Five muscle groups (tibialis anterior, soleus, gluteus medius, adductor magnus, and lower erector spinae) demonstrated high correspondence between the model-constructed synergy and live EMG data.
Muscle Group (Stimulated by Single Channel) Primary Anatomical Actions Soleus, Gastrocnemius Ankle plantar flexion Tibialis Anterior Ankle dorsiflexion Vasti (Medialis, Intermedius, Lateralis) Knee extension Adductor Magnus Hip extension, hip adduction Gluteus Maximus Hip extension Gluteus Medius Hip abduction Semimembranosus Hip extension, hip adduction Erector Spinae Trunk extension Muscle Group SCI Joint Moment (Stimulated by Single Channel) (N-m) * Soleus, Gastrocnemius 55 Tibialis Anterior 15 Vasti (Medialis, Intermedius, Lateralis) 80 Adductor Magnus 63, 30 Gluteus Maximus 63 Gluteus Medius 44 Semimembranosus 63, 30 Erector Spinae 70 Muscle Group Optimal/Maximal (Stimulated by Single Channel) Excitation Level [dagger] Soleus, Gastrocnemius 0.
As for hamstring benefit (determined by the percentage of feasible postures when the gluteus maximus was excluded), we found that the adductor magnus provided the most benefit, followed by the semimembranosus, biceps femoris, and semitendinosus.
167 ([double dagger])  Adductor Magnus (posterior) 0.
The gluteus maximus and adductor magnus were divided into a superior and inferior portion, and the gluteus medius was divided into an anterior and posterior portion.
This was not true in the case of the adductor magnus and the gluteus medius, however.
In a previous study, the adductor magnus was included on the assumption that it would be used in coronal plane posture shifts .