Change-of-Direction Repeated Sprints in Adolescent Female Basketball Players
29. července 2026 aktualizováno: Engin Güneş Atabaş, Pamukkale University
Effects of Changes of Direction on Repeated-Sprint Performance, Perceived Exertion, and Acute Cardiovascular Responses in Adolescent Female Basketball Players: A Randomized Crossover Study
The purpose of this randomized crossover study was to compare the acute effects of repeated-sprint protocols incorporating different numbers of 180-degree changes of direction in adolescent female basketball players.
Twenty participants completed three exercise conditions in a randomized, counterbalanced order: 10 × 15-m linear sprints, 10 × 15-m sprints incorporating one 180-degree change of direction, and 10 × 15-m sprints incorporating two 180-degree changes of direction.
Each sprint was followed by 30 seconds of passive recovery.
Sprint performance, perceived exertion, heart rate, peripheral oxygen saturation, and systolic and diastolic blood pressure were assessed.
The study examined whether increasing the number of changes of direction affected repeated-sprint performance and acute perceptual and cardiovascular responses.
Přehled studie
Postavení
Dokončeno
Podmínky
Detailní popis
This was an acute, randomized, counterbalanced, three-condition crossover study in which each participant completed all experimental conditions and served as her own control.
Following a standardized warm-up, participants completed one of three repeated-sprint protocols during each experimental condition: 10 × 15-m linear sprints without a change of direction, 10 × 15-m sprints incorporating one 180-degree change of direction, or 10 × 15-m sprints incorporating two 180-degree changes of direction. A 30-second passive recovery period was provided between repetitions. Total sprint distance, number of repetitions, and recovery duration were standardized across the three conditions; only the number of changes of direction differed.
Sprint times were recorded using electronic timing gates. Best, average, and worst sprint times were determined, and sprint decrement and the change from best to worst performance were calculated. Rating of perceived exertion was recorded after each protocol. Heart rate, peripheral oxygen saturation, and systolic and diastolic blood pressure were assessed immediately before and after each condition.
The experimental conditions were compared to determine whether increasing the number of 180-degree changes of direction altered absolute repeated-sprint performance, performance maintenance, perceived exertion, or immediate cardiovascular responses.
Typ studie
Intervenční
Zápis (Aktuální)
20
Fáze
- Nelze použít
Kontakty a umístění
Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.
Studijní místa
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Pamukkale
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Denizli, Pamukkale, Turecko (Türkiye), 20000
- Pamukkale University Sports Sciences and Technology Research and Application Center
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Kritéria účasti
Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.
Kritéria způsobilosti
Věk způsobilý ke studiu
- Dítě
- Dospělý
Přijímá zdravé dobrovolníky
Ano
Popis
Inclusion Criteria:
- Female basketball players aged 16-18 years.
- Currently competing in the U16 or U18 basketball leagues in Denizli, Türkiye.
- At least two years of structured basketball training experience.
- Regular participation in at least three training sessions and one official match per week.
- No injury or illness that could prevent maximal sprint performance.
Exclusion Criteria:
- Reporting an injury before testing that could prevent maximal sprint performance.
- Failure to attend all testing sessions or complete all three experimental conditions.
Studijní plán
Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.
Jak je studie koncipována?
Detaily designu
- Primární účel: Jiný
- Přidělení: Randomizované
- Intervenční model: Crossover Assignment
- Maskování: Žádné (otevřený štítek)
Zbraně a zásahy
Skupina účastníků / Arm |
Intervence / Léčba |
|---|---|
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Experimentální: Sequence 1: Linear-One-COD-Two-COD
Participants assigned to Sequence 1 completed the linear repeated-sprint condition during the first experimental session, the one-COD condition during the second session, and the two-COD condition during the third session.
Consecutive sessions were separated by at least 48 hours.
|
Following a standardized 20-minute dynamic warm-up, participants performed 10 maximal 15-m linear sprints without a change of direction.
Each sprint began from a standing position 0.5 m behind the starting line and was recorded using electronic timing gates.
