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Activation varies among the knee extensor muscles during a submaximal fatiguing contraction in the seated and supine postures.
J Appl Physiol (1985). 2003 Oct; 95(4):1515-22.JA

Abstract

Ten young men sustained an isometric contraction of the knee extensor muscles at 20% of the maximum voluntary contraction (MVC) torque on three separate occasions in a seated posture. Subjects performed an isometric knee extension contraction on a fourth occasion in a supine posture. The time to task failure for the seated posture was similar across sessions (291 +/- 84 s; P > 0.05), and the MVC torque was similarly reduced across sessions after the fatiguing contraction (42 +/- 12%). The rate of increase in electromyograph (EMG) activity (%MVC) and torque fluctuations during the fatiguing contractions were similar across sessions. However, the rate of increase in EMG differed among the knee extensor muscles: the rectus femoris began at a greater amplitude (31.5 +/- 11.0%) compared with the vastus lateralis and vastus medialis muscles (18.8 +/- 5.3%), but it ended at a similar value (45.4 +/- 3.1%). The time to task failure and increase in EMG activity were similar for the seated and supine tasks; however, the reduction in MVC torque was greater for the seated posture. These findings indicate that the time to task failure for the knee extensor muscles that have a common tendon insertion did not alter over repeat sessions as had been observed for the elbow flexor muscles (Hunter SK and Enoka RM. J Appl Physiol 94: 108-118, 2003).

Authors+Show Affiliations

Institut National de la Santé et de la Recherche Médicale/Equipe de Recherche et d'Innovation Technologique 0207, Unité de formation et de Recherche Sciences et Techniques des Activités Physiques et Sportive, Universite de Bourgogne, 21078 Dijon, France.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12970375

Citation

Rochette, L, et al. "Activation Varies Among the Knee Extensor Muscles During a Submaximal Fatiguing Contraction in the Seated and Supine Postures." Journal of Applied Physiology (Bethesda, Md. : 1985), vol. 95, no. 4, 2003, pp. 1515-22.
Rochette L, Hunter SK, Place N, et al. Activation varies among the knee extensor muscles during a submaximal fatiguing contraction in the seated and supine postures. J Appl Physiol (1985). 2003;95(4):1515-22.
Rochette, L., Hunter, S. K., Place, N., & Lepers, R. (2003). Activation varies among the knee extensor muscles during a submaximal fatiguing contraction in the seated and supine postures. Journal of Applied Physiology (Bethesda, Md. : 1985), 95(4), 1515-22.
Rochette L, et al. Activation Varies Among the Knee Extensor Muscles During a Submaximal Fatiguing Contraction in the Seated and Supine Postures. J Appl Physiol (1985). 2003;95(4):1515-22. PubMed PMID: 12970375.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Activation varies among the knee extensor muscles during a submaximal fatiguing contraction in the seated and supine postures. AU - Rochette,L, AU - Hunter,S K, AU - Place,N, AU - Lepers,R, PY - 2003/9/13/pubmed PY - 2004/4/29/medline PY - 2003/9/13/entrez SP - 1515 EP - 22 JF - Journal of applied physiology (Bethesda, Md. : 1985) JO - J Appl Physiol (1985) VL - 95 IS - 4 N2 - Ten young men sustained an isometric contraction of the knee extensor muscles at 20% of the maximum voluntary contraction (MVC) torque on three separate occasions in a seated posture. Subjects performed an isometric knee extension contraction on a fourth occasion in a supine posture. The time to task failure for the seated posture was similar across sessions (291 +/- 84 s; P > 0.05), and the MVC torque was similarly reduced across sessions after the fatiguing contraction (42 +/- 12%). The rate of increase in electromyograph (EMG) activity (%MVC) and torque fluctuations during the fatiguing contractions were similar across sessions. However, the rate of increase in EMG differed among the knee extensor muscles: the rectus femoris began at a greater amplitude (31.5 +/- 11.0%) compared with the vastus lateralis and vastus medialis muscles (18.8 +/- 5.3%), but it ended at a similar value (45.4 +/- 3.1%). The time to task failure and increase in EMG activity were similar for the seated and supine tasks; however, the reduction in MVC torque was greater for the seated posture. These findings indicate that the time to task failure for the knee extensor muscles that have a common tendon insertion did not alter over repeat sessions as had been observed for the elbow flexor muscles (Hunter SK and Enoka RM. J Appl Physiol 94: 108-118, 2003). SN - 8750-7587 UR - https://www.unboundmedicine.com/medline/citation/12970375/Activation_varies_among_the_knee_extensor_muscles_during_a_submaximal_fatiguing_contraction_in_the_seated_and_supine_postures_ L2 - https://journals.physiology.org/doi/10.1152/japplphysiol.00334.2003?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -