- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00655811
Ethnic Differences in Response to Topical Capsaicin: A Psychophysical Study on Healthy Subjects
August 9, 2018 updated by: Wake Forest University
The purpose of this research is to study how people respond differently to capsaicin in different racial groups and the effect it has on your pain levels.
Capsaicin is a natural product made from hot chili peppers that is useful for treating the itch symptoms of skin disease.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Detailed Description
To comprehensively evaluate the ethnic differences in response to topical capsaicin and its effect on thermal sensory thresholds.
Study Type
Interventional
Enrollment (Actual)
40
Phase
- Phase 4
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
-
-
North Carolina
-
Winston-Salem, North Carolina, United States, 27157
- Wake Forest University Health Sciences Dermatology
-
-
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
18 years to 50 years (ADULT)
Accepts Healthy Volunteers
Yes
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Adult men and women who are between 18 and 50 years of age.
- Subjects must be in general good health with no skin disease, disease state or physical condition which would impair evaluation of pain perception or which would increase their health risk by study participation as determined by the investigators.
- Women of childbearing potential will be required to have a negative pregnancy test in order to enroll in the study.
Exclusion Criteria:
- Adults over age 50.
- Children less than 18 years of age.
- Unable to complete the required measures.
- Diagnosis of diseases that would affect the measurement of pain perception.
- Currently enrolled in any investigational study in which the subject is receiving any type of drug, biologic, or non-drug therapy and subjects undergoing treatment with another investigational drug or approved therapy for investigational use within 30 days prior to study participation.
- Use of oral analgesic or other medications known to interfere with pain perception in the week prior to the study.
- Use of emollient on the forearms on the day of the study visit.
- Use of medicated topical preparations on the forearms for the week prior to the study.
- Known history of neuropathy causing diseases such as uremia.
- Known history of uncontrolled thyroid disease.
- Known history of diabetes mellitus.
- Allergy to capsaicin.
- Pregnant women.
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: BASIC_SCIENCE
- Allocation: RANDOMIZED
- Interventional Model: SINGLE_GROUP
- Masking: NONE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
ACTIVE_COMPARATOR: Capsaicin
Capsaicin 0.1% cream application to the volar side of forearm.
|
Topical application, 0.1%, Capzasin HP; Chattem Inc., Chattanooga, TN, U.S.A
Other Names:
|
PLACEBO_COMPARATOR: Placebo moisturizing cream
Placebo moisturizing cream with no active ingredient (Cetaphil; Galderma Laboratories LP, Fort Worth, TX, U.S.A.) to the opposite forearm.
|
Placebo moisturizing cream with no active ingredient (Cetaphil; Galderma Laboratories LP, Fort Worth, TX, U.S.A.)
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Ethnic Differences in Burning Pain Induced by Topical Capsaicin
Time Frame: 1 day
|
The primary endpoint is to test the burning pain effect of topical capsaicin by using an continuous visual analog scale (CoVAS) intensity scale as an outcome measure.
Participants will rate burning pain intensity after topical capsaicin application.
The burning or pain sensation intensity was recorded continuously on a 100-mm COVAS (0, no sensation to 100, maximum, strongest imaginable pain sensation).
The subjects were also asked to indicate whether they experienced any nonpainful sensation.
|
1 day
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Ethnic Differences on the Effects of Topical Capsaicin on Thermal Sensory Thermal Thresholds
Time Frame: 1 day
|
A secondary endpoint is to see if topical capsaicin has an effect on warm and heat pain thresholds.
Quantitative thermosensory testing was carried out using the Medoc TSA 2001 (Medoc Ltd).
The probe baseline temperature was 32 °C and the contact area was 12 cm2.
The probe warmed the skin surface at a linear rate of 0·4 °C per second, up to a cut-off of 50 °C.
Thermal thresholds were measured in the following order: warmth sensation threshold was measured followed by heat pain detection threshold; each of them was determined four times by the ascending method of limits.
|
1 day
|
The Difference in Burning/Pain Sensation Ratings Between the Capsaicin or Placebo Application.
Time Frame: 1 day
|
This secondary outcome is to see if subjects rated burning/pain differently between the topical capsaicin or placebo application.
Participants will rate burning/pain intensity after topical capsaicin and placebo application.
The burning/pain sensation intensity was recorded continuously on a 100-mm COVAS (0, no sensation to 100, maximum, strongest imaginable burning/pain sensation).
The subjects were also asked to indicate whether they experienced any non-burning/-painful sensation.
|
1 day
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start
February 1, 2008
Primary Completion (ACTUAL)
August 1, 2008
Study Completion (ACTUAL)
October 1, 2009
Study Registration Dates
First Submitted
April 4, 2008
First Submitted That Met QC Criteria
April 9, 2008
First Posted (ESTIMATE)
April 10, 2008
Study Record Updates
Last Update Posted (ACTUAL)
September 10, 2018
Last Update Submitted That Met QC Criteria
August 9, 2018
Last Verified
August 1, 2018
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 00003739
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
NO
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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