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Fonction musculaire et performances fonctionnelles de la personne âgée

Abstract : This work has focused on the study of factors that explain the functionals performances of the lower limbs of the elderly. In a first study we showed that the maximum power (Pmax) and its component called the optimal speed (Vopt) obtained during a test of force-velocity of the knee extensors, are important determinants of functional performance elderly evaluated on three tests: walking on 6m, sit to stand 5 times from a chair and climbing 5 stairs. The more a person has a high Pmax and Vopt, the more its performance during functional tests will be. In addition, Vopt is considered an indirect assessment of the percentage of fast fibers; subjects with the highest values of Vopt are best performers during functional tests. The second study measured and compared the electromyographic (EMG) activity of the quadriceps when tested for isometric maximum voluntary contraction (IMVC), determination of maximum power and functional tests mentioned above. Measurement of EMG signal during these tests was used to determine to what extent the type of task induced a maximum activation or not. Older people show a greater ability to activate their quadriceps muscles when tested for concentric contraction rather than isometric or eccentric contractions. Tests using the IMVC compared to tests for determining the power, sit-tostand and stairs climbing would not be the most appropriate tests to measure the maximum neuromuscular activation capacity in the elderly. From these results improved testing of the elderly and guidelines for rehabilitation are proposed
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Submitted on : Saturday, March 7, 2015 - 2:30:33 AM
Last modification on : Tuesday, March 29, 2022 - 3:04:24 AM
Long-term archiving on: : Monday, June 8, 2015 - 2:32:12 PM


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  • HAL Id : tel-01127423, version 1


Michel Clémençon. Fonction musculaire et performances fonctionnelles de la personne âgée. Education. Université Claude Bernard - Lyon I, 2014. Français. ⟨NNT : 2014LYO10312⟩. ⟨tel-01127423⟩



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