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

2. november 2026 opdateret af: 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.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

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.

Undersøgelsestype

Observationel

Tilmelding (Anslået)

21

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

Undersøgelse Kontakt Backup

Studiesteder

    • Malatya
      • Malatya, Malatya, Tyrkiet (Türkiye), 44280
        • Department of Physical Education and Sport Teaching, Faculty of Sports Sciences, Inonu University,
        • Kontakt:
        • Kontakt:
        • Ledende efterforsker:
          • Özgür Eken, PhD, Assoc. Prof
        • Underforsker:
          • Denizhan Caliskan, Dr.

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

15 år til 16 år (Barn)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Han

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

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.

Beskrivelse

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

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Observationsmodeller: COHORT
  • Tidsperspektiver: CROSS_SECTIONAL

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
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.

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.

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.

Andre navne:
  • WAnT

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Isokinetic Peak Torque of the Knee Extensors and Flexors
Tidsramme: 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
Tidsramme: 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)

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Conventional Hamstring-to-Quadriceps (H/Q) Strength Ratio
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Efterforskere

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

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

  • 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.

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

28. december 2026

Primær færdiggørelse (Anslået)

28. januar 2027

Studieafslutning (Anslået)

28. januar 2027

Datoer for studieregistrering

Først indsendt

2. november 2026

Først indsendt, der opfyldte QC-kriterier

2. november 2026

Først opslået (Faktiske)

6. november 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

6. november 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

2. november 2026

Sidst verificeret

1. november 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • INONU-ISOKINETIC-2026-01
  • IKINETIK-WAnT-2026 (Anden identifikator: Inonu University)

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

IPD-planbeskrivelse

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.

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .