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Most Effective Knee Joint Angle Pair for Isometric Exercise
Sponsor: Firat University
Summary
This study investigated the effects of isometric exercises applied to the quadriceps and hamstring muscles at different knee joint angles on balance, joint position sense, and functional performance in healthy individuals. Thirty participants aged 18-26 years were randomized into four groups and performed an eight-week training program, three times per week. Outcome measures included the Y Balance Test, digital goniometer assessments for joint position sense, and functional performance tests (stair climb and 30-second sit-to-stand). The results aim to identify which knee joint angles are most effective for improving neuromuscular function and may guide future rehabilitation and training protocols.
Official title: The Effect of Isometric Exercises Applied to the Quadriceps and Hamstring Muscles at Different Knee Angles on Balance, Joint Position Sense, and Functional Performance in Healthy Individuals
Key Details
Gender
All
Age Range
18 Years - 30 Years
Study Type
INTERVENTIONAL
Enrollment
44
Start Date
2025-01-15
Completion Date
2025-05-30
Last Updated
2026-05-28
Healthy Volunteers
Yes
Conditions
Interventions
Isometric Exercise at 15° and 90° Knee Angles
Participants performed quadriceps and hamstring isometric contractions at 15° and 90° of knee flexion. Each contraction lasted 10 seconds against resistance, three times per week for eight weeks, with progressive repetitions. Hip and ankle strengthening was also included.
Isometric Exercise at 30° and 105° Knee Angles
Same protocol as Group 1, but at 30° and 105° of knee flexion.
Isometric Exercise at 45° and 120° Knee Angles
Same protocol as Group 1, but at 45° and 120° of knee flexion.
Isometric Exercise at 60° and 135° Knee Angles
Same protocol as Group 1, but at 60° and 135° of knee flexion.
Locations (1)
Fırat Üniversitesi
Elâzığ, Merkez, Turkey (Türkiye)