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Blood donation remains one of the most selfless and altruistic things that a person can do. Despite the myriad advances by drug companies over the years, no drugs have ever been developed that come close to accomplishing what our own blood can do. Consequently, we remain dependent on the generosity of donors who take a half-hour or so to give up a pint of this incredibly valuable, lifesaving fluid.

But that dependence makes the availability of this valuable resource very precarious. In January of 2022, in response to plummeting donations in the face of surging COVID infections as a result of the Omicron surge, the Red Cross issued its first-ever "Blood Crisis" in which the organization desperately appealed for donors to help shore up critically low supplies. Fortunately, the crisis was short-lived as donors responded and blood banks were able to achieve low but sustainable levels in short order.

However, the supply of blood is continuously under threat. Even today, multiple blood banks across the country are reporting shortages, from New Jersey to Kentucky and California. Because blood has a limited shelf life and the demand is unpredictable, any change in the number of donors can dramatically impact supply. At any given time in the United States, as many as one in five medical centers are operating with a one-day supply of blood products, putting patients at significant risk.

So why is blood such an important resource for medical care? Blood is made up of several components and serves many purposes. After donation, whole blood is separated into its component parts so that each can be used for recipients who have specific needs.

Blood donation, explained

Red blood cells containing the oxygen carrying molecule hemoglobin are separated and made into a unit of PRBC-packed red blood cells, so that they can be reconstituted with saline and infused into patients with anemia for any number of reasons. Trauma victims, cancer patients, and patients undergoing major operations are just some examples of the people who benefit from PRBC. Platelets are important for blood clotting and various conditions can drop patient platelet counts dangerously low in which case bleeding can become an issue. Platelet transfusions may be life saving for them. Finally, the protein-rich plasma has many possible roles and can be given to patients with various types of ailments including autoimmune processes like Guillain Barre syndrome or Myasthenia Gravis or more recently, for patients with severe COVID-19-related illness.

Each year, 45 million units of blood are donated at blood banks throughout the western world, according to the American Red Cross. However, these donations are made by 4% only of the population. There are myriad reasons for why more people don't give blood, from fear of needles, to a lack of knowledge of the need and benefits of donating and for some, a perception that donating blood can have detrimental effects such as exposing the donor to the risk of infection (it does not).

But for endurance athletes training for a race, a common concern is how donating blood will affect their ability to train and race. When is is safe to exercise after giving blood and what should you expect as far as your performance?

How does donating blood affect athletic performance?

Endurance athletes have long known that receiving blood transfusions may enhance exercise performance by increasing hemoglobin concentration and allowing for improved oxygen delivery to the cells. So the logic stands that many athletes wonder if donating blood can have the opposite effect: Can lowering hemoglobin concentration by donating blood negatively impact exercise performance? Fortunately, there is a reasonable body of evidence on the subject that can help athletes make an educated decision on this important question.

After a typical blood donation, hemoglobin levels do indeed predictably decrease by an average of 7 percent and remain depressed for at least 14 days after donation. By then, they have recovered by about half, to a 4 percent decrease from pre-donation levels, according to a 2017 study in Transfusion. Hematocrit, or the measure of what percentage of blood volume is made up of red blood cells, also decreases for the first few days after a donation. Hematocrit also decreases by 5 percent 48 hours after donation, recovers within two weeks after the donation. This is because the new cells that have been synthesized in that two-week period contain less hemoglobin than more mature cells. As a result, the hematocrit recovers more quickly than the hemoglobin concentration.

Because hemoglobin is needed for carrying oxygen to tissues in the body, the decrease in hemoglobin seen with blood donation is associated with a decrease in oxygen-carrying capacity and delivery, accounting for a measurable 7 percent decrease in VO2 max in the 24-48 hours after donation. Interestingly, this decrease completely disappears by day three, suggesting that blood volume has re-expanded by that point and increases in heart rate likely compensate for the decreased hemoglobin to restore oxygen delivery to normal. Because VO2 max is a measure of oxygen utilization by peripheral tissues, if oxygen delivery is restored to near-normal levels by the third day after a donation, then it makes sense that VO2 max would recover, as cellular metabolism is unaffected by hemoglobin levels alone.

