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A new study from researchers at the Federal University of São Paulo in Brazil focused on women's aerobic capacity suggests that the mechanisms of VO2 max decline—and thus perhaps the best countermeasures—are different in men and women.Maximal oxygen uptake, or VO2 max, is perhaps the single best predictor of long-term health and longevity. It’s also the key trait that distinguishes elite endurance athletes. We know all this from more than a century of research… in men. Whether the same things hold true for VO2 max in women is less clear, because there simply isn’t as much data on them.

A new study from researchers at the Federal University of São Paulo in Brazil aims to fill some of this gap. They recruited 85 runners and 62 sedentary people, all women between the ages of 20 and 70, and split them further into younger (less than 50) and older (greater than 50) age groups. Then they tested their VO2 max with a progressive treadmill test to exhaustion, measured their body composition with a DXA scan, and collected information about their training and other health-related habits. The results are published (and free to read) in Experimental Gerontology.

The headline findings are unsurprising: runners had higher VO2 max than non-runners, meaning they were able to suck in, distribute to their muscles, and use more oxygen per minute; younger people had higher VO2 max than older people. But when you zoom in on the details, some more interesting patterns emerge.What the VO2 Max Data Shows

There are three ways of expressing VO2 max. The first is absolute VO2 max, which is simply the greatest volume of oxygen you can use per minute, usually expressed in liters per minute. If you get fitter, you’ll be able to deliver and use oxygen more quickly, enabling you to power your exercise on sustainable aerobic metabolism for longer. Conversely, if you get too unfit and your VO2 max drops too low, even simple daily activities like climbing the stairs will require more oxygen than you can supply, turning them into challenging anaerobic efforts.

Here’s how the absoluteVO2 max values compared for the four groups, with runners represented by circles and sedentary people by squares:All this means that absolute VO2 max is a useful marker of health and performance—but it’s less useful for comparison between different people, because the amount of oxygen you use depends on body size. A heavyweight rower might use twice as much oxygen as a diminutive marathoner, but if she’s twice as big then she’s not necessarily fitter. Instead, she’ll need all that extra oxygen to move her larger body around. A better comparison would be to divide each person’s VO2 max by their weight, giving what’s called relative VO2 max, expressed in milliliters of oxygen per kilogram of body weight. Here’s what that data looks like:The key thing to notice here is that there’s a much bigger gap between the runners and non-runners in relative VO2 max than in absolute VO2 max, which is because the non-runners weigh substantially more on average. The relative value offers a much better reflection of how much fitter the runners are for running: what matters is not just how much aerobic power you can deliver, but how big a load that power needs to move.

Why Body Composition Matters, Too

The researchers also present a less-common third way of expressing VO2 max. In this case, they divided the absolute value not by total weight, but by the weight of each person’s lean mass, meaning primarily muscle as well as connective tissue.

To understand why this is relevant, it’s useful to think about VO2 max in terms of oxygen supply and demand. The traditional view of VO2 max was that it was dictated by oxygen supply—that is, by how quickly you could suck in oxygen, diffuse it from your lungs to bloodstream, and pump it to your muscles. These are all considered “central” limitations on VO2 max. The primary way changing VO2 max, in this picture, is for your heart to get stronger so that it can pump more blood to your muscles.

But oxygen demand also matters. It doesn’t matter how much oxygen you pump to your muscles if your muscles aren’t capable of extracting and, with the help of mitochondria, making use of it to provide aerobic energy. That’s why VO2 max is more closely proportional to your total muscle mass than to your overall weight. If you add ten pounds of fat to your body, your absolute VO2 max won’t change because fat doesn’t consume oxygen. If you add ten pounds of muscle, your ability to consume oxygen will increase, and your ability to supply oxygen will likely follow suit. How much muscle you have, and how effectively that muscle can use oxygen, are “peripheral” limitations on VO2 max.

Here’s what the data showed for VO2 max divided by lean mass only:An Unexpected Finding About VO2 Max in Women

Here’s where the surprise comes in. Based on earlier data from men, the researchers had hypothesized that these relative-to-muscle values would be less affected by aging than the relative-to-whole-body values. To put it another way, the male data had suggested that age-related declines in VO2max were primarily related to declines in central factors like the heart and circulatory system, while peripheral factors like the ability of muscle to use oxygen stayed relatively constant. But that’s not what they found here: both central and peripheral factors seemed to decline at similar rates in women.

