The Claim
The heterogeneity of effects on type I muscle fiber hypertrophy was low (I² = 18%), and type II muscle fiber hypertrophy showed no heterogeneity (I² = 0%), indicating consistent effect sizes across included studies despite variations in sample size and methodology.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Studies on muscle growth showed consistent results for both type I and type II muscle fibers, with little variation in how much they grew across different research designs and sample sizes.
See the scientific wording
The heterogeneity of effects on type I fiber hypertrophy was low (I² = 18%), while type II fiber hypertrophy showed no heterogeneity (I² = 0%), suggesting that the included studies produced consistent results despite small sample sizes and methodological variability.
When muscles are worked until they can't move anymore, the body uses all its muscle fibers, no matter if the weight is light or heavy. This full use of fibers creates similar levels of stress and chemical signals in both slow-twitch and fast-twitch fibers, causing them to grow at the same rate.
What the research says
1 studyEven though the studies used different methods and small groups of people, they all found pretty much the same result: light and heavy weights grow muscle fibers similarly. This means the findings are surprisingly consistent.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.