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Exercice, sportifs et vieillissement

Science de la performance, adaptation cardiaque chez les athlètes, records du monde de Peter et horloge du vieillissement cardiovasculaire.

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Découvrez pourquoi le risque de maladie cardiaque s'accélère avec l'âge. Apprenez comment la rigidification artérielle, les cellules zombies et le cholestérol cumulé impactent votre cœur.
Learn about the causes, risk factors, and screening of sudden cardiac death in young athletes. Discover how rapid AED use and emergency plans save lives.
Can extreme fitness hide heart disease? Discover why lifelong endurance athletes develop silent coronary plaque and why lowering ApoB may protect them
If you are a competitive endurance athlete over the age of 65, you are likely living through a frustrating biological mystery. You still have the drive. You are still putting in the long miles on your bike or hitting the trail for your morning run. But despite your hard work, your body seems to be changing in ways that don't feel fair.
Pendant longtemps, la plupart des gens ont cru que la seule façon d'aider leur cœur était de faire du " cardio ". On nous disait d'aller faire des marches, de courir sur des tapis de course ou de faire du vélo. Ce sont d'excellentes habitudes, mais elles ne racontent qu'une partie de l'histoire. Pensez à votre corps comme à une voiture. Faire de l'exercice aérobique (du cardio) revient à laver la voiture et à garder la peinture brillante. Elle a fière allure et cela aide la voiture à durer, mais si vous n'ouvrez jamais le capot pour vérifier le moteur, la voiture ne roulera pas éternellement.
Imagine a high-end sports car. It is sleek, shiny, and built to win the toughest races. On the outside, it looks perfect. People stop and stare when it drives by because it looks like it could go 200 miles per hour. But deep inside the engine, there is a hidden problem. The fuel line - the pipe that carries gas to the engine - is almost completely plugged with gunk. The car can still drive, but it cannot reach its top speed. If that gunk keeps building up, the engine will eventually stop working altogether.
Imagine you are running on your favorite trail. You are breathing hard, and your legs feel heavy. Suddenly, a runner with gray hair and a steady stride zips right past you. They look like they could keep that pace all day. It is a common sight today - "master athletes" in their 60s and 70s who are faster and fitter than people half their age.
Imagine a high-end sports car. It is sleek, shiny, and built to handle the toughest races. On the outside, it looks absolutely perfect. But deep inside the engine, there is a tiny fuel line that has started to rust. Normally, a "check engine" light would flash on the dashboard to warn the driver that something is wrong. However, in this car, someone has placed a thick piece of black tape over the light. The driver keeps pushing the car to its limits, feeling invincible, totally unaware that the engine is struggling. Suddenly - at 100 miles per hour - the engine stalls.
In this interview, an elite cyclist and PhD-trained researcher shares the story of discovering severe coronary artery disease despite appearing exceptionally healthy. What began as a small drop in cycling power led to an invasive angiogram, a stent, and the discovery of multiple arterial blockages.
Beaucoup de gens ressentent une peur profonde lorsqu'ils entendent les mots " artères obstruées ". Nous pensons souvent à notre cœur comme à la plomberie d'une vieille maison. Nous imaginons qu'avec le temps, les tuyaux se remplissent d'une boue épaisse. Dans cette vision simpliste, si les tuyaux sont propres, vous êtes en bonne santé. Si les tuyaux sont pleins de boue, vous êtes dans de beaux draps. Nous supposons que les personnes qui font beaucoup d'exercice auront les tuyaux les plus propres de tous.
Imagine your body is a giant, bustling city. For the city to work, it needs one massive main water pipe to carry energy and supplies to every single house. In your body, that "water main" is a giant tube called the aorta. Doctors call it the "Great Vessel" because it is the biggest and most important power line in your system.
For decades, doctors and runners shared a comfortable belief: if you ran marathons, your heart was bulletproof. This was known as the "Bassler hypothesis," the idea that finishing a 26-mile race gave you a "get out of jail free" card against heart disease. However, as modern heart scans improved, doctors were met with a shock. The very people who were the fittest on the planet—lifelong marathoners and cyclists—often showed more "rust" or buildup in their heart pipes (arteries) than people who sat on the couch.