Along with the decrease in VO2 max, measured maximal exercise capacity as well as time to exhaustion when performing at threshold also decreases by about 10 percent after a blood donation, then fully recovers by one week. Submaximal efforts have never effectively been studied, so no clear conclusions can be made about efforts in that range after blood donation.

Taken together, these findings suggest that blood donation is indeed associated with a measurable decrease in exercise performance, principally at the highest levels of exertion. This effect is maximal for the first two days after a donation, and has disappeared by fourteen days after donation.

When can I exercise after donating blood?

Clearly, blood donation is compatible with endurance training. Athletes need only to incorporate such donations into their schedule so that they do not have high-intensity training for several days to a week after a donation, and certainly should not donate within two weeks of a race.

The satisfaction gained from the knowledge of having helped others in this way should be more than sufficient motivation to arrange one's schedule to make this possible. Please donate and do your part to help save a life.

Ethiopia’s Fotyеn Tesfay Haylu delivered one of the most remarkable women’s half-marathon performances ever seen on American soil on Sunday, powering to a commanding victory at the 2026 Buenos Aires Half Marathon in Argentina in 1:03:57.

Running with exceptional confidence and strength, Tesfay took control of the race and produced a superb solo performance to rewrite the event record. Her breathtaking run also carried historic significance, as she became the first woman to break the 64-minute barrier for the half marathon in the Americas, producing what is being celebrated as the fastest women’s half-marathon performance ever recorded on the continent.

The Ethiopian star was in a class of her own, crossing the finish line more than a minute clear of Turkey’s Nevin Can, who finished second in 1:05:06. Another Turkish athlete, Selin Can, completed the podium in third place with 1:05:11, as the leading trio all produced strong performances on the fast streets of Buenos Aires.

Kenya also featured prominently in the top positions, with Irene Jepchumba Kimais taking fourth in 1:06:04, followed by Sheila Chepkirui in fifth with 1:06:13. Magaret Akidor Ngathike finished sixth in 1:06:46, while fellow Kenyan Deborah Samum claimed seventh place in 1:08:32.

Brazil’s Nubia de Oliveira Silva was eighth in 1:11:13, while Argentina’s Sofia Luna and Dahyana Juarez rounded out the top 10 with times of 1:11:21 and 1:11:28, respectively.

Top 10 Women – 2026 Buenos Aires Half Marathon

1. Fotyеn Tesfay Haylu (Ethiopia) – 1:03:57

2. Nevin Can (Turkey) – 1:05:06

3. Selin Can (Turkey) – 1:05:11

4. Irene Jepchumba Kimais (Kenya) – 1:06:04

5. Sheila Chepkirui (Kenya) – 1:06:13

6. Magaret Akidor Ngathike (Kenya) – 1:06:46

7. Deborah Samum (Kenya) – 1:08:32

8. Nubia de Oliveira Silva (Brazil) – 1:11:13

9. Sofia Luna (Argentina) – 1:11:21

10. Dahyana Juarez (Argentina) – 1:11:28

For Tesfay, it was far more than a race victory. Her 1:03:57 performance was a statement of extraordinary quality, combining speed, endurance and remarkable solo running to produce a landmark result in Buenos Aires. In a race that will be remembered for years to come, the Ethiopian did not simply win—she redefined what was thought possible for women’s half-marathon running in the Americas.

Ethiopia’s Yomif Kejelcha produced one of the most extraordinary performances in road racing history on the streets of Buenos Aires, Argentina, reclaiming the half marathon world record with a sensational 56:51 performance at the 2026 Buenos Aires Half Marathon.

The former world record-holder delivered a breathtaking exhibition of speed and endurance to take 29 seconds off the previous pending mark of 57:20, set by Uganda’s Jacob Kiplimo and takes a huge chunk from his own former official world record. Kejelcha's new performance is pending the standard ratification procedures, but if officially ratified, it will return the world record to the Ethiopian star and mark another remarkable chapter in the evolution of the event. 

