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Effects of Unilateral Compound Training on Lower-Limb Strength Asymmetry and Athletic Performance in Female Handball Players (UCT-HB)

10 augustus 2026 bijgewerkt door: Zarife Pancar, University of Gaziantep

Effects of a Six-Week Unilateral Compound Training Program on Lower-Limb Strength Asymmetry and Athletic Performance in Competitive Female Handball Players: A Randomized Controlled Trial

Lower-limb strength asymmetry is common among female handball players and may negatively affect athletic performance while increasing injury risk. This randomized controlled trial was designed to investigate the effects of a six-week unilateral compound training program on lower-limb strength asymmetry, isokinetic muscle strength, hamstring-to-quadriceps ratio, body composition, and physical performance in competitive female handball players. Participants were randomly assigned to either an experimental group receiving unilateral compound training in addition to regular handball training or a control group continuing regular handball training only. It was hypothesized that unilateral compound training would reduce strength asymmetry and improve neuromuscular performance compared with regular training alone.

Studie Overzicht

Toestand

Voltooid

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

emale handball requires repeated sprinting, jumping, rapid changes of direction, and unilateral movements that may contribute to the development of lower-limb strength asymmetries. Such asymmetries have been associated with impaired athletic performance and an increased risk of injury. Although unilateral resistance and plyometric exercises have shown beneficial effects individually, evidence regarding the effectiveness of unilateral compound training in female handball players remains limited.

This randomized controlled trial aimed to evaluate the effects of a six-week unilateral compound training program on lower-limb strength asymmetry, isokinetic knee extensor and flexor strength, hamstring-to-quadriceps ratios, body composition, sprint performance, change-of-direction ability, countermovement jump performance, and single-leg jump performance in competitive female handball players.

Thirty competitive female handball players were randomly assigned to an experimental group or a control group. The experimental group completed unilateral resistance and plyometric exercises three times per week for six weeks in addition to regular handball training, whereas the control group continued regular handball training only. Outcome measures were assessed before and after the intervention using standardized laboratory procedures. The findings of this study are expected to provide evidence regarding the effectiveness of unilateral compound training for reducing lower-limb asymmetry and improving sport-specific performance in female handball athletes.

Studietype

Ingrijpend

Inschrijving (Werkelijk)

30

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

  • Turkije (Türkiye)
      • Gaziantep, Turkije (Türkiye), 27310
        • Gaziantep University, Faculty of Sport Sciences

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

  • Volwassen

Accepteert gezonde vrijwilligers

Ja

Beschrijving

Inclusion Criteria:

  • Female handball players aged 18-25 years.
  • Competing in the Turkish Women's 2nd Handball League.
  • Regular participation in team training (4 sessions/week) and official matches.
  • Voluntary participation with written informed consent.

Exclusion Criteria:

  • Current musculoskeletal injury or pain preventing participation in training.
  • History of lower-limb surgery within the previous 12 months.
  • Neurological, cardiovascular, or other medical conditions affecting exercise participation.
  • Failure to complete the intervention or assessment procedures.

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: Ander
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Parallelle opdracht
  • Masker: Geen (open label)

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Experimenteel: Experimental
Participants received a six-week unilateral compound training program three times per week in addition to their regular handball training.
Gedragsmatig: Unilateral Compound Training
Participants in the experimental group completed a supervised unilateral compound training program three times per week for six weeks in addition to their regular handball training. The intervention consisted of progressive unilateral resistance and plyometric exercises designed to improve lower-limb strength asymmetry, isokinetic muscle strength, neuromuscular performance, sprint performance, change-of-direction ability, and jump performance.
Geen tussenkomst: Control
Participants continued their regular handball training without additional unilateral compound training.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Lower-Limb Strength Asymmetry
Tijdsspanne: Baseline and immediately after the 6-week intervention
Lower-limb strength asymmetry was assessed using isokinetic dynamometry before and after the intervention. Changes in asymmetry between the dominant and non-dominant lower limbs were compared between the experimental and control groups.
Baseline and immediately after the 6-week intervention

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Isokinetic Knee Extensor Strength
Tijdsspanne: Baseline and immediately after the 6-week intervention
Peak torque of the knee extensor muscles measured using an isokinetic dynamometer before and after the intervention.
Baseline and immediately after the 6-week intervention
Isokinetic Knee Flexor Strength
Tijdsspanne: Baseline and immediately after the 6-week intervention
Peak torque of the knee flexor muscles measured using an isokinetic dynamometer.
Baseline and immediately after the 6-week intervention
Hamstring-to-Quadriceps Ratio
Tijdsspanne: Baseline and immediately after the 6-week intervention
Hamstring-to-quadriceps strength ratio calculated from isokinetic knee muscle strength measurements.
Baseline and immediately after the 6-week intervention
20-m Sprint Performance
Tijdsspanne: Baseline and immediately after the 6-week intervention
Sprint time measured over 20 meters.
Baseline and immediately after the 6-week intervention
Change-of-Direction Performance
Tijdsspanne: Baseline and immediately after the 6-week intervention
Change-of-direction performance assessed using the agility test employed in the study protocol.
Baseline and immediately after the 6-week intervention
Countermovement Jump Height
Tijdsspanne: Baseline and immediately after the 6-week intervention
Vertical jump height assessed using the countermovement jump test.
Baseline and immediately after the 6-week intervention

Medewerkers en onderzoekers

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

Sponsor

University of Gaziantep

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)

15 november 2025

Primaire voltooiing (Werkelijk)

30 december 2025

Studie voltooiing (Werkelijk)

10 januari 2026

Studieregistratiedata

Eerst ingediend

25 juni 2026

Eerst ingediend dat voldeed aan de QC-criteria

25 juni 2026

Eerst geplaatst (Werkelijk)

1 juli 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

12 augustus 2026

Laatste update ingediend die voldeed aan QC-criteria

10 augustus 2026

Laatst geverifieerd

1 juni 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Andere studie-ID-nummers

  • 2025-080 (Turkish Medicines and Medical Devices Agency (TITCK))

Plan Individuele Deelnemersgegevens (IPD)

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

NEE

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

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