Muscle Weakness
Conditions
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.
Interventions
PROCEDUREHigh velocity low amplitude thoracic spine manipulation
Participants were supine on a treatment table. The chiropractor determined levels of apparent spinal dysfunction by means of static palpation. Participants were then asked to curl forward and bring their knees to their chest as the chiropractor placed a fist just inferior to the targeted level, anywhere between the T4 - T10 vertebrae. The participant was instructed to inhale and then exhale, at which point the chiropractor lowered the participant's torso back to the table and delivered a thrust using his body into his fist.
PROCEDURESham
A previously validated physiologically inert manual procedure to the thoracic spine
Sponsors
Raymond Chiropractic
University of New England
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Subject)
Masking description
Participants were unaware of the existence of a control group.
Eligibility
Sex/Gender
ALL
Age
18 Years to 65 Years
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Hip adductor force (weak limb) | 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. |
| Hip adductor muscle activity (weak limb) | Pre intervention, immediatly post intervention | Mean muscle activity during isometric contraction. Measured with surface electrode and reported as a percentage of maximum activation. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Hip extension force (weak limb) | Pre intervention, immediatly post intervention, 48 hours post intervention | Isometric force produced by the hip extensors in the weak limb. Measured with a force transducer and reported in Newtons. |
| Gluteus maximus muscle activity (weak limb) | Pre intervention, immediatly post intervention | Mean muscle activity during isometric contraction. Measured with surface electrode and reported as a percentage of maximum activation. |
| Shoulder extension force (weak limb) | Pre intervention, immediatly post intervention, 48 hours post intervention | Isometric force produced by the shoulder extensors in the weak limb. Measured with a force transducer and reported in Newtons. |
| Latissimus dorsi muscle activity (weak limb) | Pre intervention, immediatly post intervention | Mean muscle activity during isometric contraction. Measured with surface electrode and reported as a percentage of maximum activation. |
| Hip extension force (strong limb) | Pre intervention, immediatly post intervention, 48 hours post intervention | Isometric force produced by the hip extensors in the strong limb. Measured with a force transducer and reported in Newtons. |
| Latissimus dorsi muscle activity (strong limb) | 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 muscle activity (strong limb) | Pre intervention, immediatly post intervention | Mean muscle activity during isometric contraction. Measured with a force transducer and reported in Newtons. |
| Hip adductor force (strong limb) | Pre intervention, immediatly post intervention, 48 hours post intervention | Isometric force produced by the hip adductors in the strong limb. Measured with a force transducer and reported in Newtons. |
| Shoulder extension force (strong limb) | Pre intervention, immediatly post intervention, 48 hours post intervention | Isometric force produced by the shoulder extensors in the strong limb. Measured with a force transducer and reported in Newtons. |
| Gluteus maximus muscle activity (strong limb) | Pre intervention, immediatly post intervention | Mean muscle activity during isometric contraction. Measured with surface electrode and reported as a percentage of maximum activation. |
Countries
United States
Outcome results
None listed