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Isokinetic Knee Strength, Bilateral Muscle Balance, and Anaerobic Performance in Adolescent Athletes (ISOK-WAnT)

2 november 2026 bijgewerkt door: Assoc. Prof. Dr. Özgür EKEN, Inonu University

Relationship of Isokinetic Knee Strength and Bilateral Muscle Balance With Anaerobic Performance in Adolescent Athletes

This study looks at how strong the knee muscles are in adolescent athletes and how this strength relates to short-term, high-intensity (anaerobic) performance. Strong, well-balanced thigh muscles may help athletes produce more power during sport movements, but this has not been studied well in teenagers. Male athletes aged 15-16 years will be measured on two separate days. On the first day, their height and body weight will be measured and the strength of the muscles at the front (quadriceps) and back (hamstrings) of both thighs will be tested on a special strength-testing machine. On the second day, they will do a 30-second all-out cycling test to measure anaerobic power. The study will compare the right and left legs and will examine whether knee muscle strength and the balance between the front and back thigh muscles are linked to power output during the cycling test. No treatment or intervention will be given. The results may help coaches and sports scientists understand the physical development of adolescent athletes.

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

Lower-limb strength and anaerobic power are important parts of the physical profile of adolescent athletes in high-intensity sports such as wrestling. Isokinetic dynamometry allows knee extensor (quadriceps) and flexor (hamstring) strength and the balance between these muscle groups to be measured objectively, while the 30-second Wingate Anaerobic Test (WAnT) is a widely used laboratory test of anaerobic performance. Evidence on how these measures relate to each other in adolescent athletes is limited.

This is a cross-sectional, correlational observational study. Twenty-one male adolescent athletes aged 15-16 years will be recruited in Malatya, Turkey. Written informed consent will be obtained from parents or legal guardians, and assent from participants. Testing will take place on two separate days to limit fatigue. Participants will avoid heavy exercise for 48 hours and caffeine for 12 hours before testing.

Day 1: Height and body mass are measured and body mass index is calculated. Concentric knee extension and flexion are then tested bilaterally on a HUMAC NORM isokinetic dynamometer at 60, 120 and 180 degrees per second (three practice repetitions followed by five maximal repetitions at each speed; 45 seconds of rest between speeds and 10 minutes between limbs). Peak torque is recorded for the quadriceps and hamstrings of each limb, and the conventional hamstring-to-quadriceps (H/Q) ratio is calculated.

Day 2: Participants complete a 30-second WAnT on a mechanically braked cycle ergometer (Monark 874E) with a braking load of 0.075 kg per kg of body mass, after a standardized warm-up. Peak power, mean power and fatigue index are recorded.

Differences between the right and left limbs will be examined with paired-samples t-tests (with 95% confidence intervals and Cohen's dz). Associations between isokinetic variables and WAnT outcomes will be examined with Pearson correlation. The sample size (minimum 19) was calculated with G*Power for a correlation of r = 0.60 (alpha = 0.05, power = 0.80); 21 participants are planned to allow for possible data loss.

Studietype

Observationeel

Inschrijving (Geschat)

21

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Studie Contact Back-up

Studie Locaties

  • Turkije (Türkiye)
    • Malatya
      • Malatya, Malatya, Turkije (Türkiye), 44280
        • Department of Physical Education and Sport Teaching, Faculty of Sports Sciences, Inonu University,
        • Contact:
        • Contact:
        • Hoofdonderzoeker:
          • Özgür Eken, PhD, Assoc. Prof
        • Onderonderzoeker:
          • Denizhan Caliskan, Dr.

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

15 jaar tot 16 jaar (Kind)

Accepteert gezonde vrijwilligers

Ja

Geslachten die in aanmerking komen voor studie

Mannelijk

Bemonsteringsmethode

Niet-waarschijnlijkheidssteekproef

Studie Bevolking

Male adolescent athletes aged 15-16 years who actively wrestle and train regularly in Malatya, Turkey. Participants are healthy athletes recruited from local clubs on a voluntary basis.

Beschrijving

Inclusion Criteria:

  • Actively practicing wrestling in Malatya, Turkey
  • Male, aged 15-16 years
  • At least 2 years of regular training (at least 2 days per week)
  • No lower-extremity injury or surgery in the last 6 months
  • No musculoskeletal, cardiometabolic, or neurological condition that could prevent testing
  • Willing to participate in all planned tests
  • Written informed consent signed by parent or legal guardian, and assent from the participant

Exclusion Criteria: * Younger than 15 or older than 16 years

  • Lower-extremity injury or surgery within the last 6 months
  • Musculoskeletal, cardiometabolic, or neurological condition that could prevent testing
  • Open wound, varicose veins, acute inflammation, or history of thrombosis
  • Regular use of analgesic or anti-inflammatory medication or ergogenic supplements in the last 3 months
  • Unable to attend all planned testing sessions
  • Unwilling to follow the pre-test rules (no heavy exercise for 48 hours, no caffeine for 12 hours, usual training and diet)
  • Withdrawal during the study due to non-compliance, incomplete sessions, serious injury or illness, or participant request

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Observatiemodellen: COHORT
  • Tijdsperspectieven: CROSS_SECTIONAL

Cohorten en interventies

Groep / Cohort
Interventie / Behandeling
Adolescent Athletes

Male adolescent athletes aged 15-16 years who regularly train and compete. All participants complete anthropometric measurements, bilateral isokinetic knee strength testing, and the Wingate Anaerobic Test on separate days.
Diagnostische toets: Isokinetic Knee Strength Testing

Bilateral concentric knee extension and flexion tested on an isokinetic dynamometer at 60, 120, and 180 degrees per second. Peak torque and the conventional hamstring-to-quadriceps ratio are recorded.

