Acute Effects of Unilateral Isometric Conditioning Activity on Sprinting Speed, Jump Performance, Change of Direction Ability and Neuromuscular Function in Elite Youth Soccer Players (U15-U19)
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 13
- 试验地点
- 1
- 主要终点
- Sprint time at 5 m and 30 m
研究概览
简要总结
This study aims to examine the acute effects of an isometric conditioning activity on sprinting, jumping, and change-of-direction performance in elite youth soccer players. Twelve male soccer players aged 15-19 years from a professional academy will participate in a randomized crossover study. Each participant will complete two experimental sessions separated by one week.
During each session, participants will perform a standardized warm-up followed by baseline performance tests including countermovement jumps, drop jumps, a 30-m sprint test, and a 505 change-of-direction test. After baseline testing, participants will complete one of two conditions in randomized order: (1) an isometric conditioning activity consisting of unilateral standing isometric calf raises, or (2) a control condition consisting of low-intensity treadmill walking. Performance tests will be repeated seven minutes after the intervention to assess acute changes in neuromuscular performance.
Jump performance will be assessed using a dual force plate system sampling at 1000 Hz, and sprint performance will be measured using electronic timing gates. The study will be conducted on an indoor athletics runway located in a gymnasium. The results will help determine whether isometric conditioning activities can acutely enhance explosive performance in youth soccer players.
详细描述
This study investigates the acute effects of an isometric conditioning activity on neuromuscular performance in elite youth soccer players. The study uses a randomized crossover design in which participants complete two experimental conditions in a randomized order.
Twelve male soccer players aged 15-19 years from a professional soccer academy competing in the Polish league system will be recruited. Eligible participants must have at least one year of resistance training experience, regularly participate in organized soccer and strength training and be free from neuromuscular or musculoskeletal disorders.
Each participant will complete two testing sessions separated by seven days. Each session will begin with a standardized warm-up consisting of cycling, dynamic mobility exercises and submaximal jumps. Baseline testing will include two countermovement jumps (CMJ), two drop jumps (DJ) from a 45-cm box, one maximal 30-m sprint and two 505 change-of-direction tests performed using the dominant and non-dominant leg.
Following baseline testing, participants will complete one of two conditions:
i) Isometric conditioning activity (experimental condition): unilateral standing isometric calf raises performed as 3 sets of 3 repetitions with a 3-second contraction for each repetition with a 3-minute rest period between sets.
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
- None
盲法说明
This study is conducted as an open-label trial. Participants and investigators are aware of the assigned condition. Performance outcomes are measured using objective instrumentation including force plates and electronic timing gates. The order of experimental conditions was randomized using a computer generated randomization sequence "random.org".
入排标准
- 年龄范围
- 14 Years 至 19 Years（Child, Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •Male soccer players aged 14-19 years
- •Currently participating in organized soccer training within a competitive soccer academy
- •Minimum of one year of experience in resistance training
- •Regular participation in both soccer training and resistance training for at least one year prior to the study
- •Free from neuromuscular and musculoskeletal disorders that could affect performance
排除标准
- •Presence of any current musculoskeletal injury affecting the lower limbs.
- •History of neuromuscular disorders or medical conditions that could influence physical performance
- •Any injury or health condition preventing maximal sprinting or jumping efforts during testing.
结局指标
主要结局
Sprint time at 5 m and 30 m
时间窗: Baseline and 7 minutes post-intervention
Sprint time measured during a maximal 30-m sprint from a two-point staggered start using electronic timing gates. Split times are recorded at 5 m and 30 m to assess acceleration and overall sprint performance.
505 Change of Direction Test Time
时间窗: Baseline and 7 minutes post-intervention
Time required to complete the 505 change-of-direction test performed using both the dominant and non-dominant leg.
次要结局
- Countermovement Jump Height(Baseline and 7 minutes post-intervention)
- Drop Jump Reactive Strength Index(Baseline and 7 minutes post-intervention)