Does Passive Spinal Mobilization Improve Shoulders Strength in Healthy Adults?

Study Overview
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Brief Summary
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Previous studies have shown that peripheral muscles weakness or inhibition is related to spinal disorders. Passive mobilization and manipulation are likely to reverse such muscle weakness for patients with spinal pain. The purpose of the study was to assess the effect of spinal mobilization on the maximal muscle strength of the shoulders.

Detailed Description
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Participants without existing neck pain or shoulder problem will be recruited. Subjects will be screened by 2 investigators independently for shoulder muscle weakness. Weakness is determined by the strength of the other side when one side is remarkably weaker or by comparing with the general strength of the deltoid muscle if both sides are suspected involved. Suitable participants will undergo shoulder strength testing with a handheld dynamometer. Participants will be divided into the intervention group and the control group randomly. The shoulder strength will be tested by the second, individual blinded assessor. Subjects in the intervention group will receive passive spinal mobilization at cervical 4-5 segment on the involved side(s); the control group will receive placebo intervention. Each participant will be tested for 2 times, before and immediately after a C4-5 joint mobilization on the involved side (s).

Official Title
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Does Passive Spinal Mobilization Improve Shoulders Strength in Healthy Adults?

Conditions
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Healthy

Intervention / Treatment
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* Behavioral: Passive mobilization
* Other: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy adults Exclusion Criteria: People with active neck or should pain

Ages Eligible for Study
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Minimum Age: 18 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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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Experimental group<br>Passive mobilization on cervical spine | Behavioral: Passive mobilization<br>* An anterior-posterior manual pressure act on the cervical spine of the subject<br>|
| Placebo Comparator: Control<br>Placebo exercise on arms | Other: Placebo<br>* The elbows will be put into a 90 deg elevated position and held for 5 secs, then back to resting position<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Deltoid muscle strength (dynamometer) | Immediate measure after the intervention by dynamometer | 10 minutes after the intervention | 
| Electromyography (EMG) (signal from deltoid muscle) | The EMG measure on the signal from deltoid muscle immediately after intervention | 10 minutes after the intervention | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Spine, mobilization