Muscle Activation Characteristics During Spinal Manipulation in Healthy and Low Back Pain Participants

Study Overview
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Brief Summary
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To characterize muscle activity through electromyography (EMG) of the lumbar spine during high velocity, low amplitude (HVLA) spinal manipulation according to parameters of practitioner contact (location, applied force) in healthy participants and two categories of low back pain participants.

Official Title
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Muscle Activation Characteristics During Spinal Manipulation in Healthy and Low Back Pain Participants

Conditions
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Back Pain

Intervention / Treatment
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* Procedure: Spinal Manipulation


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: male and female participants ages 18 to 55 years old Exclusion Criteria: Active Worker's Compensation claim related to low back pain episode Active personal injury case related to low back pain episode Currently taking muscle relaxers, steroids, or narcotics Body mass index > 30 kg/m2 Active cancer process Active infection Pregnancy High risk of osteoporosis assessed using the World Health Organization Fracture Risk Assessment Tool (included in submission) Osteogenic conditions (see screening questionnaire) Premature menopause Latex Allergies Lumbar spine or pelvic surgery Past spinal trauma producing spinal fracture

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Healthy Participants<br>Spinal manipulation | Procedure: Spinal Manipulation<br>* HVLA (High Velocity Low Amplitude) spinal manipulation directed at the lumbar spine and sacroiliac (SI) joints<br>|
| Acute Low back pain participants<br>Spinal Manipulation | Procedure: Spinal Manipulation<br>* HVLA (High Velocity Low Amplitude) spinal manipulation directed at the lumbar spine and sacroiliac (SI) joints<br>|
| Chronic low back pain participants<br>Spinal Manipulation | Procedure: Spinal Manipulation<br>* HVLA (High Velocity Low Amplitude) spinal manipulation directed at the lumbar spine and sacroiliac (SI) joints<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Muscle Response | Muscle activity of the lumbar spinal musculature as measured by both surface and indwelling electromyography. Total response expressed as a percentage of muscles on. | During spinal manipulation at the time of testing | 
| Muscle Activity Onset Delay | Muscle activity of the lumbar spinal musculature as measured by both surface and indwelling electromyography. Time delay between the manipulation force and the muscle activity | During spinal manipulation at the time of testing | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Manipulation, Spinal, electromyography, kinetics, kinematic