Abstract:
OBJECTIVE:The aim of this study was to investigate the effect of neuromuscular electrical stimulation burst duty cycle (BDC) and current type (sinusoidal alternating current [sAC] vs. rectangular alternating current [rAC]) on the electrically induced isometric torque (EIT) and discomfort. Pulsed current (PC) stimulation, which corresponds to one pulse rAC, was included in testing. DESIGN:A repeated-measures design was used. The left quadriceps of 22 healthy subjects (mean ± SD age, 33 ± 8 yrs) were stimulated alternately with sAC and rAC current bursts (4-kHz carrier frequency; 71 bursts per second burst frequency) to produce isometric contractions. A range of BDCs were tested for sAC (7%-50%) and rAC (2%-18%) stimulation at fixed intensities while EIT and discomfort were recorded. BDC presentation order was randomized. RESULTS:Overall, both current types elicited peak EIT at ∼14% BDC (range, 7%-21%). Significantly more EIT was produced by rAC than by sAC stimulation (P < 0.005). Discomfort increased with BDC and was similar for both current types. CONCLUSIONS:The study confirmed previous findings that conventional sAC stimulation (50% BDC) and pulsed current stimulation (rAC with 2% BDC) used in sports and rehabilitation produce similar EIT levels. However, rAC stimulation at low BDC (7%-18%) was more effective (+35% torque produced with similar discomfort) than pulsed current or conventional sAC.
journal_name
Am J Phys Med Rehabiljournal_title
American journal of physical medicine & rehabilitationauthors
Szecsi J,Fornusek Cdoi
10.1097/PHM.0000000000000008subject
Has Abstractpub_date
2014-02-01 00:00:00pages
146-59issue
2eissn
0894-9115issn
1537-7385journal_volume
93pub_type
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journal_title:American journal of physical medicine & rehabilitation
pub_type: 临床试验,杂志文章
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journal_title:American journal of physical medicine & rehabilitation
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pub_type: 临床试验,杂志文章,随机对照试验
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journal_title:American journal of physical medicine & rehabilitation
pub_type: 临床试验,杂志文章
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