La plupart des gens pensent qu'il existe un régime idéal pour vivre longtemps. Mais de nouvelles données scientifiques suggèrent quelque chose de bien plus intéressant : les règles d'une alimentation saine changent en réalité à mesure que nous vieillissons. Ce qui vous protège à 45 ans ne vous protégera peut-être pas à 85 ans. La longévité ne consiste pas à s'en tenir au même plan nutritionnel pour toujours, mais à s'adapter à l'évolution de la biologie de votre corps. Et selon de nouvelles recherches, l'âge de 65 ans semble être un tournant majeur.
Le déclencheur : Déconditionnement vs. Vieillissement Nombre d'entre nous perçoivent le déclin du cœur comme un glissement inévitable vers l'obsolescence, mais la réalité est plus porteuse d'espoir. Le cœur n'est pas une bombe à retardement en décomposition ; c'est un muscle adaptable qui attend le bon stimulus. La célèbre étude de Dallas sur le repos au lit et l'entraînement a prouvé que seulement 20 jours d'inactivité totale ont vieilli le cœur de jeunes de 20 ans de plus de 30 années chronologiques.
The landscape of preventive cardiology has undergone a profound transformation with the emergence of subclinical imaging, specifically the quantification of coronary artery calcium (CAC). For decades, cardiovascular risk assessment relied almost exclusively on probabilistic models derived from population-wide observational data.
Ce que le record mondial de l'heure de Peter Megdal révèle sur le vieillissement, la condition physique et la récupération cardiovasculaire Pendant des décennies, on a supposé que la performance athlétique humaine suivait un déclin largement linéaire commençant au début de l'âge adulte. Les modèles physiologiques conventionnels prévoyaient que le système cardiovasculaire, la capacité pulmonaire et la fonction des muscles squelettiques se détérioreraient régulièrement à mesure que la sénescence cellulaire s'accumulait.
If you’re an endurance athlete, you’ve probably had this moment: your fitness is undeniable—resting heart rate is low, VO₂ is high, your training log looks like a work of art—and then a blood test shows LDL (“bad cholesterol”) is higher than expected. That can feel unfair. It can also trigger a very specific fear: “If I take a statin, will I lose performance?”
Peter Megdal, PhD, was a man who lived and breathed health. He was not just a regular guy who went to the gym. He was a world-record-holding cyclist. His legs were like steel. His lungs could breathe in huge amounts of air. He looked like the picture of perfect health. If you saw him riding his bike, you would think he would live to be one hundred years old.
The heat inside the velodrome rose like a living thing, swelling from seventy-five to eighty degrees Fahrenheit as the desert afternoon pressed against the curved walls. From beneath the wooden track came the faint, steady breathing of the air-handling system—a mechanical sigh under the foundation that vibrated faintly through the frame of my bicycle. Six thousand feet above sea level, in the thin air of Aguascalientes, Mexico, I began to ride.
C'est la mesure de prestige sur chaque montre de fitness et un indicateur clé de vitalité. Mais un VO₂ max élevé vous fait-il vraiment vivre plus longtemps ? Ou est-ce simplement le signe que vous faites déjà ce qu'il faut ? En tant qu'ingénieur médical (doctorant) et athlète de longue date, j'étudie la biologie de la performance depuis des décennies. Les preuves sont convaincantes, mais elles comportent aussi des nuances. Analysons la science : Corrélation vs. Causalité.
Les transformations de la santé commencent souvent par une prise de conscience — et pour Peter Megdal, cet appel est venu de son propre cœur. Après avoir reçu un diagnostic qui l'a forcé à affronter l'état de sa santé, Peter a commencé à remettre en question tout ce qu'il pensait savoir sur l'alimentation, la science et le bien-être. Ce qui a commencé comme un effort personnel pour guérir son cœur a évolué vers une mission plus profonde pour aider les autres à faire des choix éclairés et durables pour une vitalité à toute épreuve.
Can an elite athlete have heart disease? Short answer: yes. I’m a lifelong endurance cyclist—now 65 years old - with three national records and two world records. I once believed fitness was protection. Short answer: yes. I’m a lifelong endurance cyclist—now 65 years old—with three national records and two world records. I once believed fitness was protection. But heart disease doesn’t care how fit you are. This is how I went from five blocked arteries to another world record—and what athletes can do to protect their hearts.
What do people on social media mean by “ketosis,” and does it automatically mean “healthier”? Ketosis simply means your blood ketones (often β-hydroxybutyrate, βHB) are elevated because carbohydrate availability is low (fasting, very-low-carb diets) or because you ingested ketones.
