The authors have analyzed the role of biarticular muscles during the act of arising from a chair by trying to understand the differences found in maximum hip contact pressures between standing up, stair-climbing and level walking. They have found that despite its energy cost, cocontraction is normal in all these activities, with the simultaneous hip and knee extension explained by biarticular muscle action, Lombard's paradox, and the respective muscle lever arms. Furthermore, cocontraction is used when a joint must be stiffened, as, for example, in preparing to absorb an abrupt load such as heel strike.
ARISING FROM A CHAIR: THE ROLE OF BI-ARTICULAR MUSCLES IN RESOLVING LOMBARD'S PARADOX / Catani, Fabio. - (1987), pp. 1713-1714. (Intervento presentato al convegno Proceedings of the Ninth Annual Conference of the IEEE Engineering in Medicine and Biology Conference. tenutosi a Boston, MA, USA, nel na).
ARISING FROM A CHAIR: THE ROLE OF BI-ARTICULAR MUSCLES IN RESOLVING LOMBARD'S PARADOX
catani fabio
1987
Abstract
The authors have analyzed the role of biarticular muscles during the act of arising from a chair by trying to understand the differences found in maximum hip contact pressures between standing up, stair-climbing and level walking. They have found that despite its energy cost, cocontraction is normal in all these activities, with the simultaneous hip and knee extension explained by biarticular muscle action, Lombard's paradox, and the respective muscle lever arms. Furthermore, cocontraction is used when a joint must be stiffened, as, for example, in preparing to absorb an abrupt load such as heel strike.
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