The Claim
Bioelectrical impedance analysis cannot detect changes in fat-free mass during resistance training interventions in adults with overweight or obesity, even when clinically relevant strength gains are observed.
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.
Bioelectrical impedance analysis does not detect changes in fat-free mass during resistance training in adults with overweight or obesity, even when strength improves significantly.
See the scientific wording
Bioelectrical impedance analysis is insufficiently precise to detect changes in fat-free mass during resistance training interventions in adults with overweight or obesity, as evidenced by lack of significant differences despite clinically relevant strength gains.
When someone does resistance exercises, their nerves learn to activate more muscle fibers at the same time and fire them faster, making the muscles stronger without making them bigger. Because the muscle doesn't grow in size, tools that measure body composition by electrical signals can't detect any change in muscle mass, even though the person gets much stronger.
What the research says
1 studyEven though people got stronger from doing resistance exercises, the device used to measure muscle mass didn't show any increase — suggesting the device isn't precise enough to catch small muscle changes during weight loss.
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.