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Reliability of EMG normalisation methods for upper-limb muscles.

Samuel Rota1, Isabelle Rogowski, Stéphane Champely

  • 1a Université Lyon 1 - Lyon , CRIS EA 647, Villeurbanne Cedex , 69622 France.

Journal of Sports Sciences
|May 24, 2013
PubMed
Summary
This summary is machine-generated.

This study compared electromyographic (EMG) normalization methods for upper-limb muscles in tennis players. Chin-ups and push-ups proved optimal for most muscles, offering a balance of signal amplitude and reliability.

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Science

Background:

  • Electromyography (EMG) is crucial for analyzing muscle activity during movement.
  • Standardizing EMG signals (normalization) is essential for accurate and reliable data interpretation.
  • Optimal EMG normalization methods for upper-limb muscles, especially in athletes, require further investigation.

Purpose of the Study:

  • To compare the efficacy of various electromyographic (EMG) normalization techniques for upper-limb muscles.
  • To evaluate both EMG amplitude and reliability across different normalization methods.
  • To identify the most suitable normalization strategies for specific upper-limb muscles in athletes.

Main Methods:

  • Eighteen male tennis players participated in three testing sessions over seven days.
  • Surface EMG of nine upper-body muscles was recorded during isometric maximal voluntary contractions, push-ups, and chin-ups.
  • Analysis of variance (ANOVA) and reliability metrics (ICC, CV, SEM) were used to compare EMG amplitudes and consistency.

Main Results:

  • Chin-ups were optimal for normalizing M. latissimus dorsi, M. posterior deltoid, M. biceps brachii, M. flexor carpi radialis, and M. extensor carpi radialis.
  • Push-ups were effective for M. anterior deltoid and M. triceps brachii.
  • Isometric maximal voluntary contraction remained best for M. pectoralis major and M. middle deltoid.

Conclusions:

  • The choice of EMG normalization method significantly impacts upper-limb muscle analysis in athletes.
  • Dynamic exercises like chin-ups and push-ups offer superior normalization for several key upper-limb muscles compared to traditional isometric contractions.
  • The study proposes novel EMG normalization methods tailored for specific upper-limb muscles, enhancing data accuracy in sports science research.