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About body composition
How does body composition measurement work?
The body composition feature works by sending a small and harmless electrical current through your
body. The current flows more easily through muscle than through fat, so by measuring how much
current flows at various frequencies, an estimate of the percentage of body fat and muscle can be
calculated. Everything else that your body is composed of falls into the “other” category, for
example water or bone. Your body composition results for body fat, muscle and "other" add up to
100%.
Your body composition measurement is stored by your TomTom Touch and then transferred to the
MySports app and MySports website where you can see it alongside your steps, calories, distance and
active time metrics. This means that you can track your efforts and results in the same place.
Why measure body composition?
Measuring what your body is made up of gives you more relevant results than simply weighing or
calculating your BMI (body mass index). Since muscle weighs more than fat, you could gain weight
from strength training, yet look slimmer. By measuring your body composition over time, you’ll be
able to see if your muscle and fat percentages go up or down and you’ll have a more accurate
picture of how your body is changing.
Accuracy of measurements
When looking at body composition measurements, the important thing to note is the trend over
time. Many factors, such as exercise, eating and hydration levels can influence a single measure-
ment and therefore cause daily fluctuations. You’ll be able to see how your fat and muscle
percentages change over time in the MySports app and on the MySports website.
We recommend that you measure your body composition at the same time of day, and follow the
steps in Measuring body composition.
Measuring body composition
Important: When you take a body composition measurement, you do the measurement on your
TomTom Touch but the result appears ONLY on your phone in the MySports Mobile App or on the
MySports website.
To get an accurate measurement, follow the steps below.
1. Wear your fitness tracker for at least 15 minutes before performing a measurement.
Tip: 15mins allows the electrode on your wrist to get to skin temperature for an accurate
result.
Important: For an accurate result take your body composition measurement reading at the
same time of the day.
2. Wake up your TomTom Touch by pressing the button.
3. Swipe to two screens above the clock screen of your fitness tracker, where you see a
percentage sign.
Body composition
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