Figure 3. Effect of 80 minute practice time on the mechanical efficiency (mean and standard-error of multi-level model) for both groups between the pre- and posttest.

While controlling for the nature of the intervention the n = 26 IFI (>10%) started with a lower mechanical efficiency but benefitted more from the intervention and had a higher mechanical efficiency in the posttest compared to the n = 13 ISI (≤10%).