Only five small studies were used, with just 120 people total — so the results are too shaky to be very confident about.
Scientific Claim
The meta-analysis included only five studies with 120 total participants, resulting in low statistical power and high uncertainty in estimating true effects on muscle fiber hypertrophy.
Original Statement
“A total of ten study groups were included in the meta-analysis. The pooled number of participants in all included studies was 120. Study samples ranged from 14 to 49 participants (median: 17 participants).”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The claim is a factual description of the number of studies and participants, directly drawn from the study’s reporting. No overstatement is present.
Evidence from Studies
Supporting (1)
The Effects of Low-Load Vs. High-Load Resistance Training on Muscle Fiber Hypertrophy: A Meta-Analysis
The study found that it’s unclear whether light or heavy weights build muscle better because the results are all over the place — this means the data isn’t strong enough to be sure, just like the claim says.