Atherosclerosis is a chronic, progressive vascular condition traditionally managed by interventions aimed at slowing its advancement.1 The measurable reversal of this condition—defined as structural regression—is the highest therapeutic outcome in cardiovascular disease management.2 Regression is evidenced angiographically by an increase in Minimal Lumen Diameter (MLD) or a decrease in Percent Diameter Stenosis ( %DS ).
We all aspire to be winners, but what does it truly mean to be a winner? It’s often defined as someone who places first in a race or excels in a competition. However, winning can encompass much more than that. After a week of racing at the Masters National Championships in Milwaukee, Wisconsin, I believe I emerged as a winner with finishes of 2nd, 14th, and 5th place in various events organized by USA Cycling.
Q: Are endurance athletes really at higher risk for atrial fibrillation? A: Yes. Atrial fibrillation (AF) is common in the general population, with a lifetime risk of roughly 1 in 4 adults.¹ While moderate exercise protects cardiovascular health, long-term, high-volume endurance training is associated with significantly higher AF rates. Meta-analyses show endurance athletes have about 2.5–3.6× higher odds of AF than non-athletes.
Meet the "Masters Athlete." This is a person over age 50 who feels like they are in the prime of their life. They run long races, bike for hundreds of miles, and spend hours in the pool. To the outside world, they look like the picture of health. They have a slow, steady resting pulse and plenty of energy.
Le risque d'athérosclérose augmente-t-il avec l'âge ? Oui. L'athérosclérose est considérée comme une maladie du vieillissement. La probabilité et la gravité de l'accumulation de plaque dans les artères augmentent avec l'âge, même lorsque d'autres facteurs de risque tels que le tabagisme, l'hypercholestérolémie ou l'hypertension sont maîtrisés.
Peter Megdal sets cycling world record Survivor of heart disease excels in shattering limits others may set for him. [Editor's note: The following article concludes coverage in The Dedham Times of the world record Peter Megdal of Dedham holds in men's cycling. He set the new mark for ages 60-64 of 47.43 kilometers (29.47 miles) traversed in one hour on Sept. 12 at the Bicentario Velodromo in Aguascalientes, Mexico.
Peter Megdal sets new world record in cycling by Scott Heald | The Dedham Times The Guinness Book of World Records contains some zany entries indeed. One of those, achieved four-plus decades ago by a well-regarded Dedhamite, Mike Weir, who would go on to become the town’s police chief, involved throwing a grape the longest distance into the mouth of another person.
Tuesday, September 12th, Peter Megdal broke the Mens age 60 – 64 world record for the hour. At the Bicentario Velodromo in Aguascalientes, Mexico, Peter completed 47.430 kilometers (29.47 miles) in an hour, old record was 47.360 kilometers set in 2021 by Jim McMnurray of New Zealand.
Three-time national record holder explains his approach to improving health by Scott Heald / The Dedham Times / January 13, 2023 A traditional Romanian proverb states, “A great ship asks for deep waters.” Perhaps anyone who attempts something objectively daunting, unafraid to pursue opportunities that may not be readily apparent, is the sort of person to whom the proverb alludes.
Everyone has goals; for some, it's just to get out of bed in the morning, and others may want to become astronauts and rocket to the moon or Mars. I have spent years trying to break a world record in cycling. The last four years have thrown curveballs at me- such as recovering from heart disease, a broken hip last year, and this year COVID! On September 27, 2022, I competed at the world cycling track championships in Carson, CA, to attempt a 2-kilometer world championship race. Unfortunately, I had a terrible race and, in the process, contracted COVID. I was probably infected at the time that I was racing, which could account for my poor performance. To make matters worse, I was also planning to attempt a world record in the hour time trial in Aguascalientes, Mexico on October 17th, just three weeks away. How could I do this after such a poor performance only three weeks earlier?!
After setting the para C5 national record in 2018, I set my goal to best the current world record for the 60+-year-old when I turned 60.
Training Didn’t Help. My name is Dr. Peter Megdal, and this is my story of curing heart disease. In 2010 I noticed a steep drop in my power output during races. Racing cyclists have power meters that are attached to our bikes so we can accurately measure how strong we are in training and competitions. I was 50 years old, and my coach and my friends all told me that this was because I was getting older, but I knew a 15% drop was pretty steep and not normal especially in just one or two years.
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