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Negative peak motor unit (MU) number estimates (MUNE) of the superior trapezius muscle. A: scatterplot representing the MUNE for each participant dependent on age (n = 20). B and C: near fiber (NF) MU potential overlay from the concentric needle and measurement from the decomposition-based quantitative electromyography algorithm between a young (B) and old (C) participant, respectively. the y-axis is 10 kV·s−2·division−1, and the x-axis is 1 ms/division.
