The Claim
Forty percent of highly cited meta-analyses in the field of strength and conditioning used unweighted averages to combine study results rather than weighting studies by their precision, leading to potential distortion of results by assigning equal importance to studies of differing sample sizes and methodological quality.
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.
In fitness research, nearly half of the big summary studies ignored how reliable each individual study was and treated them all the same — even tiny, shaky studies got the same weight as big, solid ones, which can mess up the final conclusion.
See the scientific wording
40% of highly cited meta-analyses in strength and conditioning failed to weight studies by their precision, instead using unweighted averages, which can distort results by giving equal importance to small and large studies.
What the research says
1 studyThe study found that many top strength and conditioning meta-analyses made big math mistakes, like treating small and big studies the same — which is exactly what the claim says happens. So even though it didn’t count the exact 40%, it shows the problem is real and widespread.
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.