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Accessory muscle activation during the superimposed burst technique.
J Electromyogr Kinesiol. 2012 Aug; 22(4):540-5.JE

Abstract

Quadriceps muscle activation is assessed using the superimposed burst technique. This technique involves percutaneous muscle stimulation superimposed during maximal isometric volitional knee extension. It is unknown whether accessory muscle activation during maximal knee extension influences estimates of quadriceps muscle activation. Our aim was to compare accessory muscle activation while performing the superimposed burst technique using investigator delivered verbal instruction to constrain the system (CS) and a participant preferred (PP) technique. Twenty five healthy, active individuals (13M/12F, age=23.8 ± 3.35, height=72.73 ± 14.51 cm, and weight=175.29 ± 9.59 kg) were recruited for this study. All participants performed superimposed burst testing with (CS) and without (PP) verbal instruction to encourage isolated quadriceps activation during maximal isometric knee extension. The main outcome variables measured were knee extension torque, quadriceps central activation ratio and mean EMG of vastus lateralis, biceps femoris, and lumbar paraspinal muscles. There were significant differences in knee extension torque (CS=2.87 ± 0.93 Nm/kg, PP=3.40 ± 1.12 Nm/kg, p<0.001), superimposed burst torque (CS=3.40 ±0.98 Nm/kg, PP=3.75 ± 1.11 Nm/kg, p=0.002) and quadriceps CAR (CS=84.1 ± 12.0%, PP=90.2 ± 9.9%, p<0.001) between the techniques. There was also a significant difference in lumbar paraspinal EMG (CS=6.40 ± 8.52%, PP=11.86 ± 14.89%, p=0.043) between the techniques however vastus lateralis EMG was not significantly different. Patient instruction via verbal instruction to constrain proximal structures may help patient minimize confounders to knee extension torque generation while maximizing quadriceps activation.

Authors+Show Affiliations

Department of Human Services, Kinesiology Program Area, University of Virginia, Charlottesville, VA 22904-4407, United States.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22321959

Citation

Roberts, Devin, et al. "Accessory Muscle Activation During the Superimposed Burst Technique." Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, vol. 22, no. 4, 2012, pp. 540-5.
Roberts D, Kuenze C, Saliba S, et al. Accessory muscle activation during the superimposed burst technique. J Electromyogr Kinesiol. 2012;22(4):540-5.
Roberts, D., Kuenze, C., Saliba, S., & Hart, J. M. (2012). Accessory muscle activation during the superimposed burst technique. Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, 22(4), 540-5. https://doi.org/10.1016/j.jelekin.2012.01.008
Roberts D, et al. Accessory Muscle Activation During the Superimposed Burst Technique. J Electromyogr Kinesiol. 2012;22(4):540-5. PubMed PMID: 22321959.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Accessory muscle activation during the superimposed burst technique. AU - Roberts,Devin, AU - Kuenze,Christopher, AU - Saliba,Susan, AU - Hart,Joseph M, Y1 - 2012/02/08/ PY - 2011/09/02/received PY - 2012/01/10/revised PY - 2012/01/11/accepted PY - 2012/2/11/entrez PY - 2012/2/11/pubmed PY - 2012/12/13/medline SP - 540 EP - 5 JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology JO - J Electromyogr Kinesiol VL - 22 IS - 4 N2 - Quadriceps muscle activation is assessed using the superimposed burst technique. This technique involves percutaneous muscle stimulation superimposed during maximal isometric volitional knee extension. It is unknown whether accessory muscle activation during maximal knee extension influences estimates of quadriceps muscle activation. Our aim was to compare accessory muscle activation while performing the superimposed burst technique using investigator delivered verbal instruction to constrain the system (CS) and a participant preferred (PP) technique. Twenty five healthy, active individuals (13M/12F, age=23.8 ± 3.35, height=72.73 ± 14.51 cm, and weight=175.29 ± 9.59 kg) were recruited for this study. All participants performed superimposed burst testing with (CS) and without (PP) verbal instruction to encourage isolated quadriceps activation during maximal isometric knee extension. The main outcome variables measured were knee extension torque, quadriceps central activation ratio and mean EMG of vastus lateralis, biceps femoris, and lumbar paraspinal muscles. There were significant differences in knee extension torque (CS=2.87 ± 0.93 Nm/kg, PP=3.40 ± 1.12 Nm/kg, p<0.001), superimposed burst torque (CS=3.40 ±0.98 Nm/kg, PP=3.75 ± 1.11 Nm/kg, p=0.002) and quadriceps CAR (CS=84.1 ± 12.0%, PP=90.2 ± 9.9%, p<0.001) between the techniques. There was also a significant difference in lumbar paraspinal EMG (CS=6.40 ± 8.52%, PP=11.86 ± 14.89%, p=0.043) between the techniques however vastus lateralis EMG was not significantly different. Patient instruction via verbal instruction to constrain proximal structures may help patient minimize confounders to knee extension torque generation while maximizing quadriceps activation. SN - 1873-5711 UR - https://www.unboundmedicine.com/medline/citation/22321959/Accessory_muscle_activation_during_the_superimposed_burst_technique_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1050-6411(12)00010-7 DB - PRIME DP - Unbound Medicine ER -