Research confirms that any rep range between 6 and 30 produces identical muscle hypertrophy provided the set is taken within 0 to 3 reps of momentary muscular failure.
1. Effective Reps Concept
The Final 4–5 Reps Before Failure: Involuntary slowdown in bar velocity recruits high-threshold Type II motor units via Henneman's size principle.
- 0 RIR (Absolute Failure): Maximizes mechanical stimulus but inflicts higher central nervous system fatigue.
- 1–2 RIR (Optimal Stimulus-to-Fatigue): Delivers 98%+ of maximum hypertrophy stimulus with 40% less systemic fatigue.