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
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©Journal of Sports Science and Medicine (2014) 13, 724 - 730

Research article
The Effect of Fatigue on Electromyographic Characteristics during Obstacle Crossing of Different Heights in Young Adults
Christos Antonopoulos1, Dimitrios Patikas2, , Nikolaos Koutlianos1, Sophia D. Papadopoulou1, Dimitrios Chatzopoulos1, Konstantinos Hatzikotoulas1, Eleni Bassa1, Christos Kotzamanidis1
Author Information
1 Department of Physical Education and Sport Science, Aristotle University of Thessaloniki, Greece
2 Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Greece

Dimitrios Patikas
✉ Dept. of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Ag. Ioannis, 62110 Serres, Greece
Email: dpatikas@auth.gr
Publish Date
Received: 17-03-2014
Accepted: 24-06-2014
Published (online): 01-12-2014
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ABSTRACT

The aim of this study was to investigate the effect of fatigue on electromyographic (EMG) parameters of healthy young adults during obstacle crossing of two different heights. Twelve untrained male adults (23 ± 5 years of age) were fatigued running on a treadmill with increasing speed and inclination and walked over an obstacle with a height set at 10% and 20% of each individual’s lower limb length. Maximal plantar flexor torque and EMG of the medial gastrocnemius, soleus, and tibialis anterior muscles of the trailing limb were assessed during obstacle crossing. Data were captured before, immediately after and 5 minutes after a fatigue session. Fatigue induced significant reduction on the plantar flexor torque output immediately after and 5 minutes after exhaustion. After fatigue gait speed was not affected, the minimum distance between the obstacle and the trailing or leading foot remained unchanged, and the trailing foot contacted the ground closer to the obstacle immediately after fatigue. Regarding the EMG, medial gastrocnemius became after fatigue more active during swing phase when increasing the obstacle height, whereas this was not the case before or 5 minutes after fatigue. No other significant difference was observed for any of the examined muscles. It is concluded that the assessed fatigue protocol induced only minimal changes in the EMG activity of the examined muscles during obstacle crossing. Therefore, it is suggested that the neuromuscular system of healthy young individuals is able to respond to the decreased force capacity after fatigue during obstacle crossing of heights up to the 20% of the limb length.

Key words: Gait, obstacle, fatigue, electromyography


           Key Points
  • Exhaustion after running on a treadmill induces significant reduction in plantar flexion strength and changes in the positioning of the feet relative to the obstacle during obstacle crossing.
  • EMG activity of the calf muscles of the trailing limb does not change significantly after fatigue during the stance phase
  • During swing phase, medial gastrocnemius EMG activity of the trailing limb increases after fatigue when obstacle height increases.
  • These minor changes in EMG after fatigue, reveals that untrained, healthy, young subjects may compensate the deficit in muscular force due to fatigue when performing obstacle crossing.
 
 
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