Myofascial pain syndrome (MPS) is present in up to 87% of the patients that present pain. MPS usually presents painful myofascial trigger points (MTrPs). One methodology used to quantify the pain in MPS is the algometry, which measures the pressure pain threshold (PPT). Invasive techniques in physiotherapy have become popular in the last years due to their clinical efficacy and evidence. Percutaneous Microelectrolysis (MEP®) and dry needling are techniques that are already in use for this syndrome. MEP® is a technique that employs a galvanic current up to 990 microAmperes, which is applied percutaneously with an acupuncture needle connected to the cathode. It is also known as low intensity percutaneous electrolysis. The aim of this study is to compare the effects in pain and muscle tone (measured with algometry and surface electromyography) of invasive techniques. Healthy subjects between 18 to 48 years old, both sex, presenting MTrPs in upper trapezius will be recruited. The secondary objectives are to determine the discomfort degree of each technique and if it is better to use MEP® with a fixed dose or with an algorithm in which the dose varies. The hypothesis, according to our previous studies, is that MEP® generates higher changes in PPT.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
60
An acupuncture needle of 0.3 x 25 mm will be introduced perpendicularly into the upper trapezius trigger point. A movement with the needle will be done at 1 Hz for 120 seconds.
Cathodic low intensity percutaneous electrolysis will be applied through an acupuncture needle of 0.3 x 25 mm in the upper trapezius trigger point. A movement with the needle will be done at 1 Hz with an intensity of 600 micro-Amperes. If the patient refers discomfort, the procedure will be stopped and resumed totalling 120 seconds (total dose of 72 mC).
An acupuncture needle of 0.3 x 25 mm will be introduced perpendicularly into the upper trapezius trigger point for 120 seconds.
Cathodic low intensity percutaneous electrolysis will be applied through an acupuncture needle of 0.3 x 25 mm in the upper trapezius trigger point. The therapy will be done statically with an intensity of 600 micro-Amperes. If the patient refers discomfort, the procedure will be stopped and resumed totalling 120 seconds (total dose of 72 mC).
Cathodic low intensity percutaneous electrolysis will be applied through an acupuncture needle of 0.3 x 25 mm in the upper trapezius trigger point. The therapy will be done statically, at 600 micro-Amperes. If the patient refers discomfort, the procedure will be stopped and resumed. Treatment will finish when the patient does not refer any discomfort for a period longer than 60 seconds. Total dose in mC will be registered.
An acupuncture needle of 0.3 x 25 mm will be introduced perpendicularly up to 3 mm deep into the upper trapezius trigger point for 120 seconds.
Universidad Maimónides
Buenos Aires, Buenos Aires F.D., Argentina
RECRUITINGPressure Pain Threshold (PPT) - Baseline
Algometry is used to measure the Pressure Pain Threshold (PPT). PPT is defined as the minimum force applied which induces pain. It will be applied in the Myofascial Trigger points.
Time frame: Baseline
Pressure Pain Threshold (PPT) - 10 minutes
Algometry is used to measure the Pressure Pain Threshold (PPT). PPT is defined as the minimum force applied which induces pain. It will be applied in the Myofascial Trigger points.
Time frame: 10 minutes
Pressure Pain Threshold (PPT) - 24 hours
Algometry is used to measure the Pressure Pain Threshold (PPT). PPT is defined as the minimum force applied which induces pain. It will be applied in the Myofascial Trigger points.
Time frame: 24 hours
Pressure Pain Threshold (PPT) - 48 hours
Algometry is used to measure the Pressure Pain Threshold (PPT). PPT is defined as the minimum force applied which induces pain. It will be applied in the Myofascial Trigger points.
Time frame: 48 hours
Pressure Pain Threshold (PPT) - Day 7
Algometry is used to measure the Pressure Pain Threshold (PPT). PPT is defined as the minimum force applied which induces pain. It will be applied in the Myofascial Trigger points.
Time frame: Day 7
Surface electromyography at rest - Baseline
Electromyography (EMG) is used to measure muscular electrical activity at rest to determine the basal tone. Peak voltage and root mean square (RMS) voltage will be informed.
Time frame: Baseline
Surface electromyography at rest - 10 minutes
Electromyography (EMG) is used to measure muscular electrical activity at rest to determine the basal tone. Peak voltage and root mean square (RMS) voltage will be informed.
Time frame: 10 minutes
Surface electromyography at rest - 24 hours
Electromyography (EMG) is used to measure muscular electrical activity at rest to determine the basal tone. Peak voltage and root mean square (RMS) voltage will be informed.
Time frame: 24 hours
Surface electromyography at rest - 48 hours
Electromyography (EMG) is used to measure muscular electrical activity at rest to determine the basal tone. Peak voltage and root mean square (RMS) voltage will be informed.
Time frame: 48 hours
Surface electromyography at rest - Day 7
Electromyography (EMG) is used to measure muscular electrical activity at rest to determine the basal tone. Peak voltage and root mean square (RMS) voltage will be informed.
Time frame: Day 7
Surface electromyography at maximum voluntary contraction - Baseline
Electromyography (EMG) is used to measure muscular electrical activity at maximum voluntary contraction to determine the recruitment. Peak voltage and RMS voltage will be informed.
Time frame: Baseline
Surface electromyography at maximum voluntary contraction - 10 minutes
Electromyography (EMG) is used to measure muscular electrical activity at maximum voluntary contraction to determine the recruitment. Peak voltage and RMS voltage will be informed.
Time frame: 10 minutes
Surface electromyography at maximum voluntary contraction - 24 hours
Electromyography (EMG) is used to measure muscular electrical activity at maximum voluntary contraction to determine the recruitment. Peak voltage and RMS voltage will be informed.
Time frame: 24 hours
Surface electromyography at maximum voluntary contraction - 48 hours
Electromyography (EMG) is used to measure muscular electrical activity at maximum voluntary contraction to determine the recruitment. Peak voltage and RMS voltage will be informed.
Time frame: 48 hours
Surface electromyography at maximum voluntary contraction - Day 7
Electromyography (EMG) is used to measure muscular electrical activity at maximum voluntary contraction to determine the recruitment. Peak voltage and RMS voltage will be informed.
Time frame: Day 7
Visual Analogue Scale of the procedure
To determine how unpleasant the procedure is, the visual analog scale (VAS) will be used. Expresed in centimeters. Minimum value: 0 Maximum value: 10 A higher score implicates a worse outcome.
Time frame: Immediately after the intervention
Post-needling soreness
To determine how unpleasant the post-needling soreness is, a pain diary with the visual analog scale (VAS) will be used. The patient will register the pain intensity in the needle area. Expresed in centimeters. Minimum value: 0 Maximum value: 10 A higher score implicates a worse outcome.
Time frame: Four times per day (in the morning, before lunch, in the afternoon, and in the evening) during the seven days following intervention.
Dose
To determine the amount of electric charge applied, the millicoulombs (mC) informed in the MEP device will be recorded.
Time frame: Immediately after the intervention
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