“Data reviewed in this article lend strong support to the popular contention that chiropractic adjustments, for the purpose of correcting subluxations, confer health benefits to people regardless of the presence or absence of symptoms…”

“Improved function can be measured in “normal” presenting individuals following chiropractic care. Objective physiologic changes and their associated health benefits can be easily measured in a number of body systems, often by relatively non-invasive means…”

“This review collectively documents statistically significant improvements in respiration, range of motion, heart rate variability and autonomic function, endocrine function, cardiovascular function, immune function, muscle strength and overall athletic ability of “healthy” or specific-function “normal” individuals”.

“Other studies have documented statistically significant increases or improvements in neurocognitive functions such as reaction-time and information processing, visual acuity, stress and reproductive hormones, healing / recovery time, general health of senior citizens, and reduced labour times of pregnant women following or during chiropractic care”.

“Considering that these initial findings document objectively measured physiologic changes and their associated health benefits in nearly every major system of the human body, it is plausible that chiropractic care may benefit every function of the body. Furthermore, these data are congruent with numerous subjective studies that suggest chiropractic care is associated with accruing, long-term, overall health benefits. The author of this review agrees that while it is the opinion of an overwhelming majority of practicing doctors of chiropractic that regular chiropractic care is of benefit to all people of all ages, more research is necessary to further document the efficacy of subluxation correction”.

Objective Physiologic Changes and Associated Health Benefits of Chiropractic Adjustments in Asymptomatic Subjects: A Review of the Literature

Sean M. Hannon, BA, DC


Objective: To review existing literature documenting objectively measured physiologic changes and their associated health benefits subsequent to chiropractic adjustments, primarily in asymptomatic individuals.

Data Collection: “Asymptomatic” “normal” “pain-free” and “healthy” subjects were keywords used to search for articles pertaining to the objective. Data was collected directly from the bound journals of the Palmer College of Chiropractic library in Davenport, IA, Life University library in Marietta, GA, and the Sherman College of Chiropractic library in Spartanburg, SC. Some articles were downloaded from peer-reviewed journals accessible through campus Internet subscription.

Results: More than twenty studies were found documenting objective health benefits in subjects who were specifically described as “asymptomatic,” “healthy,” “normal,” or “free from physical injury.” Nearly an equal number of studies were found documenting objectively measured health benefits in subjects to which no symptomatic presentation was described.

Conclusion: The data reviewed lend support to the contention that chiropractic adjustments, often for the purpose of correcting vertebral subluxation, confer measurable health benefits to people regardless of the presence or absence of symptoms. A significant amount of preliminary evidence supports that people without symptoms can benefit from chiropractic care. Improved  function can be objectively measured in asymptomatic individuals following chiropractic care in a number of body systems often by relatively non-invasive means. It is plausible that chiropractic care may be of benefit to every function of the body and have the potential for long-term, overall health benefit to those receiving chiropractic care.

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