ArticleFrontiers in neurology
Effect of time window on MVC reference for quantifying spastic cocontraction in spastic paresis.
Article in Frontiers in neurology. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: In hemiparesis, spastic cocontraction is typically quantified by normalizing electromyographic activity to the root mean square (RMS) values obtained during maximal voluntary contraction (MVC) of the cocontracting muscle when it acts as an agonist. However, the selection of the RMS time window and the use of filtering procedures vary widely across studies, limiting comparability. In this study, we evaluated the effects of window size and low-pass filter cutoff frequency (ƒc) on the RMS values obtained during MVC in chronic hemiparesis. Methods: Participants with stroke-induced hemiparesis and gastrocnemius spasticity (X Results: A total of 20 participants with hemiparesis (age: 56.4 ± 7.0 years and time since lesion: 7.8 ± 5.7 years) were included. Regardless of muscle type, experimental RMS curves as a function of window size adhered to a first-order model, with high consistency across trials ( Conclusion: These findings demonstrate that reliable EMG normalization in spastic hemiparesis requires a minimal RMS window of approximately 200 ms during MVC and that unsmoothed EMG should be used to preserve signal amplitude. Methodological standardization using these parameters can improve the validity, reproducibility, and comparability of cocontraction indices across studies and may facilitate their application in clinical assessments and rehabilitation research in spastic paresis.
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