Not all sets count the same—sets that directly target the muscle you're measuring matter more, and a method that gives partial credit to indirect sets works best for predicting results.
Scientific Claim
The distinction between direct and indirect resistance training sets improves the accuracy of predicting muscle hypertrophy and strength outcomes, with the 'fractional' quantification method showing the strongest evidence.
Original Statement
“The relative evidence for the 'fractional' quantification method was strongest; therefore, this quantification method was used for the primary meta-regression models.”
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 describes a methodological comparison and statistical preference, which is appropriately stated as an association based on model fit, not causation.
Evidence from Studies
Supporting (1)
The Resistance Training Dose Response: Meta-Regressions Exploring the Effects of Weekly Volume and Frequency on Muscle Hypertrophy and Strength Gains.
This study found that counting different types of exercises in a smarter way—giving partial credit to exercises that work a muscle indirectly—makes it easier to predict how much muscle and strength you’ll gain. The best way to do this was using the 'fractional' method, which the study says works better than other ways.