期刊名称：Annals of Agricultural and Environmental Medicine
印刷版ISSN：1232-1966
电子版ISSN：1898-2263
出版年度：2018
卷号：25
期号：2
页码：1-4
DOI：10.26444/aaem/81716
出版社：Institute of Agricultural Medicine in Lublin
摘要：Introduction. Muscle fatigue has been studied for a long time with the use of a wide variety of exercise models, protocols and
assessment methods, among which surface electromyography (sEMG) is most commonly used. The main sEMG parameters
(amplitude and frequency) are prevalently used to evaluate the level of muscle fatigue in static and dynamic contractions.
Objective. The purpose of this study is to determine and compare 2 separate indices: IF1 basis of the sEMG signal amplitude
analysis and IF2 basis of the sEMG median frequency analysis, related to muscles fatigue during an isometric contraction.
Materials and method. The study was performed on 60 professional runners divided into 2 equal groups. The first group
comprised sprinters, competing in short distance track and field events (100 and 200 meters). The second group consisted
of middle-distance runners, competing in middle-distance track and field events (800 and 1,500 meters). The electrical
activity of the VMO muscles of the right and left lower limbs was recorded simultaneously during isometric activity in a
squatting position. The sEMG data was used to determine and compare IF1
and IF2
indices.
Results. During isometric measurement, sprinters presented a much more significant increase in the mean amplitude
of sEMG signal in comparison to middle-distance runners (mean IF1
difference: 0.228; p=0.007). Analysis of the median
frequency did not show significant differences between the 2 groups (mean IF2
difference: 0.037; p=0.12).
Conclusions. Change in sEMG amplitude during isometric exercise may be related to muscles fatigue. The use of fatigue
indices, based on sEMG amplitude, as an objective indicator of the efficacy of an endurance training programme for
sportsmen requires further research.
