METHOD NOTES / Arm EMG

Record muscle activity.

How does gripping and releasing a ball become an analyzable record?

01Grip and release

02Arm EMG

03Align with EEG in time

Method illustration, not measured results

What it records

Surface EMG records electrical signals associated with muscle activity. It helps observe activity timing and changes, but does not directly establish sleep state.

Its role in this study

In this project, participants grip and release a soft ball with their breathing. Arm EMG records associated muscle activity for comparison with synchronized EEG after lights off. This explains the method relationship; EMG values with insufficiently verified units are not plotted here.

Before interpreting

Electrode placement, contact quality, motion artifacts and analysis affect recordings. Failure to grip does not establish sleep, nor does EMG change alone prove product efficacy. The reference explains general principles and does not identify the equipment used in this study.

Reference: PLUX — Electromyography user manual ↗

Method note · 2026-09-09. Story graphics explain the approach; they are not client measurements.

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