High School

1. If a 20-year-old, 145 lb female athlete wants to run on a treadmill at a speed of mph for 30 minutes:

a. Determine oxygen consumption in ml/kg/min.

b. Determine energy expenditure in kcal for 30 minutes of running.

2. If a 120 lb female cycles at 85 Watt intensity for 25 minutes, determine the following:

a. Exercise intensity in METs.

b. Total kcals in 25 minutes.

c. Oxygen consumption in L/min.

Answer :

Final answer:

The oxygen consumption for the 20-year-old female athlete running on a treadmill at a speed of mph is 395.4 ml/kg/min. The energy expenditure for 30 minutes of running is 3,903.9 kcal. The exercise intensity for the female cyclist cycling at 85 watts is 1.56 METS. The total calories burned in 25 minutes of cycling is 3,253.75 kcal. The oxygen consumption for the athlete is 26.03 L/min.

Explanation:

Calculating Oxygen Consumption and Energy Expenditure During Exercise

When determining oxygen consumption and energy expenditure during exercise, several factors need to be considered, such as the individual's age, weight, and exercise intensity.

1. Oxygen Consumption in ml/kg/min

To calculate oxygen consumption in ml/kg/min, we need to know the individual's weight in kilograms and the exercise intensity in METS.

Given that the athlete is a 20-year-old female weighing 145 pounds (65.9 kilograms) and wants to run on a treadmill at a speed of mph, we can calculate the oxygen consumption as follows:

  2. Convert the weight from pounds to kilograms: 145 pounds = 65.9 kilograms.
  4. Convert the speed from mph to METS using a conversion factor: 1 METS = 3.5 ml/kg/min. If the speed is 6 mph, the exercise intensity is 6 METS.
  6. Calculate the oxygen consumption: Oxygen Consumption = Weight (kg) x Exercise Intensity (METS) = 65.9 kg x 6 METS = 395.4 ml/kg/min.

2. Energy Expenditure in kcal

To determine the energy expenditure in kcal for 30 minutes of running, we can use the following formula:

Energy Expenditure (kcal) = Oxygen Consumption (ml/kg/min) x Weight (kg) x Time (min) x 5 kcal/L.

Given that the athlete wants to run for 30 minutes, we can calculate the energy expenditure as follows:

  2. Calculate the oxygen consumption per minute: Oxygen Consumption per Minute = Oxygen Consumption (ml/kg/min) x Weight (kg) = 395.4 ml/kg/min x 65.9 kg = 26,027.86 ml/min.
  4. Convert the oxygen consumption per minute to liters per minute: Oxygen Consumption per Minute (L/min) = Oxygen Consumption per Minute (ml/min) / 1000 = 26,027.86 ml/min / 1000 = 26.03 L/min.
  6. Calculate the energy expenditure: Energy Expenditure (kcal) = Oxygen Consumption per Minute (L/min) x Time (min) x 5 kcal/L = 26.03 L/min x 30 min x 5 kcal/L = 3,903.9 kcal.

3. Exercise Intensity in METS

To determine the exercise intensity in METS, we need to know the power output in watts and the individual's weight in kilograms.

Given that the female cyclist weighs 120 pounds (54.5 kilograms) and cycles at 85 watts, we can calculate the exercise intensity as follows:

  2. Convert the weight from pounds to kilograms: 120 pounds = 54.5 kilograms.
  4. Calculate the exercise intensity in METS: Exercise Intensity (METS) = Power Output (Watts) / Weight (kg) = 85 watts / 54.5 kg = 1.56 METS.

4. Total Kcals in 25 Minutes

To determine the total calories burned in 25 minutes of cycling, we can use the following formula:

Total Kcals = Oxygen Consumption (L/min) x Time (min) x 5 kcal/L.

Given that the cyclist cycles for 25 minutes and the oxygen consumption is 26.03 L/min (calculated earlier), we can calculate the total calories burned as follows:

Total Kcals = 26.03 L/min x 25 min x 5 kcal/L = 3,253.75 kcal.

5. Oxygen Consumption in L/min

To determine the oxygen consumption in L/min, we can convert the oxygen consumption from ml/kg/min to L/min using the individual's weight in kilograms.

Given that the athlete weighs 145 pounds (65.9 kilograms) and the oxygen consumption is 395.4 ml/kg/min (calculated earlier), we can calculate the oxygen consumption in L/min as follows:

  2. Calculate the oxygen consumption per minute: Oxygen Consumption per Minute = Oxygen Consumption (ml/kg/min) x Weight (kg) = 395.4 ml/kg/min x 65.9 kg = 26,027.86 ml/min.
  4. Convert the oxygen consumption per minute to liters per minute: Oxygen Consumption per Minute (L/min) = Oxygen Consumption per Minute (ml/min) / 1000 = 26,027.86 ml/min / 1000 = 26.03 L/min.

Summary:

The oxygen consumption for the 20-year-old female athlete running on a treadmill at a speed of mph is 395.4 ml/kg/min. The energy expenditure for 30 minutes of running is 3,903.9 kcal. The exercise intensity for the female cyclist cycling at 85 watts is 1.56 METS. The total calories burned in 25 minutes of cycling is 3,253.75 kcal. The oxygen consumption for the athlete is 26.03 L/min.

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