Maximus Gage
Muscle protein synthesis (MPS) is a metabolic process that repairs muscle damage caused by intense exercise. It is a crucial process in muscle mass enhancement and is influenced by both exercise and nutrition. Resistance exercises, such as weightlifting, are particularly effective in stimulating MPS, leading to increased muscle growth and strength. The timing and type of protein consumed also play a significant role in enhancing MPS. For instance, consuming whey protein after resistance training increases amino acid concentrations, promoting lean muscle growth. Additionally, the amount of weight lifted during resistance exercises impacts MPS, with higher loads leading to greater muscle fibre recruitment. Understanding the factors influencing MPS is essential for developing effective strategies to increase muscle mass and improve athletic performance.
| Characteristics | Values |
|---|---|
| Resistance exercise | Increases muscle protein synthesis for up to 24 hours |
| Endurance exercise | Increases synthesis of mixed muscle proteins |
| Dietary amino acids | Increase in muscle protein synthesis, especially after resistance exercise |
| Timing of protein intake | Immediate post-exercise protein consumption is critical for increasing protein synthesis |
| Type of protein | Whey and soy protein increase lean mass and strength compared to a placebo |
| Leucine | A key anabolic amino acid |
| Carbohydrates | Carbohydrate and protein drink consumed before exercise may increase anabolic response |
| Insulin | Increasing insulin concentration inhibits muscle protein breakdown |
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What You'll Learn
Resistance training
Research shows that resistance training increases the rate of muscle protein synthesis, leading to muscle growth and repair. This is achieved through the activation and differentiation of muscle satellite cells, which fuse with existing muscle fibres to support greater protein synthesis. The load or mechanical strain imposed on the muscle fibres during resistance training is higher than that of endurance training, resulting in a more pronounced hypertrophic response.
The anabolic effect of resistance training can last for at least 24 hours, with a single bout of exercise stimulating muscle protein synthesis for up to 72 hours, peaking at 24 hours. However, it's important to note that the muscle protein synthesis response is smaller in trained individuals compared to untrained ones, as trained individuals experience less muscle damage. Additionally, the duration of the increase in muscle protein synthesis is similar in both trained and untrained subjects.
To maximise muscle protein synthesis and muscle hypertrophy, it is recommended to consume protein before or after resistance training. Protein supplementation pre- and post-workout increases physical performance, recovery, lean body mass, muscle hypertrophy, and strength. Consuming 3-4 grams of leucine is ideal for promoting maximum protein synthesis, and it should be combined with a fast-acting carbohydrate source like maltodextrin or glucose to enhance the synthesis process.
Furthermore, consuming 1.2-2.0 grams of protein per kilogram of body weight is recommended for building and maintaining muscle mass. For athletes, a common recommendation is 0.25 grams of high-quality protein per kilogram of body weight or an absolute dose of 20-40 grams. Distributing protein intake every 3-4 hours throughout the day can help maximise muscle protein synthesis.
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Timing of protein intake
The timing of protein intake is an important consideration for anyone looking to increase muscle protein synthesis. While the amount of protein consumed is crucial, the timing of consumption can also impact the rate of muscle protein synthesis.
Protein timing is a dietary strategy that involves consuming protein before, during, and after a training session. This strategy aims to facilitate muscular repair and remodelling, thereby enhancing post-exercise strength and hypertrophy. While the effectiveness of protein timing has been mixed in chronic training studies, it is generally accepted that protein timing has at least a small to moderate effect on gains in lean body mass.
Research suggests that consuming protein immediately after a workout stimulates protein synthesis, while delaying consumption by even two hours can blunt the response. In one study, participants who consumed 6 grams of essential amino acids post-exercise showed elevated protein synthesis compared to a control group. However, another study found no difference in protein synthesis rates when protein was consumed one or three hours post-exercise.
The type of protein consumed also plays a role in stimulating protein synthesis. For example, soy and whey protein supplementation have been shown to increase lean mass and strength compared to a placebo. Additionally, consuming a fast-acting carbohydrate source such as maltodextrin or glucose with the protein source can enhance protein synthesis, as leucine requires insulin to effectively modulate protein synthesis.
It is worth noting that muscle protein synthesis decreases overnight. Therefore, front-loading protein intake in the morning can stimulate muscle protein synthesis to a greater extent. Distributing protein intake evenly throughout the day, rather than concentrating it at lunch and dinner, can also maximise muscle protein synthesis.
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Types of protein
Muscle protein synthesis (MPS) is a metabolic process that describes the incorporation of amino acids into bound skeletal muscle proteins. Skeletal muscle is continually breaking down and synthesising protein. For muscle to maintain its mass, the net level of protein balance must equal zero. If the muscle is to gain mass, protein synthesis must exceed protein breakdown.
