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Effects of Adding End-Range Isometric Holds to Isotonic Knee Extensor Training on Isokinetic Performance in Sedentary Adults: A Randomized Controlled Trial
Sponsor: Yeditepe University
Summary
The goal of this clinical trial is to learn if adding a short muscle hold (isometric contraction) to a standard leg-strengthening exercise improves knee muscle strength more than the standard exercise alone, in healthy adults who do not exercise regularly. The main question it aims to answer is: Does adding a 5-second hold at the end of each leg-extension exercise lead to greater gains in front-thigh muscle (quadriceps) strength than leg-extension exercise alone? Researchers will compare two exercise groups to see if the added muscle hold makes a difference: Group 1 will do leg-extension exercises with a 5-second hold added at the end of each repetition. Group 2 will do the same leg-extension exercises without the added hold. Participants will: Do leg-extension exercises 3 days a week for 8 weeks Have their thigh muscle strength tested before and after the program using a special exercise machine Have their thigh size measured before and after the program
Key Details
Gender
All
Age Range
18 Years - 40 Years
Study Type
INTERVENTIONAL
Enrollment
43
Start Date
2014-12-12
Completion Date
2015-07-06
Last Updated
2026-06-25
Healthy Volunteers
Yes
Conditions
Interventions
Isotonic Exercise With Added Isometric Hold
Isotonic knee-extension exercise (2 sets of 10 repetitions at 60% of 1-repetition maximum) performed 3 days per week for 8 weeks, with weekly load progression (\~5%) and 60 seconds of rest between sets. Each repetition concluded with a 5-second isometric hold of the lifted weight at 0° knee extension.
Isotonic Exercise Only
Isotonic knee-extension exercise (2 sets of 10 repetitions at 60% of 1-repetition maximum) performed 3 days per week for 8 weeks, with weekly load progression (\~5%) and 60 seconds of rest between sets, without an added isometric hold.
Locations (1)
Sportomed | Physical Therapy and Rehabilitation Center
Istanbul, Bostancı/Kadıköy, Turkey (Türkiye)