NCT01999595

The Antalgic Effect of Pulse Frequency and Pad Size of TENS on Blunt Pressure Pain

The Effect of Pulse Frequency and Pad Size of Transcutaneous Electrical Nerve Stimulation (TENS) on Experimental Blunt Pressure Pain in Healthy Participants

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 180 (actual)
• Sponsor: Chang Gung University · Academic / Other
• Sex: All
• Age: 18 Years – 26 Years
• Healthy volunteers: Accepted

Summary

The purpose of this study is to determine the antalgic of surface electrical stimulation with pulse frequencies and pad sizes on blunting pressure pain on healthy human due to various temporal and spatial summations of the stimulation.

Detailed description

Potential participants expressing interest in the study will be given to read the contraindications for the pain tests and the stimulation intervention, which has been documented on the consent form. All participants meeting entry requirements will be invited to participate in the experiments which take place on a separate occasion. Each participant will sign the consent form and will be told again that they can withdraw from the study at any time and without explanation. Each participant will be required to experience a 10-minute pre-stimulation period, a 30 minute TENS intervention, a 30 minute follow-up period. Participants will be seated on a chair with arm support provided by a side table. The investigator will be then informed the stimulation intervention and used pad size on the stimulation periods in written form contained in a sealed envelope. After the participant's verbal permission is obtained, the investigator will apply the pads on the dorsal forearm area. Either the large size pad, 5cm x 10cm, or the small size,2.5cm x 2.5cm, will be choose to place on the dorsal side of the forearm to straddle the site for blunt pressure pain. The muscle bellies of the forearm are mainly located on the proximal half part. The proximal pad will be attached to the lateral epi-condyle of the elbow, and the distal electrode will be placed 3cm distal to the proximal one along the line between the lateral part of elbow and the mid-point of the wrist. The pads will be then connected to the intervention stimulator. The investigator will relay instructions to the participants using cue cards displayed 30 seconds before any required action. Before each blunting pressure pain test, the participant will sit comfortably and place their right upper extremity on a side table with the shoulder abduction, elbow flexion, the forearm pronation. The test will be induced using a pressure algometer with a flat circular probe, measuring 1.1cm in diameter (1cm2 on skin surface). Force will be displayed digitally in increments of 0.1 Newton. The algometer will be applied to the mid-point between the intervention pads. The rate of the pressure algometer application will be around 6 Newtons per second on average. The participants will be asked to concentrate on the sensations in the forearm. When the pressure becomes definitely painful, the participant will state "Pain!" and the force will be stopped. The pain threshold will be taken twice in a minute for one test and each measurement will take no more than 30 seconds. There will be seven 1-minute tests performed in this experiment. The first test in pre-stimulation period. The second and third tests were administered and started at 9, 19, 29 minute time points in the stimulation-on period. A 30 minute post stimulation period will be then followed. Another 3 tests will be performed in this period in ten-minute intervals at 39, 49, 59 minute time points after the stimulation start.

Conditions

• Transcutaneous Electrical Nerve Stimulation
• Blunt Pressure Pain
• Pad Size
• Pulse Frequency
• Analgesia

Interventions

Type	Name	Description
DEVICE	Control TENS	Control TENS was the application of electrical stimulation via skin with no current
DEVICE	Sham TENS	Sham TENS was the application of electrical stimulation via skin with no current on the participant, who was told "TENS is at a turn-on level whether or not you feel it"
DEVICE	High frequency TENS with large pads	High frequency TENS was delivered on large electrodes
DEVICE	Low frequency TENS with large pads	Low frequency TENS was delivered on large electrodes
DEVICE	High frequency TENS with small pads	High frequency TENS was delivered on small electrodes
DEVICE	Low frequency TENS with small pads	Low frequency TENS was delivered on small electrodes

Timeline

• Start date: 2010-03-01
• Primary completion: 2013-05-30
• Completion: 2013-05-30
• First posted: 2013-12-03
• Last updated: 2021-12-22

Locations

1 site across 1 country: Taiwan