Amino acids - types, division, BCAA and EAA products
Classification of Amino Acids
Amino acids can be divided into three main groups:
Exogenous Amino Acids (EAA and BCAA)
Exogenous amino acids (essential) are those that our body cannot synthesize on its own, so they must be supplied with food. This group includes:
- Leucine
- Isoleucine
- Valine
- Lysine
- Methionine
- Phenylalanine
- Threonine
- Tryptophan
A lack of sufficient supply of exogenous amino acids in the diet can lead to serious disturbances in body functions, including muscle weakness and slowing down of regenerative processes.
Endogenous Amino Acids
Endogenous amino acids (non-essential) are compounds that our body is able to produce on its own. These include, among others:
- Alanine
- Aspartic acid
- Asparagine
- Cysteine
- Glutamine
- Glycine
- Proline
- Serine
- Tyrosine
Endogenous amino acids are extremely important for the proper functioning of the body; however, in situations of stress, illness, or intense effort, their amount may prove insufficient. In such cases, it is worth considering additional supplementation.
Conditionally Essential Amino Acids
Conditionally essential amino acids are a link between exogenous and endogenous amino acids. The body is able to synthesize them under normal conditions, but in certain circumstances (e.g., illness, heavy physical exertion), their production may not be enough. Conditionally essential amino acids include:
- Arginine
- Histidine
Why Are Amino Acids Important for Muscles?
Amino acids play a key role in the body's metabolic processes, especially in the context of building, regenerating, and functioning of muscles. Skeletal muscles, which are responsible for movement, strength, and endurance, consist mainly of proteins. These proteins, in turn, are built from amino acids, which act as basic building blocks.
Muscle Protein Synthesis
One of the most important processes in which amino acids participate is muscle protein synthesis (MPS). During intense physical activity, such as strength training, muscle fibers undergo micro-damage. Amino acids, supplied from food or supplements, are used to repair this damage, leading to muscle growth and strengthening. In particular, branched-chain amino acids, known as BCAA (leucine, isoleucine, valine), play a key role in stimulating anabolic processes.
Muscle Regeneration
Amino acids support not only muscle growth but also their regeneration after physical exertion. In the case of intense exercise, muscles are exposed to metabolic and physical stress, which can lead to their breakdown. Thanks to an adequate supply of amino acids, especially exogenous ones, repair processes are accelerated, shortening recovery time and reducing the risk of injury.
Protection Against Catabolism
In situations of energy deficit, e.g., during a weight loss diet or intense physical exertion, the body may draw energy from the breakdown of muscle proteins. This phenomenon, called muscle catabolism, is particularly unfavorable for those wishing to maintain muscle mass. Amino acids, especially leucine, act as anabolic signals that inhibit catabolic processes, thereby protecting muscles from degradation.
Transport and Energy Storage
Some amino acids, such as glutamine, are not only protein building blocks but also perform transport and energy functions. Glutamine is crucial for maintaining nitrogen balance in muscles, which has a direct impact on their efficiency and endurance. Additionally, amino acids participate in energy cycles, allowing for the maintenance of appropriate energy levels during intense effort.
BCAA Supplements — Key to Regeneration and Muscle Growth
BCAA (Branched-Chain Amino Acids) are amino acids with branched chains that are particularly important for physically active people. BCAAs consist of three exogenous amino acids: leucine, isoleucine, and valine. They are most quickly utilized by muscles during physical exertion.
Leucine
Leucine is the most important of the BCAA amino acids because it activates anabolic pathways in the body, supporting muscle protein synthesis processes. For this reason, leucine is key in the process of regeneration and building muscle mass.
Isoleucine
Isoleucine plays an important role in regulating blood glucose levels and participates in energy metabolism. It is also important for muscle regeneration after intense effort.
Valine
Valine is responsible for supporting muscle regeneration and protects them from excessive breakdown during prolonged effort. It is also significant for maintaining nitrogen balance in the body.
How Do BCAA Amino Acids Work?
Stimulation of Muscle Protein Synthesis
The most important task of BCAA, especially leucine, is the stimulation of muscle protein synthesis (MPS). Leucine activates mTOR (mechanistic Target of Rapamycin) pathways, which are responsible for initiating anabolic processes in muscles. This is a key mechanism for muscle growth after strength training or other intense physical exertion. Leucine is considered the strongest of the three BCAA amino acids in terms of the ability to initiate anabolic processes.
Prevention of Muscle Catabolism
BCAAs, especially in situations of increased physical exertion, have the ability to inhibit muscle catabolism. Catabolism is the process of muscle protein breakdown that can occur during periods of intense effort, stress, or when using restrictive diets when the body seeks alternative energy sources. By supplying BCAA amino acids, especially in the form of supplements, muscle tissue can be protected from breakdown, which is particularly beneficial for people aiming to maintain muscle mass during fat reduction.
