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Kinesiology, Vol. 48. No. 2., 2016.

Original scientific paper

https://doi.org/10.26582/k.48.2.14

Test-retest reliability of electromyographic signal parameters used to evaluate neuromuscular fatigue in quadriceps femoris muscle

Cristiano Rocha da Silva ; Laboratory of Biomechanics and Motor Control – FCT/UNESP, Presidente Prudente, Brazil
Danilo de Oliveira Silva ; Laboratory of Biomechanics and Motor Control – FCT/UNESP, Presidente Prudente, Brazil
Ronaldo Valdir Briani ; Laboratory of Biomechanics and Motor Control – FCT/UNESP, Presidente Prudente, Brazil
Marcella Ferraz Pazzinatto ; Laboratory of Biomechanics and Motor Control – FCT/UNESP, Presidente Prudente, Brazil
Deisi Ferrari ; Laboratory of Biomechanics and Motor Control – FCT/UNESP, Presidente Prudente, Brazil
Fábio Mícolis de Azevedo ; Laboratory of Biomechanics and Motor Control – FCT/UNESP, Presidente Prudente, Brazil

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Abstract

The purpose of this study was to analyze the test-retest reliability of the median frequency (MDF) and root mean square (RMS) used to determine the onset of neuromuscular fatigue (NF) during sustained fatiguing contractions of the quadriceps. Eighteen healthy men were tested on two days, and electromyographic (EMG) signals were recorded from the vastus medialis (VM), rectus femoris (RF) and vastus lateralis (VL) during sustained isometric contractions at 20 and 70% of maximum voluntary contractions (MVC) held until exhaustion. The reliability of endurance time was excellent at 20% MVC and poor at 70% MVC. EMG variables were evaluated: (1) at the beginning of the test; (2) at NF; and (3) at the end of the test. The NF time values presented poor reliability. The MDF has shown, in general, poor reliability at 20 and 70% MVC, whereas the RMS reliability presented better results for both loads, especially for RF, followed by the VM
and VL muscles. The MDF and RMS values extracted from NF showed poor reliability at 20 and 70% MVC, which suggests caution in using these variables extracted from the EMG signal to determine the onset of NF.

Keywords

electromyography; isometric contraction; reliability; reproducibility of results; quadriceps muscle

Hrčak ID:

168671

URI

https://hrcak.srce.hr/168671

Publication date:

23.12.2016.

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