Prevalence of Chapman Reflex Points in Medical Students and Their Association With Visceral Symptoms

Chapman Reflex Points (CRPs) are small palpable nodules found within connective tissue that have traditionally been associated with dysfunction of internal organs and the autonomic nervous system. However, little is known about how commonly these findings occur in healthy individuals or whether they are associated with symptoms experienced by otherwise healthy people.

The purpose of this study is to determine the prevalence of Chapman Reflex Points in young healthy adults and to evaluate whether the presence and distribution of these points are associated with self-reported visceral symptoms. Participants complete a standardized health questionnaire regarding recent and recurrent symptoms and undergo a blinded physical examination of established Chapman Reflex Point locations performed by a trained investigator. The results of this study may improve understanding of the physiological mechanisms underlying Chapman Reflex Points and help clarify their potential role in preventive osteopathic assessment and early identification of altered autonomic, lymphatic, fascial, or neuroendocrine function.

Study Overview

• Status: Completed
• Conditions: Lymphatic Diseases; Healthy; Autonomic Nervous System Diseases; Somatic Dysfunction; Chapman Reflex Points
• Intervention / Treatment: Procedure: Chapman Reflex Point Examination

Detailed Description

Chapman Reflex Points (CRPs) are discrete palpable nodules located within deep fascial tissues that have historically been interpreted as viscerosomatic reflex manifestations associated with dysfunction of specific internal organs. Traditional osteopathic models suggest that CRPs develop secondary to altered autonomic activity and lymphatic dysfunction resulting from visceral pathology. More recent mechanobiological investigations have proposed that fascial contractility mediated by myofibroblasts, sympathetic regulation of lymphatic vessel function, connective tissue remodeling, and neuroendocrine influences may contribute to the formation and persistence of these palpable findings.

Despite their longstanding use in osteopathic diagnosis and treatment, there is limited evidence regarding the prevalence of CRPs in healthy individuals, and relatively few studies have investigated whether the presence of CRPs correlates with self-reported visceral symptoms in populations without significant underlying disease. Improved characterization of CRP prevalence and symptom associations may provide insight into whether these findings represent markers of overt pathology, subclinical physiological modulation, or normal biological variation.

This study was designed as a cross-sectional observational investigation to evaluate the prevalence and distribution of CRPs in a young adult population and to explore potential relationships between CRP findings and participant-reported visceral symptoms. Participants completed a standardized health questionnaire designed to assess demographic characteristics, medical history, lifestyle factors, and recent or recurrent symptoms across multiple organ systems. Following questionnaire completion, participants underwent a systematic palpatory examination of established Chapman Reflex Point locations performed by a single trained investigator who was blinded to questionnaire responses. Consistent palpatory techniques, including standardized pressure application and examination duration, were utilized to improve examination reproducibility.

Participant data were recorded using anonymized study identification numbers to maintain confidentiality. Statistical analyses were performed using Microsoft Excel and STATA software. Descriptive statistics were used to characterize participant demographics and CRP prevalence. Sex-based differences in total CRP counts were evaluated using Welch's two-sample t-test. Associations between individual Chapman Reflex Points and symptom clusters were assessed using stepwise regression analyses, while relationships between grouped CRPs and grouped visceral symptom scores were examined using bivariate linear regression techniques. Statistical significance was defined as a two-sided p-value of less than 0.05.

The findings from this study are intended to contribute to a contemporary understanding of Chapman Reflex Point physiology by integrating concepts related to autonomic regulation, lymphatic function, fascial mechanotransduction, and endocrine modulation. Further investigation may help clarify the potential utility of CRPs as markers of early physiological alterations and inform their role in preventive osteopathic assessment and individualized patient evaluation.

• Study Type: Observational
• Enrollment (Actual): 101

Contacts and Locations

Study Locations

• United States
  • New York
    • New York, New York, United States, 10027
      • Touro College of Osteopathic Medicine - Harlem

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: Yes

• Sampling Method: Non-Probability Sample

Study Population

Young adult volunteers recruited from an osteopathic medical school community participated in this cross-sectional observational study. Participants completed a standardized questionnaire assessing demographic characteristics, medical history, lifestyle factors, and recent or recurrent visceral symptoms, followed by a blinded palpatory examination of established Chapman Reflex Point locations performed by a trained investigator. A total of 101 participants were enrolled, with a mean age of 27 years.

