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Vastus lateralis oxygenation dynamics during maximal fatiguing concentric and eccentric isokinetic muscle actions.
J Electromyogr Kinesiol. 2011 Apr; 21(2):276-82.JE

Abstract

The present study aimed to assess whether high intensity exhaustive eccentric (ECC) exercise was associated with a greater decrease in muscle oxygenation compared to high intensity exhaustive concentric (CON) exercise during maximal isokinetic knee extensions. On two separate days, ten recreationally active participants performed maximal isokinetic concentric (KE(CON)) and eccentric (KE(ECC)) knee extension exercises at 60°s(-1) until exhaustion. Muscle oxygenation profile and activity were acquired continuously from the vastus lateralis (VL) muscle using near-infrared spectroscopy, along with surface electromyography (sEMG). The torque output was significantly greater during KE(ECC) (P<0.01). Total time to exhaustion was longer in ECC condition (P<0.01). The decrease in tissue oxygenation index observed between the beginning and end-exercise values was significantly greater during KE(ECC) than during KE(CON) (P<0.05) while total haemoglobin volume did not differ significantly. KE(ECC) resulted in a significant increase in end-exercise integrated sEMG (P<0.05). We propose that the associated higher intramuscular pressure may have compressed blood vessels and led to a greater decrease in tissue oxygenation index. The observed end-exercise increase in neural drive during KE(ECC) may have occurred to prevent from muscle performance decrease. These results suggest that, over time, repeated maximal ECC actions induce a greater O(2) extraction compared to maximal CON actions.

Authors+Show Affiliations

Institute for Sport and Health, University College Dublin, Dublin 4, Ireland. romain.denis@ucd.ieNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21256047

Citation

Denis, Romain, et al. "Vastus Lateralis Oxygenation Dynamics During Maximal Fatiguing Concentric and Eccentric Isokinetic Muscle Actions." Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, vol. 21, no. 2, 2011, pp. 276-82.
Denis R, Bringard A, Perrey S. Vastus lateralis oxygenation dynamics during maximal fatiguing concentric and eccentric isokinetic muscle actions. J Electromyogr Kinesiol. 2011;21(2):276-82.
Denis, R., Bringard, A., & Perrey, S. (2011). Vastus lateralis oxygenation dynamics during maximal fatiguing concentric and eccentric isokinetic muscle actions. Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, 21(2), 276-82. https://doi.org/10.1016/j.jelekin.2010.12.006
Denis R, Bringard A, Perrey S. Vastus Lateralis Oxygenation Dynamics During Maximal Fatiguing Concentric and Eccentric Isokinetic Muscle Actions. J Electromyogr Kinesiol. 2011;21(2):276-82. PubMed PMID: 21256047.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Vastus lateralis oxygenation dynamics during maximal fatiguing concentric and eccentric isokinetic muscle actions. AU - Denis,Romain, AU - Bringard,Aurélien, AU - Perrey,Stéphane, Y1 - 2011/01/20/ PY - 2010/09/07/received PY - 2010/11/17/revised PY - 2010/12/22/accepted PY - 2011/1/25/entrez PY - 2011/1/25/pubmed PY - 2011/6/18/medline SP - 276 EP - 82 JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology JO - J Electromyogr Kinesiol VL - 21 IS - 2 N2 - The present study aimed to assess whether high intensity exhaustive eccentric (ECC) exercise was associated with a greater decrease in muscle oxygenation compared to high intensity exhaustive concentric (CON) exercise during maximal isokinetic knee extensions. On two separate days, ten recreationally active participants performed maximal isokinetic concentric (KE(CON)) and eccentric (KE(ECC)) knee extension exercises at 60°s(-1) until exhaustion. Muscle oxygenation profile and activity were acquired continuously from the vastus lateralis (VL) muscle using near-infrared spectroscopy, along with surface electromyography (sEMG). The torque output was significantly greater during KE(ECC) (P<0.01). Total time to exhaustion was longer in ECC condition (P<0.01). The decrease in tissue oxygenation index observed between the beginning and end-exercise values was significantly greater during KE(ECC) than during KE(CON) (P<0.05) while total haemoglobin volume did not differ significantly. KE(ECC) resulted in a significant increase in end-exercise integrated sEMG (P<0.05). We propose that the associated higher intramuscular pressure may have compressed blood vessels and led to a greater decrease in tissue oxygenation index. The observed end-exercise increase in neural drive during KE(ECC) may have occurred to prevent from muscle performance decrease. These results suggest that, over time, repeated maximal ECC actions induce a greater O(2) extraction compared to maximal CON actions. SN - 1873-5711 UR - https://www.unboundmedicine.com/medline/citation/21256047/Vastus_lateralis_oxygenation_dynamics_during_maximal_fatiguing_concentric_and_eccentric_isokinetic_muscle_actions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1050-6411(10)00203-8 DB - PRIME DP - Unbound Medicine ER -