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Nutrition | How does Virtuagym calculate the BMR and the PAL value?

At Virtuagym, we calculate your energy need at rest, your total energy need, as well as give you daily calorie advice. Your Total Energy need is determined by the Basal Metabolic Rate (BMR) and the Physical Activity Level (PAL) value together. The BMR estimates the energy consumption of a person at rest and PAL value displays an image of the average degree of physical activity. Total energy need is the amount of kcal that need to be consumed in order to maintain your weight. Once the total energy need is established, calories are either added or removed from this value to help you achieve your goal. The formula we use for this calculation is presented below:


Total Energy Need = BMR X PAL

 

BMR

To calculate your BMR, Virtuagym has chosen the calculation method from James and Schofield (James and Schofield 1990). This method is widely used in science and provides a reliable estimate of the BMR.

Below you can find the data needed to calculate the BMR:

Gender

Age (years)

BMR kcal/day

Male

0-3
3-10
10-18

18-29
30-59
60-74
75+

60.9 x kg - 54
22.7 x kg + 495
17.5 x kg + 651

15.3 x kg + 679
11.6 x kg + 879
11.9 x kg + 700
8.4 x kg + 820

Female

0-3
3-10
10-18

18-29
30-59
60-74
75+

61.0 x kg - 51
22.5 x kg + 499
12.2 x kg + 746

14.7 x kg + 496
8.7 x kg + 829
9.2 x kg + 688
9.8 x kg + 624

 

Example: 
G
ender - female, Age - 30 years old, Weight - 60 kg
BMR in this case will be 8.7 x 60 + 829 = 1351 kcal

This means that 1351 kcal are needed to maintain basic life functions and it excludes daily activities, workouts etc. BMR shows the lowest number of kcal that can be consumed on a long-term basis to keep the body alive. It is not advised to go below that value at any point in your diet routine.

PAL value

Now that the BMR is calculated, it is important to estimate the PAL value. Each activity, even the smallest one, requires energy. A Metabolic Equivalent of Task (MET) is the ratio of energy expended during an activity to the energy expended at rest. If you want to learn more about MET of different activities and know how Virtuagym calculates calories you burn by exercising, click on this article. Calculating values of all your activities combined together during a 24 hour period gives the PAL value that Virtuagym uses in the final calculation of your total energy need.

At Virtuagym we divide activities into 'sleep', 'work' and 'leisure time' (with a total of 24 hours) to see how active you are daily.

MET values of different activities are presented below.

Sleep 

MET 0.9

Work

For work, a distinction is made between office work and standing work. The intensity of standing work may differ, therefore, this category distinguishes between light, average and heavy work. See the corresponding MET values that Virtuagym uses:

Office Work = MET 1.5

Standing Work
Light = MET 1.9
Average = MET 2.25
Heavy = MET 2.5

Leisure Activities

People differ in their leisure activities. That's why Virtuagym has chosen to categorize 3 different types.

The first type is not very active and spends time mainly lying and/or sitting. This person has a PAL value of 1.5 in his free time.

The Second type spends time just like the first type, mainly lying and sitting, but also does activities like shopping and light household tasks. The PAL value is therefore also slightly higher, namely 1.75.

The third type spends most of their free time with activities like groceries, cleaning, housework and more. The PAL value of this person in free time is 2.0.

It is important to know your type and select it correctly as this value is later used in the calculation of extra calories burned by exercise (article). If there are any changes in your sleep, work or lifestyle, you can always go back and create a new plan that will be adapted based on your new conditions.

Example:

If you sleep 8 hours a day, this means
8 (hours) x 0.9 (MET value) = 7.2
If you work 5 days a week 8 hours a day at the office
8 (hours) x 1.5 (MET value) = 12
If the remaining 8 hours you spend as type 1 (not very active)
8 (hours) x 1.5 (PAL value) = 12
Total 31.2
31.2 is now divided by 24 hours to calculate the average of activity on a weekday (31.2: 24 = 1.3)

The weekend is calculated as 'leisure time' in this example you are a type 1 (not very active)
This means:
You sleep for 8 hours, therefore
8 (hours) x 0.9 (MET value) = 7.2
As there is no work, other hours are calculated as free time
16 (hours) x 1.5 (PAL value) = 24
Total 31.2

31.2 is now divided by 24 hours to calculate the average of activity during the weekend (31.2: 24 = 1.3)
The average PAL of the week is 1.3

Calculating the Total Energy Need

BMR x PAL value = 1351 x 1.3 = 1756.3 kcal for maintenance

Similarly to this example, your total energy need is calculated. In your complete nutrition plan, you can see your BMR, total energy need as well as a daily calorie advice that is based on your goal. To find out how to create your nutrition plan, click on this article.

 

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