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Flywheel Training Effects on Power and Performance in Youth Olympic Weightlifters (FLY-WL)

28 mei 2026 bijgewerkt door: Ahmed Awad Ahmed Hassan, New Damietta University Hospital

Effects of Flywheel Inertial Training on Lower-Limb Power, Trunk Stability, and Olympic Weightlifting Performance in Youth Athletes

This study investigated the effects of flywheel inertial training on lower-limb power, trunk stability, and Olympic weightlifting performance in youth athletes. Eighteen youth Olympic weightlifters were allocated to a flywheel training group or a control group. Both groups continued their regular weightlifting training over a 10-week intervention period. The experimental group performed additional flywheel-based exercises twice weekly. Outcomes included measures of lower-limb power, trunk inclination during lifting, weightlifting performance, and technical error frequency.

Studie Overzicht

Toestand

Voltooid

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

This study investigated the effects of flywheel inertial training on lower-limb power, trunk stability, and Olympic weightlifting performance in youth athletes. Flywheel training is an eccentric-overload method that has been suggested to enhance neuromuscular adaptations, particularly in power and movement control. Eighteen youth Olympic weightlifters participated in this controlled intervention study and were allocated into a flywheel training group and a control group.

Both groups continued their regular Olympic weightlifting training program, which included technical practice of the snatch and clean, strength exercises, and general physical preparation. The experimental group additionally performed flywheel-based exercises twice per week over a 10-week training period. The intervention was progressively structured to ensure appropriate load adaptation and technical execution.

Outcome measures included assessments of lower-limb power, trunk inclination during lifting positions, performance in the snatch and clean, and technical error frequency. Pre- and post-intervention comparisons were used to evaluate the effects of the training program.

Studietype

Ingrijpend

Inschrijving (Werkelijk)

18

Fase

  • Niet toepasbaar

Contacten en locaties

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

Studie Locaties

  • Egypte
      • Damietta, Egypte, 34517
        • Damietta University, Faculty of Sports Science

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

  • Kind

Accepteert gezonde vrijwilligers

Ja

Beschrijving

Inclusion Criteria:

  • Male youth Olympic weightlifters aged 13-17 years
  • Actively participating in structured Olympic weightlifting training
  • Technical ability to perform snatch and clean lifts
  • Free from musculoskeletal injury at the time of participation
  • Medically fit for resistance training and high-intensity exercise

Exclusion Criteria:

  • Presence of injury limiting participation in training or testing
  • Absence rate greater than 20% of training or intervention sessions
  • Participation in additional structured lower-limb eccentric or flywheel training outside the study program
  • Any medical condition contraindicating resistance training

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

  • Primair doel: Behandeling
  • Toewijzing: Niet-gerandomiseerd
  • Interventioneel model: Parallelle opdracht
  • Masker: Geen (open label)

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Experimenteel: Flywheel Inertial Training Group
Participants in this group performed their regular Olympic weightlifting training program combined with additional flywheel inertial training twice per week for 10 weeks. The flywheel training included lower-limb and trunk exercises such as squats, split squats, Romanian deadlifts, pulling variations, and anti-rotation core exercises. The training was progressively structured to ensure appropriate eccentric overload and technical control.
Gedragsmatig: Flywheel Inertial Training
Flywheel inertial training was performed twice weekly for 10 weeks in addition to regular Olympic weightlifting training. The program included lower-limb and trunk exercises such as squats, split squats, Romanian deadlifts, pulling variations, and core stabilization exercises. The training emphasized eccentric overload and progressive resistance to enhance power production and movement control.
Andere namen:
  • Flywheel resistance training; eccentric overload training
Gedragsmatig: Traditional Weightlifting Training
Participants performed conventional Olympic weightlifting training including snatch and clean and jerk technique practice, squats, pulling exercises, strength exercises, mobility exercises, and general physical preparation according to the regular training program.
Actieve vergelijker: Control Group (Traditional Weightlifting Training)
Participants in this group continued their regular Olympic weightlifting training program only, which included snatch and clean technique practice, strength exercises, pulling derivatives, squats, mobility work, and general physical preparation, without any additional flywheel training.
Gedragsmatig: Traditional Weightlifting Training
Participants performed conventional Olympic weightlifting training including snatch and clean and jerk technique practice, squats, pulling exercises, strength exercises, mobility exercises, and general physical preparation according to the regular training program.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Snatch Performance
Tijdsspanne: Baseline and 10 weeks post-intervention
Snatch performance was assessed as the best successful snatch lift completed by each participant according to technical criteria. The unit of measurement was kilograms (kg). The outcome was analyzed as the change in kilograms from baseline to 10 weeks.
Baseline and 10 weeks post-intervention
Clean Lift Performance
Tijdsspanne: Baseline and 10 weeks post-intervention
Clean lift performance was assessed as the best successful clean lift completed by each participant without performing the jerk phase. The unit of measurement was kilograms (kg). The outcome was analyzed as the change in kilograms from baseline to 10 weeks.
Baseline and 10 weeks post-intervention
Countermovement Jump Height
Tijdsspanne: Baseline and 10 weeks post-intervention
Countermovement jump height was measured to assess lower-limb explosive power. The unit of measurement was centimeters (cm). The outcome was analyzed as the change in centimeters from baseline to 10 weeks.
Baseline and 10 weeks post-intervention
Trunk Inclination Angle During Snatch Receiving Position
Tijdsspanne: Baseline and 10 weeks post-intervention
Trunk inclination angle was measured during the lowest stable snatch receiving position using video-based kinematic analysis. The angle was measured from the vertical reference line passing through the hip joint. The unit of measurement was degrees (°). The outcome was analyzed as the change in degrees from baseline to 10 weeks. A lower angle indicates a more upright trunk position.
Baseline and 10 weeks post-intervention

