Garmin Edge 605 User Manual

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minute. The five commonly accepted 

heart rate zones are numbered from 

1–5 according to increasing intensity. 

Generally, heart rate zones are 

calculated based on percentages of 

your maximum heart rate. 

Knowing your heart rate zones can 

help you measure and improve 

your fitness by understanding and 

applying these principles:

1

50–60%

Relaxed, easy pace; 

rhythmic breathing

Beginning-level aerobic 

training; reduces stress

2

60–70%

Comfortable pace; 

slightly deeper breathing, 

conversation possible

Basic cardiovascular training; 

good recovery pace

3

70–80%

Moderate pace; more 

difficult to hold conversation

Improved aerobic capacity; 

optimal cardiovascular training

4

80–90%

Fast pace and a bit 

uncomfortable; breathing 

forceful

Improved anaerobic capacity 

and threshold; improved speed

5

90–100%

Sprinting pace,

unsustainable for long 

period of time; labored 

breathing

Anaerobic and muscular 

endurance; increased power