For trained male powerlifters, lifting lighter weights for more repetitions leads to the same increase in chest size as lifting heavier weights for fewer repetitions, as long as the total work and...
Mechanism
Synthesis from 1 study
When powerlifters train with either light weights and many reps or heavy weights and few reps — as long as they do the same total work and push to near failure — their chest muscles grow the same amount because both methods turn on the muscle’s protein-making machinery and recruit all the muscle...
Most probable mechanism
When trained lifters do many reps with light weights or few reps with heavy weights, as long as they push close to failure and do the same total work, their chest muscles grow similarly because both methods stress the muscle in ways that turn on protein-making machines inside muscle cells and recruit more muscle fibers to work — this is shown in 10.3390/app15041974.
High-repetition, low-load bench press sets induce metabolic stress (e.g., lactate accumulation, muscle acidosis) in type II muscle fibers, activating mechanotransduction and metabolic signaling pathways including mTORC1, which upregulates ribosomal RNA synthesis and increases translational capacity for muscle protein synthesis — supported by 10.3390/app15041974.
Sustained metabolic stress and mechanical tension from both low-load high-volume and high-load low-volume protocols enhance recruitment of high-threshold motor units through increased afferent feedback and central drive, ensuring sufficient mechanical tension is applied to muscle fibers regardless of load — supported by 10.3390/app15041974.
Increased ribosomal content and motor unit recruitment collectively elevate the rate of myofibrillar protein synthesis, leading to net accretion of contractile proteins and hypertrophy of the pectoralis major, as evidenced by comparable increases in chest circumference between training protocols — supported by 10.3390/app15041974.
Evidence from Studies
Supporting (1)
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