Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
©Journal of Sports Science and Medicine (2014) 13, 836 - 845

Research article
Effect of Differing Intensities of Fatiguing Dynamic Contractions on Contralateral Homologous Muscle Performance
Jon-Erik Kawamoto, Saied Jalal Aboodarda, David George Behm 
Author Information
School of Human Kinetics and Recreation, Memorial University of Newfoundland, Newfoundland, Canada

David George Behm
✉ School of Human Kinetics and Recreation, Memorial University of Newfoundland, 230 Elizabeth Ave., St. John's, Newfoundland, Canada, A1C 5S7
Publish Date
Received: 13-06-2014
Accepted: 13-08-2014
Published (online): 01-12-2014
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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 words: Central fatigue, peripheral fatigue, maximal voluntary contraction, dynamic contractions, electromyography

           Key Points
  • There 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.
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