Lactate Threshold Heart Rate (LTHR)

Your lactate threshold heart rate (LTHR) is the heart rate that corresponds to your lactate threshold (LT). It is specific to the activity, so you will have a different LTHR for running, cycling, swimming, skiing, etc. An athlete’s LTHR for cycling is typically 5-10 beats lower than that athlete’s LTHR for running, so it is possible to estimate one from the other if sport-specific tests are not available for both.