The main types of muscle protein fractions are myofibrillar proteins, mitochondrial proteins, sarcoplasmic proteins, and intramuscular connective tissue protein. Myofibrillar proteins contract and represent the majority of muscle mass. This fraction is highly relevant for building muscle mass and strength. Mitochondrial proteins, on the other hand, only represent a small part of the muscle. They are the powerhouses of the muscle, burning carbohydrates and fat for fuel. Therefore, mitochondrial protein synthesis is more informative about energy production capacity in the muscle and is more relevant for endurance athletes and metabolic health. Sarcoplasmic protein contains various organelles such as the endoplasmic reticulum and ribosomes. Finally, intramuscular connective tissue protein represents collagen protein in the muscle.
The type of protein consumed is an important factor in stimulating protein synthesis. Both soy and whey protein supplementation have been shown to increase lean mass and strength compared to a placebo. Whey protein, in particular, promoted greater intracellular signalling than soy protein. Additionally, soy and milk proteins have been shown to increase net protein balance in humans after resistance training.
The timing of protein consumption is also critical for increasing protein synthesis. Immediate post-exercise protein consumption stimulates protein synthesis, whereas delaying consumption by as little as 2 hours can blunt the response.
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Amino acid provision
Amino acids are the building blocks of muscle protein synthesis. They bind to skeletal muscle proteins and can lead to increased muscle size. The amino acids from protein are shuttled to the muscles, replacing any lost to exercise.
The provision of dietary amino acids increases skeletal muscle protein synthesis (MPS), an effect enhanced by prior resistance exercise. The combination of feeding and exercise is more anabolic than nutrition alone. The synergistic effects of amino acid provision and resistance exercise on skeletal muscle protein synthesis rates (MPS) are well-documented. Consuming dietary amino acids after resistance exercise stimulates an increase in MPS and is necessary to shift the net protein balance from negative (net protein loss) to positive (net protein gain).
The timing of protein consumption is critical for increasing protein synthesis. Immediate post-exercise consumption of protein stimulates protein synthesis, whereas waiting as little as 2 hours after exercise blunts the response. For example, Rasmussen et al. found elevated protein synthesis in those consuming 6g of essential amino acids post-exercise compared to a control group. Tipton et al. found a larger anabolic response when a carbohydrate and protein drink was consumed prior to exercise than if it were consumed immediately after exercise.
The type of protein consumed is also an important factor in stimulating protein synthesis. Both soy and whey protein supplementation have been shown to increase lean mass and strength in comparison to a placebo. Wilkinson et al. demonstrated both soy and milk protein’s ability to increase net protein balance in humans after resistance training. Consuming 20-40 grams of whey protein after resistance training also increased phenylalanine, leucine, and threonine concentrations, EAAs associated with lean muscle growth.
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Carbohydrates and protein
Muscle protein synthesis (MPS) is the driving force behind adaptive responses to exercise. It is a widely studied topic in the field of exercise and nutrition, with a focus on making muscles bigger.
Nutrient-driven increases in MPS are of finite duration (up to 1.5 hours), but this duration can be extended by resistance exercise (RE). RE stimulates a prolonged elevation of MPS that can remain elevated for at least 24 hours. The effect of RE on MPS is independent of the amount of weight lifted, but rather the muscle fibre recruitment.
The timing of protein consumption is critical for increasing MPS. Immediate post-exercise protein consumption stimulates MPS, while waiting for even 2 hours after exercise blunts the response. This is supported by studies that found elevated MPS in those consuming essential amino acids post-exercise.
The type of protein consumed is also important. Both soy and whey protein supplementation have been shown to increase lean mass and strength compared to a placebo. Additionally, whey and soy protein supplements promoted skeletal muscle protein synthesis more than a carbohydrate-only supplement.
There are valid reasons to include carbohydrates in protein supplements consumed after RE. Carbohydrates maximize glycogen restoration, especially when the time between exercise sessions is short. Fast-acting carbohydrates, such as glucose or maltodextrin, are recommended to be consumed with proteins after RE to promote muscle hypertrophy. The addition of carbohydrates to a protein supplement is believed to increase Lean Body Mass (LBM) to a greater extent than when protein is consumed alone. This is due to the synergistic effect of insulin and leucine on protein synthesis. However, there is limited clinical data to support these assumptions, and more studies are needed.
In summary, to increase muscle protein synthesis, it is important to combine RE with the consumption of protein sources, particularly soy and whey protein, and fast-acting carbohydrates. The timing of protein consumption is critical, with immediate post-exercise consumption being ideal.
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Frequently asked questions
Muscle protein synthesis (MPS) is the metabolic process that describes the incorporation of amino acids into bound skeletal muscle proteins.
Consuming dietary amino acids after resistance exercise stimulates an increase in MPS. The timing of protein consumption is critical for increasing protein synthesis. Consuming 20-40 grams of whey protein after resistance training can also increase muscle protein synthesis.
To stimulate muscle growth, you need to unsettle the protein balance. When MPS outpaces muscle protein breakdown (MPB), muscle growth is achieved.
Resistance exercise stimulates a prolonged elevation of MPS that can remain elevated for at least 24 hours. The greater the intensity of a workout, the greater the MPS.
