Figure 2From: Vastus medialis motor unit properties in knee osteoarthritis Distribution of S-MUP amplitudes expressed as total number per bin at 20% MVC for control (open bars) and OA (solid bars) participants. It appears that the OA participants had a greater number of relatively large S-MUPs, signifying a tendency towards increased MU size. S-MUP: surface motor unit action potential; MU: motor unit.Back to article page