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Your ability to compete in ultra-endurance events may be determined at birth

Nypost · · 458 words · By Rachel Sacks
Health Risks of Extreme Sports Biological Determinism
open_in_new Read the original article: https://nypost.com/2026/05/03/health/ability-to-compete-in-ultra-endurance-event…

psychologyDetected Techniques

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Loaded Language 80% confidence
Using words with strong emotional connotations to influence an audience.
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Causal Oversimplification 60% confidence
Assuming a single cause for a complex issue.
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Exaggeration / Hyperbole 70% confidence
Overstating facts or claims to create a stronger emotional response.

fact_checkFact-Check Results

9 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

verified Verified 4
info Single Source 2
check_circle Corroborated 2
help Insufficient Evidence 1
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“more than 150,000 North Americans racing ultramarathons (a distance longer than the standard 26.2-mile marathon) last year”
SINGLE SOURCE
The provided web search results for this claim are about grammar and the use of the word 'more' as an adjective/adverb; they contain no information regarding the number of North Americans racing ultramarathons.
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web search NEUTRAL — Apr 26, 2016 · When "more" is used before adjective or adverb as "inconvenient" in your example, it is an adverb whose primary function is to modify the following word. However, when it is used before…
https://ell.stackexchange.com/questions/88401/how-to-use-mor…
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web search NEUTRAL — Dec 22, 2021 · What's the difference between these types of adjective usages? For example: This is more of a prerequisite than a necessary quality. This is more a prerequisite than a necessary quality…
https://ell.stackexchange.com/questions/305628/more-of-a-vs-…
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web search NEUTRAL — To use the correct adjective with the phrase "in detail", think about fewer vs less in number vs amount - but remember "in detail" means specifically or completely already. Examples: I have read your …
https://ell.stackexchange.com/questions/93460/in-more-detail…
verified
“endurance events place a large amount of strain on the kidneys, which could negatively affect their filtration system and lead to cellular damage”
VERIFIED
A source from UVic News explicitly states that ultramarathons place significant strain on the kidneys' filtration system and may lead to cellular damage.
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web search NEUTRAL — Events such as ultramarathons—races exceeding 26.2 miles and often held in high temperatures—place significant strain on the kidneys’ filtration system and may lead to cellular damage.
https://news.uvic.ca/media-release/can-birth-weight-influenc…
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web search NEUTRAL — Even though you probably don't choose to spend a lot of time thinking about it, your pee is kind of a big deal. Today we're talking about the anatomy of your...
https://www.youtube.com/watch?v=l128tW1H5a8
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web search NEUTRAL — Yes — kidney stones can lead to kidney damage or infection if left unmanaged.When stones obstruct urine flow, pressure builds up inside the kidneys, straining tissues and reducing filtration efficienc…
https://luxhospitals.com/blog/urology/can-kidney-stones-lead…
verified
“A study published in Frontiers in Ecology and Evolution has now found a potential link between birth weight and kidney health in ultramarathon athletes”
VERIFIED
Multiple sources confirm a study published in 'Frontiers in Ecology and Evolution' led by Alison Murray investigated the link between birth weight and kidney stress in ultramarathon athletes.
travel_explore
web search NEUTRAL — The study published in Frontiers in Ecology and Evolution, led by University of Victoria biological anthropologist Alison Murray, is the first to investigate a potential link between birth weight and …
https://www.news-medical.net/news/20260430/Study-suggests-bi…
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web search NEUTRAL — Study shows optimal birth weight for minimal kidney damage is approximately eight pounds.UVic researchers found that extreme endurance events place significant stress on the kidneys, with athletes at …
https://surreynowleader.com/2026/05/01/uvic-research-finds-b…
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web search NEUTRAL — Frontiers in Life Science.
https://www.tandfonline.com/doi/full/10.1080/21553769.2016.1…
verified
“44 ultramarathon athletes underwent blood testing to measure kidney function and potential damage before and after their races”
VERIFIED
The evidence from Frontiers mentions that the study tested serum creatinine among 44 ultramarathon athletes, which aligns with the claim about the sample size and the use of blood testing for kidney function.
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web search NEUTRAL — Take online courses on Study.com that are fun and engaging. Pass exams to earn real college credit. Research schools and degrees to further your education.
https://study.com/
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web search NEUTRAL — Need a Study.com Account? Simple & engaging videos to help you learn Unlimited access to 88,000+ lessons The lowest-cost way to earn college credit
https://study.com/academy/login.html
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https://study.com/academy/course/index.html
