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B. Carbohydrates act as an energy source. Carbohydrates are broken down into starch. Starch is a type of sugar and sugar gives us ENERGY.
<span>Heart Rate Reserve, HRR. Heart rate reserve (HRR) is the difference between resting heart rate (HR<span>rest) and maximum heart rate</span> (HRmax). Heart rate reserve is used when determining exercise heart rates. The Karvonen formula is used to calculate exercise heart rate at a given percentage training intensity.</span>
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what are the answer choises
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