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Closed chain assessment of quadriceps activation using the superimposed burst technique.
J Electromyogr Kinesiol. 2014 Jun; 24(3):341-7.JE

Abstract

The superimposed burst technique is used to estimate quadriceps central activation ratio during a maximal voluntary isometric contraction, which is calculated from force data during an open-chain knee extension task. Assessing quadriceps activation in a closed-chain position would more closely simulate the action of the quadriceps during activity. Our aim was to determine the test-retest reliability of the quadriceps central activation ratio in the closed chain.

METHODS

Twenty-two healthy, active volunteers (13M/12F; age=23.8±3; height=72.7±14.5cm; mass=175.3±9.6kg) were recruited to participate. Knee extension MVIC torque and the peak torque during a superimposed electrical stimulus delivered to the quadriceps during an MVIC were measured to estimate quadriceps CAR. Interclass correlation coefficients were used to assess test-retest reliability between sessions, and Bland-Altman plots to graphically assess agreement between sessions.

RESULTS

Test-retest reliability was fair for CAR (ICC2,k=0.68; P=0.005), with a mean difference of -2.8±10.3%, and limits of agreement ranging -23.1-18.1%.

CONCLUSIONS

CAR calculated using the superimposed burst technique is moderately reliable in a closed-chain position using technique-based instruction. Although acceptable reliability was demonstrated, wide limits of agreement suggest high variability between sessions.

Authors+Show Affiliations

Department of Human Services, Kinesiology Program Area, University of Virginia, United States. Electronic address: gen5e@virginia.edu.Department of Human Services, Kinesiology Program Area, University of Virginia, United States.Department of Human Services, Kinesiology Program Area, University of Virginia, United States.

Pub Type(s)

Clinical Trial
Journal Article

Language

eng

PubMed ID

24731724

Citation

Norte, Grant E., et al. "Closed Chain Assessment of Quadriceps Activation Using the Superimposed Burst Technique." Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, vol. 24, no. 3, 2014, pp. 341-7.
Norte GE, Kuenze C, Hart JM. Closed chain assessment of quadriceps activation using the superimposed burst technique. J Electromyogr Kinesiol. 2014;24(3):341-7.
Norte, G. E., Kuenze, C., & Hart, J. M. (2014). Closed chain assessment of quadriceps activation using the superimposed burst technique. Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, 24(3), 341-7. https://doi.org/10.1016/j.jelekin.2014.03.008
Norte GE, Kuenze C, Hart JM. Closed Chain Assessment of Quadriceps Activation Using the Superimposed Burst Technique. J Electromyogr Kinesiol. 2014;24(3):341-7. PubMed PMID: 24731724.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Closed chain assessment of quadriceps activation using the superimposed burst technique. AU - Norte,Grant E, AU - Kuenze,Christopher, AU - Hart,Joseph M, Y1 - 2014/04/01/ PY - 2013/05/24/received PY - 2014/02/24/revised PY - 2014/03/16/accepted PY - 2014/4/16/entrez PY - 2014/4/16/pubmed PY - 2014/9/7/medline KW - Central activation ratio KW - Electrical stimulation KW - Test–retest reliability SP - 341 EP - 7 JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology JO - J Electromyogr Kinesiol VL - 24 IS - 3 N2 - UNLABELLED: The superimposed burst technique is used to estimate quadriceps central activation ratio during a maximal voluntary isometric contraction, which is calculated from force data during an open-chain knee extension task. Assessing quadriceps activation in a closed-chain position would more closely simulate the action of the quadriceps during activity. Our aim was to determine the test-retest reliability of the quadriceps central activation ratio in the closed chain. METHODS: Twenty-two healthy, active volunteers (13M/12F; age=23.8±3; height=72.7±14.5cm; mass=175.3±9.6kg) were recruited to participate. Knee extension MVIC torque and the peak torque during a superimposed electrical stimulus delivered to the quadriceps during an MVIC were measured to estimate quadriceps CAR. Interclass correlation coefficients were used to assess test-retest reliability between sessions, and Bland-Altman plots to graphically assess agreement between sessions. RESULTS: Test-retest reliability was fair for CAR (ICC2,k=0.68; P=0.005), with a mean difference of -2.8±10.3%, and limits of agreement ranging -23.1-18.1%. CONCLUSIONS: CAR calculated using the superimposed burst technique is moderately reliable in a closed-chain position using technique-based instruction. Although acceptable reliability was demonstrated, wide limits of agreement suggest high variability between sessions. SN - 1873-5711 UR - https://www.unboundmedicine.com/medline/citation/24731724/Closed_chain_assessment_of_quadriceps_activation_using_the_superimposed_burst_technique_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1050-6411(14)00061-3 DB - PRIME DP - Unbound Medicine ER -