A 30-second passive recovery period was provided between repetitions, during which participants remained standing.
Following a standardized 20-minute dynamic warm-up, participants performed 10 maximal 15-m repeated sprints.
Each repetition consisted of 7.5 m of forward sprinting followed by one 180-degree change of direction and a 7.5-m return sprint.
Each sprint began from a standing position 0.5 m behind the starting line and was recorded using electronic timing gates.
A 30-second passive recovery period was provided between repetitions, during which participants remained standing.
Following a standardized 20-minute dynamic warm-up, participants performed 10 maximal 15-m repeated sprints.
Each repetition consisted of three consecutive 5-m sections and incorporated two 180-degree changes of direction.
Each sprint began from a standing position 0.5 m behind the starting line and was recorded using electronic timing gates.
A 30-second passive recovery period was provided between repetitions, during which participants remained standing.
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Experimentální: Sequence 2: One-COD-Two-COD-Linear
Participants assigned to Sequence 2 completed the one-COD repeated-sprint condition during the first experimental session, the two-COD condition during the second session, and the linear condition during the third session.
Consecutive sessions were separated by at least 48 hours.
|
Following a standardized 20-minute dynamic warm-up, participants performed 10 maximal 15-m linear sprints without a change of direction.
Each sprint began from a standing position 0.5 m behind the starting line and was recorded using electronic timing gates.
A 30-second passive recovery period was provided between repetitions, during which participants remained standing.
Following a standardized 20-minute dynamic warm-up, participants performed 10 maximal 15-m repeated sprints.
Each repetition consisted of 7.5 m of forward sprinting followed by one 180-degree change of direction and a 7.5-m return sprint.
Each sprint began from a standing position 0.5 m behind the starting line and was recorded using electronic timing gates.
A 30-second passive recovery period was provided between repetitions, during which participants remained standing.
Following a standardized 20-minute dynamic warm-up, participants performed 10 maximal 15-m repeated sprints.
Each repetition consisted of three consecutive 5-m sections and incorporated two 180-degree changes of direction.
Each sprint began from a standing position 0.5 m behind the starting line and was recorded using electronic timing gates.
A 30-second passive recovery period was provided between repetitions, during which participants remained standing.
|
|
Experimentální: Sequence 3: Two-COD-Linear-One-COD
Participants assigned to Sequence 3 completed the two-COD repeated-sprint condition during the first experimental session, the linear condition during the second session, and the one-COD condition during the third session.
Consecutive sessions were separated by at least 48 hours.
|
Following a standardized 20-minute dynamic warm-up, participants performed 10 maximal 15-m linear sprints without a change of direction.
Each sprint began from a standing position 0.5 m behind the starting line and was recorded using electronic timing gates.
A 30-second passive recovery period was provided between repetitions, during which participants remained standing.
Following a standardized 20-minute dynamic warm-up, participants performed 10 maximal 15-m repeated sprints.
Each repetition consisted of 7.5 m of forward sprinting followed by one 180-degree change of direction and a 7.5-m return sprint.
Each sprint began from a standing position 0.5 m behind the starting line and was recorded using electronic timing gates.
A 30-second passive recovery period was provided between repetitions, during which participants remained standing.
Following a standardized 20-minute dynamic warm-up, participants performed 10 maximal 15-m repeated sprints.
Each repetition consisted of three consecutive 5-m sections and incorporated two 180-degree changes of direction.
Each sprint began from a standing position 0.5 m behind the starting line and was recorded using electronic timing gates.
A 30-second passive recovery period was provided between repetitions, during which participants remained standing.
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Co je měření studie?
Primární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
|---|---|---|
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Average Sprint Time
Časové okno: During the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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The mean completion time of the 10 maximal 15-m sprint repetitions, recorded using Witty electronic timing gates and expressed in seconds.
The outcome was calculated separately for the linear, one-COD, and two-COD repeated-sprint conditions.
