Want this question answered?
Fast twitch muscle fibres are ones used for sudden bursts of physical activity, such as sprinting or weight lifting. Slow twitch muscle fibres meanwhile are designed for extended periods of contraction, such as keeping a person's head supported or maintaining a standing posture. Physiological differences between the two fibres are largely down to their different energy requirements. Slow twitch fibres have more surrounding capillaries, more mitochondria and a larger amount of myoglobin within the muscle (causing them to be red in color). Meanwhile fast twitch fibres have a store of glycogen to provide a quick burst of energy when the muscles come into action.
Yes. Sprinting requires that you access the fast twitch mucsle fibers in your body. By running long slow distance, your fast twitch muscles are never trained for what they are supposed to do consequently, you will not be able to sprint as fast.
They are different type of muscle fibres (US spelling Fibers). Fast twitch are good at contracting fast but fatigue quickly. Slow twitch contract more slowly but do not fatigue as fast. In athletes, sprinters tend to have a dominance of slow twitch fibres while insurance competitors have a dominance of slow twitch.
Type IIa Red fibers. Fast oxidative (also called fast twitch A or fatigue resistant fibers). Contain:Large amounts of myoglobin.Many mitochondria.Many blood capillaries.High capacity for generating ATP by oxidation. Split ATP at a very rapid rate and, hence, high *contraction velocityResistant to fatigue but not as much as slow oxidative fibers.Needed for sports such as middle distance running and swimming.Type IIb White. Fast glycolytic (also called fast twitch B or fatigable fibers). Contain:Low myoglobin content.Few mitochondria.Few blood capillaries.Large amount of glycogen.Split ATP very quickly.Fatigue easily.Needed for sports like sprinting.Hope it is useful to you!
Generally not as there are many parallel fibres that are part of the same circuit and some sort of coordination between the fibres are needed before a muscle twitch can be detected. This is either temporal or spatial summation.
type 1 slow twitch fibres
Fast-twitch fibers can deliver a quick burst of power. Slow-twitch fibers can maintain a contraction for a longer time. Because of the higher energy demands of slow-twitch fibres (due to their more frequent and prolonged usage) they have a higher density of mitochondria for energy and myoglobin to provide oxygen. Meanwhile, fast-twitch fibres tend to have larger stores of glycogen so that vast quantities of energy can be provided at short notice.
Fast-twitch fibers can deliver a quick burst of power. Slow-twitch fibers can maintain a contraction for a longer time. Because of the higher energy demands of slow-twitch fibres (due to their more frequent and prolonged usage) they have a higher density of mitochondria for energy and myoglobin to provide oxygen. Meanwhile, fast-twitch fibres tend to have larger stores of glycogen so that vast quantities of energy can be provided at short notice.
Type I (red) muscle fibers, which have slow oxidative characteristics, are those primarily called on for long-distance running. These are more commonly referred to as 'slow-twitch' muscle fibers.
ofcourse not; slow twitch muscle fibers are: * smaller in diameter * red in color * depend on oxidative phosphorylation for their ATP supply * are highly vascularized (better blood supply) * have more mitochondria * more myoglobin fast twitch muscle fibers * larger * white * glycolysis is the source of ATP * less vascularized * less mitochondria * less myoglobin
a increase in cross sectional area of fast twitch muscle fibres
Slow-twitch