Kejelcha's achievement is particularly significant because the 57-minute barrier had already been broken before. Jacob Kiplimo had previously run under 57 minutes, clocking 56:42 that was not ratified demonstrating that the once-unthinkable barrier was possible. Kejelcha, however, has become the second man to run under 57-minute barrier who now returns to the top of the all-time rankings with another historic performance in Buenos Aires.

The Ethiopian's race was remarkable not only for the final time but also for the way he built his performance. He covered the opening five kilometres in 13:44 before reaching 10km in 27:18. Rather than slowing, Kejelcha accelerated through the middle stages, passing 15km in 40:39 and 20km in 54:02 as he continued to push the limits of elite road racing.

By the time he reached the finish line, Kejelcha had completed the race at an extraordinary average pace of approximately 2:42 per kilometre, producing one of the most astonishing sustained efforts ever witnessed in distance running. His stunning run sent a powerful message to the athletics world and further strengthened his status as one of the most formidable distance runners of his generation.

Behind the record-breaking champion, Ethiopia completed a dominant clean sweep of the men's podium. Tadese Worku Gebresilase claimed second place in 59:18, while Bereket Nega Batebo secured third in 1:00:17, giving Ethiopia a memorable one-two-three finish in the Argentine capital.

Kenya’s Jonathan Kipkoech Kamosong finished fourth in 1:00:20, followed by compatriot Simon Maywa in fifth with 1:00:55. Argentina’s Ignacio Erario gave the home supporters plenty to celebrate with an impressive sixth-place finish in 1:00:57, breaking the one-hour barrier in front of an enthusiastic local crowd.

Dillon Kipyeko of Kenya finished seventh in 1:01:07, with Robert Kiprop Koech eighth in 1:02:01. Mexico’s Julio Ortiz Ponce took ninth place in 1:03:17, while Colombia’s Jimmy Gómez completed the top 10 in 1:03:34.

The Buenos Aires Half Marathon will now take its place in the history books as the scene of a truly extraordinary breakthrough. For Kejelcha, this was more than just another victory. It was a spectacular return to the top, reclaiming a world record he had previously held and once again rewriting the limits of the half marathon.

The 56:51 performance remains pending ratification, but Yomif Kejelcha's run has already delivered one of the defining moments in the history of road racing.

Kenya delivered another commanding display of distance-running excellence at the Antrim Coast Half Marathon, with Isaia Lasoi leading a memorable Kenyan clean sweep of the men's podium in a race packed with world-class performances.

Lasoi emerged victorious after a thrilling battle at the front, crossing the finish line in a superb 58:26 setting a new course record. His winning performance underlined his strength and speed over the half-marathon distance, but he was made to work all the way by fellow Kenyan Daniel Mateiko, who finished just three seconds behind in 58:29 after an electrifying duel for the title.

The contest between the two leaders produced one of the standout moments of the race, with both athletes pushing deep into elite territory as they fought for victory. In the end, Lasoi found just enough to secure the win, while Mateiko's narrow defeat highlighted the remarkable depth and quality of Kenya's leading distance runners.

Vincent Kipkorir completed the Kenyan sweep, taking third place in 1:00:38 to ensure that all three places on the podium belonged to Kenyan athletes. Samwel Chebolei added further Kenyan strength to the results, finishing fourth in 1:01:01, while Amos Langat was also among the leading finishers.

The international field featured several prominent names. Australia's Jimmy Whelan produced a strong run, while Ethiopia's Yismaw Dillu featured among the front group. American marathon star Galen Rupp also delivered a notable performance, clocking 1:01:29 in another competitive outing for the experienced distance runner. Former world-class track and road athlete Edward Cheserek was also among the top finishers.

Lasoi's 58:26 victory, however, was the defining performance of the day. Together with Mateiko and Kipkorir, he gave Kenya a perfect podium and another emphatic reminder of the country's extraordinary strength in elite road running.

The Antrim Coast Half Marathon once again provided a fast, competitive stage for some of the world's finest distance runners, but when the decisive moments arrived, it was Kenya that owned the podium.

One of the most iconic milestones in the history of ultramarathon running is drawing closer, with entries for the historic 100th edition of the Comrades Marathon set to open on Tuesday, 25 August 2026.

