Branched-Chain Amino Acids (BCAAs) is a collective term for leucine (Leu), isoleucine (Ile), and valine (Val), which have similar branched structures and share similar pathways for breakdown and metabolism. The metabolism of BCAAs is closely associated with athletic performance, which is why BCAAs have been increasingly recognized and extensively studied as a sports nutrition supplement in recent years.
The metabolism of branched-chain amino acids (BCAAs)
The metabolism of branched-chain amino acids (BCAAs) in the human body is as follows: BCAAs cannot be synthesized or converted from other substances within the human body. Their synthesis is limited to plants and microorganisms. Therefore, the human body can only obtain BCAAs from food, making them essential amino acids. The breakdown of BCAAs begins by the action of the same transaminase, which generates three corresponding keto acids. This reaction is reversible. Subsequently, under the action of decarboxylase, these keto acids undergo oxidative decarboxylation to form the corresponding fatty acyl-CoA with one less carbon atom. Leucine is further degraded into acetyl acetate and acetyl-CoA, isoleucine is degraded into propionyl-CoA and acetyl-CoA, and valine is degraded into succinyl-CoA. These products participate in gluconeogenesis and ketogenesis processes, entering the tricarboxylic acid cycle.
The breakdown metabolism of branched-chain amino acids (BCAAs) is highly active in muscle. Organs such as the liver and kidneys have a high activity of BCAA-degrading enzymes, allowing them to utilize branched-chain amino acids. The metabolic products of BCAAs, glucose, and ketone bodies, are both energy sources that the body can utilize. Therefore, BCAAs are important amino acids involved in functions during prolonged and continuous physical activity.
BCAA impact on protein metabolism
The supplementation of branched-chain amino acids (BCAAs) has been found to have an impact on protein metabolism. During prolonged endurance exercise, there is an imbalance in energy requirements. In order to meet the demand for glucose by skeletal muscles and the brain, protein breakdown metabolism is enhanced. However, supplementing BCAAs to individuals engaged in physical activity can help counteract the effects of exercise on protein metabolism. Researchers used isotope tracking techniques with 15N-glycine and 3H-leucine to investigate the uptake of BCAAs and their role in protein synthesis in the heart and skeletal muscles of mice during exercise. The results showed a significant increase in the uptake of BCAAs from the bloodstream into the heart and skeletal muscles during exercise, while the levels of BCAAs in the blood serum decreased. Therefore, it is believed that exercise accelerates cardiac protein metabolism, but supplementing BCAAs mitigates the impact of exercise on cardiac protein metabolism, promoting skeletal muscle protein synthesis or reducing protein breakdown.
BCAA impact on glucose
Among all the sources of energy, glucose stands out due to its fast energy supply, ability to provide both anaerobic and aerobic energy, and other advantages. Maintaining blood glucose levels within a normal range during exercise directly affects athletic performance. In addition to the traditional approach of increasing glycogen reserves before and during exercise to prolong the decline in blood glucose levels, supplementing with BCAAs can indirectly replenish glucose. Supplementing BCAAs promotes the circulation of the alanine-glucose cycle and accelerates gluconeogenesis.
BCAA Impact on Central Nervous System (CNS)
The impact of BCAA supplementation on central nervous system (CNS) fatigue in exercise is complex. One of the factors contributing to CNS fatigue is the alteration of neurotransmitter levels caused by exercise. 5-HT, an important inhibitory neurotransmitter in the CNS, is primarily derived from tryptophan metabolism. Tryptophan and BCAAs are transported across the blood-brain barrier by the same carrier, and they compete for binding to the carrier. When branched-chain amino acid levels increase, competition inhibits tryptophan from entering the brain. Qiu Zhuojun demonstrated that supplementation of BCAA + CHO during a 3-week endurance training period in rats can prevent the downregulation of 5-HT receptor density caused by endurance exercise, thus positively contributing to delaying CNS fatigue.
The impact on exercise-induced fatigue
The peripheral mechanisms contributing to exercise-induced fatigue are diverse. After exhaustive exercise, the levels of free radicals increase in the body, while the activity of antioxidant enzymes that counteract free radicals also increases, leading to fatigue and changes in function. When experimental rats were given branched-chain amino acids (BCAAs) for 30 days, during the recovery phase after exhaustive exercise (immediately after exercise, post-exercise, and post-post-exercise), lipid peroxidation (LPO) significantly decreased, and the activities of antioxidant enzymes superoxide dismutase (SOD) and glutathione peroxidase (GSH-PX) significantly increased compared to the control group. Therefore, it can be concluded that BCAA supplementation is beneficial for reducing free radicals and increasing the activity of antioxidant enzymes after exercise, thus playing a certain role in the recovery from exercise-induced fatigue.
Levels of mitochondrial lipid peroxidation and membrane fluidity can reflect mitochondrial function from different aspects. Changes in membrane fluidity after exercise indicate the impact of exercise on membrane damage, and the decrease in membrane fluidity will inevitably cause changes in membrane function, thereby affecting exercise capacity. Supplementing BCAAs can restore mitochondrial lipid peroxidation levels and membrane fluidity to levels similar to those of the normal group. The study by Jin Hong demonstrated that BCAAs can effectively protect the stability of the lipid bilayer in mitochondrial membranes, inhibit the increase of lipid peroxidation in skeletal muscle mitochondrial membranes, and prevent the decrease in membrane fluidity after acute exercise in rats. This ensures the normal biological function of mitochondrial membranes and reduces exercise-induced fatigue, thereby improving exercise capacity.
HSF Biotech Branched-Chain Amino Acid (BCAA)
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