Introduction

Metabolic Equivalent of Task (MET) is a unit that represents the energy expenditure of a given physical activity. It allows individuals to understand and compare the intensity of various activities, helping them plan workouts and monitor energy expenditure more effectively. In this article, we will delve into the concept of MET and explain how to calculate it.

Understanding MET

In simple terms, one MET represents the energy expended by an individual at rest. Essentially, it is the baseline energy expenditure. When engaging in physical activities, the body uses more energy as compared to when at rest – that’s where MET comes in handy. Comparing different activities’ MET values can help determine their relative intensity. For instance, an activity with a MET value of 2 requires twice as much energy as being at rest, while one with a MET value of 6 requires six times more energy.

Calculating MET

To calculate MET for a specific activity, follow these steps:

1. Determine your Basal Metabolic Rate (BMR): BMR refers to the number of calories required by your body to maintain its basic functions while at rest. You can estimate your BMR using several equations such as Mifflin-St Jeor or Harris-Benedict formulas.

2. Calculate your resting oxygen consumption: One MET is equivalent to approximately 3.5 milliliters of oxygen per kilogram of body weight per minute (3.5 ml/kg/min). Calculate your resting oxygen consumption by multiplying your weight in kilograms by 3.5 ml/kg/min.

3. Look up the activity’s MET value: Refer to resources like the Compendium of Physical Activities, which provides standardized MET values for a wide range of activities based on research.

4. Calculate total energy expenditure: Multiply the activity’s MET value by your resting oxygen consumption rate from step 2 to determine the total number of calories burned per minute.

5. Estimate the total energy expenditure for the activity duration: Multiply the rate from step 4 by the activity’s duration in minutes to calculate the total calories burned during that time.

Here’s an example:

Let’s say you weigh 70 kg, and you want to calculate MET for a 30-minute jogging session. You’d first determine your BMR and resting oxygen consumption:

Resting Oxygen Consumption = 70 kg x 3.5 ml/kg/min = 245 ml/min (rounded)

Next, look up the MET value for jogging, which is around 7 METs (varies depending on intensity). Now calculate the energy expenditure per minute and total expenditure for the activity duration:

Energy Expenditure per Minute = Resting Oxygen Consumption x MET value

= 245 ml/min x 7 = 1,715 ml/min

Total Energy Expenditure:

Energy Expenditure per Minute x Duration

= 1,715 ml/min x 30 min

= 51,450 ml (rounded)

In this example, your body would burn approximately 51,450 milliliters of oxygen during a half-hour Jogging session.

Conclusion

Calculating MET allows you to understand your energy expenditure during various activities and tailor your workouts based on intensity and goals. Remember that individual factors might influence these calculations, so consider consulting with a professional or using wearable technology for precise measurements.