Logan Steele
There is a popular belief in the fitness industry that muscle fibres grow back larger after being damaged. This has led to the idea that muscle damage is necessary for hypertrophy. However, this is a myth, as muscle growth is a complex physiological response to mechanical stress or tension, and there are many factors that mediate the hypertrophic process. While muscle damage can occur as a result of strength training, it is not a direct and necessary consequence of the mechanical tension behind hypertrophic responses.
| Characteristics | Values |
|---|---|
| Muscle damage | It is a popular idea that muscle fibers grow back larger after being damaged. |
| Muscle growth | Muscle hypertrophy is a complex physiological response to different forms of mechanical stress or tension. |
| Micro tears | During intense resistance training, muscle fibers experience tiny tears or damage, triggering the body to repair and rebuild these fibers, leading to muscle growth. |
| Muscle soreness | Bodybuilders have traditionally linked muscle soreness and hypertrophy, believing that muscles must be damaged before they can grow. |
| Muscle protein turnover | Muscle protein turnover is increased after damaging workouts, with increased muscle protein synthesis and breakdown rates. |
| Muscle inflammation | Eccentric training, which produces more muscle damage than other types of muscular contraction, may stimulate more muscle growth than other types of training. |
| Satellite cell activity | Satellite cell activity is often elevated when muscles are damaged, and increases in the number of nuclei inside each muscle fiber are likely necessary for long-term hypertrophy. |
| Calcium ions | Repeated contractions under fatiguing conditions release intracellular calcium and inflammatory neutrophils, which degrade the inside of the fiber. |
| Mechanical tension | Mechanical tension is considered a primary driver of hypertrophy and occurs during both isotonic and isometric muscle contractions. |
| Metabolic stress | The accumulation of metabolites such as lactate during resistance training is another contributor to muscle growth. |
| MuSCs | MuSCs are muscle satellite cells that are essential for generating new myofibers during regeneration and the increase in new myonuclei during hypertrophy. |
| Degenerative damage | Degenerative damage to myofibers during muscle injury or upon hypertrophy is believed to trigger the activation and proliferation of MuSCs. |
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What You'll Learn
Micro tears and hypertrophy
The idea that micro-tears in muscles are the primary cause of muscle growth, or hypertrophy, has been a pervasive myth in the fitness industry for years. Many gym-goers and even some fitness professionals have accepted this idea, attributing post-workout soreness to microscopic tears in muscle fibres. However, the scientific understanding of muscle growth is more complex, and the relationship between muscle damage and hypertrophy is more nuanced than the micro-tears hypothesis suggests.
Muscle hypertrophy is a complex physiological response to different forms of mechanical stress or tension, such as resistance training. The two primary forms of hypertrophy are myofibrillar hypertrophy and sarcoplasmic hypertrophy. In myofibrillar hypertrophy, the myofibrils within muscle fibres split and then grow, increasing the number of contractile units and enabling the muscle to exert greater force. While the number of myofibrils can vary, the number of muscle fibres remains relatively constant. Sarcoplasmic hypertrophy, on the other hand, involves an increase in the volume of fluid and non-contractile elements within the muscle fibre or cell.
The micro-tears hypothesis suggests that during intense resistance training, muscle fibres experience tiny tears or damage, triggering the body to repair and rebuild these fibres, leading to muscle growth. However, there is no evidence to suggest that mechanical tension causes micro-tears. While strenuous exercise can cause microscopic muscle damage, this damage is chemically mediated rather than mechanical tearing, and it occurs in the days following exercise. Additionally, studies indicate that muscle damage does not consistently correlate with muscle growth. For example, eccentric contractions, which are associated with increased muscle damage, do not always result in greater hypertrophy compared to concentric contractions.
While micro-tears may not be the primary trigger of hypertrophy, muscle damage can still play a role in the process. Exercise-induced muscle damage (EIMD) occurs primarily from performing unaccustomed exercises, with the severity depending on the type, intensity, and duration of training. EIMD can have detrimental short-term effects on performance and pain, but the associated skeletal muscle inflammation and increased protein turnover may be necessary for long-term hypertrophic adaptations. The structural changes associated with EIMD may influence gene expression, resulting in strengthened tissue and protection against further injury. Additionally, muscle damage and repair can activate and proliferate muscle satellite cells (MuSCs), which are important for generating new myofibers during regeneration and hypertrophy.
In conclusion, while micro-tears may not be the sole or primary cause of hypertrophy, they may still play a role in the complex process of muscle growth. It is important to move beyond fitness myths and understand the intricacies of muscle physiology to achieve muscle growth goals effectively and safely.
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Muscle damage and muscle growth
However, this is not necessarily the case. While muscle damage can contribute to hypertrophy, it is not the sole driver. For example, eccentric contractions, which cause more muscle damage than other types of muscular contraction, do not always result in greater hypertrophy compared to concentric contractions. Studies have shown that muscle damage does not consistently correlate with muscle growth.
The process of muscle growth is a complex physiological response to different forms of mechanical stress or tension, such as resistance training. Mechanical tension is considered a primary driver of hypertrophy and occurs during both isotonic and isometric muscle contractions. Metabolic stress, the accumulation of metabolites such as lactate during resistance training, is also a contributor to muscle growth.
Research has shown that muscle protein turnover is increased after damaging workouts, which may be mediated by inflammatory or calcium ion-related signalling. Eccentric training, which produces more muscle damage, may stimulate more muscle growth than other types of training. Satellite cell activity is also often elevated when muscles are damaged, and increases in the number of nuclei inside each muscle fibre are likely necessary for long-term hypertrophy.
