In people who lift weights, whether they are beginners or experienced, creatine supplementation leads to similar increases in lean muscle mass, and the level of training experience does not...
Mechanism
Synthesis from 1 study
Creatine helps muscles make energy faster and signals them to grow bigger, and this works well whether someone is new to lifting or has been lifting for years. Even though experienced lifters might absorb creatine a bit better or have muscles that respond more, these advantages don’t consistently...
Most probable mechanism
When someone takes creatine, their muscles store more of it, which helps them make energy faster during workouts. This lets them lift heavier or do more reps, putting more stress on the muscles. The extra creatine also pulls water into the muscle cells, which signals the cells to build more protein. This process turns into bigger muscles over time, and it works similarly whether someone is new to lifting or has been lifting for years.
Oral creatine supplementation increases intramuscular creatine and phosphocreatine stores
Elevated phosphocreatine enables faster regeneration of ATP during high-intensity resistance exercise, increasing work capacity and mechanical tension on muscle fibers
Creatine uptake increases cellular hydration, which activates the mTOR signaling pathway
mTOR activation upregulates ribosomal biogenesis and protein translation, increasing muscle protein synthesis
Net accumulation of muscle protein contributes to increased fat-free mass
Less supported by current evidence, but not ruled out
People who have trained longer may absorb creatine better because their muscles have more transporters and respond more strongly to growth signals, and they tend to have more fast-twitch muscle fibers that grow bigger with creatine.
Chronic resistance training upregulates creatine transporter expression and improves insulin sensitivity, enhancing creatine uptake into muscle cells
Trained individuals have a higher proportion of fast-twitch muscle fibers, which are more responsive to mechanical tension and anabolic signaling
Trained individuals exhibit greater satellite cell activation and higher training volumes, amplifying the anabolic stimulus
These factors collectively increase the potential for muscle protein accretion in trained individuals
Evidence from Studies
Supporting (1)
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Creatine supplementation and resistance training: a comparison between novice and experienced lifters - a systematic review and dose-response meta-analysis
Contradicting (0)
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