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Quadriceps EMG frequency content following isometric lumbar extension exercise.
J Electromyogr Kinesiol. 2010 Oct; 20(5):840-4.JE

Abstract

A relationship exists between muscles of the lumbar spine and those of the lower extremity where the quadriceps become more inhibited after lumbar paraspinal. The purpose of this experiment was to compare surface electromyography (sEMG) total frequency content after lumbar paraspinal fatiguing exercise.

SCOPE

50 subjects performed fatiguing lumbar extension exercise indexed by downward shifts in median frequency calculated from lumbar paraspinal sEMG signal. Before and after each exercise set we recorded maximal, isometric knee extension torque and quadriceps central activation ratio (QI) using the superimposed burst technique while recording vastus lateralis sEMG. We calculated total frequency content of the sEMG signal (fEMG(TOTAL)) as the area of the quadriceps sEMG frequency spectrum. Quadriceps fEMG(TOTAL) decreased from baseline following the first and second exercise sets. There was no significant change in quadriceps sEMG median frequency among baseline and post-exercise measures. The change in fEMG(TOTAL) was correlated with the change in QI following the first (r=-0.41, P=0.003) and second (r=-0.32, P=0.02) exercise sets.

CONCLUSION

Quadriceps fEMG(TOTAL) decreased following fatiguing lumbar extension exercise, in the absence of a significant change in quadriceps median frequency.

Authors+Show Affiliations

Department of Human Services, University of Virginia, Charlottesville, VA, United States. jmh3zf@virginia.eduNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

20042349

Citation

Hart, Joseph M., and Christopher D. Ingersoll. "Quadriceps EMG Frequency Content Following Isometric Lumbar Extension Exercise." Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, vol. 20, no. 5, 2010, pp. 840-4.
Hart JM, Ingersoll CD. Quadriceps EMG frequency content following isometric lumbar extension exercise. J Electromyogr Kinesiol. 2010;20(5):840-4.
Hart, J. M., & Ingersoll, C. D. (2010). Quadriceps EMG frequency content following isometric lumbar extension exercise. Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, 20(5), 840-4. https://doi.org/10.1016/j.jelekin.2009.11.004
Hart JM, Ingersoll CD. Quadriceps EMG Frequency Content Following Isometric Lumbar Extension Exercise. J Electromyogr Kinesiol. 2010;20(5):840-4. PubMed PMID: 20042349.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Quadriceps EMG frequency content following isometric lumbar extension exercise. AU - Hart,Joseph M, AU - Ingersoll,Christopher D, Y1 - 2009/12/29/ PY - 2009/06/17/received PY - 2009/11/06/revised PY - 2009/11/09/accepted PY - 2010/1/1/entrez PY - 2010/1/1/pubmed PY - 2011/1/5/medline SP - 840 EP - 4 JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology JO - J Electromyogr Kinesiol VL - 20 IS - 5 N2 - UNLABELLED: A relationship exists between muscles of the lumbar spine and those of the lower extremity where the quadriceps become more inhibited after lumbar paraspinal. The purpose of this experiment was to compare surface electromyography (sEMG) total frequency content after lumbar paraspinal fatiguing exercise. SCOPE: 50 subjects performed fatiguing lumbar extension exercise indexed by downward shifts in median frequency calculated from lumbar paraspinal sEMG signal. Before and after each exercise set we recorded maximal, isometric knee extension torque and quadriceps central activation ratio (QI) using the superimposed burst technique while recording vastus lateralis sEMG. We calculated total frequency content of the sEMG signal (fEMG(TOTAL)) as the area of the quadriceps sEMG frequency spectrum. Quadriceps fEMG(TOTAL) decreased from baseline following the first and second exercise sets. There was no significant change in quadriceps sEMG median frequency among baseline and post-exercise measures. The change in fEMG(TOTAL) was correlated with the change in QI following the first (r=-0.41, P=0.003) and second (r=-0.32, P=0.02) exercise sets. CONCLUSION: Quadriceps fEMG(TOTAL) decreased following fatiguing lumbar extension exercise, in the absence of a significant change in quadriceps median frequency. SN - 1873-5711 UR - https://www.unboundmedicine.com/medline/citation/20042349/Quadriceps_EMG_frequency_content_following_isometric_lumbar_extension_exercise_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1050-6411(09)00162-X DB - PRIME DP - Unbound Medicine ER -