Configuración de las zonas de lactato en sangre
Most people who pay for a lactate test never change a single thing afterwards. They get a PDF with a curve on it, read it once, put it in a folder, and carry on training off whatever zones their watch guessed on the day they bought it.
That is not because the test was wasted money. It is because almost nobody explains the step in between: what the result actually gives you, and how it gets onto the device you train with. This page is that step.
What you walk out of a test with
Strip away the presentation and a lactate test hands you three things.
- A heart rate at your threshold. The heart rate you were holding at the point where blood lactate started climbing away from steady state rather than sitting level.
- A pace or a power at the same point. Pace if you were tested running, power if you were tested on a bike. This is the more precise of the two numbers, and the more fragile — see the mistakes below.
- The curve those came from. Lactate plotted against intensity, stage by stage. Most testers also mark a lower turn point, where lactate first lifts off baseline, which is what anchors the bottom of your easy range.
If you are not sure what the threshold itself represents, start here. If you have not been tested yet and want to know what the session involves, this explains the lab protocol.
What you do with it
- Pick your anchor. Everything hangs off the threshold figures, not off your maximum heart rate. That single choice is what you paid for.
- Enter the threshold heart rate, and the threshold pace or power, into your watch's athlete profile. On most Garmin and comparable devices these live with your physiological settings rather than on a workout screen.
- Switch the zone calculation method over to threshold. Watches usually offer a choice: build the zones from a percentage of maximum heart rate, from heart rate reserve, or from your lactate threshold heart rate. You want the last one.
- Do it for every sport you train in, separately. Zone settings are commonly stored per activity profile, not once for the whole watch.
- Leave it alone and train. Give it a few weeks before you decide it is wrong.
Then use them. Zones that exist only in a settings menu change nothing — the point is that your easy runs get genuinely easy, which is the whole argument behind zone 2 work.
Four mistakes that make a lactate test worthless
These are the ones that quietly undo the whole exercise. The last one is the most common and the hardest to spot.
| Mistake | What you see | What to do instead |
|---|---|---|
| Zones set in one sport profile only | Running feels right; the bike or the pool produces nonsense, often everything logged as one zone too high or too low | Set each profile separately. Threshold heart rate is sport-specific — for most people it sits lower on the bike than running, because less muscle mass is working |
| A treadmill test applied to hilly outdoor running | Pace zones that are unreachable on a climb and far too slow on a descent, so every hilly run looks like a failure | Treat the heart rate zones as the ones that travel. Pace from a flat, controlled, windless treadmill does not transfer to real terrain — run hills on effort and heart rate |
| Treating an old threshold figure as permanent | Easy runs that have crept into feeling like work, or threshold sessions that stopped being hard | Re-test, or at least re-estimate, after a solid training block. Threshold moves with fitness — that is the point of training to raise it |
| Numbers typed in correctly, but the watch still calculating zones from maximum heart rate | Zone boundaries that are not the ones on your PDF, and that silently reset themselves after an update or a profile change | Check the zone method, not just the values. If the method is still a percentage of max HR, your typed figures are decoration |
That last one deserves its own warning. Many watches will also auto-detect a threshold during hard runs and overwrite what you entered — useful if you trust it, destructive if you do not. If your figure keeps changing on its own, this covers why Garmin's auto-detected threshold moves, and this covers the wider problem of wrong heart rate zones, which usually traces back to a maximum heart rate the watch guessed from your age.
How to tell the zones are working, without any equipment
You do not need a second test to sanity-check the first one. You need two sessions and some honesty.
A correctly-set easy run
You can hold a full conversation in complete sentences, not gasped phrases. Your breathing is unremarkable — if you chose to breathe through your nose, you could. The pace feels slow enough to be slightly embarrassing. You finish able to do the same thing again tomorrow, and the day after. If it feels like training, it is too fast.
A correctly-set threshold session
Comfortably hard, and the two words carry equal weight. You can speak, but in short phrases. The effort is controlled and steady rather than ragged, and you could hold it well past the point where it stops being pleasant — but nowhere near all day. The strongest sign is repeatability: the last repetition should feel like the first one, not like survival.
Signs the zones are wrong
- Every easy run drifts up a zone by the second half, even on flat ground in cool weather.
- Your threshold session leaves you unable to finish the set, or finishes with you wondering when it starts.
- Nearly all your training lands in one middle zone, whatever you set out to do.
- Your zone boundaries changed and you did not change them.
Heat, illness, poor sleep, caffeine and altitude all shift heart rate for a given effort, so judge the zones over a few weeks rather than off one bad Tuesday. Persistent, unexplained drift is worth paying attention to — some of it belongs in a training review, and anything that worries you belongs with a doctor. Nothing here is medical advice.
Frequently asked questions
Do I set the zones on my watch or in the app?
Set them wherever your athlete profile lives, then let it sync. On most set-ups the phone app and the watch mirror the same profile, so editing one updates the other — but check both afterwards, because the two can disagree after a firmware update.
Should I use heart rate zones or pace zones?
Both, for different jobs. Pace or power is the better target for flat, controlled sessions, because it responds instantly. Heart rate is the better target for long, easy and hilly running, because it accounts for terrain, heat and fatigue.
How often should I re-test?
After a meaningful block of training, or whenever the sessions stop matching the feel descriptions above. There is no fixed calendar interval worth quoting — a new athlete improving quickly will outgrow a result far sooner than someone holding steady fitness.
My lab zones are different from the ones my watch suggested. Which is right?
The lab ones. Your watch's default zones are built from estimates, usually anchored to a maximum heart rate it inferred from your age. A measured threshold beats an inferred maximum every time.
Can I use my running threshold for cycling?
Not directly. Threshold heart rate is usually lower on the bike than running for the same athlete, and pace obviously does not transfer at all. Either test in the sport that matters most to you, or use a separate, sport-specific estimate.
Make the test change what you do next week
A test result only pays for itself once it reaches the sessions you actually run, and that is the step that usually gets skipped. Lactate Training builds training zones from your lactate threshold rather than an age-based guess, syncs your Garmin activities and health data, and adapts the plan as the threshold moves.