Tags

Type your tag names separated by a space and hit enter

Electromyographic activity of the quadriceps components during the final degrees of knee extension.
J Back Musculoskelet Rehabil. 2011; 24(4):215-23.JB

Abstract

An imbalance in the recruitment patterns of the quadriceps muscle has been implicated in patellofemoral knee pain; however ambiguity remains in the normal recruitment patterns of this muscle. We investigated the activity of the quadriceps muscle during the final degrees of knee extension, specifically in the medial and lateral components. Sixteen healthy subjects (age; 22.5 (± 3.4) years, body mass; 67.5 (± 12.1) kg and height; 173.9 (± 10.4) cm) participated.Torque and electromyographic (EMG) activity of the quadriceps muscle were measured during isokinetic and isometric knee extensions. Torque and EMG activity reduced in all component muscles during the final degrees of isokinetic extension, but this did not occur during isometric contractions at similar angles. Normalised activity of rectus femoris (RF) was greater than that of vastus lateralis (VL) and vastus medialis obliquus (VMO) during the final degrees of isokinetic knee extension at 30°/sec; there were no differences between any component muscles at the higher velocities. VMO:VL and vastus medialis longus (VML):VL ratios were unchanged during knee extensions, except that VML:VL ratio increased significantly during the final degrees of extension at 30°/sec. Future work should compare these results with people with anterior knee pain, and explore this further during activities of daily living.

Authors+Show Affiliations

Human Performance Group, Division of Surgery, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, London, UK. l.duffell@imperial.ac.ukNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22142710

Citation

Duffell, Lynsey D., et al. "Electromyographic Activity of the Quadriceps Components During the Final Degrees of Knee Extension." Journal of Back and Musculoskeletal Rehabilitation, vol. 24, no. 4, 2011, pp. 215-23.
Duffell LD, Dharni H, Strutton PH, et al. Electromyographic activity of the quadriceps components during the final degrees of knee extension. J Back Musculoskelet Rehabil. 2011;24(4):215-23.
Duffell, L. D., Dharni, H., Strutton, P. H., & McGregor, A. H. (2011). Electromyographic activity of the quadriceps components during the final degrees of knee extension. Journal of Back and Musculoskeletal Rehabilitation, 24(4), 215-23. https://doi.org/10.3233/BMR-2011-0298
Duffell LD, et al. Electromyographic Activity of the Quadriceps Components During the Final Degrees of Knee Extension. J Back Musculoskelet Rehabil. 2011;24(4):215-23. PubMed PMID: 22142710.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Electromyographic activity of the quadriceps components during the final degrees of knee extension. AU - Duffell,Lynsey D, AU - Dharni,Herjyot, AU - Strutton,Paul H, AU - McGregor,Alison H, PY - 2011/12/7/entrez PY - 2011/12/7/pubmed PY - 2012/4/7/medline SP - 215 EP - 23 JF - Journal of back and musculoskeletal rehabilitation JO - J Back Musculoskelet Rehabil VL - 24 IS - 4 N2 - An imbalance in the recruitment patterns of the quadriceps muscle has been implicated in patellofemoral knee pain; however ambiguity remains in the normal recruitment patterns of this muscle. We investigated the activity of the quadriceps muscle during the final degrees of knee extension, specifically in the medial and lateral components. Sixteen healthy subjects (age; 22.5 (± 3.4) years, body mass; 67.5 (± 12.1) kg and height; 173.9 (± 10.4) cm) participated.Torque and electromyographic (EMG) activity of the quadriceps muscle were measured during isokinetic and isometric knee extensions. Torque and EMG activity reduced in all component muscles during the final degrees of isokinetic extension, but this did not occur during isometric contractions at similar angles. Normalised activity of rectus femoris (RF) was greater than that of vastus lateralis (VL) and vastus medialis obliquus (VMO) during the final degrees of isokinetic knee extension at 30°/sec; there were no differences between any component muscles at the higher velocities. VMO:VL and vastus medialis longus (VML):VL ratios were unchanged during knee extensions, except that VML:VL ratio increased significantly during the final degrees of extension at 30°/sec. Future work should compare these results with people with anterior knee pain, and explore this further during activities of daily living. SN - 1878-6324 UR - https://www.unboundmedicine.com/medline/citation/22142710/Electromyographic_activity_of_the_quadriceps_components_during_the_final_degrees_of_knee_extension_ L2 - https://content.iospress.com/openurl?genre=article&id=doi:10.3233/BMR-2011-0298 DB - PRIME DP - Unbound Medicine ER -