FIG. 2.

Forest plots for meta-analyses on effects of acute exercise on (a) AEA and (b) 2-AG concentrations (pmol/mL). Note: some articles reported effects in different samples separately (e.g., PTSD and healthy control groups); therefore, these articles are entered more than once in the meta-analysis and treated as separate subgroups. The total effects (bottom) are reported on a different scale than the study effects. Individual studies show mean difference scores and the pooled results show weighted mean differences and 95% confidence intervals. The size of the block indicates the weight assigned to that study in the meta-analysis and the horizontal line depicts the confidence interval. Thus, larger block sizes indicate studies with larger weight (typically with narrower confidence intervals), which contribute more to the calculation of the summary result. The summary result is presented as a diamond at the bottom. The total around that diamond is circled to draw attention to the total effect. 2-AG, 2-arachidonoylglycerol; AEA, anandamide; PTSD, post-traumatic stress disorder.