Lactate Threshold
Lactate threshold is the exercise intensity at which lactate (lactic acid) starts to accumulate in the bloodstream.
In running, this intensity level is estimated in terms of pace, heart rate, or power. When a runner exceeds the
threshold, fatigue starts to increase at an accelerating rate. For experienced runners, the threshold occurs at
approximately 90% of their maximum heart rate and between 10 km 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 profile settings (
Your Heart Rate Zones, page 103
). You can turn on the Auto Detection feature to automatically record your
lactate threshold during an activity.
Performing a Guided Test to Determine Your Lactate Threshold
This feature requires a Garmin chest heart rate monitor. Before you can perform the guided test, you must put
on a heart rate monitor and pair it with your watch (
Pairing Your Wireless Sensors, page 86
).
The watch uses your user profile information from the initial setup and your VO2 max. estimate to estimate
your lactate threshold. The watch will automatically detect your lactate threshold during runs at a steady, high
intensity with heart rate.
TIP: The watch requires a few runs with a chest heart rate monitor to get an accurate maximum heart rate value
and VO2 max. estimate. If you are having trouble getting a lactate threshold estimate, try manually lowering your
maximum heart rate value.
1 From the watch face, press START.
2 Select an outdoor running activity.
GPS is required to complete the test.
3 Hold MENU.
4 Select Training > Workout Library > Lactate Threshold Guided Test.
5 Press START to start the activity timer, and follow the on-screen instructions.
After you begin your run, the watch displays each step duration, the target, and current heart rate data. A
message appears when the test is complete.
6 After you complete the guided test, stop the activity timer and save the activity.
If this is your first lactate threshold estimate, the watch prompts you to update your heart rate zones based
on your lactate threshold heart rate. For each additional lactate threshold estimate, the watch prompts you to
accept or decline the estimate.
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