Variability in commercial electromyographic biofeedback devices

John D. Rugh, Robert L. Schwitzgebel

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The purpose of this study was to evaluate the functional characteristics of a sample of commercial electromyographic feedback devices for the purpose of determining variability between instruments. Seventeen physical and functional characteristics (such as input impedance, filter bandwidth, and sensitivity) were evaluated on a sample of 11 instruments. Wide variability was found in several important functional characteristics. Input impedance, for example, was found to vary from 13K to more than 1 megohm and filter bandwidths ranged from 55 Hz to 2,600 Hz. Such variability makes the comparison of data from studies using different instruments quite difficult; it also suggests the need to develop equipment standards and common calibration procedures.

Original languageEnglish (US)
Pages (from-to)281-285
Number of pages5
JournalBehavior Research Methods & Instrumentation
Issue number3
StatePublished - May 1977
Externally publishedYes

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Developmental and Educational Psychology
  • Arts and Humanities (miscellaneous)
  • Psychology (miscellaneous)
  • Psychology(all)


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