Fig. 6
Effect sizes of the changes in measures of spinal excitability ordered by age group and number of training sessions. Open symbols: p > 0.05. Filled symbols: p < 0.05. N.A. indicates data necessary to calculate effect sizes were not available. The subgroup analysis was not significant for the spinal excitability measures and only included 7 studies; we therefore performed a systematic synthesis of the adaptations in spinal excitability in response to balance training in all available studies. Note how the increase in the number of balance training sessions is not accompanied by a dose-dependent increase in the effect sizes