Effects of a Thoracic Manipulation on Hip Adductor, Extensor, and Latissimus Dorsi Force in Those With Adductor Weakness
NCT Number: NCT06534931
Status: COMPLETED
Study Type: INTERVENTIONAL
Phases: NA
Conditions: Muscle Weakness
Interventions: PROCEDURE: High velocity low amplitude thoracic spine manipulation|PROCEDURE: Sham
Sponsor: University of New England
Collaborators: Raymond Chiropractic
Sex: ALL
Age: ADULT, OLDER_ADULT
Enrollment: 40
Study Design: Allocation: RANDOMIZED|Intervention Model: PARALLEL|Masking: SINGLE (PARTICIPANT)|Primary Purpose: TREATMENT
Start Date: 2021-11-08
Completion Date: 2023-12-13
Locations: University of New England, Portland, Maine, 04103, United States

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.

Primary Outcome Measures: Hip adductor force (weak limb), Isometric force produced by the hip adductors in the weaker limb. Measured with a force transducer and reported in Newtons., Pre intervention, immediatly post intervention, 48 hours post intervention|Hip adductor muscle activity (weak limb), Mean muscle activity during isometric contraction. Measured with surface electrode and reported as a percentage of maximum activation., Pre intervention, immediatly post intervention
Secondary Outcome Measures: Hip extension force (strong limb), Isometric force produced by the hip extensors in the strong limb. Measured with a force transducer and reported in Newtons., Pre intervention, immediatly post intervention, 48 hours post intervention|Gluteus maximus muscle activity (strong limb), Mean muscle activity during isometric contraction. Measured with surface electrode and reported as a percentage of maximum activation., Pre intervention, immediatly post intervention|Hip extension force (weak limb), Isometric force produced by the hip extensors in the weak limb. Measured with a force transducer and reported in Newtons., Pre intervention, immediatly post intervention, 48 hours post intervention|Gluteus maximus muscle activity (weak limb), Mean muscle activity during isometric contraction. Measured with surface electrode and reported as a percentage of maximum activation., Pre intervention, immediatly post intervention|Shoulder extension force (weak limb), Isometric force produced by the shoulder extensors in the weak limb. Measured with a force transducer and reported in Newtons., Pre intervention, immediatly post intervention, 48 hours post intervention|Latissimus dorsi muscle activity (weak limb), Mean muscle activity during isometric contraction. Measured with surface electrode and reported as a percentage of maximum activation., Pre intervention, immediatly post intervention|Shoulder extension force (strong limb), Isometric force produced by the shoulder extensors in the strong limb. Measured with a force transducer and reported in Newtons., Pre intervention, immediatly post intervention, 48 hours post intervention|Latissimus dorsi muscle activity (strong limb), Mean muscle activity during isometric contraction. Measured with surface electrode and reported as a percentage of maximum activation., Pre intervention, immediatly post intervention|Hip adductor muscle activity (strong limb), Mean muscle activity during isometric contraction. Measured with a force transducer and reported in Newtons., Pre intervention, immediatly post intervention|Hip adductor force (strong limb), Isometric force produced by the hip adductors in the strong limb. Measured with a force transducer and reported in Newtons., Pre intervention, immediatly post intervention, 48 hours post intervention