Estimate the caloric cost of the following activity: an individual who weighs 123.5 pounds runs 4.5 miles in 58 minutes (Table 6.9 is provided)
What will be an ideal response?
Each mile is about 1,600 meters, or four laps around a 400-meter (440-yard) track. Four and a half miles then would be 7,200 meters (1,600 x 4.5). Therefore, 4.5 miles (7,200 meters) in 58 minutes represents a pace of 124.1 meters per minute (7,200 ÷ 58). Table 6.9 indicates an oxygen requirement (uptake) of about 28.5 mL/kg/min for a speed of 124.1 meters per minute. A weight of 123.5 pounds equals 56 kilograms (123.5 ÷ 2.2046). The oxygen uptake in L/min now can be calculated by multiplying the value in mL/kg/min by body weight in kg and dividing by 1,000. In our example, it is (28.5 x 56) ÷ 1,000 = 1.6 L/min. This oxygen uptake in 58 minutes represents a total of 464 calories (1.6 x 5 x 58).
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