The PAPE Paradox During Prolonged Repeated Sprint Performance: Acute Heavy Back-Squat Potentiates Vertical Jump and Early Sprint Performance But Impairs Overall Output-A Randomized Crossover Trial in Trained Soccer Players
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 20
- 试验地点
- 1
- 主要终点
- Repeated Sprint Performance Decrement
研究概览
简要总结
This study examined whether performing heavy back squats before exercise affects jumping ability and repeated sprint performance in trained soccer players. Twenty male university soccer players completed two testing sessions in a randomized crossover design. In one session, participants performed a standardized warm-up only. In the other session, they performed the same warm-up followed by three sets of three back-squat repetitions at 90% of their one-repetition maximum. The two sessions were separated by one week. After each condition, participants completed a countermovement jump test and an 18 × 40-meter repeated sprint test. The study aimed to determine whether the heavy back-squat activity improves early explosive performance and whether it increases fatigue during prolonged repeated sprint exercise.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Basic Science
- 盲法
- Single (Outcomes Assessor)
入排标准
- 年龄范围
- 20 Years 至 23 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •Male soccer players aged 20-23 years.
- •Currently competing in the top division of a university soccer league.
- •A minimum of three years of regular soccer training experience.
- •Free from long-term musculoskeletal injury during the previous six months.
- •Willing and able to complete all familiarization, strength-testing, and experimental sessions.
- •Provision of written informed consent.
排除标准
- •A musculoskeletal injury resulting in an absence from training or competition for 21 days or longer during the previous six months.
- •Use of medications or nutritional or ergogenic supplements that could affect exercise performance.
- •Any health or physical condition preventing safe participation in heavy back-squat, countermovement jump, or repeated sprint testing.
- •Failure to complete both experimental conditions.
结局指标
主要结局
Repeated Sprint Performance Decrement
时间窗: During the 18 × 40-meter repeated sprint test, which lasted approximately 15 minutes and was completed within each of two experimental sessions lasting approximately 25-35 minutes; the sessions were separated by a 1-week washout period.
Percentage decline in repeated sprint performance calculated from sprint times recorded during an 18 × 40-meter shuttle sprint test. The protocol consisted of three sets of six 40-meter shuttle sprints, with 20 seconds of passive recovery between sprints and 4 minutes of passive recovery between sets. Lower percentage values indicate better maintenance of sprint performance and less fatigue.
Countermovement Jump Height
时间窗: At approximately 5 minutes after the assigned condition, within each of two experimental sessions lasting approximately 25-35 minutes; the sessions were separated by a 1-week washout period.
Maximum countermovement jump height measured in centimeters using the Optojump Next optical measurement system. Participants performed three maximal countermovement jump trials with their hands positioned on their hips and 60 seconds of passive recovery between trials. The highest jump height was used for analysis. Higher values indicate better jump performance.
次要结局
- Mean Repeated Sprint Time(During the 18 × 40-meter repeated sprint test, which lasted approximately 15 minutes and was completed within each of two experimental sessions lasting approximately 25-35 minutes; the sessions were separated by a 1-week washout period.)
- Best Sprint Time(During the 18 × 40-meter repeated sprint test, which lasted approximately 15 minutes and was completed within each of two experimental sessions lasting approximately 25-35 minutes; the sessions were separated by a 1-week washout period.)
- Worst Sprint Time(During the 18 × 40-meter repeated sprint test, which lasted approximately 15 minutes and was completed within each of two experimental sessions lasting approximately 25-35 minutes; the sessions were separated by a 1-week washout period.)
- Sprint Time Across Individual Repetitions(During each repetition of the 18 × 40-meter repeated sprint test, which lasted approximately 15 minutes and was completed within each of two experimental sessions lasting approximately 25-35 minutes; the sessions were separated by a 1-week washout period)
研究者
Abdullah Demirli
Istanbul University-Cerrahpaşa
Istanbul University - Cerrahpasa