Electromyographic Evaluation of the Shoulder Muscle after a Fatiguing Isokinetic Protocol in Recreational Overhead Athletes

Sebastian Klich, Adam Kawczyński, Bogdan Pietraszewski, Matteo Zago, Aiguo Chen, Małgorzata Smoter, Hamidollah Hassanlouei and Nicola Lovecchio
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Sebastian Klich: Department of Paralympic Sport, University School of Physical Education in Wrocław, 51-617 Wrocław, Poland
Adam Kawczyński: Department of Paralympic Sport, University School of Physical Education in Wrocław, 51-617 Wrocław, Poland
Bogdan Pietraszewski: Department of Biomechanics, University School of Physical Education in Wrocław, 51-617 Wrocław, Poland
Matteo Zago: Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, 20133 Milano, Italy
Aiguo Chen: College of Physical Education, Yangzhou University, Yangzhou 225009, China
Małgorzata Smoter: Gdańsk Academy of Physical Education and Sport, 80-001 Gdańsk, Poland
Hamidollah Hassanlouei: Department of Cognitive and Behavioral Sciences and Technology in Sport, Shahid Beheshti University, Tehran 1983969411, Iran
Nicola Lovecchio: Department of Public Health, Experimental and Forensic Medicine, University of Pavia, 27100 Pavia, Italy

IJERPH, 2021, vol. 18, issue 5, 1-10

Abstract: The goal of our study was to examine the muscle activity of the shoulder girdle after isokinetic fatigue, which may simulate muscle activities commonly occurring during specific sport-related activities in recreational overhead asymptomatic athletes. We hypothesized that exercise-induced fatigue, reported after isokinetic protocols, may cause a decrease in the median frequency (MF) of the upper trapezius (UT), infraspinatus (IS), and deltoid muscles. Twenty-four male overhead volleyball ( n = 8), handball ( n = 8), and tennis ( n = 8) athletes participated in this study. All subjects were without shoulder injury history. The surface electromyography (SEMG) was collected on the right (dominant) side of the shoulder girdle muscles in the following order: UT, IS and anterior (DA), and posterior deltoideus (DP). The fatigue protocol consisted of three sets of 32 maximum isokinetic concentric contractions while performing shoulder internal and external rotation at an isokinetic speed of 120 o/s. The resultant difference in median frequency (?MF) values consistently dropped after the fatiguing tasks across all recorded muscles, in terms of the initial MF (MF INI = 65.1 ± 1.1 Hz) and final MF (MF FIN = 57.9 ± 0.9 Hz), and the main effect of time was significant (F(1,22) = 43.15, p < 0.001). MF values decreased mostly for IS (?MF IS = ?9.9 ± 1.6 Hz) and DP (?MF PD = ?9.5 ± 1.9 Hz) muscles, while DA and UT showed smaller changes (?MF DA = ?6.9 ± 1.5 Hz) and (?MF UT = ?3.2 ± 1.3 Hz). The results of our study show a meaningful contribution in determining increased fatigue of the shoulder girdle muscles during repeated isokinetic internal-external rotation protocols. We have also demonstrated a significant decrease in MF in all examined muscles, especially IS and DA.

Keywords: overhead sport; SEMG; shoulder girdle; isokinetic; fatigue (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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