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Agonist and antagonist muscle activation during maximal and submaximal isokinetic fatigue tests of the knee extensors.
J Electromyogr Kinesiol. 2006 Dec; 16(6):661-8.JE

Abstract

The purpose of this study was to examine the differences in electromyographic activity of agonist and antagonist knee musculature between a maximal and a submaximal isokinetic fatigue protocol. Fourteen healthy males (age: 24.3+/-2.5 years) performed 25 maximal (MIFP) and 60 submaximal (SIFP) isokinetic concentric efforts of the knee extensors at 60 degrees s(-1), across a 90 degrees range of motion. The two protocols were performed a week apart. The EMG activity of vastus medialis (VM), vastus lateralis (VL) and biceps femoris (BF) were recorded using surface electrodes. The peak torque (PT) and average EMG (aEMG) were expressed as percentages of pre-fatigue maximal value. One-way analysis of variance indicated a significant (p<0.05) decline of PT during the maximal (45.7%) and submaximal (46.8%) protocols. During the maximal test, the VM and VL aEMG initially increased and then decreased. In contrast, VM and VL aEMG continuously increased during submaximal testing (p<0.05). The antagonist (BF) aEMG remained constant during maximal test but it increased significantly and then declined during the submaximal testing. The above results indicate that agonist and antagonist activity depends on the intensity of the selected isokinetic fatigue test.

Authors+Show Affiliations

Laboratory of Coaching and Performance, Department of Physical Education and Sport Science, Aristotle University, Thessaloniki, Greece.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16434213

Citation

Hassani, A, et al. "Agonist and Antagonist Muscle Activation During Maximal and Submaximal Isokinetic Fatigue Tests of the Knee Extensors." Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, vol. 16, no. 6, 2006, pp. 661-8.
Hassani A, Patikas D, Bassa E, et al. Agonist and antagonist muscle activation during maximal and submaximal isokinetic fatigue tests of the knee extensors. J Electromyogr Kinesiol. 2006;16(6):661-8.
Hassani, A., Patikas, D., Bassa, E., Hatzikotoulas, K., Kellis, E., & Kotzamanidis, C. (2006). Agonist and antagonist muscle activation during maximal and submaximal isokinetic fatigue tests of the knee extensors. Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, 16(6), 661-8.
Hassani A, et al. Agonist and Antagonist Muscle Activation During Maximal and Submaximal Isokinetic Fatigue Tests of the Knee Extensors. J Electromyogr Kinesiol. 2006;16(6):661-8. PubMed PMID: 16434213.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Agonist and antagonist muscle activation during maximal and submaximal isokinetic fatigue tests of the knee extensors. AU - Hassani,A, AU - Patikas,D, AU - Bassa,E, AU - Hatzikotoulas,K, AU - Kellis,E, AU - Kotzamanidis,C, Y1 - 2006/01/24/ PY - 2005/03/15/received PY - 2005/11/09/revised PY - 2005/11/23/accepted PY - 2006/1/26/pubmed PY - 2007/7/18/medline PY - 2006/1/26/entrez SP - 661 EP - 8 JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology JO - J Electromyogr Kinesiol VL - 16 IS - 6 N2 - The purpose of this study was to examine the differences in electromyographic activity of agonist and antagonist knee musculature between a maximal and a submaximal isokinetic fatigue protocol. Fourteen healthy males (age: 24.3+/-2.5 years) performed 25 maximal (MIFP) and 60 submaximal (SIFP) isokinetic concentric efforts of the knee extensors at 60 degrees s(-1), across a 90 degrees range of motion. The two protocols were performed a week apart. The EMG activity of vastus medialis (VM), vastus lateralis (VL) and biceps femoris (BF) were recorded using surface electrodes. The peak torque (PT) and average EMG (aEMG) were expressed as percentages of pre-fatigue maximal value. One-way analysis of variance indicated a significant (p<0.05) decline of PT during the maximal (45.7%) and submaximal (46.8%) protocols. During the maximal test, the VM and VL aEMG initially increased and then decreased. In contrast, VM and VL aEMG continuously increased during submaximal testing (p<0.05). The antagonist (BF) aEMG remained constant during maximal test but it increased significantly and then declined during the submaximal testing. The above results indicate that agonist and antagonist activity depends on the intensity of the selected isokinetic fatigue test. SN - 1050-6411 UR - https://www.unboundmedicine.com/medline/citation/16434213/Agonist_and_antagonist_muscle_activation_during_maximal_and_submaximal_isokinetic_fatigue_tests_of_the_knee_extensors_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1050-6411(05)00144-6 DB - PRIME DP - Unbound Medicine ER -