Fig. 7

Changes in the activation profile of muscle synergies during six weeks of training. A, Group mean (n = 10) activation coefficients of five synergies calculated for each target of the “Habitual” condition of the assessment. Five muscles synergies that composed the habitual muscle synergy set (see Fig. 5A) included (1) elbow flexor (E Flex; BRD, BI, and PECT), (2) elbow extensor (E Ext; TRIlong and TRIlat), (3) shoulder adductor/flexor (S Add/Flex; AD, MD, PECT, and UpTrp), (4) shoulder abductor/extensor (S Abd/Ext; MD, PD, and TRIlong), and (5) scapula retractor (Sc Ret; MidTrp, LowTrp, and InfSp). B, Group mean (n = 10) activation coefficients of muscle synergy set obtained during the “As-Trained” condition of the assessment which included new synergy sets from Week 2: (1) combination of BRD and S Add/Flex (BRD-S Add/Flex), (2) BI dominant E Flex with minor PECT (BI-E Flex), (3) E Ext, (4) S Abd/Ext, and (5) Sc Ret (see Fig. 5B).