Figure 4.

Summary of exercise parameters. X-axis: total duration of exercise program (in weeks), frequency of exercise sessions (number of days per week), duration of exercise sessions (in minutes per session), and intensity of exercise sessions in each study included in this review. Left Y-axis: exercise duration and frequency. Right Y-axis: exercise intensity (1: very light, 2: light, 3: moderate, 4: hard, 5: very hard, and 6: maximum) (adapted from ACSM's guidelines for exercise testing and prescription, 9th edition, 2013) [55]. The measures of dispersion (mean and standard deviations) of exercise parameters are indicated by the horizontal lines transecting the data points.