Sensory, motor, and pain thresholds for stimulation with medium frequency alternating current

Archives of Physical Medicine and Rehabilitation
Alex R Ward, Valma J Robertson

Abstract

To investigate the effect of frequency of alternating current on the sensory, motor, and pain thresholds in normal subjects, and to establish the optimal frequency for motor stimulation with minimal subject discomfort. A repeated measures design using two groups of 11 subjects. A laboratory setting was used. Participants were volunteers who met the inclusion criteria. Alternating current with 20 different carrier frequencies between 1 and 35 kHz, all modulated at 50 Hz, was applied to each subject on two separate occasions. For half the subjects, the frequency was increased or decreased sequentially (reversed on second occasion), and for the other half, it was applied in a different random order on each occasion. The voltage at the sensory threshold was recorded for each applied frequency. This was subsequently repeated for motor and pain thresholds. Sensory, motor, and pain thresholds decreased with increasing frequency between 1 kHz and approximately 10 kHz. Above 10 kHz, the thresholds increased. The ratio pain threshold/sensory threshold increased systematically with increasing frequency over the range examined. By contrast, the ratio pain threshold/motor threshold showed a distinct maximum at a frequency of 10 kHz. Marked ...Continue Reading

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Citations

Mar 22, 2001·Medical Engineering & Physics·A R Ward, V J Robertson
Aug 10, 2010·Burns : Journal of the International Society for Burn Injuries·Yuko S SchmittSam R Sharar
Nov 12, 2015·The Journal of Orthopaedic and Sports Physical Therapy·Wayne ScottColin Ziegenbein
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Apr 4, 2015·Medical & Biological Engineering & Computing·Mahsa Agharezaee, Amin Mahnam
Nov 20, 1998·Archives of Physical Medicine and Rehabilitation·A R Ward, V J Robertson
Apr 11, 2001·Archives of Physical Medicine and Rehabilitation·D A HurleyD G Baxter
Nov 28, 2006·Augmentative and Alternative Communication : AAC·Shelley K Lund, Janice Light
Feb 21, 2019·Neuromodulation : Journal of the International Neuromodulation Society·Víctor M López-ÁlvarezXavier Navarro
Jun 19, 2017·Neuropsychology Review·Ahmed F FasfousMiguel Pérez-García
Nov 23, 2006·Augmentative and Alternative Communication : AAC·Bruce Hamm, Pat Mirenda
Jul 6, 2018·Experimental Brain Research·Toshiro UmezakiShigeru Hirano
Aug 22, 2018·Journal of Neuroengineering and Rehabilitation·Yushin KimHyung-Soon Park
Aug 28, 2012·Archives of Physical Medicine and Rehabilitation·Roberta Ceila VenancioRichard Eloin Liebano
Apr 14, 2021·Brain Stimulation·Gavin HsuLucas C Parra

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