About this trial
The goal of this clinical trial is to learn whether adding high-intensity electromyostimulation (Hi-EMS) to capacitive and resistive electric transfer (TECAR) therapy improves pain and functional performance in adults with chronic nonspecific low back pain. The main questions it aims to answer are:
* Does adding Hi-EMS to TECAR therapy reduce low back pain at rest? * Does adding Hi-EMS reduce pain during the Five-Times-Sit-to-Stand Test? * Does adding Hi-EMS improve pressure pain threshold and performance on the - Five-Times-Sit-to-Stand Test?
Researchers will compare TECAR therapy delivered with Hi-EMS to TECAR therapy delivered without Hi-EMS.
Participants will:
* Receive both treatment conditions in a randomized order * Wait one week between treatment sessions * Receive 10 minutes of capacitive electrical transfer followed by 10 minutes of resistive electrical transfer during each session * Receive Hi-EMS during the 10-minute resistive electrical transfer phase in one of the sessions * Complete pain, pressure pain threshold, and functional performance assessments immediately before and after each session
Eligibility criteria
This trial does not accept healthy volunteersQualifiers
21 to 60 years old
chronic nonspecific low back pain
minimum pain intensity of 3 on a 0-10 scale
be able to provide consent and comply with study procedures
Disqualifiers
spinal fracture
tumor
radiculopathy
neurological or vascular condition
Trial design
Crossover
Treatments tested in this trial
TECAR Therapy plus Hi-EMS
DeviceTECAR therapy will be delivered using the BACK4 system (Winback Europa SAS, Biarritz, France). The intervention will consist of 10 minutes of capacitive electrical transfer (CET) followed by 10 minutes of resistive electrical transfer (RET). A conductive cream will be applied to the treatment area, and a return plate will be positioned over the abdomen. The Hi-EMS Focal mode will be activated only during the 10-minute RET phase and adjusted to produce a strong but comfortable stimulation without pain or excessive discomfort.
Tecar therapy alone
DeviceTECAR therapy will be delivered using the BACK4 system (Winback Europa SAS, Biarritz, France). The intervention will consist of 10 minutes of capacitive electrical transfer (CET) followed by followed by 10 minutes of resistive electrical transfer (RET). A conductive cream will be applied to the treatment area, and a return plate will be positioned over the abdomen. Hi-EMS will not be activated during this condition.
Treatment groups
Trial outcomes
Primary outcomes
Pain intensity at rest
Low back pain intensity at rest will be assessed using an 11-point Numerical Pain Rating Scale (NPRS), ranging from 0 ("no pain") to 10 ("worst pain imaginable"). Participants will rate their current low back pain while at rest before performing the functional test. Higher scores indicate greater pain intensity.
Movement-Evoked Pain Intensity
Movement-evoked low back pain intensity will be assessed immediately after the Five-Times-Sit-to-Stand Test using an 11-point Numerical Pain Rating Scale (NPRS), ranging from 0 ("no pain") to 10 ("worst pain imaginable"). Participants will rate the greatest low back pain experienced while performing the test. Higher scores indicate greater pain intensity.
Secondary outcomes
Pressure pain threshold
A computerized digital pressure algometer (AlgoMed, Medoc Ltd.) with a 1-cm² probe will assess lumbar pressure pain threshold (PPT). Pressure will be applied at 40 kPa/s, and participants will press a response button when the sensation first becomes painful. PPT will be measured three times bilaterally at sites 5 cm lateral to the L3 and L5 spinous processes, with 30-second intervals. The measurements will be averaged to obtain a single lumbar PPT value at each assessment.
Five-Times-Sit-to-Stand Test
Functional performance will be assessed using the Five-Times-Sit-to-Stand Test. Participants will be instructed to complete five consecutive sit-to-stand repetitions as quickly and safely as possible. The time required to complete five repetitions will be measured using a stopwatch. The test will be performed twice, and the mean completion time of the two trials will be used for analysis.
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