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What are type I muscle fibers?

Grant Cooper, MD
Physical Medicine & Rehabilitation
Type I muscle fibers are slow-twitch, small muscle fibers used for carrying light loads over long distances. These fibers have increased resistance to fatigue, and are well suited for activities related to physical effort requiring strength and endurance.
The Arthritis Handbook: Improve Your Health and Manage the Pain of Osteoarthritis (A DiaMedica Guide to Optimum Wellness)

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The Arthritis Handbook: Improve Your Health and Manage the Pain of Osteoarthritis (A DiaMedica Guide to Optimum Wellness)

According to conventional wisdom, arthritis pain is an inevitable part of aging. Not so, says Dr. Grant Cooper in this practical, accessible guide. For those who do develop osteoarthritic conditions,...
Marjorie Nolan Cohn
Nutrition & Dietetics
Type I muscle fibers are considered slow Twitch muscle fibers. The slow muscles are more efficient at using oxygen to generate more fuel (known as ATP) for continuous, extended muscle contractions over a long time. They fire more slowly than fast twitch fibers and can go for a long time before they fatigue. Therefore, slow twitch fibers are great at helping athletes run marathons and bicycle for hours.

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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.