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Article Dans Une Revue Journal of Applied Physiology Année : 2001

Activation of human quadriceps femoris during isometric, concentric, and eccentric contractions

Résumé

Maximal and submaximal activation level of the right knee-extensor muscle group were studied during isometric and slow isokinetic muscular contractions in eight male subjects. The activation level was quantified by means of the twitch interpolation technique. A single electrical impulse was delivered, whatever the contraction mode, on the femoral nerve at a constant 50° knee flexion (0° = full extension). Concentric, eccentric (both at 20°/s velocity), and isometric voluntary activation levels were then calculated. The mean activation levels during maximal eccentric and maximal concentric contractions were 88.3 and 89.7%, respectively, and were significantly lower ( P < 0.05) with respect to maximal isometric contractions (95.2%). The relationship between voluntary activation levels and submaximal torques was linearly fitted ( P < 0.01): comparison of slopes indicated lower activation levels during submaximal eccentric compared with isometric or concentric contractions. It is concluded that reduced neural drive is present during 20°/s maximal concentric and both maximal and submaximal eccentric contractions. These results indicate a voluntary activation dependency on both tension levels and type of muscular actions in the human knee-extensor muscle group.
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Dates et versions

hal-03990608 , version 1 (15-02-2023)

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Nicolas Babault, Michel Pousson, Yves Ballay, Jacques van Hoecke. Activation of human quadriceps femoris during isometric, concentric, and eccentric contractions. Journal of Applied Physiology, 2001, 91 (6), pp.2628-2634. ⟨10.1152/jappl.2001.91.6.2628⟩. ⟨hal-03990608⟩
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