Effects of a High Velocity Low Amplitude Mid-Thoracic Spinal Segment Manipulation on the Force Output of the Hip Adductors and Extensors and the Latissimus Dorsi in Healthy Individuals With Unilateral Hip Adductor Weakness
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Sponsor
- University of New England
- Enrollment
- 40
- Locations
- 1
- Primary Endpoint
- Hip adductor muscle activity (weak limb)
Study Overview
Brief Summary
The goal of this trial was to determine if a mid-thoracic high velocity low amplitude spinal manipulation improves force output in those with unilateral hip adductor weakness. The main aims were to determine if the intervention:
Improved hip adductor force and muscle activation immediately and 48 h post manipulation compared to a control group.
Improved gluteus maximus and latissimus dorsi force and muscle activation immediately and 48 h post manipulation compared to a control group.
Strength and muscle activation of the hip adductors, hip extensors (gluteus maximus), and shoulder extensors (latissimus dorsi) were measured prior to, immediate after, and 48 hours after receiving a high velocity low amplitude manipulation to the thoracic spine. The manipulation was performed by a licensed chiropractor.
A control group received a validated sham manipulation to the thoracic spine. Participants were blinded to group assignment.
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Parallel
- Primary Purpose
- Treatment
- Masking
- Single (Participant)
Masking Description
Participants were unaware of the existence of a control group.
Eligibility Criteria
- Ages
- 18 Years to 65 Years (Adult, Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •Unilateral hip adductor weakness, as assessed by manual muscle testing
- •Pain free hip motion
- •No contraindications to high velocity thoracic spine manipulation including:
- •Any known active cancer/ Metastatic Bone Cancer Osteoporosis or other metabolic bone disorders Signs of spinal cord compression Nerve root compression with increasing neurologic deficit Signs of Vertebrobasilar insufficiency/ cervical artery abnormalities Bleeding Diatheses Angina pectoris
Exclusion Criteria
- •Current pain in the adductor muscle group
- •Past history of hip surgery
- •Past history of hip fracture
- •History of spine or rib fractures
- •Psoas muscle group (hip flexor) weakness as determined by manual muscle testing
- •Received a chiropractic manipulation in past week
Arms & Interventions
Manipulation
Those in the intervention group received a high velocity low amplitude manipulation to the mid-thoracic spine provided by a licensed chiropractor.
Intervention: High velocity low amplitude thoracic spine manipulation (Procedure)
Sham
Those in the control group received a validated sham manipulation to the mid-thoracic spine. The sham manipulation was done so that there was minimal downward force applied to the spine.
Intervention: Sham (Procedure)
Outcomes
Primary Outcomes
Hip adductor muscle activity (weak limb)
Time Frame: Pre intervention, immediatly post intervention
Mean muscle activity during isometric contraction. Measured with surface electrode and reported as a percentage of maximum activation.
Hip adductor force (weak limb)
Time Frame: Pre intervention, immediatly post intervention, 48 hours post intervention
Isometric force produced by the hip adductors in the weaker limb. Measured with a force transducer and reported in Newtons.
Secondary Outcomes
- Gluteus maximus muscle activity (strong limb)(Pre intervention, immediatly post intervention)
- Hip extension force (strong limb)(Pre intervention, immediatly post intervention, 48 hours post intervention)
- Hip extension force (weak limb)(Pre intervention, immediatly post intervention, 48 hours post intervention)
- Shoulder extension force (weak limb)(Pre intervention, immediatly post intervention, 48 hours post intervention)
- Latissimus dorsi muscle activity (weak limb)(Pre intervention, immediatly post intervention)
- Latissimus dorsi muscle activity (strong limb)(Pre intervention, immediatly post intervention)
- Shoulder extension force (strong limb)(Pre intervention, immediatly post intervention, 48 hours post intervention)
- Hip adductor muscle activity (strong limb)(Pre intervention, immediatly post intervention)
- Gluteus maximus muscle activity (weak limb)(Pre intervention, immediatly post intervention)
- Hip adductor force (strong limb)(Pre intervention, immediatly post intervention, 48 hours post intervention)
Investigators
Michael Lawrence
Associate Teaching Professor
University of New England