The Role of Sural Nerve Reflex During Jump Landing in Subjects with and without Chronic Ankle Instability

Study Overview

Previous research has found that people who sustain an ankle sprain are much more likely to injure their ankle again in the future. Our goal with this present study is to further investigate how nerves around the ankle help the muscles in the lower leg prepare for jump landings, and whether people with a history of ankle sprains have signs of altered nerve function.

Study Description

Participants will participate in a single data collection session in the school of public health for approximately 2 hours.  During the data collection session, participants complete 2 questionnaires, and researchers will measure height and weight as well as determine dominant limb. Researchers will then place 9 non-invasive electrodes below the knee and an electric goniometer around the ankle of the leg to be tested.
Participants will then complete a warm-up 5-minute treadmill walk and stretch. Researchers will place a stimulating electrode above the ankle and slowly raise intensity until participants feel a "pins and needles" sensation. Participants will then complete drop landing trials, standing on a raised platform (approximately 1 1/2 feet tall) on one leg with hands on hips and then dropping to the floor landing on the test leg.  Nerve stimulations will occur randomly throughout the drop landing trials. 
Participants will perform approximately 60 drop landings, which accounts for 10 practice trials (3 trials without error needed), 20 unstimulated trials, 15 stimulated trials, and a total of 15 failed trials (if necessary).  

  • IRB Number: 2001968860
  • Research Study Identifier: 2001968860
  • Principal Investigator: Leif Madsen

Recruitment Status


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