Lifting heavy weights with longer breaks between sets helps build muscle strength better than lifting lighter weights with shorter breaks, especially for guys who already work out.
Evidence from Studies
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Contradicting (1)
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The impact of repetition mechanics on the adaptations resulting from strength-, hypertrophy- and cluster-type resistance training
The study tested exactly the same workouts as described in the claim: strength training with 4 sets of 6 reps at 85% max lift and long rest, cluster training with 4 sets of 6/1 reps at 90% max lift and very long rest, and hypertrophy training with 5 sets of 10 reps at 70% max lift and short rest. All were done by trained men for 6 weeks. The results showed that strength and cluster training led to bigger strength gains than hypertrophy training, which matches the claim.
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