Walking 7,000 steps a day a huge boost to health: research
The most widely promoted target for people tracking their number of steps is 10,000 -- but that figure reportedly originally came from a 1960s marketing campaign for a Japanese pedometer.
To find a more scientific target, an international team of researchers sifted through 57 previous studies that covered 160,000 people.
The results published in the Lancet Public Health journal found that walking 7,000 steps a day nearly halved people's risk of early death from all causes, compared to 2,000 steps.
The study also looked into health problems not previously covered by research into step counts.
Walking 7,000 steps a day was linked to people's risk of dementia falling by 38 percent, depression dropping 22 percent and diabetes decreasing 14 percent.
It was also associated with lower rates of cancer and falls, though the researchers warned this was based on less evidence.
"You don't need to hit 10,000 steps a day to get major health benefits," Paddy Dempsey, a study co-author and medical researcher at Cambridge University, told AFP.
"The biggest gains happen before 7,000 steps, and then benefits tend to level off," he said.
While people's speeds vary widely, 7,000 steps adds up to roughly an hour of walking throughout the day.
Dempsey emphasised that people already managing 10,000 or more steps should keep it up.
But he had a message for people who might find 7,000 steps daunting: "don't be discouraged".
"If you're only getting 2,000–3,000 steps a day, aim to add an extra 1,000 steps. That's just 10–15 minutes of light walking spread across the day," he said.
Andrew Scott, a researcher at the University of Portsmouth not involved in the study, said that "it demonstrates that overall more is always better".
"People should not focus too much on the numbers, particularly on days where activity is limited," he added.
The World Health Organization recommends at least 150 minutes of moderate to intense physical activity a week. Nearly a third of people worldwide do not reach this target, according to the WHO.
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Bangkok Post
4 days ago
- Bangkok Post
Walking 7,000 steps a day a huge boost to health: research
PARIS - People who walk 7,000 steps a day have a dramatically lower risk of a broad range of serious health problems, the largest review of the evidence yet said Thursday. The most widely promoted target for people tracking their number of steps is 10,000 -- but that figure reportedly originally came from a 1960s marketing campaign for a Japanese pedometer. To find a more scientific target, an international team of researchers sifted through 57 previous studies that covered 160,000 people. The results published in the Lancet Public Health journal found that walking 7,000 steps a day nearly halved people's risk of early death from all causes, compared to 2,000 steps. The study also looked into health problems not previously covered by research into step counts. Walking 7,000 steps a day was linked to people's risk of dementia falling by 38 percent, depression dropping 22 percent and diabetes decreasing 14 percent. It was also associated with lower rates of cancer and falls, though the researchers warned this was based on less evidence. "You don't need to hit 10,000 steps a day to get major health benefits," Paddy Dempsey, a study co-author and medical researcher at Cambridge University, told AFP. "The biggest gains happen before 7,000 steps, and then benefits tend to level off," he said. While people's speeds vary widely, 7,000 steps adds up to roughly an hour of walking throughout the day. Dempsey emphasised that people already managing 10,000 or more steps should keep it up. But he had a message for people who might find 7,000 steps daunting: "don't be discouraged". "If you're only getting 2,000–3,000 steps a day, aim to add an extra 1,000 steps. That's just 10–15 minutes of light walking spread across the day," he said. Andrew Scott, a researcher at the University of Portsmouth not involved in the study, said that "it demonstrates that overall more is always better". "People should not focus too much on the numbers, particularly on days where activity is limited," he added. The World Health Organization recommends at least 150 minutes of moderate to intense physical activity a week. Nearly a third of people worldwide do not reach this target, according to the WHO.
Bangkok Post
6 days ago
- Bangkok Post
The eye-opening science of close encounters with polar bears
LONGYEARBYEN - It's a pretty risky business trying to take a blood sample from a polar bear -- one of the most dangerous predators on the planet -- on an Arctic ice floe. First you have to find it and then shoot it with a sedative dart from a helicopter before a vet dares approach on foot to put a GPS collar around its neck. Then the blood has to be taken and a delicate incision made into a layer of fat before it wakes. All this with a wind chill of up to minus 30C. For the last four decades experts from the Norwegian Polar Institute (NPI) have been keeping tabs on the health and movement of polar bears in the Svalbard archipelago, halfway between Norway and the North Pole. Like the rest of the Arctic, global warming has been happening there three to four times faster than elsewhere. But this year the eight scientists working from the Norwegian icebreaker Kronprins Haakon are experimenting with new methods to monitor the world's largest land carnivore, including for the first time tracking the PFAS "forever chemicals" from the other ends of the Earth that finish up in their bodies. An AFP photographer joined them on this year's eye-opening expedition. Delicate surgery on the ice With one foot on the helicopter's landing skid, vet Rolf Arne Olberg put his rifle to his shoulder as a polar bear ran as the aircraft approached. Hit by the dart, the animal slumped gently on its side into a snowdrift, with Olberg checking with his binoculars to make sure he had hit a muscle. If not, the bear could wake prematurely. "We fly in quickly," Oldberg said, and "try to minimise the time we come in close to the bear... so we chase it as little as possible." After a five- to 10-minute wait to make sure it is asleep, the team of scientists land and work quickly and precisely. They place a GPS collar around the bear's neck and replace the battery if the animal already has one. Only females are tracked with the collars because male polar bears -- who can grow to 2.6 metres -- have necks thicker than their heads, and would shake the collar straight off. Olberg then made a precise cut in the bear's skin to insert a heart monitor between a layer of fat and the flesh. "It allows us to record the bear's body temperature and heart rate all year," NPI researcher Marie-Anne Blanchet told AFP, "to see the energy the female bears (wearing the GPS) need to use up as their environment changes." The first five