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Knee extension fatigue attenuates repeated force production of the elbow flexors.
Eur J Sport Sci. 2014; 14(8):823-9.EJ

Abstract

Non-local muscle fatigue has been demonstrated with unilateral activities, where fatiguing one limb alters opposite limb forces. Fewer studies have examined if non-local fatigue occurs with unrelated muscles. The purpose of this study was to investigate if knee extensors fatigue alters elbow flexors force and electromyography (EMG) activity. Eighteen males completed a control and fatiguing session (randomised). Blood lactate was initially sampled followed by three maximal voluntary contractions (MVC) with the elbow flexors and two with the knee extensors. Thereafter, subjects either sat (control) or performed five sets of bilateral dynamic knee extensions to exhaustion using a load equal to the dominant limb MVC (1-min rest between sets). Immediately afterwards, subjects were assessed for blood lactate and unilateral knee extensors MVC, and after 1 min performed a single unilateral elbow flexor MVC. Two minutes later, subjects performed 12 unilateral elbow flexor MVCs (5 s contraction/10 s rest) followed by a third blood lactate test. Compared to control, knee extensor force dropped by 35% (p < 0.001; ES = 1.6) and blood lactate increased by 18% (p < 0.001; ES = 2.8). Elbow flexor forces were lower after the fatiguing protocol only during the last five MVCs (p < 0.05; ES = ∼ 0.58; ∼ 5%). No changes occurred between conditions in EMG. Elbow flexor forces significantly decreased after knee extensors fatigue. The effect was revealed during the later stages of the repeated MVCs protocol, demonstrating that non-local fatigue may have a stronger effect on repeated rather than on single attempts of maximal force production.

Authors+Show Affiliations

a School of Human Kinetics and Recreation , Memorial University of Newfoundland , St. John's , NL , Canada.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24766625

Citation

Halperin, Israel, et al. "Knee Extension Fatigue Attenuates Repeated Force Production of the Elbow Flexors." European Journal of Sport Science, vol. 14, no. 8, 2014, pp. 823-9.
Halperin I, Aboodarda SJ, Behm DG. Knee extension fatigue attenuates repeated force production of the elbow flexors. Eur J Sport Sci. 2014;14(8):823-9.
Halperin, I., Aboodarda, S. J., & Behm, D. G. (2014). Knee extension fatigue attenuates repeated force production of the elbow flexors. European Journal of Sport Science, 14(8), 823-9. https://doi.org/10.1080/17461391.2014.911355
Halperin I, Aboodarda SJ, Behm DG. Knee Extension Fatigue Attenuates Repeated Force Production of the Elbow Flexors. Eur J Sport Sci. 2014;14(8):823-9. PubMed PMID: 24766625.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Knee extension fatigue attenuates repeated force production of the elbow flexors. AU - Halperin,Israel, AU - Aboodarda,Saied J, AU - Behm,David G, Y1 - 2014/04/25/ PY - 2014/4/29/entrez PY - 2014/4/29/pubmed PY - 2015/6/30/medline KW - Crossover fatigue KW - MVC KW - electromyography KW - endurance KW - quadriceps SP - 823 EP - 9 JF - European journal of sport science JO - Eur J Sport Sci VL - 14 IS - 8 N2 - Non-local muscle fatigue has been demonstrated with unilateral activities, where fatiguing one limb alters opposite limb forces. Fewer studies have examined if non-local fatigue occurs with unrelated muscles. The purpose of this study was to investigate if knee extensors fatigue alters elbow flexors force and electromyography (EMG) activity. Eighteen males completed a control and fatiguing session (randomised). Blood lactate was initially sampled followed by three maximal voluntary contractions (MVC) with the elbow flexors and two with the knee extensors. Thereafter, subjects either sat (control) or performed five sets of bilateral dynamic knee extensions to exhaustion using a load equal to the dominant limb MVC (1-min rest between sets). Immediately afterwards, subjects were assessed for blood lactate and unilateral knee extensors MVC, and after 1 min performed a single unilateral elbow flexor MVC. Two minutes later, subjects performed 12 unilateral elbow flexor MVCs (5 s contraction/10 s rest) followed by a third blood lactate test. Compared to control, knee extensor force dropped by 35% (p < 0.001; ES = 1.6) and blood lactate increased by 18% (p < 0.001; ES = 2.8). Elbow flexor forces were lower after the fatiguing protocol only during the last five MVCs (p < 0.05; ES = ∼ 0.58; ∼ 5%). No changes occurred between conditions in EMG. Elbow flexor forces significantly decreased after knee extensors fatigue. The effect was revealed during the later stages of the repeated MVCs protocol, demonstrating that non-local fatigue may have a stronger effect on repeated rather than on single attempts of maximal force production. SN - 1536-7290 UR - https://www.unboundmedicine.com/medline/citation/24766625/Knee_extension_fatigue_attenuates_repeated_force_production_of_the_elbow_flexors_ L2 - https://www.tandfonline.com/doi/full/10.1080/17461391.2014.911355 DB - PRIME DP - Unbound Medicine ER -