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During physical activity, your body uses carbohydrates and fat as main sources of energy. The higher your training
intensity, the more carbs you use in proportion to fat, and vice versa. The role of protein is usually quite small, but during
high intensity activity and during long sessions your body can use about 5 to 10 % of its energy from protein.
We calculate the use of different energy sources based on your heart rate, but we also take your physical settings into
account. These include your age, gender, height, weight, maximum heart rate, resting heart rate, VO2max, aerobic
threshold and anaerobic threshold. It's important that you've set these settings as precisely as possible so you'll get the
most accurate energy source consumption data.
Energy sources summary
After your session, you'll see the following information the training summary:
Carbs, protein and fat you've used during your session.
Note that you shouldn't interpret the used energy sources and their amounts as
guidelines when eating after your session.
Detailed analysis in the Flow mobile app
In the Flow app you can also view how much of these sources you used at each point of your session and how they
accumulated throughout it. The graph shows how your body makes use of different energy sources at different training
intensities, and also at different stages of your training session. You can also compare the breakdown from similar
sessions over time, and see how your ability to use fat as the primary energy source develops.
Learn more about energy sources
Voice guidance
The voice guidance feature helps you focus on your training by providing relevant training data straight to your
headphones. It removes the need to look at the watch during the workout. The information you get in audio format includes
lap details, changes in heart rate, and guidance during training phases. To use the voice guidance feature, you need to
have the Flow app running on your phone, and it also needs to be paired with your watch. For instructions, see Pairing a
mobile device with your watch.
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