Running Glossary

Critical Speed

Running Glossary

Critical Speed

Running Glossary

Critical Speed

Critical Speed

[krit-i-kuhl speed]

Phonetic (Standard)

/ˈkrɪtɪkəl spiːd/

IPA

Noun

The speed at which an athlete can sustain exercise without fatigue over a prolonged period, representing the threshold between aerobic and anaerobic energy systems.

Critical Speed (CS) is the highest running speed a runner can maintain indefinitely without fatigue. It represents the threshold between sustainable and unsustainable effort. CS is determined through time trials or specific tests and is crucial for pacing strategies. For example, if a runner's CS is 5 m/s, they can sustain this pace for extended periods. Understanding CS helps runners optimize training, improve endurance, and set realistic race goals. It matters because training at or near CS can enhance aerobic capacity and delay fatigue, crucial for long-distance events.

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