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The genetics of Endurance and Power

There are two types of skeletal muscle fibers in the human body – slow-twitch or Type 1 or Red muscles and fast-twitch or Type 2 or White muscle.

The fast-twitch contract with more force and many times faster than do slow-twitch ones. However, the fast-twitch ones fatigue more quickly.

Each of these muscle types can be further broken down into subcategories, depending on contractile speed, force and fatigue resistance. Type 2B fast-twitch fibers, for example, have a faster contraction time than type 2A.


Xcode is a pioneer in personal genomics, focussed on enabling personalized preventive healthcare. We are dedicated to empowering physicians, wellness professionals and customers with the most validated, accurate and actionable genomic information to positively impact and improve their client’s health and quality of life.

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