verified
“The ideal birth weight for minimal damage? 8 pounds. This weight was most likely to reduce the chances of acute kidney injury”
VERIFIED
UVic research results explicitly state that the optimal birth weight for minimal kidney damage is approximately eight pounds.
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web search NEUTRAL — Individuals at either the lower or higher end of the birth weight range may face a greater risk of kidney stress or damage during extreme endurance events.
https://www.news-medical.net/news/20260430/Study-suggests-bi…
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web search NEUTRAL — Athletes with lower or higher birth weights might require tailored approaches to conditioning, hydration, and renal monitoring to mitigate the risk of acute kidney injury during and after extreme endu…
https://bioengineer.org/does-birth-weight-affect-endurance-c…
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web search NEUTRAL — Methods: Here, we test the extent to which birth weight shapes change in serum creatinine, a marker of kidney function, among 44 ultramarathon athletes racing in hot or cold conditions.
https://www.frontiersin.org/journals/ecology-and-evolution/a…
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“During exercise, blood flow is redirected to the muscles and less to the kidneys”
CORROBORATED
Multiple independent sources (Prezi, a general health article, and a quiz site) confirm that during exercise, blood flow is redirected away from organs like the kidneys and toward the working muscles.
travel_explore
web search NEUTRAL — during exercise, blood flow is redirected away from the spleen, kidneys, gastrointestinal tract and inactive muscles to the working muscles.During exercise, the working muscles extract greater amounts…
https://prezi.com/nc2rvbjzrq8m/acute-responses-to-exercise/
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web search NEUTRAL — Blood flow is diverted away from organs that need less during physical activity—like the intestines—and redirected to your muscles. This shift ensures your skeletal muscles receive the oxygen and gluc…
https://www.nationalgeographic.com/science/article/exercise-…
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web search NEUTRAL — Coronary vessels also experience increased blood flow during exercise to supply the heart muscle with more oxygen and nutrients. Kidneys and digestive organs do not typically experience a significant …
https://www.gauthmath.com/solution/1805698970500101/Select-a…
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“Previous studies have shown that ultramarathoners experience a breakdown of normal red blood cells during races, which can lead to anemia and other issues”
CORROBORATED
Multiple sources discuss the damage to red blood cells in extreme endurance running, including 'hardening' of cells and 'footstrike hemolysis' leading to macrocytic anemia.
travel_explore
web search NEUTRAL — Insight into how extreme physical stress affects red blood cells could lead to advancements in blood storage techniques. Angelo D’Alessandro, PhD, another contributor to the study, emphasized the resi…
https://news.ssbcrack.com/study-reveals-extreme-endurance-ru…
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web search NEUTRAL — Reduced Red Blood Cell Flexibility. In the UMTB cohort, the researchers observed significant hardening of red blood cells, which means these cells would have had more difficulty circulating as needed …
https://run.outsideonline.com/nutrition-and-health/ultrarunn…
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web search NEUTRAL — Macrocytic anemia means that a person's red blood cells are abnormally large in size, and, in addition, they do not carry enough oxygen, according to Medscape . Red blood cells help transport oxygen t…
https://www.livescience.com/61270-foot-strike-hemolysis-ultr…
info
“Runners’ red blood cells showed both molecular and physical damage, from the pressure of blood surging through the body during exercise, inflammation and oxidative stress, or low levels of antioxidants”
SINGLE SOURCE
While evidence confirms red blood cells are damaged during endurance runs, the specific list of causes (blood surging pressure, inflammation, oxidative stress, low antioxidants) is not explicitly detailed across multiple independent sources in the provided evidence; the provided results discuss general blood pressure and sickle cell, but not the specific combination for runners.
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web search NEUTRAL — Packed red blood cells are red blood cells that have been donated, processed, and stored in a blood bank for blood transfusion.Affected by Sickle-cell disease, red blood cells alter shape and threaten…
https://en.wikipedia.org/wiki/Red_blood_cell
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web search NEUTRAL — Low Blood Pressure. Muscular Atrophy.Maturing red blood cells can import heme from surrounding cells via the HRG1 transporter after losing their mitochondria, enabling continued hemoglobin synthesis u…
https://medicalxpress.com/news/2026-04-red-blood-cells-hemog…
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web search NEUTRAL — Blood pressure is the force that moves blood through our circulatory system. Dr. Robert Baron explains what the two numbers mean in a reading and when it's t...
https://www.youtube.com/watch?v=j314amPw4RQ
help
“Another study also found that extreme endurance efforts cause the brain to temporarily break down its own insulation to use as an emergency energy source”
INSUFFICIENT EVIDENCE
No evidence was found after searching for the claim regarding the brain breaking down its own insulation during endurance efforts.
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.