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Your A300 automatically calculates a personalized turning point where the main effect of your training turns
from fat burning to fitness improving. This point is called EnergyPointer. The average EnergyPointer value cor-
responds to 69% of your maximum heart rate. However, it is normal that EnergyPointer value varies as your
daily physical and mental condition varies. Your A300 detects your body's daily state from your heart rate and
heart rate variability and, if necessary, adjusts the EnergyPointer accordingly. For example, if your body is
recovered from previous training session and you're not tired or stressed, then you are prepared for more
intensive training and the Energy Pointer value changes. The highest possible value of EnergyPointer is 80%
of your maximum heart rate.
Below you can see how the EnergyPointer is shown on your A300 during training.
Your current heart rate
The number 130 in the image shows the EnergyPointer. The heart symbol
tells you whether you're burning fat or improving fitness. In the image, the
symbol is on the left side meaning that you're burning fat.
HEART RATE ZONES
Your A300 uses Polar heart rate zones in training sessions that you've planned in the Flow web service
and synced to your A300 as training targets.
Polar heart rate zones introduce a new level of effectiveness in heart rate-based training. Training is divided
into five heart rate zones based on percentages of maximum heart rate. With heart rate zones, you can easily
select and monitor training intensities.
Target zone Intensity % of HR
max
HR
max
= Maximum
heart rate (220-age).
Example: Heart
rate zones (in
beats per minute)
for a 30-years-old
person, whose
maximum heart
rate is 190 bpm
(220–30).
Example durations Training effect
MAXIMUM 90–100% 171–190 bpm less than 5
minutes
Benefits: Max-
imal or near
maximal effort
for breathing