Knowledge

Knowledge Base

Key concepts and best practices in performance diagnostics and metabolic testing.

Featured

Why VO2 Testing — What Your Watch Can't Tell You

Heart rate zones are guesses. VO2 testing shows what's actually happening inside your body. Here's why it matters for every endurance athlete.

Diesel vs. Sprinter — Two Athlete Types, One Test

Some athletes burn fat efficiently at high intensities. Others depend on carbs from the start. A metabolic test reveals which type you are — and how to train accordingly.

FatMax - Maximum Fat Oxidation

Finding the intensity where your body burns the most fat.

Metabolic Training Zones

From fat burning to VO2max - training with metabolic precision.

Power Meter Integration in Metabolic Testing

Why power data is essential for accurate metabolic analysis.

RER - Respiratory Exchange Ratio

The metabolic fingerprint that reveals your fuel mix.

Why Slow Endurance Training Makes You Faster

The science behind long, slow distance training. Why 80% of your training should feel too easy - and how to find the right intensity.

Best Practices for Spiroergometry

Where to get a spiroergometry test, what it costs, how to prepare, and how to do it yourself with portable equipment.

Common Problems from Training in the Wrong Zones

Achilles tendon pain, chronic fatigue, stagnating performance - often caused by wrong training intensity.

How OpenSpiro calculates VO2 (and what to watch out for)

A long read for VO2 analyzer nerds: the Haldane transformation, wet- vs dry-basis bookkeeping, how OpenSpiro calculates VO2 with the OSM1, and the sensor realities that make or break your readings.

VO2max - Maximum Oxygen Uptake

The gold standard of cardiorespiratory fitness.

VO2max Reference Values by Age and Gender

Comprehensive VO2max normative data tables based on ACSM guidelines, broken down by age, gender, and fitness level.