NCT06225817 · University of Maryland, Baltimore
Placebo Impacts Sleep and Pain Modulation in Chronic Pain
What this study is about
The goal of this free-choice parallel design clinical trial is to examine the potential beneficial effects of using where both patients and doctors know the treatment given placebo (OLP) in improving chronic pain related outcomes and sleep quality in people with temporomandibular disorders.
View original scientific description
The goal of this free-choice parallel design clinical trial is to examine the potential beneficial effects of using open-label placebo (OLP) in improving chronic pain related outcomes and sleep quality in people with temporomandibular disorders. This study will enroll a cohort of participants with temporomandibular disorders (TMD) which lasts for more than 3 months. The main questions it aims to answer are: 1. Will participants with TMD be more likely to take open-label placebo pills if they are introduced to the effects of placebo (e.g., going through an expectation management session)? 2. Will taking open-label placebo plus expectation management improve chronic pain related outcomes, such as chronic pain intensity, interference, levels of anxiety and depression, in the cohort of TMD? 3. Will open-label placebo plus expectation management improve sleep quality in participants suffering from TMD? To answer the above questions, participants with TMD will be randomly assigned to three groups: 1. Open-label placebo plus expectation management group, where participants will complete a 1-hour discussion session about their expectations toward open-lable placebo intervention, and then take 1 open-labe placebo pill per day for a total of 45 days. 2. Open-label placebo only group where participants will be asked to take open-label placebo pills, one pill per day, for a total of 45 days. 3. standard of care group where participants will maintain their usual care without introducing open-label placebo to them during the 45 days monitoring. Researchers will compare the chronic pain intensity, interference, mood, anxiety, and sleep quality between the open-label placebo group and the wait-list group. Daily chronic pain will be measured using visual analog scale (VAS) ranging from 0=no pain at all to 100=maximum tolerable pain. Chronic pain interference using Patient-Reported Outcomes Measurement Information System (PROMIS) pain interference and pain behavior. Anxiety and depression will be measured using PROMIS-anxiety, and PROMIS-depression scales respectively. Finally, sleep quality will be quantified using the objective measurement Motion Watch during the 45 days intervention and monitoring. In order to have a rigorous measurement of the baseline pain and sleep fluctuation, this study will include a 7-day phenotyping period before the starting of the 45-day intervention and monitoring. During the 7-day phenotyping period, participants will record their daily chronic pain and sleep quality using polysomnography.
Interventions
DIETARY_SUPPLEMENT
Open-label placebo pills
The placebo pills in this study are empty capsules without any ingredients inside. The capsules are made of microcrystalline cellulose.
Primary outcome measures
Chronic pain intensity
Time frame: Daily over the 45 days
Chronic pain intensity will be measured using visual analog scale ranging from 0=no pain at all to 100=maximum tolerable pain
Sleep efficiency
Time frame: Daily over the 45 days
Sleep efficiency will be measured using actigraphy motion watch ranging from 0%=efficient at all to 100% maximum efficient sleep
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Age ( 18-88 years old)
- English speaker (written and spoken)
- TMD for at least 3 months
- Grade Chronic Pain Scale (GCPS) ≥1
- Smartphone/text messaging capability
Exclusion criteria
- Present or past degenerative neuromuscular disease
- Cardiovascular, neurological diseases, pulmonary abnormalities, kidney disease, liver disease, history of cancer within past 3 years
- Any personal (or family first degree) history of mania, schizophrenia, or other psychoses
- Severe psychiatric condition (e.g. schizophrenia, bipolar disorders, autism) leading to hospitalization within the last 3 years.
- Lifetime alcohol/drug dependence or alcohol/drug abuse in past 3 months
- Pregnancy or breast feeding
- Impaired or uncorrected hearing
Where
- Baltimore, Maryland
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jun 17, 2026 · Source of record for eligibility and locations