Pratique du Shadowing: What happens to your body at the top of Mount Everest - Andrew Lovering - Apprendre l'anglais à l'oral avec YouTube
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The Earth is a very difficult time.
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The Earth is a very difficult time.
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If someone teleported from sea level to the top of Mount Everest,
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things would go bad fast.
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At an altitude of 8,848 meters,
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barometric pressure is approximately 33% of what it is at sea level.
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This means there's significantly less oxygen in the air,
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and our teleported individual would likely suffocate in minutes.
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However, for people that make this same journey over the course of a month,
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it's possible to survive at the peak for hours.
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So what can happen to our bodies in just one month that allows us to endure this incredible altitude?
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Let's imagine you're one of the 5.8 billion people living less than 500 meters above sea level.
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When you take a breath at this altitude,
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your lungs fill up with air composed of numerous gases and compounds.
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Most important among these are oxygen molecules,
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which bond to the hemoglobin in your red blood cells.
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Blood then circulates throughout your body,
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bringing essential oxygen to all your cells.
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But as altitude increases, the air starts to get thinner.
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The relative amounts of each compound remain the same well into the upper atmosphere.
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But overall, there's less oxygen for our bodies to absorb.
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And if you ascend to altitudes above 2,500 meters,
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the resulting oxygen deprivation can cause a form of altitude sickness known as AMS,
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often causing headaches, fatigue, and nausea.
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Fortunately, AMS only happens when we ascend too fast,
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because our bodies have numerous ways of adapting to high altitudes.
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Within minutes or even seconds of reaching altitudes of 1,500 meters,
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carotid chemoreceptors in your neck sense your blood's low oxygen pressure.
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This triggers a response that increases the rate and depth of your breathing to counteract the lack of oxygen.
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Your heart rate also increases,
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and your heart contracts more tightly to pump additional blood with each beat,
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quickly moving oxygenated blood around your body.
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All these changes happen relatively fast,
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and if you were to keep ascending,
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your heart rate and breathing would speed up accordingly.
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But if you've stayed at this altitude for several weeks,
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you could reap the benefits of some longer-term adaptations.
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Within the first few days above 1,500 meters,
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the volume of plasma in your blood decreases,
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which increases the concentration of hemoglobin.
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Over the next two weeks,
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your hemoglobin levels will continue to rise,
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allowing your blood to carry even more oxygen per milliliter.
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Paired with your high heart rate,
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this new hemoglobin-rich blood efficiently distributes oxygen throughout your body,
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so much so that the volume of blood being pumped with each heartbeat can return to normal levels.
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Over this same time, your breathing also increases even further in a process called ventilatory acclimatization.
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After this several weeks of extended acclimatization,
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your body has made enough significant changes to climb even higher.
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However, you'll still have to spend additional time acclimating along the way,
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often climbing back down to recover before ascending even higher.
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Because the summit of Everest isn't just high,
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it's the highest place on Earth.
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And at altitudes above 3,500 meters,
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our bodies are under incredible stress.
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Arteries and veins in the brain dilate to speed up blood flow,
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but our smallest blood vessels,
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called capillaries, remain the same size.
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This increased pressure can cause blood vessels to leak,
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and fluid to build up in the brain.
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A similar issue can occur in the lungs,
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where low oxygen causes blood vessels to constrict,
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leading to more leaking vessels and fluid buildup.
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These two conditions, known as HACE and HAPE,
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respectively, are incredibly rare, but can be life-threatening if not dealt with quickly.
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Some Tibetans and South Americans with family histories of living at high altitude have genetic advantages that can prevent minor altitude sickness.
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But even they aren't immune to these severe conditions.
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Yet despite these risks, climbers over the last century have proved people can go higher than scientists ever thought possible.
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Pushing past their body's limitations,
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these climbers have redefined what humanity can adapt to.
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About This Lesson
In this lesson, you will practice your English listening and speaking skills by analyzing the fascinating physiological changes that occur in the human body at extremely high altitudes, specifically the summit of Mount Everest. You will learn how the body adapts to lower oxygen levels and the reasons why climbers can survive at such heights. By engaging with this content, you will not only expand your vocabulary related to altitude and human biology but also enhance your ability to articulate these concepts clearly in English.
Key Vocabulary & Phrases
- Barometric pressure: The pressure exerted by the weight of the atmosphere.
- Altitude sickness: A condition that can occur at high elevations due to low oxygen levels, presenting symptoms such as headaches and fatigue.
- Acclimatization: The process by which the body adjusts to changes in its environment, especially changes in altitude.
- Hemoglobin: A protein in red blood cells that binds to oxygen, essential for transporting it through the bloodstream.
- Cardiovascular response: The heart's adjustments to changes in oxygen availability, including increased heart rate and blood flow.
- HACE (High Altitude Cerebral Edema): A potentially life-threatening condition where excess fluid builds up in the brain due to low oxygen levels.
- HAPE (High Altitude Pulmonary Edema): A serious condition where fluid accumulates in the lungs, impairing oxygen exchange.
Practice Tips
To effectively improve your English pronunciation using the shadowing technique, consider the following tips while watching the video:
- Listen closely to the natural rhythm and intonation of the speaker. This will help you understand how to emphasize key phrases like "barometric pressure" or "altitude sickness."
- Practice shadowing in short segments, pausing after each sentence to repeat what you hear. This method will help you manage the speed of the delivery and improve your comprehension.
- Record yourself while shadowing and compare your pronunciation with the original speech. Look for areas where you can improve your clarity and accuracy, focusing on terms like "acclimatization" and "hemoglobin."
- Engage with the material multiple times. The more you practice with this content that includes specific terms relevant to high altitudes, the better your shadow speech will become.
- Finally, explore additional resources on a dedicated shadowing site to find more examples and exercises that can further aid in your learning journey.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.
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