Lactate Threshold: Why a "Good" Test Result Can Fool Your Coaches

Lactate threshold testing is supposed to show you if your training is working. But a right-shift in the lactate curve can mean two completely opposite things — and most coaches can't tell which one they're looking at. INSCYD co-founder Sebastian Weber explains the metabolic mechanism behind the lactate threshold curve shift: why the same test result can signal either improved aerobic capacity or quietly destroyed anaerobic power — depending on your athlete's sport. What you'll learn: • Why lactate concentration = production (VLamax) + combustion (VO2max) — and why separating them changes everything about how you read a lactate threshold test • Why a right-shift is good for triathletes but can sabotage cyclists, swimmers, and kayakers • The Feedback Trap: how coaches unknowingly continue training that erodes VLamax in athletes who depend on it • The Hidden Decline: how both VO2max and VLamax can drop simultaneously while the lactate threshold curve still looks like progress • The HIIT Paradox: why your training can work perfectly while your test results appear flat If you're setting training zones from lactate threshold data alone, this video explains exactly what you're not seeing — and why INSCYD was built to show the mechanism, not just the curve. → Book a free INSCYD demo: https://inscyd.com/demo → INSCYD website: https://inscyd.com When you see a right shift in a lactate threshold test — what's your first interpretation? Drop it in the comments. --- 00:00 Something Dangerous About Lactate Testing 00:46 What the Right Shift Actually Means 01:18 Production vs. Combustion (VLamax vs. VO2max) 02:32 Two Reasons, Same Curve — Why That's a Problem 03:08 Why Sport Context Changes Everything 05:59 The Feedback Trap 07:36 The Hidden Decline 09:00 The HIIT Paradox 09:43 Test With Eyes Open #lactatethreshold #endurancecoaching #sportsscience #VLamax #INSCYD