The Effect of Pedaling and Fatigue on Changes of Knee Muscles Co-contraction During Running in Triathletes
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 fr...
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Islamic Azad University, Hamedan Branch
2015-09-01
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doaj-e05f387575264378a90646f5cfaa10e42020-11-24T21:02:57ZfasIslamic Azad University, Hamedan BranchBiyumikānīk-i varzishī2476-49062476-59372015-09-0111The Effect of Pedaling and Fatigue on Changes of Knee Muscles Co-contraction During Running in TriathletesMehrdad Anbarian0Mostafa SepehrianFarzad NazemBehrooz HajilooDepartment of Sport Biomechanics, Physical Education Faculty, Professor Bu Ali Sina University, Hamedan, Iran.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. http://biomechanics.iauh.ac.ir/browse.php?a_code=A-10-39-1&slc_lang=en&sid=1&sw=FatigueFatigueCyclingRunningTriathlon |
collection |
DOAJ |
language |
fas |
format |
Article |
sources |
DOAJ |
author |
Mehrdad Anbarian Mostafa Sepehrian Farzad Nazem Behrooz Hajiloo |
spellingShingle |
Mehrdad Anbarian Mostafa Sepehrian Farzad Nazem Behrooz Hajiloo The Effect of Pedaling and Fatigue on Changes of Knee Muscles Co-contraction During Running in Triathletes Biyumikānīk-i varzishī Fatigue Cycling Running Triathlon |
author_facet |
Mehrdad Anbarian Mostafa Sepehrian Farzad Nazem Behrooz Hajiloo |
author_sort |
Mehrdad Anbarian |
title |
The Effect of Pedaling and Fatigue on Changes of Knee Muscles Co-contraction During Running in Triathletes |
title_short |
The Effect of Pedaling and Fatigue on Changes of Knee Muscles Co-contraction During Running in Triathletes |
title_full |
The Effect of Pedaling and Fatigue on Changes of Knee Muscles Co-contraction During Running in Triathletes |
title_fullStr |
The Effect of Pedaling and Fatigue on Changes of Knee Muscles Co-contraction During Running in Triathletes |
title_full_unstemmed |
The Effect of Pedaling and Fatigue on Changes of Knee Muscles Co-contraction During Running in Triathletes |
title_sort |
effect of pedaling and fatigue on changes of knee muscles co-contraction during running in triathletes |
publisher |
Islamic Azad University, Hamedan Branch |
series |
Biyumikānīk-i varzishī |
issn |
2476-4906 2476-5937 |
publishDate |
2015-09-01 |
description |
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.
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topic |
Fatigue Cycling Running Triathlon |
url |
http://biomechanics.iauh.ac.ir/browse.php?a_code=A-10-39-1&slc_lang=en&sid=1&sw=Fatigue |
work_keys_str_mv |
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