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:: Volume 1, Number 1 (9-2015) ::
J Sport Biomech 2015, 1(1): 5-13 Back to browse issues page
The Effect of Pedaling and Fatigue on Changes of Knee Muscles Co-contraction During Running in Triathletes
Mehrdad Anbarian *, Mostafa Sepehrian, Farzad Nazem, Behrooz Hajiloo
Department of Sport Biomechanics, Physical Education Faculty, Professor Bu Ali Sina University, Hamedan, Iran.
Abstract:   (3669 Views)

Objective: The purpose of this study was to determine the effect of cycling fatigue on co-activation of knee muscles during running in novice triathletes.
Methods: Twelve novice male triathletes aged 23.7±2.1 years participated in this quasi experimental study. Surface electromyographic activity from gastrocnemius, rectus femoris, vastus medialis, vastus lateralis, biceps femoris and semitendinosus were recorded during support and non-support phases of running before and after cycling fatigue protocol. General and directed co-activation of the knee muscles were calculated. Paired t-test was used to analyze the data(p<0.05).
Results: General co-activation was significantly reduced in propulsion sub-phase, total support and non-support phases after fatigue (p=0.001), but there were not any differences in heel contact and midstance sub-phases. Fatigue only altered directed co-activation of medial and lateral knee muscles during heel contact sub-phase (p=0.034). Extensor and flexor directed co-activation during non-support phase of running significantly decreased after fatigue (p=0.011).
Conclusion: Changes in the co-activation during running after cycling fatigue can alter running pattern and reduce the knee function consequently, causing injuries to the lower limbs in novice triathletes.

Keywords: Triathlon, Fatigue, Cycling, Running, Electromyography
Full-Text [PDF 421 kb]   (898 Downloads)    
Type of Study: Research | Subject: Special
Received: 2014/10/30 | Accepted: 2015/01/16 | Published: 2015/05/4
* Corresponding Author Address: Bu Ali Sina University, Physical Education and Sport Sciences Faculty
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Anbarian M, Sepehrian M, Nazem F, Hajiloo B. The Effect of Pedaling and Fatigue on Changes of Knee Muscles Co-contraction During Running in Triathletes. J Sport Biomech. 2015; 1 (1) :5-13
URL: http://biomechanics.iauh.ac.ir/article-1-27-en.html
Volume 1, Number 1 (9-2015) Back to browse issues page
فصلنامه بیومکانیک ورزشی Journal of Sport Biomechanics
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