Diagnostische toets: Wingate Anaerobic Test

A 30-second all-out cycling test on a mechanically braked cycle ergometer with a braking load of 0.075 kg per kg of body mass. Peak power, mean power, and fatigue index are recorded.

Andere namen:
  • WAnT

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Isokinetic Peak Torque of the Knee Extensors and Flexors
Tijdsspanne: Day 1 of testing (single measurement session)

Peak torque (N·m) of the quadriceps and hamstrings, measured separately for the right and left limbs at 60, 120, and 180 degrees per second on an isokinetic dynamometer (highest value across five maximal concentric repetitions). Right-to-left differences and associations with Wingate Anaerobic Test outcomes are analyzed.
Day 1 of testing (single measurement session)
Wingate Anaerobic Test Peak Power
Tijdsspanne: Day 2 of testing (single measurement session)

Highest power output (W) achieved during the 30-second Wingate Anaerobic Test performed on a mechanically braked cycle ergometer with a braking load of 0.075 kg per kg of body mass.
Day 2 of testing (single measurement session)

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Conventional Hamstring-to-Quadriceps (H/Q) Strength Ratio
Tijdsspanne: Day 1 of testing

Concentric hamstring peak torque divided by quadriceps peak torque, multiplied by 100 (%), calculated for each limb at 60, 120, and 180 degrees per second.
Day 1 of testing
Wingate Anaerobic Test Mean Power
Tijdsspanne: Day 2 of testing

Average power output (W) maintained across the 30-second Wingate Anaerobic Test.
Day 2 of testing
Wingate Anaerobic Test Fatigue Index
Tijdsspanne: Day 2 of testing

Percentage decline from peak power to the lowest power output during the test: [(peak power - minimum power) / peak power] × 100.
Day 2 of testing

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Inonu University

Onderzoekers

  • Hoofdonderzoeker: Özgür Eken, PhD, Assoc. Prof., Inonu University, Faculty of Sport Sciences
  • Studie directeur: Denizhan Çalışkan, Dr., Eskisehir Provincial Directorate of Youth and Sports, Eskisehir, Türkiye

Publicaties en nuttige links

De persoon die verantwoordelijk is voor het invoeren van informatie over het onderzoek stelt deze publicaties vrijwillig ter beschikking. Dit kan gaan over alles wat met het onderzoek te maken heeft.

Algemene publicaties

  • Aagaard, P., Simonsen, E. B., Magnusson, S. P., Larsson, B., & Dyhre-Poulsen, P. (1998). A new concept for isokinetic hamstring:quadriceps muscle strength ratio. The American Journal of Sports Medicine, 26(2), 231-237. Alemdaroğlu, U. (2012). The relationship between muscle strength, anaerobic performance, agility, sprint ability and vertical jump performance in professional basketball players. Journal of Human Kinetics, 31, 149-158. Chaabene, H., Negra, Y., Bouguezzi, R., Capranica, L., Franchini, E., Prieske, O., Hbacha, H., & Granacher, U. (2017). Physical and physiological attributes of wrestlers: An update. Journal of Strength and Conditioning Research, 31(5), 1411-1442. Iossifidou, A., Baltzopoulos, V., & Giakas, G. (2005). Isokinetic knee extension and vertical jumping: Are they related? Journal of Sports Sciences, 23(9), 1121-1127.

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

28 december 2026

Primaire voltooiing (Geschat)

28 januari 2027

Studie voltooiing (Geschat)

28 januari 2027

Studieregistratiedata

Eerst ingediend

2 november 2026

Eerst ingediend dat voldeed aan de QC-criteria

2 november 2026

Eerst geplaatst (Werkelijk)

6 november 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

6 november 2026

Laatste update ingediend die voldeed aan QC-criteria

2 november 2026

Laatst geverifieerd

1 november 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Andere studie-ID-nummers

  • INONU-ISOKINETIC-2026-01
  • IKINETIK-WAnT-2026 (Andere identificatie: Inonu University)

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

NEE

Beschrijving IPD-plan

Individual participant data will not be shared, because participants are minors and the consent forms state that data will be used only for the purposes of this research and kept confidential. Aggregate results will be published.

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

Deze informatie is zonder wijzigingen rechtstreeks van de website clinicaltrials.gov gehaald. Als u verzoeken heeft om uw onderzoeksgegevens te wijzigen, te verwijderen of bij te werken, neem dan contact op met register@clinicaltrials.gov. Zodra er een wijziging wordt doorgevoerd op clinicaltrials.gov, wordt deze ook automatisch bijgewerkt op onze website .

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