Before revision:  Conclusions: We showed the potential of tensor factorisations to study and characterise muscle activity and developed a new direct method for shared and task-specific synergy identificationwith a constrained Tucker decomposition. Significance: We expect that this study will pave the way for the development of  muscle activity analysis methods based on higher-order techniques.
After revision:  Conclusions: We showed the potential of tensor factorisations to study and characterise muscle activity and developed a new direct method for shared and task-specific synergies identification. We expect that this study will pave the way for the development of muscle activity analysis methods based on higher-order techniques.