Figure 8From: Early motor learning changes in upper-limb dynamics and shoulder complex loading during handrim wheelchair propulsion Differences between initially fast improvers (n = 7; IFI; green) and initially slow improvers (n = 8; ISI, red). Only mechanical efficiency shows a significant interaction effect between Initially Slow Improvers (ISI) and Initially Fast Improvers (IFI) over practice time (T1-T3).Back to article page