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Does display sensitivity influence motor latency determination?

Nobushige Takahashi1, Lawrence R Robinson

  • 1Department of Rehabilitation Medicine, University of Washington School of Medicine, Box 356380, 1959 NE Pacific Street, Seattle, Washington 98195, USA. nobushige-t@umin.ac.jp

Muscle & Nerve
|October 10, 2009
PubMed
Summary
This summary is machine-generated.

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Display sensitivity significantly impacts compound muscle action potential (CMAP) onset latency measurements. Consistent display sensitivity is crucial for reliable motor latency assessments in clinical electrophysiology.

Area of Science:

  • Neurology
  • Neurophysiology
  • Biomedical Engineering

Background:

  • Display sensitivity is a known factor influencing the measurement of compound muscle action potential (CMAP) onset latency.
  • Accurate latency measurements are critical for diagnosing and monitoring neuromuscular disorders.

Purpose of the Study:

  • To compare the intrarater and interrater reliability of CMAP onset latency measurements using two different display sensitivities.
  • To quantify the influence of display sensitivity on motor latency values.

Main Methods:

  • Seven raters marked median CMAP onset points from 24 patients' recordings.
  • Recordings were printed at two display sensitivities: 5 mV/division and 0.5 mV/division.
  • Onset latencies were measured, and intraclass correlation coefficients (ICCs) were calculated for reliability analysis.

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Last Updated: Jun 19, 2026

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Main Results:

  • Excellent intrarater repeatability was observed within a single display sensitivity setting.
  • Intrarater reliability was poor when using two different sensitivity settings.
  • High interrater reliability was achieved at both 0.5 mV/division (ICC=0.93) and 5 mV/division (ICC=0.91).
  • Latencies measured at 5 mV/division were approximately 0.3 ms longer on average compared to 0.5 mV/division.

Conclusions:

  • While latency measurement reliability is excellent at either tested sensitivity, consistency is paramount.
  • Using a consistent display sensitivity setting is essential to prevent measurement errors in clinical practice.
  • Standardizing display sensitivity can improve the diagnostic accuracy and comparability of electrophysiological studies.