were fitted last year, which means that for the first time experts can cross-reference their data to find out when and how far the bears have to walk and swim to reach their hunting grounds and how long they rest in their lairs. The vet also takes a biopsy of a sliver of fat that allows researchers to test how the animal might stand up to stress and "forever chemicals", the main pollutants found in their bodies. "The idea is to best represent what bears experience in the wild but in a laboratory," said Belgian toxicologist Laura Pirard, who is testing the biopsy method on the mammals. Eating seaweed It has already shown that the diet of Svalbard's 300 or so bears is changing as the polar ice retreats. The first is that they are eating less seals and more food from the land, said Jon Aars, the lead scientist of the NPI's polar bear programme. "They still hunt seals, but they also take eggs and reindeer -- they even eat (sea)grass and things like that, even though it provides them with no energy." But seals remain their essential food source, he said. "Even if they only have three months to hunt, they can obtain about 70% of what they need for the entire year during that period. That's probably why we see they are doing okay and are in good condition" despite the huge melting of the ice. But if warming reduces their seal hunting further, "perhaps they will struggle", he warned. "There are notable changes in their behaviour... but they are doing better than we feared. However, there is a limit, and the future may not be as bright." "The bears have another advantage," said Blanchet, "they live for a long time, learning from experience all their life. That gives a certain capacity to adapt." Success of anti-pollution laws Another encouraging discovery has been the tentative sign of a fall in pollution levels. With some "bears that we have recaptured sometimes six or eight times over the years, we have observed a decrease in pollutant levels," said Finnish ecotoxicologist Heli Routti, who has been working on the programme for 15 years. "This reflects the success of regulations over the past decades." NPI's experts contribute to the Arctic Monitoring and Assessment Programme (AMAP) whose conclusions play a role in framing regulations or bans on pollutants. "The concentration of many pollutants that have been regulated decreased over the past 40 years in Arctic waters," Routti said. "But the variety of pollutants has increased. We are now observing more types of chemical substances" in the bears' blood and fatty tissues. These nearly indestructible PFAS or "forever chemicals" used in countless products like cosmetics and nonstick pans accumulate in the air, soil, water and food. Experts warn that they ultimately end up in the human body, particularly in the blood and tissues of the kidney or liver, raising concerns over toxic effects and links to cancer.
Bangkok Post
16-07-2025
- Bangkok Post
Skimming the Sun, probe sheds light on space weather threats
WASHINGTON - Eruptions of plasma piling atop one another, solar wind streaming out in exquisite detail -- the closest-ever images of our Sun are a gold mine for scientists. Captured by the Parker Solar Probe during its closest approach to our star starting on December 24, 2024, the images were recently released by NASA and are expected to deepen our understanding of space weather and help guard against solar threats to Earth. - A historic achievement – "We have been waiting for this moment since the late Fifties," Nour Rawafi, project scientist for the mission at the Johns Hopkins Applied Physics Laboratory, told AFP. Previous spacecraft have studied the Sun, but from much farther away. Parker was launched in 2018 and is named after the late physicist Eugene Parker, who in 1958 theorized the existence of the solar wind -- a constant stream of electrically charged particles that fan out through the solar system. The probe recently entered its final orbit where its closest approach takes it to just 3.8 million miles from the Sun's surface -- a milestone first achieved on Christmas Eve 2024 and repeated twice since on an 88-day cycle. To put the proximity in perspective: if the distance between Earth and the Sun measured one foot, Parker would be hovering just half an inch away. Its heat shield was engineered to withstand up to 2,500 degrees Fahrenheit (1,370 degrees Celsius) -- but to the team's delight, it has only experienced around 2,000F (1090C) so far, revealing the limits of theoretical modeling. Remarkably, the probe's instruments, just a yard (meter) behind the shield, remain at little more than room temperature. - Staring at the Sun – The spacecraft carries a single imager, the Wide-Field Imager for Solar Probe (WISPR), which captured data as Parker plunged through the Sun's corona, or outer atmosphere. Stitched into a seconds-long video, the new images reveal coronal mass ejections (CMEs) -- massive bursts of charged particles that drive space weather -- in high resolution for the first time. "We had multiple CMEs piling up on top of each other, which is what makes them so special," Rawafi said. "It's really amazing to see that dynamic happening there." Such eruptions triggered the widespread auroras seen across much of the world last May, as the Sun reached the peak of its 11-year cycle. Another striking feature is how the solar wind, flowing from the left of the image, traces a structure called the heliospheric current sheet: an invisible boundary where the Sun's magnetic field flips from north to south. It extends through the solar system in the shape of a twirling skirt and is critical to study, as it governs how solar eruptions propagate and how strongly they can affect Earth. - Why it matters – Space weather can have serious consequences, such as overwhelming power grids, disrupting communications, and threatening satellites. As thousands more satellites enter orbit in the coming years, tracking them and avoiding collisions will become increasingly difficult -- especially during solar disturbances, which can cause spacecraft to drift slightly from their intended orbits. Rawafi is particularly excited about what lies ahead, as the Sun heads toward the minimum of its cycle, expected in five to six years. Historically, some of the most extreme space weather events have occurred during this declining phase -- including the infamous Halloween Solar Storms of 2003, which forced astronauts aboard the International Space Station to shelter in a more shielded area. "Capturing some of these big, huge be a dream," he said. Parker still has far more fuel than engineers initially expected and could continue operating for decades -- until its solar panels degrade to the point where they can no longer generate enough power to keep the spacecraft properly oriented. When its mission does finally end, the probe will slowly disintegrate -- becoming, in Rawafi's words, "part of the solar wind itself."
