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Effects of Drop Jump During Warm-up on Athletic Performance and Ankle Stability in Young Basketball Players

17. juni 2026 opdateret af: Giacomo Belmonte, University of Palermo

Effects of Drop Jump During Warm-up on Jumping Ability, Sprint Performance and Ankle Landing Stability: A Randomized Controlled Study

Youth basketball is a sport that requires high levels of power and speed. Regardless of the competitive level, young athletes undergo rigorous training to enhance their coordination, neuromuscular reactivity, jump height, and sprint speed. Each youth basketball player voluntarily underwent testing at the same sports facility after reading and signing the informed consent document (provided by parents or legal guardians). During the first session, general anthropometric information was collected on all participants (age, weight, and height), followed by an assessment of athletic performance and stability parameters. For the vertical jump performance parameters, the Counter Movement Jump test (CMJ) was used through an optical detecting system. A pressure platform was used to measure ankle stability during the landing phase using a single-leg jump protocol, while acceleration performance was evaluated via a 10-meter sprint test. Subsequently, participants were randomly divided into two groups: an experimental group (EG) and a control group (CG). The EG performed a Drop Jump protocol at the end of warm-up, consisting of three sets of 5 repetitions, with a 3-minute rest period between sets, for a total duration of 8 weeks. At the end of the eight weeks, all measurements regarding the evaluated outcomes (vertical jump height, CMJ, landing ankle stability, and 10-meter sprint) were repeated for both groups.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

22

Fase

  • Ikke anvendelig

Kontakter og lokationer

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

Studiesteder

  • Italien
    • Palermo
      • Palermo, Palermo, Italien, 90144
        • University of Palermo

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

  • Barn

Tager imod sunde frivillige

Ingen

Beskrivelse

Inclusion Criteria:

  • Active participation in competitive training programs (at least 7 hours per week), at least one year of experience in competitions organized by the Italian Basketball Federation, and no recent injuries.

Exclusion Criteria:

  • Presence of current or not fully recovered injuries to the ankle or foot, and irregular participation in training sessions within the three weeks preceding the study.

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Andet
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Enkelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Drop Jump (DJ)
The participants performed a multi-phase warm-up and then completed 3 sets of 5 repetitions of drop jumps with a 3-minute rest period, twice a week for a total of 8 weeks.
Andet: Drop Jump
Three sets, each consisting of 5 repetitions with 3-minute breaks between sets, to be performed twice a week. During each DJ trial, the participants were asked to perform a maximum vertical jump with their hands at their sides as soon as possible after touching the ground. They were also given 15 seconds to climb back onto the drop and perform another trial.
Ingen indgriben: Control Group (CG)
The participants followed the same full warm-up protocol as the experimental group, with the exception of the drop jump

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Counter Movement Jump (CMJ)
Tidsramme: At the beginning of enrollment ( Baseline, T0) and the end of the 8-week treatment (T1)
Initially, the athlete stands upright on a flat surface or force platform, feet shoulder-width apart, hands on hips (to eliminate arm swing). Without a pause, the athlete performs a quick downward movement (countermovement) by bending the knees and hips, then immediately jumps vertically as high as possible. The athlete lands in an upright position on the same spot, trying to absorb the impact with knees slightly bent. Jump height and flight time is recorded using an optical system, Optojump™ system(Microgate, Bolzano, Italy) connected to a personal computer with dedicated software(OptojumpTM Next software). The system consists of two optical bars, a receiver and a transmitter, positioned 1m apart. The bars identify ground contact time(with a precision of 1ms) and then convert non-contact time into cm. Based on recommendations on optimal jump height (20 to 60cm).
At the beginning of enrollment ( Baseline, T0) and the end of the 8-week treatment (T1)
Ankle Landing Stability
Tidsramme: At the beginning of enrollment ( Baseline, T0) and the end of the 8-week treatment (T1)
Ankle stability was assessed using a functional monopodalic protocol, which involved four jumps on one foot: two per leg, both frontally and laterally. These jumps were performed by stepping over an adjustable obstacle set at 70% of the maximum height reached on a pressure platform (SensorMedica freeMed 40×40, Guidonia Montecelio, Italy). The platform has an active sensory surface of 40×40 cm with a thickness of only 8 mm and a low weight of approximately 4 kg. Inside, there are resistive sensors coated in 24K gold on conductive rubber, with a density of approximately 10,000 sensors/m².The acquisition frequency is high, up to 400 Hz, allowing for detailed dynamic analysis, and the sensors have a life cycle of over 1,000,000 cycles of use
At the beginning of enrollment ( Baseline, T0) and the end of the 8-week treatment (T1)
Sprint Performance
Tidsramme: At the beginning of enrollment ( Baseline, T0) and the end of the 8-week treatment (T1)
Two cones were placed 10 meters apart. The participants were then asked to perform 3 sprints, with 3-minute recovery periods in between. A manual stopwatch was used, which was started exactly when the operator gave the start signal and stopped exactly as the subject passed the second cone.
At the beginning of enrollment ( Baseline, T0) and the end of the 8-week treatment (T1)

Samarbejdspartnere og efterforskere

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

Sponsor

University of Palermo

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 (Faktiske)

2. marts 2026

Primær færdiggørelse (Faktiske)

27. april 2026

Studieafslutning (Faktiske)

27. april 2026

Datoer for studieregistrering

Først indsendt

17. juni 2026

Først indsendt, der opfyldte QC-kriterier

17. juni 2026

Først opslået (Faktiske)

24. juni 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

24. juni 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

17. juni 2026

Sidst verificeret

1. februar 2026

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Andre undersøgelses-id-numre

  • 62141-2025-3

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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