44 Forerunner
®
735XT
EN
Lactate Threshold
Lactate threshold is the exercise intensity at
which lactate (lactic acid) starts to accumu-
late in the bloodstream. In running, it is the
estimated level of effort or pace. When a runner
exceeds the threshold, fatigue starts to in-
crease at an accelerating rate. For experienced
runners, the threshold occurs at approximately
90% of their maximum heart rate and between
10k and half-marathon race pace. For average
runners, the lactate threshold often occurs well
below 90% of maximum heart rate. Knowing
your lactate threshold can help you determine
how hard to train or when to push yourself
during a race.
If you already know your lactate threshold heart
rate value, you can enter it in your user prole
settings
(Setting Your Heart Rate Zones, page
28)
.
Performing a Guided Test to Determine Your
Lactate Threshold
Before you can perform the guided test, you
must put on a heart rate monitor and pair
it with your device
(Pairing ANT+ Sensors,
page 69)
. You must also have a VO2 max.
estimate from a previous run
(About VO2 Max.
Estimates, page 37)
.
TIP: The device requires a few runs with a
heart rate monitor to get an accurate maximum
heart rate value and VO2 max. estimate.
1 Select an outdoor running prole. GPS is
required to complete the test.
2 Select Menu > My Stats > Lactate Thresh-
old > Do Guided Test.
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