Reliability of Low-Density Multi-Channel Electromyography in Assessing Quadriceps Femoris Muscle Excitation

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The aim is to assess the reliability of low-density multi-channel EMG (LDmEMG) in measuring quadriceps muscle activity across different sessions.
Involves seven asymptomatic participants performing maximum voluntary isometric contractions.
Two measurement sessions were conducted one week apart.
A 64-channel LDmEMG grid was used to assess muscle excitation.
Ultrasound identified borders of rectus femoris, vastus medialis, and vastus lateralis.
Good to excellent intra- and inter-session reliability for overall quadriceps, rectus femoris, and vastus medialis (ICC values 0.84–0.93).
Single-channel reliability showed moderate to excellent inter-session reliability, with values from 0.52 to 0.96, but the distal rectus femoris had poor reliability (value not reported).

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Evaluates the reliability of low-density multi-channel EMG for muscle assessment in asymptomatic individuals, indicating its potential effectiveness.

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Tayfur et al. (2026) studied this question.

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