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What is a good hypothesis for, how does heart rate change during and after an exercise is performed for two different periods of time?

What is a good hypothesis for, how does heart rate change during and after an exercise is performed for two different periods of time?
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what is a good hypothesis for, how does heart rate change during and after an exercise is performed for two different periods of time?

what is a good hypothesis for, how does heart rate change during and after an exercise-example-1
User Alex Yagur
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As you workout your heart rate will increase because you need oxygen.
User Naabster
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