
Muscle growth, or hypertrophy, is the process by which muscles increase in size. This can be achieved through strength training, which increases the protein content and volume of individual muscle fibres. The fibres can increase in length or diameter, and the arrangement of fibres inside the muscle can alter after training. The angle of the fibres relative to the line of pull, known as the pennation angle, also increases as fibre diameter increases. In addition, muscles may increase in size in some regions more than others, depending on the type of exercise used in training.
| Characteristics | Values |
|---|---|
| Muscle fibres can split | This may be a useful adaptation or a side effect of severe muscle damage |
| Muscle growth | Can be measured by increases in the protein content and volume of individual muscle fibres |
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What You'll Learn
- Muscle growth can occur when the protein content of individual muscle fibres increases, causing them to increase in diameter or length
- The angle of muscles relative to the line of pull (the pennation angle) increases as fibre diameter increases
- Muscles increase in size in some regions more than others, depending on the exercise used in training
- Strenuous strength training can cause muscle fibres to split and multiply
- Diet can also play a role in muscle growth, with extra energy being used to rebuild and grow muscle after workouts

Muscle growth can occur when the protein content of individual muscle fibres increases, causing them to increase in diameter or length
The increase in protein content leads to an increase in volume, resulting in muscle fibres becoming larger in diameter or length. This growth can occur through strength training, which stimulates the rebuilding and growth of muscle fibres. The specific exercises used in training can also influence the regions of the muscle that increase in size the most, as muscles have functional subdivisions.
Additionally, the angle relative to the line of pull, known as the pennation angle, increases as fibre diameter increases. This contributes to the overall growth and development of the muscle.
While muscle growth can occur through an increase in protein content, it is important to note that the process is complex and influenced by various factors. The splitting of muscle fibres has also been observed, particularly after strenuous strength training programs, but the impact of this on long-term muscle growth is still unclear.
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The angle of muscles relative to the line of pull (the pennation angle) increases as fibre diameter increases
It is unclear whether muscle fibres split to multiply or if this is a side effect of severe muscle damage. However, it is known that muscle fibres can increase in volume, either by increasing in diameter or cross-sectional area, or by increasing in length.
Magnetic resonance imaging (MRI), computed tomography (CT), and ultrasonography can give us an insight into how individual muscles change in size, in each of their dimensions. Combining multiple axial scans along the length of the muscle allows researchers to calculate whole muscle volume. This type of measurement is useful because it does not matter whether individual muscle fibres increase in length or diameter, nor whether the arrangement of the fibres inside the muscle alters after training.
To increase muscle volume, your body uses extra energy to rebuild and grow muscle after workouts. You can use a formula to calculate the number of calories you need to take in daily to gain one pound of muscle per week.
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Muscles increase in size in some regions more than others, depending on the exercise used in training
Increases in the protein content (and therefore the volume) of individual muscle fibres can occur because they increase in diameter or cross-sectional area, or they increase in length. The way in which muscles change in size in each of their dimensions can be observed through scanning methods such as magnetic resonance imaging (MRI), computed tomography (CT), and ultrasonography.
However, it is important to note that muscles do not increase in size in all directions equally after strength training, which affects how we interpret the results of each scanning measurement. Multiple axial scans done along the length of the muscle produce a series of cross-sectional images, which can be combined to calculate whole muscle volume. This type of measurement is useful because it does not matter whether individual muscle fibres increase in length or diameter, nor whether the arrangement of the fibres inside the muscle alters after training.
To support muscle growth, it is important to consider your nutritional intake. Your body uses extra energy to rebuild and grow muscle after workouts, so you may need to increase your calorie intake to support this process.
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Strenuous strength training can cause muscle fibres to split and multiply
Muscle growth can be measured using magnetic resonance imaging (MRI), computed tomography (CT), and ultrasonography. These methods can give an insight into how individual muscles change in size, in each of their dimensions. When multiple axial scans are done along the length of the muscle, this produces a series of cross-sectional images. Combining these together allows researchers to calculate whole muscle volume. This type of measurement is useful because it does not matter whether individual muscle fibres increase in length or diameter, nor whether the arrangement of the fibres inside the muscle alters after training, nor whether different regions of the muscle increase in size more than others.
Increases in the protein content (and therefore the volume) of individual muscle fibres can occur because they increase in diameter or cross-sectional area, or they increase in length. The angle relative to the line of pull (called the pennation angle) increases in conjunction with increases in fibre diameter. Many muscles increase in size in some regions more than others, depending on the exercise used in training, because they have functional subdivisions, each of which is best-suited to producing force.
To build muscle, your body uses extra energy to rebuild and grow muscle after workouts. Sports dietitian Leslie Bonci recommends using a formula to calculate the number of calories you need to take in daily to gain one pound a week.
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Diet can also play a role in muscle growth, with extra energy being used to rebuild and grow muscle after workouts
Diet can play a significant role in muscle growth. After a workout, your body uses extra energy to rebuild and grow muscle. This is where diet comes in.
To support muscle growth, it is important to increase your calorie intake. Sports dietitian Leslie Bonci recommends increasing your calorie intake by 500 a day if you haven't gained weight in two weeks. This can be calculated using a formula that takes into account your weight, basic calorie needs, resting metabolic rate, and the type and duration of your workouts.
In addition to increasing calorie intake, it is important to focus on consuming adequate protein. Protein is essential for muscle growth as it increases the protein content of individual muscle fibres, leading to an increase in their volume. This can occur through an increase in the diameter or cross-sectional area of the fibres, or through an increase in their length.
It is worth noting that muscles do not increase in size equally in all directions after strength training. This affects how we interpret scanning measurements, such as MRI, CT, and ultrasonography. Combining multiple axial scans along the length of the muscle allows researchers to calculate whole muscle volume, which is a more accurate representation of muscle growth.
While diet and nutrition are crucial, it is also important to understand that muscle growth is a complex process that involves various factors, including the type of exercise, the angle of muscle contraction, and the functional subdivisions of the muscle.
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Frequently asked questions
Muscles multiply when fibres split.
The new fibres are often smaller than the older ones.
No, fibres also split when muscles experience contusions that do not stimulate muscle growth.
Yes, researchers have observed signs of fibre splitting after strenuous programs of voluntary strength training.
No, there is no solid indication that long-term strength training causes increases in muscle fibre number.

































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