Physiology

Exercise physiology involves the study of the acute responses and chronic adaptations to exercise. Humans aren’t machines—we’re much more complicated.

From anaerobic threshold to environmental acclimatization, from FTP to PGC-1 alpha, we explore the science of human performance.

Latest: Page 3

Xert software analyzing interval data

One Workout — Many Responses

In this workshop, Dr. Stephen Cheung uses Xert software to illustrate how a single workout can impact athletes differently depending on their phenotype.
heart cardiovascular drift

Cardiovascular Drift, with Dr. Ed Coyle

Cardiovascular drift is an instability in heart rate and stroke volume over time. On the bike, we measure it by looking at a rise in heart rate relative to power. We dive in.
FTP Testing

Structured Workout: 20-Minute FTP Test

Are you ready to suffer? Join us for a climbing time trial up the infamous Alpe du Zwift during which we'll execute an FTP test.
lactate molecule lactic acid

The Lactic Acid Myth

There is no lactic acid in the human body. That said, the burn we feel during hard efforts has a lot to do with acid. We explain.