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Title: Differences in muscle contraction onset as determined by ultrasound and electromyography

Journal Article · · Muscle and Nerve
DOI: https://doi.org/10.1002/mus.26395 · OSTI ID:1786515
 [1];  [2];  [1]
  1. United States Army Research Laboratory Human Research and Engineering Directorate 459 Mulberry Point Road, Aberdeen Proving Ground Maryland USA
  2. United States Army Research Laboratory Human Research and Engineering Directorate Research Triangle Park North Carolina USA

ABSTRACT Introduction We characterize the agreement between the timing of muscle contraction onset detected by surface electromyography (sEMG), fine wire EMG (fwEMG), and motion‐mode (M‐mode) ultrasound for improved interpretations of clinical outcomes. Methods Eighteen healthy adults participated. Differences in contraction onset were compared between sEMG, fwEMG, and M‐mode ultrasound collected during concentric contractions of the vastus lateralis and biceps brachii. Results The mean difference of 13.1 ms (‐33.3–59.9) between sEMG and fwEMG was non‐significant (intraclass correlation [ICC] = 0.60). Ultrasound was significantly different from surface and fine wire EMG (ICC = 0.65 and ICC = 0.40, respectively), occurring 98.6 ms (72.3–124.9) and 111.7 (60.3–163.0) before sEMG and fwEMG, respectively. Nonparametric interquartile ranges were also wide. Conclusions Due to high variability, comparisons between EMG methods should be interpreted with caution. Ultrasound detected onset before either EMG method, which may indicate motion from adjacent muscles during voluntary contractions. Muscle Nerve 59:494–500, 2019

Sponsoring Organization:
USDOE
OSTI ID:
1786515
Journal Information:
Muscle and Nerve, Journal Name: Muscle and Nerve Journal Issue: 4 Vol. 59; ISSN 0148-639X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English

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