IEEE J Biomed Health Inform - Inverse estimation of multiple muscle activations from joint moment with muscle synergy extraction.

Tópicos

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Resumo

Human movement is produced resulting from synergetic combinations of multiple muscle contractions. The resultant joint movement can be estimated through the related multiple-muscle activities, which is formulated as the forward problem. Neuroprosthetic applications may benefit from cocontraction of agonist and antagonist muscle pairs to achieve more stable and robust joint movements. It is necessary to estimate the activation of each individual muscle from desired joint torque(s), which is the inverse problem. A synergy-based solution is presented for the inverse estimation of multiple muscle activations from joint movement, focusing on one degree-of-freedom tasks. The approach comprises muscle synergy extraction via the nonnegative matrix factorization algorithm. Cross validation is performed to evaluate the method for prediction accuracy based on experimental data from ten able-bodied subjects. The results demonstrate that the approach succeeds to inversely estimate the multiple muscle activities from the given joint torque sequence. In addition, the other one's averaged synergy ratio was applied for muscle activation estimation with leave-one-out cross-validation manner, which resulted in 9.3% estimation error over all the subjects. The obtained results support the common muscle synergy-based neuroprosthetics control concept.

Resumo Limpo

human movement produc result synerget combin multipl muscl contract result joint movement can estim relat multiplemuscl activ formul forward problem neuroprosthet applic may benefit cocontract agonist antagonist muscl pair achiev stabl robust joint movement necessari estim activ individu muscl desir joint torqu invers problem synergybas solut present invers estim multipl muscl activ joint movement focus one degreeoffreedom task approach compris muscl synergi extract via nonneg matrix factor algorithm cross valid perform evalu method predict accuraci base experiment data ten ablebodi subject result demonstr approach succeed invers estim multipl muscl activ given joint torqu sequenc addit one averag synergi ratio appli muscl activ estim leaveoneout crossvalid manner result estim error subject obtain result support common muscl synergybas neuroprosthet control concept

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