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Quadriceps and Hamstring Activation Timing

NCT07532980 · Status: ENROLLING_BY_INVITATION · Type: OBSERVATIONAL · Enrollment: 25

Last updated 2026-04-16

No results posted yet for this study

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.

Conditions

  • Anterior Cruciate Ligament Reconstruction
  • Knee Injury
  • Neuromuscular Control

Interventions

DIAGNOSTIC_TEST

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.

Sponsors & Collaborators

  • KTO Karatay University

    lead OTHER

Eligibility

Min Age
18 Years
Max Age
45 Years
Sex
MALE
Healthy Volunteers
No

Timeline & Regulatory

Start
2026-04-20
Primary Completion
2026-05-02
Completion
2026-05-15

Countries

  • Turkey (Türkiye)

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07532980 on ClinicalTrials.gov