Description

Inclusion Criteria:

• Adults aged 18 years or older.
• Ability to understand the study procedures and provide informed consent.
• Willingness to complete a standardized health questionnaire.
• Willingness to undergo a blinded palpatory examination of established Chapman Reflex Point locations.

Exclusion Criteria:

• Individuals younger than 18 years of age.
• Inability or unwillingness to provide informed consent.
• Inability or unwillingness to complete the health questionnaire.
• Inability or unwillingness to undergo the palpatory examination.
• Pregnancy.
• Incomplete study data or questionnaire responses.

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort

Intervention / Treatment

Healthy Young Adults; Participants were young adults who completed a standardized health questionnaire assessing demographic characteristics, medical history, lifestyle factors, and recent or recurrent visceral symptoms. Participants subsequently underwent a blinded palpatory examination of established Chapman Reflex Point locations performed by a trained investigator. No therapeutic intervention was administered. The study evaluated the prevalence and distribution of Chapman Reflex Points and their associations with self-reported visceral symptom clusters.

Procedure: Chapman Reflex Point Examination; Participants underwent a standardized palpatory examination of established Chapman Reflex Point locations performed by a single trained investigator who was blinded to questionnaire responses. Consistent pressure application and examination duration were utilized to optimize reliability and reproducibility of palpatory findings. No therapeutic intervention, osteopathic manipulative treatment, medication administration, or other clinical intervention was provided as part of the study. Participants also completed a standardized health questionnaire assessing demographic characteristics, medical history, lifestyle factors, and recent or recurrent visceral symptoms.; Other Names: Chapman Reflex Point Assessment; Palpatory Examination of Chapman Reflex Points

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Prevalence of Chapman Reflex Points	The prevalence and distribution of Chapman Reflex Points identified during a standardized palpatory examination of established Chapman Reflex Point locations performed by a blinded trained investigator. The total number of Chapman Reflex Points observed per participant was recorded and summarized using descriptive statistics.	through study completion, an average of 1 year

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Association Between Chapman Reflex Points and Visceral Symptom Clusters	Associations between organ system-specific Chapman Reflex Point counts and self-reported visceral symptom clusters were evaluated using stepwise regression analyses and bivariate linear regression models.	through study completion, an average of 1 year
Sex Differences in Chapman Reflex Point Prevalence	Differences in the total number of Chapman Reflex Points identified among male and female participants were assessed using Welch's two-sample t-test.	through study completion, an average of 1 year

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Distribution of Organ System-Specific Chapman Reflex Points	The frequency of Chapman Reflex Points corresponding to individual organ systems, including pulmonary and lower gastrointestinal groupings, was assessed descriptively.	through study completion, an average of 1 year

Collaborators and Investigators

• Sponsor: The Touro College and University System

Study record dates

Study Major Dates

• Study Start (Actual): March 4, 2020
• Primary Completion (Actual): June 26, 2026
• Study Completion (Actual): June 27, 2026

Study Registration Dates

• First Submitted: June 30, 2026
• First Submitted That Met QC Criteria: July 6, 2026
• First Posted (Actual): July 8, 2026

Study Record Updates

• Last Update Posted (Actual): July 8, 2026
• Last Update Submitted That Met QC Criteria: July 6, 2026
• Last Verified: June 1, 2026

More Information

Terms related to this study

• Keywords: Autonomic Nervous System; Fascia; Sympathetic Nervous System; Osteopathic Medicine; Preventive Medicine; Lymphatic System; Osteopathic Manipulative Medicine; Connective Tissue; Myofibroblasts; Somatic Dysfunction; Chapman Reflex Points; Chapman Reflexes; Viscerosomatic Reflexes; Fascial Tissue; Lymphatic Physiology; Neuroendocrine Regulation; Mechanotransduction; Palpatory Examination; Visceral Symptoms
• Additional Relevant MeSH Terms: Nervous System Diseases; Hemic and Lymphatic Diseases; Autonomic Nervous System Diseases; Lymphatic Diseases
• Other Study ID Numbers: HSIRB_2019

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No