Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13095
Title: Alternating frequencies of transcutaneous electric nerve stimulation : does it produce greater Analgesic Effects on mechanical and thermal pain thresholds?
Authors: Tong, KC
Lo, SK
Cheing, GL 
Keywords: Pain
Rehabilitation
Transcutaneous electric nerve stimulation
Issue Date: 2007
Publisher: W.B. Saunders
Source: Archives of physical medicine and rehabilitation, 2007, v. 88, no. 10, p. 1344-1349 How to cite?
Journal: Archives of physical medicine and rehabilitation 
Abstract: Tong KC, Lo SK, Cheing GL. Alternating frequencies of transcutanenous electric nerve stimulation: does it produce greater analgesic effects on mechanical and thermal pain thresholds? Objective: To determine whether alternating frequency transcutaneous electric nerve stimulation (TENS) at 2 and 100Hz (2/100Hz) has a more potent hypoalgesic effect than a fixed frequency at 2 or 100Hz in healthy participants. Design: A single-blind randomized controlled trial with a convenience sample. Setting: University physiotherapy department. Participants: Sixty-four healthy volunteers (32 men [mean age, 28.1±5.9y], 32 women [mean age, 27.7±5.6y]) were recruited and randomly divided into 4 groups. Interventions: The 4 groups received TENS delivered at (1) 2Hz; (2) 100Hz; (3) 2/100Hz alternating frequency; and (4) no treatment (control group), respectively. Electric stimulation was applied over the anterior aspect of the dominant forearm for 30 minutes. Main Outcome Measures: Mechanical pain thresholds (MPTs) and heat pain thresholds (HPTs) were recorded before, during, and after TENS stimulation. The data were analyzed using linear mixed models, with group treated as a between-subject factor and time a within-subject factor. Results: During and shortly after electric stimulation, HPT increased significantly in the alternating frequency stimulation group (P=.024). MPT increased significantly in both the 100Hz (P=.008) and the alternating frequency groups (P=.012), but the increase was substantially larger in the 100Hz group. Conclusions: Alternating frequency stimulation produced a greater elevation in the HPT, but a greater increase in the MPT was achieved using 100Hz stimulation.
URI: http://hdl.handle.net/10397/13095
ISSN: 0003-9993
EISSN: 1532-821X
DOI: 10.1016/j.apmr.2007.07.017
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