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why are slow-twitch muscles more beneficial than fast-twitch muscles for cardiorespiratory fitness?
Slow-twitch muscles are more beneficial than fast-twitch muscles for cardiorespiratory fitness because Slow-twitch fibers have a very good blood supply - so much so that they are often referred to as red fibers. This plentiful supply of blood ensures that slow-twitch fibers receive a large amount of oxygen, which allows them to work for a long time before becoming fatigued. In contrast,
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Updated 8/5/2013 12:43:30 AM
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Slow-twitch muscles are more beneficial than fast-twitch muscles for cardiorespiratory fitness because Slow-twitch fibers have a very good blood supply - so much so that they are often referred to as red fibers. This plentiful supply of blood ensures that slow-twitch fibers receive a large amount of oxygen, which allows them to work for a long time before becoming fatigued. In contrast, fast-twitch fibers have a relatively poor blood supply and are subsequently referred to as being white in color. The lack of blood results in relative oxygen restriction, so fast-twitch fibers tend to fatigue much faster than the better oxygenated slow-twitch fibers.

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