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Quadriceps and Hamstring Activation Timing
Sponsor: KTO Karatay University
Summary
The anterior cruciate ligament (ACL) plays a crucial role in maintaining knee stability and enabling dynamic movement. ACL injuries are common, especially among athletes, and reconstruction surgery is frequently performed to restore knee function. Despite rehabilitation, neuromuscular deficits-particularly in muscle activation timing-may persist. This study will aim to evaluate the activation timing of quadriceps and hamstring muscles during a functional task in individuals who have undergone ACL reconstruction.
Official title: Quadriceps and Hamstring Activation Timing During Functional Tasks Following ACL Reconstruction
Key Details
Gender
MALE
Age Range
18 Years - 45 Years
Study Type
OBSERVATIONAL
Enrollment
30
Start Date
2026-04-20
Completion Date
2026-06-15
Last Updated
2026-07-14
Healthy Volunteers
No
Interventions
Electromyography
Electromyographic (EMG) data will be collected using the Noraxon Ultium EMG sensor system (Noraxon USA, Inc., Scottsdale, Arizona; sampling frequency: 4000 Hz per channel; gain: 1000 \[signal-to-noise ratio: 1 μV RMS\]; common mode rejection rate \[CMRR\]: -100 dB; input impedance: \>100 MΩ). Prior to electrode placement, any hair on the skin will be removed, and the skin will be cleansed with an alcohol swab to ensure optimal signal quality. Participants will be instructed to cross their arms over their chest and perform the squat slowly and in a controlled manner while maintaining balance. The knee flexion angle will be standardized at 60°, and this angle will be monitored and adjusted using an inclinometer integrated into the EMG system. A metronome will be used to control the squatting speed. Participants will be instructed to reach the squat position within 3 beats of the metronome, maintain the squat position for 3 beats, and return to the starting position within 3 beats.
Locations (1)
Kto Karatay University
Konya, Karatay, Turkey (Türkiye)