EMG frequency during isometric, submaximal activity : a statistical model for biceps brachii

• Autorzy: Solnik S. , De Vita P. , Grzegorczyk K. , Koziatek A. , Bober T.
• Języki publikacji: EN

Abstrakty

EN

The purpose of this study was to develop a statistical model to describe the electromyography (EMG) signal frequency changes during a submaximal isometric contraction. Thirty subjects performed a 30-second isometric contraction of the biceps brachii muscle at 80% of the maximal voluntary isometric force. Surface EMG electrodes recorded electrical activity of the biceps brachii. Zero-Crossing-Rate was calculated to identify EMG frequency shifts. The mean frequencies for every one-second period were used to calculate a linear relationship between frequency and time. A significant relationship ( p < 0.05) between slope and initial frequency value was identified. The model described EMG frequency changes during submaximal effort of biceps brachii up to 15 seconds. The prediction error was 9.8%. Modifying this equation to initial values of frequency of each participant decreased prediction error to 7.2%. These results demonstrate that despite individual differences between subjects it is possible to derive single equation that describes EMG alterations during submaximal, isometric contractions across a homogeneous group of people.

Słowa kluczowe

EN

electromyography; biomedical modelling; muscle fatigue; zero crossing rate

PL

częstotliwość kroku; zmęczenie mięśni; modelowanie biomedyczne; elektromiografia

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Acta of Bioengineering and Biomechanics
• Rocznik: 2010
• Tom: Vol. 12, no. 3
• Strony: 21--28
• Opis fizyczny: Bibliogr. 45 poz., il.

Twórcy

autor

Solnik S.

autor

De Vita P.

autor

Grzegorczyk K.

autor

Koziatek A.

autor

Bober T.

• Faculty of Physical Therapy, University of Physical Education, Wrocław, Poland,

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