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Effect of differing intensities of fatiguing dynamic contractions on contralateral homologous muscle performance.
J Sports Sci Med. 2014 Dec; 13(4):836-45.JS

Abstract

The purpose of this study was to investigate different intensities of unilateral fatiguing dynamic quadriceps contractions on non-exercised, contralateral quadriceps performance. In a randomized crossover study design with 12 recreationally trained male (1.78 ± 0.05 m, 84.5 ± 7.6 kg, 30.0 ± 8.5 yrs) participants, maximal voluntary contraction (MVC) force, force developed in the first 100 ms (F100), and electromyography of the non-exercised contralateral knee extensors were measured before and after fatiguing protocols performed by ipsilateral knee extensors. Non-exercised knee extensors' endurance was also measured post-intervention. The fatigue protocols consisted of four sets of dynamic knee extensions each to task failure with 40% and 70% MVC on separate days. Both the 40% (p = 0.009, Effect Size [ES] = 0.72) and 70% (p = 0.001, ES = 2.03) conditions exhibited 23.7% and 34.6% decreases in F100 respectively with the non-exercised contralateral knee extensors. A significant time effect (p = 0.002) demonstrated that both the 40% (and 70% (conditions exhibited 4.4% (ES = 0.29) and 7.1% (ES = 0.53) force decreases from pre- to post-intervention, respectively. However, the condition * time interaction only showed a trend (p = 0.09) with moderate (40%: ES = 0.62) to large (70%: ES = 0.82) effect sizes for decreased contralateral limb force compared with control session. The 40% (p = 0.09, ES = 0.65) and 70% (p = 0.07, ES = 0.79) protocols had a tendency to induce greater contralateral force variation during sustained submaximal isometric contraction compared with control. In conclusion, this study highlighted that unilateral lower limb fatigue induced by low intensity as well as high intensity dynamic knee extensions provided some evidence of crossover fatigue with the contralateral non-exercised limb. Key PointsThere was a pattern of crossover fatigue effects with significant impairments in F100, near significant, moderate to large magnitude decrements in MVC force and moderate magnitude increases in submaximal force variability in the contralateral knee extensors.Although both contraction intensities resulted in significant and near significant F100 and force decrements respectively, higher intensity (70%) fatiguing contractions manifested moderate to large magnitude effects (force and F100 respectively) compared to small to moderate magnitude effects (F100 and force respectively) for the lower intensity (40%) fatiguing contractions.

Authors+Show Affiliations

School of Human Kinetics and Recreation, Memorial University of Newfoundland , Newfoundland, Canada.School of Human Kinetics and Recreation, Memorial University of Newfoundland , Newfoundland, Canada.School of Human Kinetics and Recreation, Memorial University of Newfoundland , Newfoundland, Canada.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25435777

Citation

Kawamoto, Jon-Erik, et al. "Effect of Differing Intensities of Fatiguing Dynamic Contractions On Contralateral Homologous Muscle Performance." Journal of Sports Science & Medicine, vol. 13, no. 4, 2014, pp. 836-45.
Kawamoto JE, Aboodarda SJ, Behm DG. Effect of differing intensities of fatiguing dynamic contractions on contralateral homologous muscle performance. J Sports Sci Med. 2014;13(4):836-45.
Kawamoto, J. E., Aboodarda, S. J., & Behm, D. G. (2014). Effect of differing intensities of fatiguing dynamic contractions on contralateral homologous muscle performance. Journal of Sports Science & Medicine, 13(4), 836-45.
Kawamoto JE, Aboodarda SJ, Behm DG. Effect of Differing Intensities of Fatiguing Dynamic Contractions On Contralateral Homologous Muscle Performance. J Sports Sci Med. 2014;13(4):836-45. PubMed PMID: 25435777.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of differing intensities of fatiguing dynamic contractions on contralateral homologous muscle performance. AU - Kawamoto,Jon-Erik, AU - Aboodarda,Saied Jalal, AU - Behm,David George, Y1 - 2014/12/01/ PY - 2014/06/13/received PY - 2014/08/13/accepted PY - 2014/12/2/entrez PY - 2014/12/2/pubmed PY - 2014/12/2/medline KW - Central fatigue KW - dynamic contractions KW - electromyography KW - maximal voluntary contraction KW - peripheral fatigue SP - 836 EP - 45 JF - Journal of sports science & medicine JO - J Sports Sci Med VL - 13 IS - 4 N2 - The purpose of this study was to investigate different intensities of unilateral fatiguing dynamic quadriceps contractions on non-exercised, contralateral quadriceps performance. In a randomized crossover study design with 12 recreationally trained male (1.78 ± 0.05 m, 84.5 ± 7.6 kg, 30.0 ± 8.5 yrs) participants, maximal voluntary contraction (MVC) force, force developed in the first 100 ms (F100), and electromyography of the non-exercised contralateral knee extensors were measured before and after fatiguing protocols performed by ipsilateral knee extensors. Non-exercised knee extensors' endurance was also measured post-intervention. The fatigue protocols consisted of four sets of dynamic knee extensions each to task failure with 40% and 70% MVC on separate days. Both the 40% (p = 0.009, Effect Size [ES] = 0.72) and 70% (p = 0.001, ES = 2.03) conditions exhibited 23.7% and 34.6% decreases in F100 respectively with the non-exercised contralateral knee extensors. A significant time effect (p = 0.002) demonstrated that both the 40% (and 70% (conditions exhibited 4.4% (ES = 0.29) and 7.1% (ES = 0.53) force decreases from pre- to post-intervention, respectively. However, the condition * time interaction only showed a trend (p = 0.09) with moderate (40%: ES = 0.62) to large (70%: ES = 0.82) effect sizes for decreased contralateral limb force compared with control session. The 40% (p = 0.09, ES = 0.65) and 70% (p = 0.07, ES = 0.79) protocols had a tendency to induce greater contralateral force variation during sustained submaximal isometric contraction compared with control. In conclusion, this study highlighted that unilateral lower limb fatigue induced by low intensity as well as high intensity dynamic knee extensions provided some evidence of crossover fatigue with the contralateral non-exercised limb. Key PointsThere was a pattern of crossover fatigue effects with significant impairments in F100, near significant, moderate to large magnitude decrements in MVC force and moderate magnitude increases in submaximal force variability in the contralateral knee extensors.Although both contraction intensities resulted in significant and near significant F100 and force decrements respectively, higher intensity (70%) fatiguing contractions manifested moderate to large magnitude effects (force and F100 respectively) compared to small to moderate magnitude effects (F100 and force respectively) for the lower intensity (40%) fatiguing contractions. SN - 1303-2968 UR - https://www.unboundmedicine.com/medline/citation/25435777/Effect_of_differing_intensities_of_fatiguing_dynamic_contractions_on_contralateral_homologous_muscle_performance_ L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25435777/ DB - PRIME DP - Unbound Medicine ER -
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