A comprehensive review of 111 studies found that resistance training consistently adds an average of 1.53 kg of muscle mass, regardless of the load used. This extensive research, involving 158 groups and 1927 participants, clarifies the relationship between hypertrophy and strength gains.
A critical tension emerges: muscle hypertrophy can occur independent of resistance training load, but a significant dose-response relationship dictates muscle strength development. This challenges traditional training philosophies.
Therefore, individuals seeking maximal strength gains must prioritize higher-load training. Those focused solely on muscle size, however, have more flexibility in their load choices, provided they train to volitional fatigue.
The Surprising Flexibility of Muscle Growth
- Muscle hypertrophy occurred independent of resistance training (RT) load, according to sciencedirect.
- Training with low-loads (30-60% 1RM) can result in similar hypertrophy to training with moderate and high-loads (>60% 1RM) when volitional fatigue occurs, according to maximizing muscle hypertrophy: a systematic review of advanced ....
For muscle growth alone, the intensity of the load is less critical than the effort to volitional fatigue. This provides significant flexibility for individuals with physical limitations or those prioritizing aesthetic muscle size without heavy lifting.
Strength's Unyielding Demand for Higher Loads
In contrast to hypertrophy, a significant dose-response for muscle strength was identified (p < 0.01), according to a systematic review with meta-analysis of the effect of resistance .... This means strength gains are directly proportional to training intensity.
Further analysis revealed a plateau in muscle strength at 887,000 arbitrary units (au) for chest strength and 773,000 arbitrary units (au) for quadriceps strength. A plateau in muscle strength at 887,000 arbitrary units (au) for chest strength and 773,000 arbitrary units (au) for quadriceps strength demonstrates measurable limits to progress.