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During the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Best Sprint Time
Časové okno: During the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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The fastest completion time (lowest value) among the 10 maximal 15-m sprint repetitions, recorded using Witty electronic timing gates and expressed in seconds.
The outcome was determined separately for the linear, one-COD, and two-COD repeated-sprint conditions.
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During the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Worst Sprint Time
Časové okno: During the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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The slowest completion time (highest value) among the 10 maximal 15-m sprint repetitions, recorded using Witty electronic timing gates and expressed in seconds.
The outcome was determined separately for the linear, one-COD, and two-COD repeated-sprint conditions.
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During the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Sekundární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
|---|---|---|
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Sprint Decrement
Časové okno: Calculated from the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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The percentage reduction in performance across the 10 maximal sprint repetitions.
Sprint decrement was calculated separately for each experimental condition using the following formula: Sdec (%) = ([sum of the 10 sprint times / (best sprint time × 10)] - 1) × 100.
Higher values indicate a greater decline in repeated-sprint performance.
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Calculated from the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Worst-to-Best Decrement
Časové okno: Calculated from the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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The percentage difference between the fastest and slowest sprint repetitions, calculated separately for each experimental condition using the following formula: [(worst sprint time - best sprint time) / best sprint time] × 100.
Higher values indicate a greater decline from the best to the worst performance.
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Calculated from the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Rating of Perceived Exertion
Časové okno: Immediately after completion of the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Perceived exertion was assessed using the Borg category-ratio scale ranging from 0 to 10, where 0 represents rest and 10 represents maximal exertion.
Participants rated the overall difficulty of each completed repeated-sprint condition.
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Immediately after completion of the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Heart Rate
Časové okno: Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Heart rate was measured using a Soulfix fingertip pulse oximeter placed on the index finger of the left hand.
Values were recorded in beats per minute before and immediately after each repeated-sprint condition.
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Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Peripheral Oxygen Saturation
Časové okno: Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Peripheral oxygen saturation (SpO2) was measured using a Soulfix fingertip pulse oximeter placed on the index finger of the left hand.
Values were recorded as a percentage before and immediately after each repeated-sprint condition.
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Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Systolic Blood Pressure
Časové okno: Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Systolic blood pressure was measured on the left upper arm using an Omron M2 Essential automated digital blood-pressure monitor.
Values were recorded in millimeters of mercury (mmHg) before and immediately after each repeated-sprint condition.
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Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Diastolic Blood Pressure
Časové okno: Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Diastolic blood pressure was measured on the left upper arm using an Omron M2 Essential automated digital blood-pressure monitor.
Values were recorded in millimeters of mercury (mmHg) before and immediately after each repeated-sprint condition.
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Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.
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Spolupracovníci a vyšetřovatelé
Zde najdete lidi a organizace zapojené do této studie.
Sponzor
Vyšetřovatelé
- Vrchní vyšetřovatel: Engin Güneş Atabaş, PhD, Pamukkale Üniversitesi
Termíny studijních záznamů
Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.
Hlavní termíny studia
Začátek studia (Aktuální)
2. května 2026
Primární dokončení (Aktuální)
21. května 2026
Dokončení studie (Aktuální)
21. května 2026
Termíny zápisu do studia
První předloženo
22. července 2026
První předloženo, které splnilo kritéria kontroly kvality
22. července 2026
První zveřejněno (Aktuální)
27. července 2026
Aktualizace studijních záznamů
Poslední zveřejněná aktualizace (Aktuální)
30. července 2026
Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality
29. července 2026
Naposledy ověřeno
1. července 2026
Více informací
Termíny související s touto studií
Klíčová slova
Další identifikační čísla studie
- PAU-COD-RSA-2026-01
Plán pro data jednotlivých účastníků (IPD)
Plánujete sdílet data jednotlivých účastníků (IPD)?
NE
Popis plánu IPD
Individual participant data will not be publicly shared because participant consent did not include public data sharing and the dataset contains information from adolescent participants.
De-identified aggregate data may be made available from the corresponding author upon reasonable request and subject to institutional and ethical approval.
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