The Comrades Marathon Association has officially announced a detailed entry process for the 2027 race, which will unfold in three stages and give runners around the world the opportunity to secure their place in what promises to be one of the most significant editions ever held of The Ultimate Human Race.

The announcement followed the official launch of the 2027 Comrades Marathon on Wednesday, 19 August, when the centenary campaign, “The Greatest Story Ever Run,” was unveiled alongside a special logo created exclusively for the landmark 100th edition.

The launch also revealed several major highlights for the Centenary Race. The historic event will take place on Sunday, 13 June 2027, and will be a Down Run, with 28,000 places available. The entry process will include a ballot, while the race will offer a record R8.919 million in prize money. Organisers have also set an ambitious goal of raising R10 million for the Amabeadibeadi charities, adding an important charitable dimension to the centenary celebrations. One of the defining moments of the launch was the unveiling of the special Centenary mark, created to commemorate this extraordinary milestone in the history of the race.

The entry process begins on 25 August at 10:00 a.m. SAST, when entries open for Green Number runners, Yellow Number runners and Amabeadibeadi charity entrants.

The next phase follows on 2 September at 10:00 a.m. SAST, when entries open for Comrades Marathon Association members. This window will remain open for 72 hours or until the available entry allocation is filled, with places offered on a strictly first-come, first-served basis.

For general entrants, the process will move to a ballot system. General entries open on 9 September at 10:00 a.m. SAST, with runners able to enter the ballot until it closes on 22 September at 4:30 p.m. SAST. The ballot draw is then scheduled to take place on 23 September.

Several other crucial dates will shape the road to the historic race. The substitution period will run from 15 to 31 March 2027, while 3 May 2027 is the final deadline for runners to submit their qualifying performances, seeding information and other required entry details.

To qualify for the 2027 Comrades Marathon, runners must complete a 42.2km marathon in under five hours between 15 June 2026 and 3 May 2027.

The journey will finally culminate on Sunday, 13 June 2027, when thousands of runners are expected to line up for the historic 100th edition of the Comrades Marathon.

The 2027 race will represent a remarkable moment for the legendary South African ultramarathon. For more than a century, the Comrades Marathon has captured the imagination of runners and spectators with its extraordinary test of endurance, determination and human spirit. Its centenary edition will celebrate the generations of athletes who have faced its demanding roads, conquered its challenges and helped build one of the world's most respected endurance events.

For runners dreaming of becoming part of this historic occasion, the road to Comrades 2027 is now clearly marked. From the opening of entries in August 2026 to race day in June 2027, every deadline will matter.

The Greatest Story Ever Run is preparing for its most historic chapter yet.

American sprint standout Sam Blaskowski is taking steps toward an international future with Poland after uncovering a powerful connection to his family's ancestral homeland.

The 23-year-old sprinter, who has established himself as one of the fastest Americans of his generation with a personal best of 9.89 seconds in the 100 metres, has begun the process of obtaining Polish citizenship with the aim of eventually representing Poland in international competition.

Blaskowski's connection to the country traces back through his great-grandparents, Franciszek and Julian Błaszkowski, who emigrated from Poland to the United States in 1905. Their journey more than a century ago has now opened an unexpected new chapter for their descendant, whose athletic ambitions could soon carry the Błaszkowski name back onto the international stage under Polish colours.

The sprinter has already received support from the Polish Athletics Association as he works through the citizenship and eligibility process. Should his transfer of allegiance be completed, Blaskowski could become a significant addition to Poland's sprint programme.

His credentials certainly make the prospect an exciting one. In addition to his sub-10-second speed over 100 metres, Blaskowski owns a personal best of 19.93 seconds in the 200 metres, demonstrating the kind of versatility that could prove valuable both individually and in Poland's 4x100m relay squad.

For Blaskowski, however, the move is about more than simply changing national colours. It represents an opportunity to reconnect with his family's heritage while pursuing his ambitions at the highest level of the sport.

With his sights set on becoming part of Poland's international sprint team and competing for relay medals, Blaskowski's journey from discovering his Polish roots to potentially representing the country of his ancestors could become one of the most fascinating allegiance stories in world athletics.

A century after Franciszek and Julian Błaszkowski left Poland for America, their family's story may now be coming full circle—this time at full sprint.