Reduction of Fatigue During Physical Exertion
BCAA amino acids may influence the reduction of the feeling of fatigue during long-term physical exercises. They act at the level of the central nervous system, blocking the entry of tryptophan into the brain. Tryptophan is a precursor to serotonin, a neurotransmitter responsible for the feeling of fatigue. Less serotonin means a slower onset of the feeling of weariness, allowing for a longer and more effective workout.
Supporting Muscle Regeneration
Another significant aspect of BCAA action is their ability to accelerate regenerative processes. After intense physical exertion, muscles undergo micro-damage that must be repaired to grow. BCAA supplementation, both before and after training, can contribute to faster muscle regeneration, reducing delayed onset muscle soreness (DOMS) and improving the overall ability to return to training.
Increased Endurance and Improvement of Sports Results
Regular use of BCAA amino acids can lead to improved sports results, especially in the context of endurance. Thanks to protecting muscles from breakdown and stimulating anabolic processes, people supplementing BCAAs may notice an increase in strength, efficiency, and the ability to maintain a high training pace for longer.
How to dose BCAA? - visit our blog and expand your knowledge!
EAA Amino Acids — Full Support for the Body
EAA (Essential Amino Acids) is a group of essential amino acids that our body must obtain from food. As you may notice, the BCAA group is also included in EAA amino acids. EAA consists of all exogenous amino acids, i.e.:
- Leucine
- Isoleucine
- Valine
- Lysine
- Methionine
- Phenylalanine
- Threonine
- Tryptophan
How Do EAA Amino Acids Work?
Protein Synthesis and Muscle Building
The main function of EAA amino acids is their participation in protein synthesis. Proteins are the basic building blocks of muscles, enzymes, and many other tissues in the body. Without the full spectrum of exogenous amino acids, the protein synthesis process cannot proceed correctly, which limits muscle tissue growth and regeneration. Leucine, being one of the EAA amino acids, plays a key role in activating anabolic pathways, such as mTOR, which initiate muscle growth processes.
Support for the Nervous and Hormonal Systems
EAA amino acids, such as tryptophan and phenylalanine, are also precursors of key neurotransmitters and hormones. Tryptophan participates in the production of serotonin, which affects mood, sleep, and appetite, while phenylalanine converts into dopamine, a hormone responsible for motivation, concentration, and well-being. For this reason, exogenous amino acids play an important role not only in the context of physical health but also mental health.
Regulation of Metabolic Processes
EAA amino acids participate in many metabolic processes, including energy production and regulation of blood sugar levels. For example, isoleucine affects the improvement of insulin sensitivity and helps stabilize glucose levels, which is particularly important for physically active people and those struggling with metabolic problems. Methionine, in turn, participates in the synthesis of S-adenosylmethionine (SAM), a compound responsible for many methylation reactions that are important for detoxification and DNA synthesis.
Protection Against Muscle Catabolism
One of the significant aspects of EAA amino acids' action is their ability to prevent muscle catabolism. In situations of increased energy demand, such as intense physical exertion, the body may start using muscle proteins as an energy source. Providing a full spectrum of exogenous amino acids through diet or supplementation helps protect muscle tissue from degradation, which is particularly important during restrictive diets and long-term training.
Acceleration of Regeneration and Improvement of Efficiency
Regular supplementation with EAA amino acids affects the acceleration of muscle regeneration after physical exertion. Thanks to the presence of all necessary amino acids, the body has adequate resources to repair micro-damage to muscle fibers, resulting in a faster return to form and reduced feeling of fatigue after training. Additionally, EAA supplementation can support overall physical efficiency, allowing for longer and more intense training sessions.
Optimization of Body Composition
EAA amino acids can also influence the improvement of body composition by supporting fat burning processes and building lean muscle mass. Acting as anabolic substrates, EAAs support muscle tissue development, which in turn accelerates the metabolic rate. Thanks to this, the body burns calories more efficiently, leading to fat tissue reduction while maintaining muscle mass.
BCAA vs EAA Dietary Supplements — What to Choose?
The choice between BCAA and EAA supplementation depends on individual needs and training goals. Here are a few points that may help in making a decision:
- BCAA are more focused on muscle regeneration after intense training and support muscle protein synthesis thanks to the presence of leucine.
- EAA provide a full spectrum of exogenous amino acids (including BCAA), making them a more comprehensive solution, especially for people on a low-protein diet or training at a higher intensity level.
When to Use BCAA and When EAA?
- BCAA are particularly recommended before, during, and after intense training to support muscle regeneration and prevent their breakdown.
- EAA are worth using daily, regardless of training, to provide the body with a full range of amino acids necessary for proper functioning.
Summary
Amino acids are key elements in muscle building and body regeneration. Supplementation with amino acids such as BCAA and EAA can significantly contribute to improving sports results and accelerating regenerative processes. Both BCAA and EAA have their place in the diet of physically active people, and their choice depends on individual needs and training goals.
Bibliography:
- Effects of EAA amino acids on skeletal muscle:
See study (PMC10561576) - Impact of amino acids on the organism:
See publication ScienceDirect - Effect of BCAA amino acids on muscle protein synthesis:
See study (PMC5568273)
Recommended
