Calculation of Training VO2:
Given: Weight of the man = 75 kg, Cycling power output = 120 watts
To calculate the Training VO2, we can use the following equation:
VO2 (mL/kg/min) = (Power output (W) / Weight (kg)) * 10.8
VO2 = (120 watts / 75 kg) * 10.8
VO2 = 17.28 mL/kg/min
Therefore, the Training VO2 is approximately 17.06 mL/kg/min. (Option b)
Calculation of Energy Expenditure:
Given: Duration of the ride = 30 minutes
To calculate the Energy Expenditure, we can use the following equation:
Energy Expenditure (kcal) = METs * Weight (kg) * Time (hours)
METs can be estimated using the following formula:
METs = VO2 (mL/kg/min) / 3.5
METs = 17.06 mL/kg/min / 3.5
METs = 4.88
Energy Expenditure = 4.88 * 75 kg * (30 minutes / 60)
Energy Expenditure = 9.2 kcal
Therefore, the Energy Expenditure during the 30-minute ride is approximately 9.2 kcals. (Option b)
Appropriate Walking Speed on a 10% Grade:
To determine the appropriate walking speed, we need to refer to a MET-speed table. According to the table, walking on a 10% grade requires an average speed of 100 m/min.
Therefore, the appropriate walking speed on a 10% grade is 100 m/min. (Option d)
Calculation of Energy Expenditure during Aerobic Dance Class:
Given: Weight of Lisa = 58 kg, Step rate = 20 steps per minute, Duration = 20 minutes
To calculate the Energy Expenditure, we can use the following equation:
Energy Expenditure (kcal) = METs * Weight (kg) * Time (hours)
METs for aerobic dance class can be estimated as 6.
Energy Expenditure = 6 * 58 kg * (20 minutes / 60)
Energy Expenditure = 116 kcal
Therefore, Lisa will expend approximately 116 kcals in 20 minutes. (Option d)
Equivalent Work Rate on the Leg Ergometer:
Given: Power output on the leg ergometer = 120 watts
To calculate the Equivalent Work Rate, we need to convert watts to kg/m/min.
Equivalent Work Rate = Power output (watts) * 3.6 kg / m / min
Equivalent Work Rate = 120 watts * 3.6 kg / m / min
Equivalent Work Rate = 432 kg / m / min
Therefore, the Equivalent Work Rate on the leg ergometer is 432 kg / m / min. (Option d)
Calculation of VO2 during Running on a Level Track:
Given: Weight of the male = 80 kg, Running speed = 9 mph
To calculate the VO2, we can use the following equation:
VO2 (mL/kg/min) = (0.1 * Speed (mph) + 3.5) * Weight (kg) / 3.5
VO2 = (0.1 * 9 mph + 3.5) * 80 kg / 3.5
VO2 = 42.3 mL/kg/min
Therefore, the VO2 during running on a level track is approximately 42.3 mL/kg/min. (Option d)
Calculation of Calories per Minute Expenditure:
To calculate the Calories per Minute Expenditure, we can use the following equation:
Calories per Minute = VO2 (mL/kg/min) * Weight (kg) / 1000
Calories per Minute = 42.3 mL/kg/min * 80 kg / 1000
Calories per Minute = 3.38 kcals/min
Therefore, the man is expending approximately 3.38 kcals per minute. (Option c)
