Lactate threshold testing for runners
A stepped treadmill test with blood lactate sampling that pins your aerobic (LT1) and lactate (LT2) thresholds to the decimal — the most precise way to set running zones and race pace.
Testing led by Jack Braniff — MSc Sport & Exercise Nutrition, SENr & CISSN registered, UKAD anti-doping advisor and author of Fuelling The Functional Athlete.
Why test
Lactate is the clearest signal your body gives
As you run faster, your muscles produce lactate. At easy paces you clear it as fast as you make it. Cross your first threshold (LT1) and it starts to rise; cross your second (LT2) and it accumulates faster than you can clear it — that's the pace you can't hold for long. Measuring lactate directly, drop by drop, is the most precise way to find both lines.
Those two thresholds define everything: how slow your easy runs should be, how hard your tempo work is, and the exact pace to target on race day. Get them from a blood test and your zones are real. Estimate them and you're guessing.
We plot your full lactate curve, mark LT1 and LT2, and translate them into pace and heart-rate zones you can put straight into your training.
| Your personal zones (pace & heart rate) | What it trains |
|---|---|
| Zone 1 — Recovery | Easy aerobic work, active recovery |
| Zone 2 — Endurance | Fat-burning base, the engine room |
| Zone 3 — Tempo | Sustained 'comfortably hard' efforts |
| Zone 4 — Threshold | Race pace around LT2 / FTP |
| Zone 5 — VO2 Max | Short, maximal intervals |
How it works
The step test, drop by drop
Consultation
A 15-minute chat about your running background, current paces, target races and goals, so we set sensible starting speeds and stage lengths.
Setup
Heart-rate monitor fitted and your fingertip prepped for clean, quick sampling between stages.
Step test
You run stages of a few minutes each at increasing speeds. At the end of every stage we take a small finger-prick sample and log your lactate and heart rate.
Build the curve
We plot lactate against pace to identify LT1 and LT2 precisely, and read off your heart rate and pace at each threshold.
Debrief & report
Jack walks you through your curve, your threshold paces and your personal zones, and how to build training around them. Report included.
Who it's for
Runners who want pacing certainty
Nail your race pace
Your threshold pace is the single most useful number for pacing a half or full marathon. Know it and you won't blow up at 30k.
End the grey zone
If your easy runs are too fast and your hard runs too easy, a lactate profile shows you exactly where the lines are.
Sharpen the tool
Doing tempo and threshold sessions? Anchor them to blood-measured pace instead of a guess and every session counts.
Common questions
What is a lactate threshold test?
It's a stepped run where we take a small finger-prick blood sample at the end of each stage to measure blood lactate. Plotting lactate against pace reveals your two thresholds — the pace where lactate first rises (LT1) and the pace where it starts accumulating rapidly (LT2).
Does the finger-prick hurt?
It's a tiny pinprick on the fingertip, similar to what people with diabetes use daily — a quick, minor scratch. We take one small drop per stage, a handful of times across the test.
Lactate or VO2 max — which do I need?
VO2 max measures your aerobic ceiling; lactate testing pinpoints the thresholds where your zones actually break. They answer different questions and work brilliantly together. If you mainly want precise pacing and zones, lactate is the sharper tool.
How should I prepare?
Come rested with no hard training in the previous 24–48 hours, well hydrated, and having eaten normally — a depleted or glycogen-low state shifts your lactate curve and skews the result.
What will I be able to do with the results?
Set precise pace and heart-rate zones, know the exact effort you can sustain in a race (your threshold pace), and structure training so you're spending time in the zones that actually move the needle.
Lactate threshold testing for runners in north Birmingham
Our lab sits at Hastingwood Business Park on Wood Lane, between Wylde Green and Erdington — a short walk from Wylde Green station, with free parking on site and easy reach of the M6.
We test runners, cyclists, triathletes and everyday clients from across Birmingham, Sutton Coldfield, Solihull, Tamworth, Lichfield and the wider West Midlands.
Unit C20, Hastingwood Business Park, Wood Lane
Birmingham B24 9QR
Thu 08–18 Fri 08–13 Sat 08–14 Sun —
Stop guessing.
Start measuring.
Know the exact pace you can hold before lactate runs away from you. Book your lactate profile and pace your next race on data.
Check availability & book online