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Titolo:
Activation of human quadriceps femoris during isometric, concentric, and eccentric contractions
Autore:
Babault, N; Pousson, M; Ballay, Y; Van Hoecke, J;
Indirizzi:
Univ Bourgogne, Fac Sci Sport, UFR STAPS, Grp Anal Mouvement, F-21078 Dijon, France Univ Bourgogne Dijon France F-21078 nal Mouvement, F-21078 Dijon, France
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 6, volume: 91, anno: 2001,
pagine: 2628 - 2634
SICI:
8750-7587(200112)91:6<2628:AOHQFD>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELBOW FLEXOR MUSCLES; TWITCH INTERPOLATION; VOLUNTARY ACTIVATION; KNEE EXTENSION; VELOCITY RELATIONSHIP; SHORTENING ACTIONS; IN-VIVO; FORCE; FATIGUE; TORQUE;
Keywords:
twitch interpolation; isokinetic contractions; torque level; neural drive; knee extension;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Babault, N Univ Bourgogne, Fac Sci Sport, UFR STAPS, Grp Anal Mouvement, BP 27877, F-21078 Dijon, France Univ Bourgogne BP 27877 Dijon France F-21078 078 Dijon, France
Citazione:
N. Babault et al., "Activation of human quadriceps femoris during isometric, concentric, and eccentric contractions", J APP PHYSL, 91(6), 2001, pp. 2628-2634

Abstract

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 degrees knee flexion (0 degrees = full extension). Concentric, eccentric (both at 20 degrees /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 weresignificantly 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 ispresent during 20 degrees /s maximal concentric and both maximal and submaximal eccentric contractions. These results indicate a voluntary activationdependency on both tension levels and type of muscular actions in the human knee-extensor muscle group.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 08:01:15