The goal of this clinical trial is to examine the effect of vagus nerve stimulation (VNS) on chronic, widespread pain in adults. The study will also evaluate which method of VNS-electrical ear stimulation or deep exhalation breathing-has a more significant impact on pain intensity, quality of life, and emotional well-being. The main questions it aims to answer are: Does vagus nerve stimulation reduce pain intensity in individuals with chronic, widespread pain? Which intervention-electrical ear stimulation or deep exhalation breathing-provides a greater improvement in autonomic function, emotional status, and quality of life? Researchers will compare two active interventions-electrical ear stimulation and deep exhalation breathing-to a no-treatment control group to determine relative effectiveness on pain and related outcomes. Participants will: Be randomly assigned to one of three groups: * Electrical Ear Stimulation: Apply a small, non-invasive device to the ear for 20 minutes, twice daily for two weeks. * Deep Exhalation Breathing: Perform balloon-blowing exercises (four deep exhalations per set) once every waking hour each day for two weeks. * Control Group: Receive no intervention during the two-week period. These participants will complete baseline testing, return after two weeks for follow-up testing, and then be debriefed. They will have the option to withdraw or receive an active treatment after study data collection concludes. Complete four questionnaires to assess pain, emotional state, and quality of life. Undergo physiological assessments including heart rate variability, neck muscle tissue flexibility (via MyotonPro), and pressure pain sensitivity (via pressure algometer), both before and after the 2-week period. Participation includes two in-person sessions (approximately 1 hour each) and daily home practice (for intervention groups) lasting 40-60 minutes per day for two weeks. The study involves minimal risk, and no compensation is provided. Participation is voluntary, and confidentiality will be strictly maintained.
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Pain Intensity
Timeframe: From enrollment to the end of treatment at 2 weeks
Muscle stiffness
Timeframe: Frome enrollment to the end of treatment at 8 weeks
Pressure Pain Threshold - Trapezius muscle
Timeframe: From enrollment to the end of treatment period at 2 weeks
SDNN (Standard Deviation of NN intervals)
Timeframe: From enrollment to the end of treatment at 2 weeks
Mechanical Stress Relaxation Time
Timeframe: From enrollment to the end of treatment at 8 weeks
Muscle Oscillation Frequency
Timeframe: From enrollment to the end of treatment at 8 weeks.
Pressure Pain Threshold - Lumbar Paraspinal Muscles
Timeframe: From enrollment to the end of treatment at 8 weeks
Pressure Pain Threshold - Calf Muscles
Timeframe: From enrollment to the end of treatment at 8 weeks
Muscle Elasticity (Logarithmic Decrement)
Timeframe: From enrollment to the end of treatment at 8 weeks
RMSSD (Root Mean Square of Successive Differences)
Timeframe: Baseline, after 2 weeks and after 8 weeks
SDANN (Standard Deviation of Average NN intervals)
Timeframe: Baseline, after 2 weeks, and after 8 weeks
LF Power (Low Frequency Power)
Timeframe: Baseline, after 2 weeks and after 8 weeks
HF Power (High Frequency Power)
Timeframe: Baseline, after 2 weeks and after 8 weeks
LF/HF Ratio
Timeframe: Baseline, after 2 weeks and after 8 weeks
VLF Power (Very Low Frequency Power)
Timeframe: Baseline, after 2 weeks and after 8 weeks
ULF Power (Ultra Low Frequency Power)
Timeframe: Baseline, after 2 weeks and after 8 weeks