Effects of an 8-week Eccentric and Trunk Stability Exercise Program on Muscle Strength and Postural Stability in U19 Elite Soccer Players
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 21
- 试验地点
- 1
- 主要终点
- Peak concentric and eccentric torque of hamstrings and quadriceps
研究概览
简要总结
The purpose of the present study is to investigate the effects of an in-season mixed training program on several physiological parameters of soccer players. Twenty-one U19 elite soccer players recruited and randomly assigned to either an 8-week specific training experimental group or a control group. The program will include an eccentric hamstring exercise, static balance exercises and core muscles strengthening exercises. Isokinetic hamstring and quadriceps strength, single leg static balance and lumbopelvic stability will be measured prior and after the intervention.
详细描述
A total of 123 male Under-19 (U19) players from several soccer teams were initially invited for participation in the study after signing informed consent forms. following a second contact with the participants, questionnaire forms with inclusion and exclusion criteria were send for completion.
Based on their self-report and a clinical examination by a health professional, of the 103 players, 42 did not meet the inclusion criteria, while 12 players did not participate for personal reasons. Of the remaining 69 players, 48 players were excluded, including 3 players reporting an anterior cruciate ligament reconstruction, 14 because of lower extremity injury led to more than two weeks absence from training and 10 players because of secondary injuries or health problems that led to loss of training the past 3 months.
A neutral, blinded investigator with no further involvement in the study was responsible for randomized allocation of participants in two groups. All training sessions in the training group will be supervised by a fitness coach, who will ensure that the exercises are performed according to protocol.
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
- Double (Participant, Investigator)
入排标准
- 年龄范围
- 16 Years 至 19 Years（Child, Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •16 to 19 years old soccer players
- •Trained at least 3 times and played 1 match weekly, the past 4 years
- •Free from muscle injuries in the 6 months prior to the study
排除标准
- •History of anterior cruciate ligament rupture
- •History of ankle, hip or knee injury with duration at least 1 week, in the 3 months prior to the study
- •Muscle injury with duration at least 1 week, in the 3 months prior to the study
- •Any reason resulting in 2 weeks loss of training the preceding 6 months
- •Involvement in hamstring strengthening, core stability or balance training program in the 6 months prior to the study
研究组 & 干预措施
Training group
For the balance exercise the participants will perform one-legged stance of certain duration, on a stable surface.
For the sliding leg curl exercise the participants lay supine on a mat, wearing only socks in order to create a slippery surface between their heels and the gym floor. The player begins by extending the hip and having the working leg on knee flexion. The contralateral limb is on hip flexion and knee flexion. The base of support is the shoulder blades, the elbows and the heel of the working leg. After assuming this position, the player begins to extend the knee, as slowly as possible, resisting the low friction properties of the ground.
The core stability program consists of front plank, side planks, supine bridge, leg lowering and superman exercise. These exercises will be performed at the end of the training session, in contrast to the balance and hamstring exercises which will be executed before the training session.
干预措施: Sliding leg curl (Other)
Training group
For the balance exercise the participants will perform one-legged stance of certain duration, on a stable surface.
For the sliding leg curl exercise the participants lay supine on a mat, wearing only socks in order to create a slippery surface between their heels and the gym floor. The player begins by extending the hip and having the working leg on knee flexion. The contralateral limb is on hip flexion and knee flexion. The base of support is the shoulder blades, the elbows and the heel of the working leg. After assuming this position, the player begins to extend the knee, as slowly as possible, resisting the low friction properties of the ground.
The core stability program consists of front plank, side planks, supine bridge, leg lowering and superman exercise. These exercises will be performed at the end of the training session, in contrast to the balance and hamstring exercises which will be executed before the training session.
干预措施: Balance training (Other)
Training group
For the balance exercise the participants will perform one-legged stance of certain duration, on a stable surface.
For the sliding leg curl exercise the participants lay supine on a mat, wearing only socks in order to create a slippery surface between their heels and the gym floor. The player begins by extending the hip and having the working leg on knee flexion. The contralateral limb is on hip flexion and knee flexion. The base of support is the shoulder blades, the elbows and the heel of the working leg. After assuming this position, the player begins to extend the knee, as slowly as possible, resisting the low friction properties of the ground.
The core stability program consists of front plank, side planks, supine bridge, leg lowering and superman exercise. These exercises will be performed at the end of the training session, in contrast to the balance and hamstring exercises which will be executed before the training session.
干预措施: Core stability (Other)
Control group
The participants in this group will follow only the usual training program
结局指标
主要结局
Peak concentric and eccentric torque of hamstrings and quadriceps
时间窗: Change from baseline assessment at 8 weeks
Peak torque (N.m) is measured using isokinetic dynamometer at each angular velocity (30°·s-1, 180°·s-1, 240°·s-1).
Total sway of the center of pressure (CoP)
时间窗: Change from baseline assessment at 8 weeks
This is defined as the average distance (mm) of the CoP from the reference lines and the amplitude is its standard deviation
次要结局
- Average speed of CoP(Change from baseline assessment at 8 weeks)
- Conventional hamstrings to quadriceps ratio(Change from baseline assessment at 8 weeks)
- Angle at peak torque of hamstrings and quadriceps(Change from baseline assessment at 8 weeks)
- Mixed hamstrings to quadriceps ratio(Change from baseline assessment at 8 weeks)
- Dynamic hamstrings to quadriceps ratio(Change from baseline assessment at 8 weeks)
研究者
Konstantinos Dafkou
Principal Investigator
Aristotle University Of Thessaloniki