What fitness test is used to measure muscle fiber type?

The fitness test commonly used to measure muscle fiber type is the Wingate anaerobic test. This test assesses anaerobic power and capacity by having participants perform a 30-second all-out sprint on a cycle ergometer against a fixed resistance. The output is measured in terms of peak power and mean power, which can help infer the ratio of fast-twitch to slow-twitch muscle fibers. Additionally, muscle biopsies can be conducted to directly analyze fiber type composition.