Why should VO2-max declines in women be different than in men? One possibility is that it’s a fluke that’s specific to the relatively small group of women being tested here. But it’s also possible that there’s a genuine difference. The researchers suggest that “intramuscular adipose tissue”—that is, small amounts of fat located within the muscle itself, sometimes referred to as muscle fat infiltration—may play a role. This infiltration tends to be higher in women, and increases with age. If that’s what’s happening, then it suggests that the mechanisms of VO2 max decline—and thus perhaps the best countermeasures—are different in men and women.

There’s one final point to note in this data—one that, in this case, does echo previous findings in men. The runners experienced a steeper VO2 max decline with age than the non-runners. This might be a sort of physiological regression to the mean: the higher you start, the more you’re likely to fall. But it probably also reflects the fact that older runners tend to train less than younger ones, a pattern that showed up in this study too. There are plenty of good reasons for that, but it’s also a reminder: if you’re working hard to be super-fit now, you’ll have to keep working similarly hard to be similarly fit in the future. When it comes to fitness, saving for retirement only takes you so far.

The prospect of seeing one of athletics' biggest stars back on the track is growing stronger, with Jakob Ingebrigtsen reportedly targeting a return to competition later this summer following his recovery from Achilles tendon surgery.

According to comments made by his agent, Daniel Wessfeldt, in an interview with Norwegian media, the double Olympic champion could make his long-awaited comeback at one of three major European meetings in July. The leading options under consideration are the Monaco Diamond League on July 10, the Hungarian Athletics Grand Prix on July 14, and the London Diamond League on July 18.

For athletics fans, the possibility of Ingebrigtsen lining up in London would add another layer of excitement to an already highly anticipated Diamond League meeting. The Norwegian middle-distance sensation has become one of the sport's most dominant figures in recent years, collecting Olympic, world and European titles while consistently rewriting record books.

His 2026 campaign was put on hold after he underwent surgery on his Achilles tendon earlier this year, forcing him to focus on rehabilitation rather than competition. Since then, questions have surrounded when the 24-year-old would be ready to return to racing.

The latest update suggests that decision will largely depend on how his training progresses over the coming weeks. If recovery continues according to plan, July could mark the beginning of his return to elite competition ahead of the latter stages of the season.

A comeback at either Monaco, Budapest or London would immediately place Ingebrigtsen back among the sport's biggest storylines. Each meeting is renowned for producing world-class performances, and any appearance by the Norwegian would attract significant attention from fans eager to see how quickly he can regain top form after his injury setback.

While no final decision has been confirmed, the signs are increasingly positive. After months away from competition, Jakob Ingebrigtsen appears to be edging closer to a return, with London's Diamond League meeting emerging as one of the most intriguing possibilities on his road back to the track.

Should his recovery continue smoothly, athletics could soon welcome back one of its brightest and most influential stars.

What should have been the defining moment of Emad Bashir-Mohammed's young running career instead turned into one of the most talked-about controversies in American road racing this year.

The 23-year-old crossed the finish line first in the men's citizen's race at the prestigious Bolder Boulder 10K on Memorial Day in Colorado, stopping the clock at an impressive 29:50. His performance was not only a commanding victory but also one of the fastest winning times ever recorded in the event's long and celebrated history. Bashir-Mohammed finished eight seconds clear of his nearest challenger and appeared to have secured a breakthrough triumph.

For nearly two hours, he was the undisputed winner.

Then everything changed.

Race officials announced that Bashir-Mohammed had been disqualified after determining that he had started in the wrong wave. According to Bolder Boulder regulations, he had been assigned to the AA wave but lined up with the faster A wave, which began earlier. Event rules allow runners to move backward into a slower wave, but prohibit athletes from advancing into a faster one.

As a result, Bashir-Mohammed's victory was erased from the record books.

The citizen's title was subsequently awarded to Nickolas Scudder, who crossed the line second in 29:58. The promotion handed Scudder back-to-back citizen's race victories, while Bashir-Mohammed was left to grapple with the disappointment of losing a win he believed he had earned on the road.

The disqualification has since ignited widespread debate across the running community.

Bashir-Mohammed maintains that he did not intentionally violate the rules. He claims that after collecting his AA bib, he spoke with race personnel and was permitted to start with the A wave after presenting evidence of his recent performances. In a statement shared after the race, he expressed frustration over the decision, arguing that his goal was simply to compete against the strongest field available and produce the fastest time possible.

