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His heart is stronger as well as being significantly larger. Per pump (stroke, beat), his trained heart can output a greater volume of blood than an untrained person (let's called the untrained person Joe Normal). So at rest, both Armstrong and Joe need to move the same volume of blood around per minute to keep everything oxygenated. Each beat of Armstrong's heart is going to move twice as much blood as a beat from Joe's. As a result, Armstrong's heart only needs to beat half as often to keep things oxygenated. How did this happen? Lots and lots of cardiovascular training. As the heart gets trained, it gets stronger and larger - it is a muscle, just like your biceps grow after multiple bicep curls in the gym. When Lance is sprinting as fast as he can, his heart is not pumping much more often than when a non-athlete is sprinting - but it's pumping out more blood per beat so he can go further and faster since his muscles can remain better oxygenation, produce less lactic acid and take longer to fatigue.

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โˆ™ 2007-10-10 16:50:26
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Q: How is it possible that Lance Armstrong has a resting heart rate of 32-34 bpm but his resting cardiac output is about the same as an untrained person who has a resting heart rate of 70 bpm?
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Related questions

What is the resting phase of the cardiac cycle?

The resting phace of the cardiac cycle is known as the refractory period


How is it possible that Lance Armstrong has a resting heart rate of 32 34 bpm but his resting cardiac output is about the same as an untrained person who has a resting heart rate of 70 bpm?

Low resting heart rate for athletes is very common because their heart has become very efficient in pumping blood. Efficiency in emptying out the ventricles more fully could be why his heart rate is lower. If he can pump more blood in one beat than an untrained person that means he would have to pump less times per minute to get the same amount of blood through out the systemic circulation. Another possibility, though i'm not sure about this one, his body may be better at substance exchange at the capillary network in the systemic circulation or at the level of the alveoli in the pulmonary ciruculation.


If resting cardiac output is six liters and maximum exercise cardiac output is sixteen liters what is the cardiac reserve?

10 liters


The stage of the cardiac cycle that directly follows the resting period?

Diastole


When the cardiac cells are in resting and negatively charged state this is known as?

Depolarization


What is Lance Armstrong's resting pulse rate?

I have seen that his resting pulse is abnormally low, around 32-34


Normal resting cardiac output for an adult is?

5 liters per minute


What effect does potassium have on the resting potential of a cardiac cell?

Increasing extracellular potassium causes the resting membrane potential to become more positive.


What is the stage of the cardiac cycle which precedes the resting period?

atrial systole <---- might be wrong


Is 38 bpm dangerous?

Lance Armstrong has a resting heart rate of 30 - 35.


How much blood is supplied to your brain?

Your brain gets about 15 % of the blood supply of the resting body cardiac out put. Your brain consume about 20 % of the glucose consumed by resting body.


It is normal to see sinus bradycardia in athletes during sleep?

Yes. Bradycardia is a resting heart rate below 50 beats per minute. The heart slows because it has a more effective cardiac output, less pumping is needed to move the same amount of blood. ex: Lance Armstrong has a resting heart rate of 38 bpm


Are there more sodium ions inside or outside a cardiac muscle cell during the resting membrane potential?

Outside


What are the different types of cardiac rates?

Resting heart rate = ~70 bpmTachycardia = >100 bpmBradycardia =


What likely happens to your heart rate as the cardiac muscle gets stronger?

Resting heart rate goes down (maximum stays the same).


Is a pulse rate of 125 bpm normal?

It depends how fit you are. The more fit you are, the slower your resting beats per minute will be. For example, Lance Armstrong has a resting rate of 30 bpm, which means he is incredibly fit.


Is it possible to induce extrasystole yes or no?

yes. during diastole (resting phase)


During exercise the cardiac output may rise to five times the resting value In most people this is due mainly to an increase in?

heart rate


What does cardacc output means?

well I'm not sure what "cardacc output" is but I certainly know what cardiac output is: the volume of blood pumped by the heart per minute (mL blood/min) for example an average person has a resting heart-rate of 70 beats per minute and a resting stroke volume of 70 milliliters per beat, so the cardiac out put is: Cardiac output= 70(beats) X 70 milliliters= 4900 milliliters per minute


How many times does your heart beat while sleeping?

Your sleeping heart rate is usually slower than your resting heart rate while awake. The actual number of beats will depend on different factors, such as fitness, resting rate, age, and whether you have any cardiac issues.


What will happen if your cardiac muscles contracts without resting?

if there z the continuos contraction then it leads to cardiac arrest.by which the blood supply also gets ceases and it leads to decreased transport of oxygen .which finally leads to apnoea r dysnoea.sometimes there occurs also a condition of hypertension at once.


If your have a heart rate of 45 to 65 while you are awake and a resting heart rate of 100 what does this mean?

It means you need to go see your doctor and have an EKG run, and probably a Cardiac Stress Test. Something is wrong. Your resting heart rate should be lower than when you are up and active.


What is your resting pulse?

Your resting pulse is the rate of your pulse when you are resting (when your not doing exersice).


What does descansa mean in English?

It means any of the following: you [singular] rest you [singular] are resting he rests he is resting she rests she is resting it rests it is resting As in English, 'resting' can be a euphemism for death.


A seed that is resting?

A seed that is resting is 'dormant'.