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There is no proven way to gain muscle fibers. Some research has shown that through intense explosive exercises VERY FEW slow twitch fibers will be converted to fast twitch. Other research, shown only in ANIMAL testing, has suggested that super high weight and low rep (1-3) will actually CREATE NEW fast twitch muscle fibers. But your pre-existing fast twitch muscle fibers can gain massive increases in size through explosive exercises. Examples of these exercises would be sprints, high weight low rep resistance training, and Olympic lifts.

Remember, there is no proven way for HUMANS to actually gain new muscle fibers.

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16y ago

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Why do slow twitch muscle fibers have more mitochondria compared to fast twitch muscle fibers?

Slow twitch muscle fibers have more mitochondria compared to fast twitch muscle fibers because they rely more on aerobic metabolism for energy production, which requires a higher number of mitochondria to generate ATP efficiently.


Why do slow twitch muscle fibers have more mitochondria than fast twitch muscle fibers?

Slow twitch muscle fibers have more mitochondria than fast twitch muscle fibers because they rely more on aerobic metabolism to produce energy for sustained, endurance activities. Mitochondria are the powerhouse of the cell and are responsible for producing energy in the form of ATP through aerobic respiration. Since slow twitch fibers require more sustained energy production, they have more mitochondria to support this process compared to fast twitch fibers, which rely more on anaerobic metabolism for quick bursts of energy.


Which muscle fibers are best suited for running a marathon?

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.


What are slow twitch muscle fibers?

Our bodies are made up of different types of muscle fibers, all of which rely on different energy systems. Slow twitch fibers, as the name suggests, contract more slowly than fast twitch muscle fibers and they can contract for a longer period of time. We often call these 'endurance' muscles because they're great for aerobic activities that require endurance like running, cycling and swimming. In general, many of us will have about 50% slow twitch fibers and 50% fast twitch fibers, although it will differ between individuals. Successful long-distance runners will often have more slow twitch fibers while sprinters or bodybuilders will often have more fast twitch fibers. Strength training in different rep ranges (from 4-16) will allow you to work different muscle fibers and energy systems in your body.


What is the difference between fast twitch and slow twitch muscle fibers?

Fast twitch muscle fibers are Type II muscle fibers. These muscle fibers have high explosive power and are anaerobic. They have a fast contractile speed and can reach peak tension in 50ms. They have a high glycolytic capacity and have low to moderate resistance to fatigue. Their motor unit strength is high.Slow twitch muscle fibers are Type I muscle fibers. These muscle fibers have steady power and are aerobic. The have a slow contractile speed and needs 110ms to reach peak tension. They have a low glycolytic capacity and a high resistance to fatigue. Their motor unit strength is low.


What fibers are slow twitch fibers?

Our bodies are made up of different types of muscle fibers, all of which rely on different energy systems. Slow twitch fibers, as the name suggests, contract more slowly than fast twitch muscle fibers and they can contract for a longer period of time. We often call these 'endurance' muscles because they're great for aerobic activities that require endurance like running, cycling and swimming. In general, many of us will have about 50% slow twitch fibers and 50% fast twitch fibers, although it will differ between individuals. Successful long-distance runners will often have more slow twitch fibers while sprinters or bodybuilders will often have more fast twitch fibers. Strength training in different rep ranges (from 4-16) will allow you to work different muscle fibers and energy systems in your body.


What are the two main muscule fiber types are called?

The two main muscle fiber types are slow-twitch (Type I) fibers and fast-twitch (Type II) fibers. Slow-twitch fibers are better for endurance activities as they are more resistant to fatigue, while fast-twitch fibers are better suited for explosive, powerful movements.


Which kind of muscle fibers contract rapidly?

Fast-twitch muscle fibers contract rapidly due to their ability to generate high levels of force quickly. They are more suited for activities requiring short bursts of power, such as sprinting or weightlifting.


What is the difference between fast-twitch and 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


What type of muscle fibers are found in higher proportion in weight lifters?

Type II (fast-twitch) muscle fibers are found in higher proportion in weight lifters. These fibers generate more force and are associated with explosive movements and short bursts of intense activity.


What type of fibers are present in supraspinatus and infraspinatus muscles?

The supraspinatus muscle contains mostly type I (slow-twitch) muscle fibers, which are more fatigue-resistant and used for sustained contractions. The infraspinatus muscle contains a mix of type I and type II (fast-twitch) muscle fibers, which are used for more powerful and quick contractions.


What is a physical activity that is short explosive and depends solely on the enegry that is stored in a musle and not on oxygen intake?

You are thinking of muscle fibers types. Skeletal muscle fibers are grossly divided into two type; slow twitch (type I) and fast twitch (type II).Slow twitch fibers are capable of continuous extended contractions and therefore, do not fatigue quickly. Fast twitch fibers are used for short rapid bursts of energy and as such fatigue more quickly than slow twitch fibers.