Akademik Veri Yönetim Sistemi
50th ICHPER.SD (International Council For Healthy & Physical Education, Recreation, Sport & Dance) World Congress 2008 Program I Proceedings, Kagoshima, Japonya, 9 - 12 Mayıs 2008, ss.419-422
THE EVALUATION OF FATIGUE DURING ISOMETRIC CONTRACTIONS IN
ELITE WRESTLERS AND SEDENTARY SUBJECTS BY SURT'ACE EMG
Selda Uzun, Hasan Kasap, Omer Sayli, Yasar Tatar, Birol Cotuk
Head of Dept of Training Education. School of Physical Education and Sport, Marmara
University
A.bstract
Surface Electromyography (SEMG) is increasingly used to monitor muscle fatigue,
which is a basic physical evaluation parameter of sport performance. In this study, we
aimed to determine whether the Mean Frequency (MNF), Median Frequency (MDF)
and Root Mean Square (RMS) of the SEMG signal frequency spectrum are suited to
evaluate muscle endurance and fatigue in elite wrestlers, and whether elite wrestlers
have different fatigue profiles compared with sedentary people.
This study was conducted on 19 elite wrestlers and 19 sedentary men. The semg was
recorded from the m. biceps brachii of the dominant hand at 90o flexion of the elbow
joint. The subjects' sustained isometric contractions at 50% and 75Yo of Maximal
Voluntary Contraction (MVC) till fatigue ensued. No difference between the groups was
recorded for endurance time. In both groups, signal amplitude increased and the spectral
parameters shifted to lower frequencies. No significant differences were found for the
spectral parameters MNF and MDF between both groups (p0.05). Only for 50% of
MVC the increase of RMS was significantly higher in wrestlers (p<0.05). This finding
may be the result of training induced muscle adaptations for wrestlers. As a result,
SEMG may provide valuable information in order to evaluate fatigue during sustained
isometric contractions and assist training periodization.
Keyword: surface EMG muscle fatigue, wrestler