Race organizers, however, stood firmly behind their ruling. Officials stated that wave-assignment regulations are clearly communicated in pre-race information and reiterated during packet collection. They also noted that hundreds of participants are disqualified each year for moving into faster start groups, emphasizing that consistent enforcement is necessary to maintain fairness for all competitors.

The incident has divided opinion among runners and fans alike. Some believe the rules must be applied equally regardless of an athlete's finishing position, arguing that wave assignments are a fundamental part of race organization. Others feel the punishment is harsh, particularly if Bashir-Mohammed genuinely received approval to move up before the start.

What remains undisputed is the quality of his performance. On the roads of Boulder, Bashir-Mohammed demonstrated the fitness and speed required to outrun the field by a significant margin. Yet in road racing, crossing the finish line first is only part of the equation. Compliance with race regulations carries equal weight.

For Bashir-Mohammed, the day will be remembered as a painful lesson in the fine margins that can define elite competition. A remarkable run delivered a memorable victory, but a dispute over wave placement ultimately overshadowed the achievement, leaving behind a controversy that continues to fuel discussion throughout the running world.

A fast race, a costly administrative error, and a debate that may linger long after the finish-line tape has been packed away.

The men's 100 metres at the 2026 Rome Diamond League is shaping up to be one of the most anticipated sprint races of the season, with an exceptional field featuring some of the fastest men in the world.

Scheduled for Thursday, June 4, at the iconic Stadio Olimpico in Rome, the race will bring together reigning stars, established champions and emerging talents in a contest that promises fireworks from the moment the gun goes off.

Kenya's Ferdinand Omanyala headlines a world-class lineup that includes American sprint sensation Noah Lyles, Botswana's Olympic champion Letsile Tebogo, Jamaica's explosive Ackeem Blake, South Africa's ever-consistent Akani Simbine and Italy's hometown hero Lamont Marcell Jacobs. With personal bests ranging from 9.77 to 9.97 seconds, the field is packed with athletes capable of producing something special on the Diamond League stage.

Omanyala, the African record holder with a blistering personal best of 9.77 seconds, arrives in Rome eager to continue his strong early-season form and prove he can challenge the very best on the global circuit. The Kenyan star has built a reputation as one of the fastest starters in world sprinting and will be looking to make a statement against an elite field.

Standing in his way is world champion Noah Lyles, whose personal best of 9.79 seconds places him among the fastest athletes in history. The American remains one of the sport's biggest attractions and will be determined to add another Diamond League victory to his impressive résumé.

The race also marks a major test for Olympic champion Letsile Tebogo. The Botswanan star has rapidly become one of athletics' most exciting talents, while Ackeem Blake continues to establish himself as a serious contender on the international sprint scene.

Adding further intrigue is the presence of Italy's Lamont Marcell Jacobs. Competing on home soil, the Tokyo Olympic champion will enjoy passionate local support as he seeks to deliver a memorable performance in front of the Roman crowd.

South Africa's Akani Simbine, Cameroon's Emmanuel Eseme, Great Britain's Jeremiah Azu and rising American talent Jordan Anthony complete a field that boasts remarkable depth and quality.

Men's 100m Entry List – Rome Diamond League 2026

Ferdinand Omanyala (Kenya) – PB: 9.77

Noah Lyles (USA) – PB: 9.79

Lamont Marcell Jacobs (Italy) – PB: 9.80

Akani Simbine (South Africa) – PB: 9.82

Letsile Tebogo (Botswana) – PB: 9.86

Ackeem Blake (Jamaica) – PB: 9.88

Jordan Anthony (USA) – PB: 9.91

Emmanuel Eseme (Cameroon) – PB: 9.96

Jeremiah Azu (Great Britain) – PB: 9.97

With multiple national record holders, global champions and Olympic medal contenders sharing the same start line, the Rome Diamond League men's 100m could deliver one of the fastest races of the year. For sprint fans around the world, all eyes will be on Rome as a stellar cast battles for supremacy over athletics' blue-riband distance.

Audrey Werro announced her arrival as one of the early stars of the 2026 outdoor season with a commanding victory in the women’s 800 metres at the Rabat Diamond League, producing a performance that exceeded even her own expectations.

