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What is the difference between fast-twitch and slow-twitch muscles?

Fast-twitch muscles are used in quick, forceful muscle contractions such as sprinting or power lifting. Slow-twitch muscles are used in endurance activities such as long-distance running or biking.

(This answer provided for NATA by the Gustavus Adolphus College Athletic Training Education Program.)

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.