It is true that slow twitch muscle fibers have a high resistance to fatigue.
Skeletal muscle is consists of hundreds or thousands of individual muscle fibers called myocytes which are bundled together. Each myocyte contains several myofibrils. Myofibrils are strands of protein that grab and pull each other. When this happens, the muscle shortens and this causes the muscle to contract.
Endurance and Speed
Slow twitch muscle fibers are great for endurance activities like long distance running, swimming and cycling. They can work for a long period of time without fatigue. While Fast twitch muscle fibers are great for rapid activities like sprinting to catch the bus or jumping to steal a ball. They contract quickly but get fatigued quickly for they consume lots of energy.
Slow twitch and fast twitch muscle fibers create energy in different ways
Red is the color of the muscle that contains a lot of slow twitch fibers because they have a large number of blood vessels. Slow twitch muscle depends on a rich supply of oxygen in the blood. They use this oxygen to create energy for muscle contraction.
Fast twitch muscle fibers do not use oxygen thus do not rely on the blood supply. Instead, they use anaerobic metabolism to create energy. They are lighter in color than slow twitch muscle fibers.
Anaerobic metabolism is the production of energy via burning of carbohydrates without the presence of oxygen.
Summary
Slow Twitch Muscle Fibers
Fast Twitch Muscle Fibers
Keywords: muscle, muscle fiber, slow twitch, fast twitch
It is true that slow twitch muscle fibres have significant levels of fatigue resistance. Type I fibres, usually referred to as slow-twitch muscle fibres, are designed specifically for endurance exercises.
These muscles can withstand fatigue better than other muscle fibres because they are built to contract slowly and consistently for an extended length of time. Myoglobin and mitochondria, two substances that help produce energy and are essential for endurance activities, are abundant in slow twitch fibres.
In order to assist the muscle fibres get oxygen and other nutrients, slow twitch fibres also have a lot of capillaries. As a result, the muscle may exert itself for extended periods of time before becoming fatigued.
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The 4 × 400 metres relay or long relay is an athletics track event in which teams consist of four runners who each complete 400 metres or one lap
Explanation:
Four athletes each complete one 400m lap. The first lap is run in designated lanes, as is the second – until the beginning of the back straight.