mechanistic
Analysis v1
Strong Support
Your muscles use smaller, less powerful fibers first when you start moving, and only bring in the bigger, stronger fibers when you need more power or get tired.
20
0
Evidence from Studies
Supporting (1)
20
Community contributions welcome
20
Relationships between motor unit size and recruitment threshold in older adults: implications for size principle
Cross-Sectional Study
Human
2009 AugThe study looked at how muscles activate fibers in older people and found that smaller fibers still get used first, just like the claim says, so it supports the idea.
Contradicting (0)
0
Community contributions welcome
No contradicting evidence found
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.