The Swiss middle-distance talent surged to victory in a brilliant 1:56.56, breaking the meeting record and delivering one of the fastest times recorded worldwide this season. In a race packed with quality, Werro displayed exceptional composure, confidence, and finishing strength to separate herself from the field and stamp her authority on the event.

What made the performance even more remarkable was the athlete's surprise at the level she had already reached so early in the campaign.

"I was not expecting such a strong start to the season," Werro admitted after the race.

The race unfolded at a relentless pace, but Werro remained perfectly positioned throughout. As the athletes approached the bell lap, she glanced at the clock and immediately sensed something special was within reach.

"When I saw the time at the bell, I felt really confident," she said. "I'm really happy with the Meeting Record and looking forward to the rest of the season."

Her confidence proved justified. Maintaining her rhythm over the final 400 metres, Werro powered down the home straight to secure the victory and rewrite the Rabat meeting record books in the process.

The performance sends an early warning to her rivals ahead of a season that promises major championships and high-profile Diamond League battles. Beyond the record-breaking time, Werro's display highlighted her growing maturity as a racer, combining tactical awareness with impressive speed and endurance.

With the outdoor season only beginning, the 1:56.56 clocking suggests that even faster times could be on the horizon. If Rabat is any indication, Audrey Werro may be poised for the biggest season of her career.

Her emphatic victory in Morocco was more than just another Diamond League win—it was a statement of intent from an athlete determined to challenge the world's best throughout 2026.

The city of Boston is set to welcome back one of its most celebrated champions as Kenya’s Sharon Lokedi headlines a world-class field for the 2026 B.A.A. 10K presented by Mass General Brigham Cancer Institute on June 21.

Fresh from another remarkable victory at the Boston Marathon in April, Lokedi returns to the streets of Boston and Cambridge carrying both momentum and confidence as she aims to defend the title she captured in dominant fashion last year.

The two-time Boston Marathon champion has developed a special connection with the historic race city. In 2025, she produced a course-record performance of 2:17:22 to win the Boston Marathon before returning this year to claim another victory in 2:18:51, the second-fastest winning time in the event’s storied history. Her success has cemented her status as one of the premier road runners in the world.

Lokedi will be making her first competitive appearance since her marathon triumph and arrives as the reigning B.A.A. 10K champion after clocking 31:39 over the challenging 6.2-mile course in 2025.

“Boston has become a very special place for me,” Lokedi said ahead of the race. “The atmosphere created by the fans and the community is unlike anywhere else. I’m excited to return and give everything I have to defend my title.”

The women’s race promises to be highly competitive. American Olympian Rachel Smith, who finished second at the Boston 5K in April, leads the domestic challenge. Kenya’s strong contingent includes African 10,000m champion Gladys Kwamboka, former B.A.A. 10K runner-up Stacy Ndiwa, and experienced road racer Viola Cheptoo. British Olympian Jessica Warner-Judd adds further international depth to a field packed with proven performers.

The men’s race is equally impressive, featuring elite athletes from 13 nations.

Ethiopia’s Dawit Seare enters as one of the leading contenders after capturing the 2025 Boston 5K title and bringing the fastest 10K personal best in the field at 27:21. Kenya will be represented by an accomplished group led by Alexander Mutiso, winner of the 2024 London Marathon and runner-up at last year’s New York City Marathon.

Patrick Kiprop also arrives in outstanding form after securing victory at the prestigious BolderBoulder 10K on Memorial Day, while Alex Masai returns looking to continue his strong record in Boston. Masai recently finished ninth at the Boston Marathon and has earned three top-ten finishes at the B.A.A. 10K.

Among the international stars making their mark is South Africa’s Adriaan Wildschutt, who makes his race debut after an impressive season highlighted by victory at the NYC Half Marathon in 59:30. Ethiopia’s Olympic bronze medallist Hagos Gebrhiwet adds further quality to the field, bringing a wealth of championship experience and previous success in Boston.

Canadian national 10K champion Andrew Alexander, two-time U.S. Olympian Hillary Bor, marathon standout Ryan Ford, and reigning USA 25K champion Andrew Colley complete a field stacked with talent and depth.

With defending champions, Olympic finalists, national champions and rising stars all converging on Boston, the 2026 B.A.A. 10K is shaping up to be one of the most competitive editions in recent memory. For Sharon Lokedi, however, the mission is simple: return to the city where she has repeatedly excelled and add another memorable chapter to her growing Boston legacy.