Effects of Unilateral and Bilateral Isometric Strength Training Integrated Into an 8-Week Complex Training Program on Neuromuscular Performance in Youth Soccer Players
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 41
- 试验地点
- 1
- 主要终点
- Countermovement Jump Height
研究概览
简要总结
This randomized controlled trial investigates the effects of unilateral and bilateral isometric strength training integrated into an 8-week complex training program on neuromuscular performance in elite youth soccer players. Forty-one male players competing at the national level will be randomly assigned to one of three groups: unilateral isometric training (UNI), bilateral isometric training (BI), or a control group performing the same training program without additional isometric exercises.
All participants will complete a structured complex strength training program once per week for eight weeks during the competitive season. Neuromuscular performance will be assessed before and after the intervention using countermovement jump height, broad jump distance, maximal isometric squat peak force and 30-m sprint time. The aim of the study is to determine whether the mode of isometric training (unilateral vs bilateral) influences adaptations in strength, power and sprint performance in youth soccer players.
An additional objective of the study is to determine whether the type of isometric training intervention influences inter-limb asymmetries in neuromuscular performance. Selected tests will therefore be performed both bilaterally and unilaterally to assess potential differences between dominant and non-dominant limbs.
详细描述
This study is a randomized, parallel-group intervention designed to examine the effects of unilateral and bilateral isometric strength training integrated into an 8-week complex strength training program on neuromuscular performance in elite youth soccer players.
Participants will be recruited from youth teams competing at the national level and randomly assigned to one of three groups: unilateral isometric training (UNI), bilateral isometric training (BI), or a control group (CRL). All groups will perform the same structured complex strength training program once per week for eight weeks during the competitive season. The UNI and BI groups will perform additional isometric exercises at the beginning of each session, whereas the control group will complete the same training program without the isometric component.
The isometric protocol will include three multi-joint exercises: isometric plantar flexion, isometric squat, and isometric hip extension performed against an immovable barbell in a power rack. In the BI group exercises will be performed bilaterally, whereas in the UNI group each limb will be trained separately.
The complex training program will consist of paired resistance and ballistic exercises including squats, jumps, bench press, medicine ball throws, rows, and Romanian deadlifts. Training intensity and volume will progress across two phases during the eight-week intervention.
Neuromuscular performance will be assessed before and after the intervention using countermovement jump height measured with a force plate system, standing broad jump distance, maximal isometric squat peak force measured during an isometric squat test and 30-meter sprint time measured with electronic timing gates.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Basic Science
- 盲法
- None
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 youth soccer players competing at the national level.
- •Age between 15 and 19 years.
- •Minimum of one year of resistance training experience.
- •Regular participation in organized soccer training and strength training.
排除标准
- •Current neuromuscular or musculoskeletal injury or disorder.
- •Injury occurring during the intervention period preventing participation in training or testing.
- •Failure to complete the prescribed training program or attend at least 80% of training sessions.
- •Participation in additional resistance training programs outside the study protocol during the intervention period.
研究组 & 干预措施
Unilateral Isometric Training
Participants perform unilateral isometric strength training integrated into an 8-week complex strength training program.
干预措施: Unilateral Isometric Training (Behavioral)
Bilateral Isometric Training
Participants perform bilateral isometric strength training integrated into an 8-week complex strength training program.
干预措施: Bilateral Isometric Training (Behavioral)
Complex Strength Training
Participants perform the same complex strength training program without additional isometric exercises.
干预措施: Complex Strength Training (Behavioral)
结局指标
主要结局
Countermovement Jump Height
时间窗: Baseline (Week 0) and Week 9
Change in countermovement jump (CMJ) height measured using a dual force plate system. Jump height will be calculated using the impulse-momentum method and expressed in centimeters (cm).
30-Meter Sprint Time
时间窗: Baseline (Week 0) and Week 9
Change in linear sprint performance measured during a 30-meter sprint test using electronic timing gates. Sprint time will be recorded in seconds (s) using electronic timing gates positioned at positioned at 0 m, 5 m, and 30 m.
Maximal Isometric Squat Peak Force
时间窗: Baseline (Week 0) and Week 9
Change in maximal isometric squat peak force measured during an isometric squat test performed on a dual force plate system. Peak force will be expressed in Newtons (N).
次要结局
- Reactive Strength Index Modified (RSI-mod)(Baseline (Week 0) and Week 9)
- Standing Broad Jump Distance(Baseline (Week 0) and Week 9)
- Inter-Limb Asymmetry Index(Baseline (Week 0) and Week 9)