Figure 1: Effect size (Cohen’s d), with corresponding 95% confidence intervals, is shown for the twelve resistance training programs, stratified by training stimulus: isotonic, elastic, isometric and isokinetic. The boundaries of effect size are identified: α – “small” effect (d=0.20); δ – “medium” effect (d=0.50); φ – “large” effect (d=0.8). The data for male cohort extension strength in the study Mansell et al. [11] has been excluded from the analysis due to a large decrease in extensor strength following the training program for which the authors do not provide an explanation.