The Claim
In untrained young men, type I muscle fibers exhibit higher mitochondrial density than type II fibers at baseline, and this difference remains following 10 weeks of resistance training despite overall mitochondrial expansion.
What the research says
Not yet evaluated
We are still looking at what the research says.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In young men who don't exercise, slow-twitch muscle fibers have more energy-producing parts than fast-twitch fibers to start with, and even after 10 weeks of weight training—which boosts these parts overall—the slow-twitch ones still keep their lead.
See the scientific wording
Type I muscle fibers in untrained young men have higher mitochondrial density than type II fibers at baseline, and this difference persists after 10 weeks of resistance training despite overall mitochondrial expansion.
Score breakdown, mechanism chain, raw evidence, ideal studies needed
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.