The dosage for both exercise regimes required maximal muscle activation of the patient because it was shown that at this dosage the emphasized exercise results in muscle activation of about 20% to 25% MVC (Maximum Voluntary Contraction) and the general exercise of about 50% MVC (Schomacher et al., 2015). Patients were asked therefore to perform the exercises at their individual maximal force for a short time without provoking any pain neither during nor after the exercise. That is, submaximal effort without evoking pain during and after the exercises was used.