However, muscle damage is not necessary for muscle growth. Muscle damage can be seen as a passenger in the hypertrophic process, with microscopic damage being a by-product of strenuous exercise rather than a direct and necessary consequence of the mechanical tension behind hypertrophic responses.
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Exercise-induced muscle damage
The greatest damage to muscle tissue occurs with eccentric exercise, where muscles are forcibly lengthened. Concentric muscle contractions do not cause EIMD, but it is evident after isometric contractions at a long muscle length and eccentric muscle contractions, even at low intensity. Damage can range from specific macromolecules of tissue to large tears in the sarcolemma, basal lamina, and supportive connective tissue, as well as injury to contractile elements and the cytoskeleton.
There are several treatments for EIMD, including nutritional and pharmacological interventions, electrical and manual therapies, and exercise. Long-term supplementation with antioxidants or beta-hydroxy-beta-methylbutyrate can reduce EIMD, as can the ingestion of protein before and after exercise. Massage, cold-water immersion, and wearing compression garments may also aid recovery.
While EIMD and hypertrophy are related, the relationship is complex and not fully understood. It has been hypothesised that the skeletal muscle inflammation and increased protein turnover associated with EIMD are necessary for long-term hypertrophic adaptations. This hypothesis suggests that the structural changes associated with EIMD influence gene expression, resulting in strengthened tissue and protection against further injury. However, this theory has been questioned, as hypertrophy can occur without significant muscle damage. Research has shown that muscle damage does not consistently correlate with muscle growth, and eccentric contractions, often associated with increased muscle damage, do not always result in greater hypertrophy compared to concentric contractions.
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Muscle repair and rebuilding
The idea that muscle damage is necessary for hypertrophy is a popular belief in the fitness industry. This theory suggests that muscle fibres experience tiny tears or damage during intense resistance training, triggering the body to repair and rebuild these fibres, leading to muscle growth. However, recent research has questioned this hypothesis, indicating that muscle damage does not consistently correlate with muscle growth. For example, eccentric contractions, which are associated with increased muscle damage, do not always result in greater hypertrophy compared to concentric or isometric contractions.
While muscle damage may not be the sole driver of hypertrophy, it can interact with other factors to contribute to muscle growth. Muscle damage can increase muscle protein turnover, leading to increased protein synthesis and breakdown rates. Additionally, eccentric training, which causes more muscle damage, may stimulate more muscle growth than other types of training. Satellite cell activity, which is often elevated when muscles are damaged, is also believed to play a role in long-term hypertrophy.
It is important to note that muscle damage should not be the primary goal of strength training. While it may occur as a result of intense exercise, proper programming, nutrition, and recovery are crucial for achieving muscle growth and preventing injury. The repair process after muscle damage involves oxidative stress, an inflammatory response, and anabolic signalling in the mTOR pathway, which can occur without subsequent hypertrophy. Therefore, while muscle damage may interact with other factors to contribute to hypertrophy, it is not the sole or necessary driver of muscle growth.
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Muscle stem cell behaviour
Skeletal muscle is a dynamic tissue with two unique abilities. Firstly, it has an excellent regenerative ability due to the activity of skeletal muscle-resident stem cells, called muscle satellite cells (MuSCs). Secondly, it can adapt its myofiber size in response to external stimulation, intrinsic factors, or physical activity, which is known as plasticity. MuSCs are essential for generating new myofibers during regeneration and the increase in new myonuclei during hypertrophy.
However, there has been little investigation of the molecular mechanisms underlying MuSC activation, proliferation, and differentiation during hypertrophy. While MuSCs are indispensable for muscle repair and regeneration, their contributions to atrophy and hypertrophy are still controversial.
One reason is that degenerative damage to myofibers during muscle injury or upon hypertrophy is believed to trigger similar activation and proliferation of MuSCs. However, evidence suggests that degenerative damage to myofibers is not necessary for MuSC activation and proliferation during hypertrophy.
Research has shown that the relationship between muscle damage and hypertrophy is more nuanced than the micro-tears hypothesis suggests. Studies indicate that muscle damage does not consistently correlate with muscle growth. For example, eccentric contractions, which are often associated with increased muscle damage, do not always result in greater hypertrophy compared to concentric contractions.
Therefore, muscle damage should be seen as more of a passenger in the hypertrophic process rather than the driver, with microscopic damage being a by-product of strenuous exercise rather than a direct and necessary consequence of the mechanical tension behind hypertrophic responses.
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Frequently asked questions
It is a popular belief in the fitness industry that muscle fibres grow back larger after being damaged. However, this is a myth. While muscle damage can contribute to muscle growth, it is not necessary for hypertrophy to occur.
Muscle hypertrophy is the process of muscle growth. It is a complex physiological response to different forms of mechanical stress or tension, such as resistance training.
The two primary forms of hypertrophy are myofibrillar hypertrophy and sarcoplasmic hypertrophy. Myofibrillar hypertrophy involves an increase in the number and size of muscle myofibrils, giving us more contractile units and the ability to exert greater force. Sarcoplasmic hypertrophy involves an increase in the volume of fluid and non-contractile elements within the muscle fibre or cell.
The micro tears hypothesis suggests that during intense resistance training, muscle fibres experience tiny tears or damage, triggering the body to repair and rebuild these fibres, leading to muscle growth. However, there is no evidence to support this theory, and studies have shown that muscle damage does not consistently correlate with muscle growth.
Several factors contribute to muscle hypertrophy, including mechanical tension, metabolic stress, and muscle damage. Mechanical tension refers to the force exerted on muscle fibres during physical activity and is considered a primary driver of hypertrophy. Metabolic stress, such as the accumulation of lactate during resistance training, is also believed to contribute to muscle growth.
