Our muscles are made up of slow twitch (type 1) fibers and fast twitch (type II) fibers.
On average our bodies have about 50% slow, and 50% fast twitch fibers. The difference between the two types influences how our muscles respond to different types of physical activity.
Slow Twitch Fibers:-
fuel at a slower pace, and can go for longer periods of time before they fatigue. These muscle fibers use oxygen (aerobic) to generate more fuel and muscle contractions are long and continuous.
Therefore, if you are long distance running for a marathon, or biking for hours then you are using your slow twitch muscle fibers.
Fast Twitch Fibers:-
use anaerobic (without the use of oxygen) metabolism to generate fuel and are used for short bursts of strength or speed. They fatigue at a faster pace, and examples of using fast twitch fibers are sprinting, weight training.
Hope you get a better understanding of what muscles you are using when performing certain activities. Stay tuned for methods of training to work and develop the two types of muscle fibers.
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