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Completed

NCT Number: NCT07727850

Change-of-Direction Repeated Sprints in Adolescent Female Basketball Players

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.

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Key information

Conditions

Athletic Performance

Age range

16 year–18 year

Sex eligibility

Female

Study type

Interventional

Phase

Not applicable

Primary location

Pamukkale University Sports Sciences and Technology Research and Application Center

Denizli, Pamukkale, 20000, Turkey (Türkiye)

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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.

Treatment and study plan

Linear Repeated-Sprint Protocol

Behavioral

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.

One-COD Repeated-Sprint Protocol

Behavioral

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.

Two-COD Repeated-Sprint Protocol

Behavioral

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.

Primary outcomes

  1. Average Sprint Time

    Time frame: During the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.

    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.

  2. Best Sprint Time

    Time frame: During the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.

    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.

  3. Worst Sprint Time

    Time frame: During the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.

    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.

Secondary outcomes

  1. Sprint Decrement

    Time frame: Calculated from the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.

    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.

  2. Worst-to-Best Decrement

    Time frame: Calculated from the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.

    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.

  3. Rating of Perceived Exertion

    Time frame: Immediately after completion of the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.

    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.

  4. Heart Rate

    Time frame: Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.

    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.

  5. Peripheral Oxygen Saturation

    Time frame: Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.

    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.

  6. Systolic Blood Pressure

    Time frame: Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.

    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.

  7. Diastolic Blood Pressure

    Time frame: Immediately before and immediately after the repeated-sprint protocol in Sessions 1, 2, and 3 on Study Days 1, 3, and 5, respectively.

    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.

Sponsors and collaborators

Lead sponsor

Pamukkale University

Other

Registry information

Official study title

Effects of Changes of Direction on Repeated-Sprint Performance, Perceived Exertion, and Acute Cardiovascular Responses in Adolescent Female Basketball Players: A Randomized Crossover Study

Important dates

Study start
2026
Primary completion
2026
Study completion
2026
First posted
Jul 27, 2026
Registry last updated
Jul 30, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

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This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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