Assessment of age-related differences in decomposition-based quantitative EMG in the intrinsic hand muscles: A multivariate approach.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
Philemon TsangDouglas C Ross

Abstract

Decomposition-based quantitative electromyography (DQEMG) is one method of measuring neuromuscular physiology in human muscles. The objective of the current study is to compare the neuromuscular physiology of a typical aging population in the intrinsic hand muscles. Measurements of DQEMG were detected with a standard concentric needle and surface EMG from the intrinsic hand muscles. DQEMG was obtained from the first dorsal interosseous (FDI), the abductor digiti minimi (ADM) and fourth dorsal interosseous (4DI). Multivariate analysis of variance (MANOVA) were performed for the surface and intramuscular EMG measures to identify age differences in motor unit properties. Large differences were observed between the age groups for the canonical intramuscular and surface EMG variables. Older adults demonstrated a large decrease in motor unit number estimation in the ADM and FDI. Likewise, medium to large decreases in motor unit stability were observed in the FDI, ADM and 4DI. With aging, there are decreases in motor unit number estimation and stability in the intrinsic hand muscles. Using a multivariate approach allows for age-related differences and the relationship between the variables to be further elucidated. Multivariate analys...Continue Reading

Citations

Jun 24, 2020·Journal of Hand Therapy : Official Journal of the American Society of Hand Therapists·Philemon TsangDouglas C Ross

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