Forerunner 310XT Owner’s Manual
Appendix
Heart Rate Zone Table
% of Maximum
Heart Rate or
Resting Heart
Rate
Perceived Exertion
Benefits
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