Following endurance training, heart rate at a given oxygen uptake and cardiac output is lower because:Group of answer choicesstroke volume is increasedthe heart is less sensitive to adrenergic stimulationred cell mass is increased
Question
Following endurance training, heart rate at a given oxygen uptake and cardiac output is lower because:Group of answer choicesstroke volume is increasedthe heart is less sensitive to adrenergic stimulationred cell mass is increased
Solution
Following endurance training, heart rate at a given oxygen uptake and cardiac output is lower primarily because stroke volume is increased.
Here's a step-by-step explanation:
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Endurance training leads to physiological adaptations in the body, one of which is an increase in stroke volume. Stroke volume is the amount of blood pumped out of the heart with each beat.
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With an increased stroke volume, the heart doesn't need to beat as often to supply the same amount of blood to the body. This is because with each beat, more blood is being pumped out.
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Therefore, at a given oxygen uptake and cardiac output, the heart rate is lower because it's more efficient - it's pumping more blood with each beat due to the increased stroke volume.
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While the heart may also become less sensitive to adrenergic stimulation and red cell mass may increase, these are not the primary reasons for a lower heart rate at a given oxygen uptake and cardiac output following endurance training. The main reason is the increased stroke volume.
Similar Questions
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