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Squat Jump Height
Tijdsspanne: Baseline and 10 weeks post-intervention
Squat jump height was measured to assess concentric lower-limb power. The unit of measurement was centimeters (cm). The outcome was analyzed as the change in centimeters from baseline to 10 weeks.
Baseline and 10 weeks post-intervention
Standing Long Jump Distance
Tijdsspanne: Baseline and 10 weeks post-intervention
Standing long jump distance was measured to assess horizontal lower-limb explosive power. The unit of measurement was centimeters (cm). The outcome was analyzed as the change in centimeters from baseline to 10 weeks.
Baseline and 10 weeks post-intervention
Trunk Inclination Angle During Clean Receiving Position
Tijdsspanne: Baseline and 10 weeks post-intervention
Trunk inclination angle was measured during the lowest stable clean receiving position using video-based kinematic analysis. The angle was measured from the vertical reference line passing through the hip joint. The unit of measurement was degrees (°). The outcome was analyzed as the change in degrees from baseline to 10 weeks. A lower angle indicates a more upright trunk position.
Baseline and 10 weeks post-intervention
Total Weightlifting Performance
Tijdsspanne: Baseline and 10 weeks post-intervention
Total weightlifting performance was calculated as the sum of the best successful snatch lift and the best successful clean lift without jerk. The unit of measurement was kilograms (kg). The outcome was analyzed as the change in kilograms from baseline to 10 weeks.
Baseline and 10 weeks post-intervention
Technical Error Frequency During Snatch and Clean Attempts
Tijdsspanne: Baseline and 10 weeks post-intervention
Technical-error frequency was calculated from video analysis by counting the total number of observed technical errors during selected snatch and clean attempts. The coded errors included excessive trunk inclination, forward or backward jump during receiving, unstable receiving position, loss of balance during recovery, and visible bar path deviation. The unit of measurement was number of errors. The outcome was analyzed as the change in number of errors from baseline to 10 weeks.
Baseline and 10 weeks post-intervention

Medewerkers en onderzoekers

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

Sponsor

New Damietta University Hospital

Onderzoekers

  • Hoofdonderzoeker: Ahmed Hassan, PhD, Faculty of Sports Science, Damietta University

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 (Werkelijk)

20 december 2025

Primaire voltooiing (Werkelijk)

27 februari 2026

Studie voltooiing (Werkelijk)

27 februari 2026

Studieregistratiedata

Eerst ingediend

22 mei 2026

Eerst ingediend dat voldeed aan de QC-criteria

28 mei 2026

Eerst geplaatst (Werkelijk)

3 juni 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

3 juni 2026

Laatste update ingediend die voldeed aan QC-criteria

28 mei 2026

Laatst geverifieerd

1 mei 2026

Meer informatie

Termen gerelateerd aan deze studie

Andere studie-ID-nummers

  • DU-FLY-2026

Plan Individuele Deelnemersgegevens (IPD)

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

JA

Beschrijving IPD-plan

Individual participant data (IPD) collected in this study will include anthropometric data, performance measures (snatch, clean, jump tests), trunk kinematic variables, and technical error scores. De-identified data will be shared with qualified researchers upon reasonable request for secondary analysis.

IPD-tijdsbestek voor delen

Data will become available after publication of the primary results and will remain accessible for a period of 5 years following publication.

IPD-toegangscriteria voor delen

Access to the de-identified dataset will be granted upon reasonable request to the principal investigator. Requests must include a brief research proposal and will be evaluated for scientific merit and ethical compliance.

IPD delen Ondersteunend informatietype

  • LEERPROTOCOOL
  • SAP
  • ICF
  • ANALYTIC_CODE

Bestudeer gegevens/documenten

  1. Gegevensset individuele deelnemers
    Informatie-ID: OSF Registry: bc4mp
    Informatie opmerkingen: De-identified individual participant data (IPD) will be available upon reasonable request to the principal investigator after publication. Access is restricted to academic research purposes and subject to ethical approval where required. Supporting materials including study protocol, statistical analysis plan, and analytic code are available via the Open Science Framework (OSF) registry.

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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