Polar Electro RS400 User Manual page 9

How to change the target zones?
• Settings > Features > Sport zones
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Low limit (30%)
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Z1-Z2 (60%)
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Z2-Z3 (76%)
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Z3-Z4 (86%)
(
Z4-Z5 (94%)
Recovery = 30-59%
Low Intensity = 60-75%
Medium Intensity = 76-85%
High Intensity = 86-93%
Maximal Intensity = 94-100%