Fig. 8

The tuning curves of the synergy activation profiles as a function of end-point forces. The tuning curves are projected on the horizontal (medial(M)-lateral(L) & forward(F)-backward(B)), frontal (M-L & upward(U)-downward(D)), and sagittal plane (F-B & U-D). The set of five synergies in the “Habitual” condition in pre- and post-training (Week 0 and Week 6, respectively) and in the “As-Trained” condition in pre-training included: elbow flexor (E Flex; BRD, BI, and PECT), elbow extensor (E Ext; TRIlong and TRIlat), shoulder adductor/flexor (S Add/Flex; AD, MD, PECT, and UpTrp), shoulder abductor/extensor (S Abd/Ext; MD, PD, and TRIlong), and scapula retractor (Sc Ret; MidTrp, LowTrp, and InfSp). The set of five synergies activated in the “As-Trained” condition in post-training included: a combination of BRD and S Add/Flex (BRD-S Add/Flex), BI dominant E Flex with minor PECT (BI-E Flex), E Ext, S Abd/Ext, and Sc Ret. A and B, The tuning curves in “Habitual” and “As-Trained” assessment conditions, respectively