoo
22-05-2025
- Health
- Yahoo
Humans Are Evolving Right in Front of Our Eyes on The Tibetan Plateau
Humans are not yet done cooking. We're continuing to evolve and adjust to the world around us, the records of our adaptations written in our bodies. We know that there are some environments that can make us unwell. Mountain climbers often succumb to altitude sickness – the body's reaction to a significant drop in atmospheric pressure, which means less oxygen is taken in with each breath. And yet, in high altitudes on the Tibetan Plateau, where oxygen levels in the air people breathe are notably lower than lower altitudes, human communities thrive. In the more than 10,000 years the region has been settled, the bodies of those living there have changed in ways that allow the inhabitants to make the most of an atmosphere that for most humans would result in not enough oxygen being delivered via blood cells to the body's tissues, a condition known as hypoxia. "Adaptation to high-altitude hypoxia is fascinating because the stress is severe, experienced equally by everyone at a given altitude, and quantifiable," anthropologist Cynthia Beall of Case Western Reserve University in the US told ScienceAlert. "It is a beautiful example of how and why our species has so much biological variation." Beall has been studying the human response to hypoxic living conditions for years. In research published in October 2024, she and her team unveiled some of the specific adaptations in Tibetan communities: traits that help the blood deliver oxygen. To unlock this discovery, the researchers delved into one of the markers of what we call evolutionary fitness: reproductive success. Women who deliver live babies are those who pass on their traits to the next generation. The traits that maximize an individual's success in a given environment are most likely to be found in women who are able to survive the stresses of pregnancy and childbirth. These women are more likely to give birth to more babies; and those babies, having inherited survivability traits from their mothers, are also more likely to survive to adulthood, and pass the traits on to the next generation. That's natural selection at work, and it can be a bit strange and counterintuitive; in places where malaria is common, for example, the incidence of sickle cell anemia is high, because it involves a gene that protects against malaria. Beall and her team made a study of 417 women between the ages of 46 and 86 years who have lived all their lives in Nepal above altitudes of around 3,500 meters (11,480 feet). The researchers recorded the number of live births, ranging between 0 and 14 per woman for an average of 5.2, as well as health and physical information and measurements. Among the things they measured were levels of hemoglobin, the protein in red blood cells responsible for delivering oxygen to tissues. They also measured how much oxygen was being carried by the hemoglobin. Interestingly, the women who demonstrated the highest rate of live births had hemoglobin levels that were neither high nor low, but average for the testing group. But the oxygen saturation of the hemoglobin was high. Together, the results suggest that the adaptations are able to maximize oxygen delivery to cells and tissues without thickening the blood – a result that would place more stress on the heart as it struggles to pump a higher viscosity fluid more resistant to flow. "Previously we knew that lower hemoglobin was beneficial, now we understand that an intermediate value has the highest benefit. We knew that higher oxygen saturation of hemoglobin was beneficial, now we understand that the higher the saturation the more beneficial. The number of live births quantifies the benefits," Beall said. "It was unexpected to find that women can have many live births with low values of some oxygen transport traits if they have favorable values of other oxygen transport traits." The women with the highest reproductive success rate also had a high rate of blood flow into the lungs, and their hearts had wider than average left ventricles, the chamber of the heart responsible for pumping oxygenated blood into the body. Taken all together, these traits increase the rate of oxygen transport and delivery, enabling the human body to make the most of the low oxygen in the air respired. It's important to note that cultural factors can play a role, too. Women who start reproducing young and have long marriages seem to have a longer exposure to the possibility of pregnancy, which also increases the number of live births, the researchers found. Even taking that into account, however, the physical traits played a role. Nepalese women with physiologies most similar to women in unstressed, low altitude environments tended to have the highest rate of reproductive success. "This is a case of ongoing natural selection," Beall said. "Understanding how populations like these adapt gives us a better grasp of the processes of human evolution." The research was published in the Proceedings of the National Academy of Sciences. An earlier version of this article was published in October 2024. Nanoplastics Stick to Toxic Bacteria, Forming a Deadly Combination Expert Explains FDA's New COVID Vaccine Rules in The US Your Perfume Could Be Messing With Your Chemical Force Shield
