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Wavelet analysis of the EMG signal to assess muscle fatigue in the lower extremities during symmetric movement on a rowing ergometer

Daniel Natalia, Małachowski Jerzy

Acta of Bioengineering and Biomechanics

2023

Vol. 25, no. 2

15--27

The aim of this publication was to propose a method to determine changes in fatigue in selected muscle groups of the lower extremity during dynamic and cyclical motion performed on a rowing ergometer. The study aimed to use the discrete wavelet transform (DWT) to analyze electromyographic signals (EMG) recorded during diagnostic assessment of muscle and peripheral nerve electrical activity (electroneurography) using an electromyography device (EMG). Methods: The analysis involved implementing calculations such as mean frequency (MNF) and median frequency (MDF) using the reconstructed EMG signal through DWT. The study examined the efficacy of DWT analysis in assessing muscle fatigue after physical exertion. Results: The study obtained a negative regression coefficient for DWT analysis in all muscles except for the right gastrocnemius (GAS). The results suggest that DWT analysis can be an effective tool for evaluating muscle fatigue after physical exertion. Conclusions: The use of DWT in the analysis of EMG signals during rowing ergometer exercises has shown promising results in assessing muscle fatigue. However, additional investigations are necessary to confirm and expand these findings. This publication addresses the literature gap on the determination of muscle fatigue considering motion analysis on a rowing ergometer using the discrete wavelet transform. Previous studies have extensively compared and analyzed methods such as the Fourier transform (FFT), short-time Fourier transform (STFT), and wavelet transform (WT) for muscle fatigue analysis. However, no previous work has specifically examined the assessment of muscle fatigue by incorporating DWT analysis with motion analysis on a rowing ergometer.

Analiza termiczna symetrii pracy wybranych grup mięśniowych – badania wstępne

Szurko Agnieszka, Kasprzyk Teresa, Stanek Agata, Kazior Maksymilian, Sieroń Karolina, Cholewka Armand, Morawiec Tadeusz

Inżynier i Fizyk Medyczny

2021

Vol. 10, nr 6

487--491

Analiza efektywnego treningu sportowca przygotowującego się do zawodów to nie tylko odpowiednia moc wydatkowana, ale właściwe zaangażowanie mięśniowe, czyli np. symetryczność pracy mięśni. W analizie symetryczności przydatnym narzędziem wydaje się być termowizja, która pokaże zmiany temperatury powierzchni ciała odpowiadające poszczególnym partiom mięśni. Pilotażowe badania zostały przeprowadzone na grupie 5 ochotników. Były to osoby dorosłe płci męskiej, w przedziale wiekowym od 24 do 35 lat. Osoby biorące udział w badaniu cechowały się wysokim stopniem wytrenowania i odbywały minimum trzy jednostki treningowe w wymiarze tygodniowym. Analizie poddano zginacz łokciowy nadgarstka oraz dwugłowy ramienia. Otrzymane wyniki wskazały na wysoką symetrię pracy mięśni podczas treningu na ergometrze wioślarskim. Ponadto wyniki mogą sugerować, iż monitorowanie pracy mięśni sportowców podczas ćwiczeń za pomocą termowizji może dać informacje o wydajności treningu, a nawet jego bezpiecznym przebiegu.

The analysis of professional sportsman effective training preparing to the competition seasons is not only the engaged muscle power but especially proper muscle engaging i.e. symmetry of theirs work. The useful device in muscle work analysis may be thermal imaging showing the body surface temperature changes which is connected with different muscle parts. The studies were performed on 5 professional sportsmen in age 24 to 35 y. and the chosen muscle parts were taken into account: the extensor muscle of the wrist and biceps muscle of the shoulder. Obtained results showed clearly the symmetry of muscle work during training on rowing ergometer. Moreover results may suggest that thermal imaging may give some important information about efficiency of provided training as well as its safety.

Sports biomechanics in the research of the Department of Biomechanics of University School of Physical Education in Poznań. Part 1 Biomechanics of rowing: tests on rowing ergometers, reconstruction and synthesis

Dworak L. B.

Acta of Bioengineering and Biomechanics

2010

Vol. 12, no. 1

55-64

The purpose of this study is to reconstruct the early phase of scientific research conducted at the Department of Biomechanics of the University School of Physical Education in Poznań, particularly the work on biomechanics of rowing, conducted as part of the Ministerial Project PR 105, entitled “The effectiveness of training and competition as well as regeneration in sports”. Three kinds of research have been described, carried out with the use of the rowing ergometers. The first was the research on neuromuscular coordination in the rowing cycle, the second was the research on kinematic and dynamic characteristics of rowing on the Universal Rowing Ergometer UEW-1, while the last one concerned determination of maximum forces generated by functional muscle groups in two characteristic rowing positions within the closed biochain of the torso and the limbs.