SMD on %MVIC in the included articles, according to BMI, together with a summary of random effects meta-regression analysis.

The size of each circle is inversely proportional to weight to correspond to a random effects analysis. The transverse dotted line at 0 represents no difference. Reference numbers are shown. Note that articles by Laufer (2001) and Snyder-Mackler (1989) are not shown because of lack of BMI data. BMI: body mass index; SMD: standardized mean difference; MVIC: maximum voluntary isometric contraction.