In untrained young men, two different ways of organizing resistance training workouts—either doing four sets of ten reps or eight sets of five reps, with the same total workload and rest time—lead to...
Mechanism
Synthesis from 1 study
When beginners lift weights with the same total workload, it doesn’t matter if they do four big sets or eight smaller ones—both ways create enough force on the muscles to make them grow and enough brain signaling to make them stronger, so outcomes are the same (10.3389/fphys.2023.1301535).
Most probable mechanism
When untrained men lift weights with the same total weight and rest time, whether in four big sets or eight smaller ones, their muscles grow and get stronger because the force on the fibers and the brain's ability to activate them are similar in both cases — studies show muscle thickness and strength increase equally regardless of how the sets are split (10.3389/fphys.2023.1301535).
Resistance exercise generates mechanical tension across muscle fibers during concentric and eccentric contractions at 70–75% 1RM, activating intracellular anabolic signaling pathways regardless of set structure (10.3389/fphys.2023.1301535).
Mechanical tension and metabolite accumulation trigger mTORC1 signaling, increasing ribosomal biogenesis and myofibrillar protein synthesis to build new muscle tissue, with no difference in outcomes between set structures despite differing metabolic stress levels (10.3389/fphys.2023.1301535).
Repeated contractions recruit low- and high-threshold motor units according to Henneman’s size principle, with neural adaptations—including increased firing rate, synchronization, and reduced inhibition—enhancing voluntary force production without requiring muscle failure (10.3389/fphys.2023.1301535).
Increased maximal strength from neural and structural adaptations shifts the force-velocity curve upward, enabling greater power output at submaximal loads during dynamic movements like the back squat, with no difference between set structures (10.3389/fphys.2023.1301535).
Net accumulation of myofibrillar proteins increases muscle fiber cross-sectional area and fat-free mass, while enhanced motor unit recruitment elevates maximal strength and muscular endurance, with both outcomes matching between traditional and rest-redistributed protocols (10.3389/fphys.2023.1301535).
Evidence from Studies
Supporting (1)
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Effect of resistance training programs differing in set structure on muscular hypertrophy and performance in untrained young men
Contradicting (0)
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