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The goal of this clinical trial is to learn if chiropractic ankle manipulation can improve squat jump performance. It will also learn about the relationship among chiropractic ankle manipulation, ankle range of motion, and squat jump performance. The main questions it aims to answer are:
Researchers will compare squat jump performance between subjects who receive chiropractic ankle manipulations with control subjects to see if ankle chiropractic manipulation works to improve squat jump performance.
Participants will:
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Chiropractic Ankle Manipulation | Experimental | LEM - Lower Extremity Manipulation: Subjects assigned to the LEM Intervention Group will receive a short lever, high velocity, low-amplitude distractive (caudal) thrust directed at the talocrural joint. The treating chiropractor will deliver the LEM to the right ankle then the left ankle. LEM is an adjustment for long axis distraction of the tibiotalar joint with the goal to improve dorsiflexion of the ankle joint. |
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| Control | No Intervention | Subjects assigned to the Control Group will rest quietly, supine (face up), on the chiropractic treatment table for five (5) minutes. |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Manual Therapy Procedure: Chiropractic Ankle Manipulation | Other | The lower extremity manipulation (LEM) procedure is a short lever, high velocity, low-amplitude distractive (caudal) thrust directed at the talocrural joint. The treating chiropractor will deliver the LEM to the right ankle then the left ankle. LEM is an adjustment for long axis distraction of the tibiotalar joint with the goal to improve dorsiflexion of the ankle joint. |
| Measure | Description | Time Frame |
|---|---|---|
| Squat Jump Height | Subjects will be instructed to jump upwards from the starting squat position as high as possible. Subjects will perform 3 to 6 jumps with 3 consecutive jump heights being within 5% of each other to ensure maximum jump height is achieved. There will be a one-minute rest between jumps.
The Optojump photoelectric cell system (OptoJump) will be used to record jump height. OptoJump demonstrates strong concurrent validity and excellent test-retest reliability for the estimation of vertical jump height | Baseline on Day 1 to Immediately after Intervention on Day 1 |
| Range of Motion of Ankle Dorsiflexion | Knee-to-wall ankle dorsiflexion test:
| Baseline on Day 1 to Immediately after Treatment on Day 1 and at End of Test Session on Day 1 |
| Measure | Description | Time Frame |
|---|---|---|
| Leg Muscle Power (W/Kg) | Squat Jump Muscle Parameter: The Optojump will calculate an estimate of leg muscle power (W/Kg). The reliability and concurrent validity of OptoJump to measure jump height suggests that the evidence-base biomechanical formula to calculate the estimate of leg muscle power by OptoJump is reliable with face validity. | Baseline on Day 1 to Immediately after Intervention on Day 1 |
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Inclusion Criteria
Exclusion Criteria
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Jeanmarie R Burke, PhD | Contact | 315 568-3869 | jburke@northeastcollege.edu |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Biomechanics Laboratory at Northeast College of Health Sciences | Recruiting | Seneca Falls | New York | 13148 | United States |
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| Contraction Velocity of Leg Muscles (mm/s), Force-Velocity Curve | Squat Jump Muscle Parameter: The Gyko inertial sensor system (Gyko) will measure the velocity of the jump to calculate an estimate of the contraction velocity of leg muscles, force-velocity curve. The reliability and concurrent validity of Gyko to measure jump height and in-turn estimate muscle function parameters is limited in the literature. The control group in the current study will allow us to address concurrent validity and reliability of Gyko to measure jump height. Jump height measured by Optojump is the gold-standard field base device. Comparison of Gyko to Optojump measurements of jump heights will determine concurrent validity of Gyko to estimate jump height. The use of evidence-base biomechanical formulas to calculate an estimate of contraction velocity of leg muscles during SQJ's depends on recording reliable and valid measurements of jump heights; and in turn, establish the reliability and face validity of Gyko to estimate muscle function parameters. | Baseline on Day 1 to Immediately after Intervention on Day 1 |
| Rate of Force Development of Leg Muscles (N/s), Slope of the Force - Velocity Curve | Squat Jump Muscle Parameter: The Gyko inertial sensor system (Gyko) will measure the velocity of the jump to calculate an estimate of the rate of force development of leg muscles, slope of the force - velocity curve The reliability and concurrent validity of Gyko to measure jump height and in-turn estimate muscle function parameters is limited in the literature. The control group in the current study will allow us to address concurrent validity and reliability of Gyko to measure jump height. Jump height measured by Optojump is the gold-standard field base device. Comparison of Gyko to Optojump measurements of jump heights will determine concurrent validity of Gyko to estimate jump height. The use of evidence-base biomechanical formulas to calculate an estimate of the rate of force development of leg muscles during SQJ's depends on recording reliable and valid measurements of jump heights; and in turn, establish the reliability and face validity of Gyko to estimate muscle function. | Baseline on Day 1 to Immediately after Intervention on Day 1 |