ArticlePloS one2018
Test-retest reliability of knee extensor rate of velocity and power development in older adults using the isotonic mode on a Biodex System 3 dynamometer.
Article in PloS one, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers.
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Who cites it
18 citing papers in PubMed, 48 citations in OpenAlex.
- Evaluating the Test-Retest Reliability and Measurement Error of a Sit-Stand-Power Test in Individuals Treated for Cancer.Integrative cancer therapiesTrial
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- It's time to re-evaluate the reporting of common measures from isokinetic dynamometers: isokinetic for torque, isotonic for power.Frontiers in sports and active living · 2025Article
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- Biomechanical Examination of Wrist Flexors and Extensors with Biodex System Dynamometer-Isometric, Isokinetic and Isotonic Protocol Options.Medicina (Kaunas, Lithuania) · 2024Article
- A Comprehensive Examination of Age-Related Lower Limb Muscle Function Asymmetries across a Variety of Muscle Action Types.Geriatrics (Basel, Switzerland) · 2024Article
- Single-session measures of quadriceps neuromuscular function are reliable in healthy females and unaffected by age.European journal of applied physiology · 2024Article
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- Effects of active exergames on physical performance in older people: an overview of systematic reviews and meta-analysis.Frontiers in public health · 2024Article
- The influence of distribution, severity and volume of posttraumatic bone bruise on functional outcome after ACL reconstruction for isolated ACL injuries.Archives of orthopaedic and trauma surgery · 2023Article
- Reliability and Validity of a Portable Traction Dynamometer in Knee-Strength Extension Tests: An Isometric Strength Assessment in Recreationally Active Men.Healthcare (Basel, Switzerland) · 2023Article
- Isokinetic knee muscle strength comparison after enhanced recovery after surgery (ERAS) versus conventional setup in total knee arthroplasty (TKA): a single blinded prospective randomized study.Journal of experimental orthopaedics · 2023Article
- Brace-Free Rehabilitation after Isolated Anterior Cruciate Ligament Reconstruction with Hamstring Tendon Autograft Is Not Inferior to Brace-Based Rehabilitation-A Randomised Controlled Trial.Journal of clinical medicine · 2023Article
- Test-Retest Reliability of Isokinetic Strength Measurements in Lower Limbs in Elderly.Biology · 2022Article
- Article
- The Influence of Active Hamstring Stiffness on Markers of Isotonic Muscle Performance.Sports (Basel, Switzerland) · 2021Article
- Muscle Performance Changes with Age in Active Women.International journal of environmental research and public health · 2021Article
- Reliability of Lower Extremity Muscle Power and Functional Performance in Healthy, Older Women.Journal of aging research · 2021Article
Corrections and comments
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Isotonic testing and measures of rapid power production are emerging as functionally relevant test methods for detection of muscle aging. Our objective was to assess reliability of rapid velocity and power measures in older adults using the isotonic mode of an isokinetic dynamometer. Sixty-three participants (aged 65 to 82 years) underwent a test-retest protocol with one week time interval. Isotonic knee extension tests were performed at four different loads: 0%, 25%, 50% and 75% of maximal isometric strength. Peak velocity (pV) and power (pP) were determined as the highest values of the velocity and power curve. Rate of velocity (RVD) and power development (RPD) were calculated as the linear slopes of the velocity- and power-time curve. Relative and absolute measures of test-retest reliability were analyzed using intraclass correlation coefficients (ICC), standard error of measurement (SEM) and Bland-Altman analyses. Overall, reliability was high for pV, pP, RVD and RPD at 0%, 25% and 50% load (ICC: .85 - .98, SEM: 3% - 10%). A trend for increased reliability at lower loads seemed apparent. The tests at 75% load led to range of motion failure and should be avoided. In addition, results demonstrated that caution is advised when interpreting early phase results (first 50ms). To conclude, our results support the use of the isotonic mode of an isokinetic dynamometer for testing rapid power and velocity characteristics in older adults, which is of high clinical relevance given that these muscle characteristics are emerging as the primary outcomes for preventive and rehabilitative interventions in aging research.
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