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Effects of body weight support and guidance force settings on muscle synergy during Lokomat walking

Abstract : 1 Abstract Team lifting is a complex and collective motor task that possesses both motor and cognitive components. The purpose of this study was to investigate to what extent the biomechanics of a collective load carriage is affected when a dyad of individuals is performing a carrying task with an additional accuracy constraint. Ten dyads performed a first condition in which they collectively transported a load (CC), and a second one in which they transported the same load while maintaining a ball in a target position on its top (PC). The recovery-rate, amplitude, and period of the center-of-mass (COM) trajectory were computed for the whole system (dyad + table = PACS). We analyzed the forces and moments exerted at each joint of the upper limbs of the subjects. We observed a decrease in the overall performance of the dyads when the Precision task was added, i.e., i) the velocity and amplitude of CoM PACS decreased by 1,7% and 5,8%, respectively, ii) inter-subject variability of the Moment-Cost-Function decreased by 95% and recovery rate decreased by 19,2% during PC. A kinetic synergy analysis showed that the subjects reorganized their coordination in the PC. Our results demonstrate that adding a precision task affects the economy of collective load carriage. Notwithstanding, the joint moments at the upper-limbs are better balanced and co-vary more across the paired subjects during the precision task. Our study results may find applications in domains such as Ergonomics, Robotics-developments, and Rehabilitation.
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Contributor : Nicolas Turpin Connect in order to contact the contributor
Submitted on : Tuesday, August 17, 2021 - 6:49:20 AM
Last modification on : Tuesday, October 19, 2021 - 5:56:40 PM




Yosra Cherni, Maryam Hajizadeh, Fabien Dal Maso, Nicolas Turpin. Effects of body weight support and guidance force settings on muscle synergy during Lokomat walking. European Journal of Applied Physiology, Springer Verlag, 2021, ⟨10.1007/s00421-021-04762-w⟩. ⟨hal-03321064⟩



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