Article Series

The Best Athlete is a Smart Athlete

Take a deep dive into the world of sports science. Our article series provides you with the latest information from top scientists around the world.

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the size principle

How Muscles Contract: The Size Principle

The size principle means that motor units (motor neuron and muscle fibers innervated by it) are activated in an order from smallest to largest.

all-or-none law

How Muscles Contract: The All-Or-None Law

The all-or-none law states that if a stimulus exceeds an activation threshold, all the muscle fibers in a motor unit are simultaneously activated, and at full force.

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