Polar Electro F4 User Manual page 14

ENGLISH
• Improves aerobic fitness
• Improves endurance
• Helps in weight control
• Accustoms your body to exercising at a faster
pace
• Helps to increase the speed you can maintain
without building up lactic acid
At 80-90% of your HRmax, you have moved into
the Hard Intensity Zone. Exercise in the hard
intensity zone definitely feels "hard". You will find
yourself breathing heavily, having tired muscles
and feeling fatigued. This intensity is
recommended occasionally for fit people.
Exercising in this zone is intensive, so it provides
some unique benefits.
• Increases muscles' tolerance to lactic acid (your
anaerobic threshold)
• Improves hard, short effort ability
When you exercise in the right intensity zones, it
guarantees your enjoyment in your favourite
sports. Alternate between intensity zones to
improve your fitness and get variation in your
14 Settings
exercise. Remember that the lower the intensity
the longer you can comfortably exercise in it.
Exercise in higher intensity for shorter periods.
Polar target heart rate intensity definition is
modified from international exercise science
authorities' recommendations in which light
intensity can reach lower than 60% of HR
max