Eccentric and Trunk Stability Exercise Program Effects in Young Soccer Players

NCT04329273 | Completed

• 1 other identifier: ERC-005/2020
• Study Type: interventional
• Target: 21
• Locations: 1 country
• Sites: 1

Brief Summary

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.

Conditions

Muscle Strength; Postural Balance

Outcome Measures

Primary Outcomes (2)

• Peak concentric and eccentric torque of hamstrings and quadriceps

  Peak torque (N.m) is measured using isokinetic dynamometer at each angular velocity (30°·s-1, 180°·s-1, 240°·s-1).

  Change from baseline assessment at 8 weeks

• Total sway of the center of pressure (CoP)

  This is defined as the average distance (mm) of the CoP from the reference lines and the amplitude is its standard deviation

  Change from baseline assessment at 8 weeks

Secondary Outcomes (5)

• Angle at peak torque of hamstrings and quadriceps

  Change from baseline assessment at 8 weeks

• Conventional hamstrings to quadriceps ratio

  Change from baseline assessment at 8 weeks

• Dynamic hamstrings to quadriceps ratio

  Change from baseline assessment at 8 weeks

• Mixed hamstrings to quadriceps ratio

  Change from baseline assessment at 8 weeks

• Average speed of CoP

  Change from baseline assessment at 8 weeks

Study Arms (2)

Training group

EXPERIMENTAL

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.

Other: Sliding leg curl; Other: Balance training; Other: Core stability

Control group

NO INTERVENTION

The participants in this group will follow only the usual training program

Interventions

Sliding leg curl OTHER

The exercise protocol consists of the following sets and repetitions Week 1- 2 sessions with 2 sets of 6 repetitions Week 2- 2 sessions with 3 sets of 6 repetitions Week 3- 2 sessions with 4 sets of 6 repetitions Week 4- 2 sessions with 4 sets of 8 repetitions Week 5- 2 sessions with 4 sets of 10 repetitions Week 6- 2 sessions with 4 sets of 10 repetitions Week 7- 2 sessions with 4 sets of 8 repetitions Week 8- 2 sessions with 4 sets of 8 repetitions

Training group

Balance training OTHER

The exercise protocol consists of 2 sessions/week with 4 sets of 30'' single stance. Week 1 and 2- 1 set of 30'' single leg stance and 3 sets of 30'' single leg stance and ball kicks with contralateral foot Week 3 and 4- 2 sets of 30'' single leg stance while moving the ball around the leg with the contralateral foot and 2 sets of 30'' single leg stance, moving a ball around the knee with hands and kicking a ball with contralateral foot Week 5 and 6- 2 sets of 30'' single leg stance while giving and receiving hand passes with medicine ball (in couples) and 2 sets of 30'' single leg stance with perturbations (in couples) Week 7 and 8- Same as week 5 and 6 with extra 15" in each repetition

Training group

Core stability OTHER

The exercise protocol consists of the following sets and repetitions Week 1 and 2- 3 sets of 30'' front plank, 3 sets of 20'' side plank, 2 sets of 30'' superman, 2 sets of 30'' supine bridge and 2 sets of 10 repetitions leg lowering exercise Week 3 and 4- increasing difficulty in 2 of the sets Week 5 and 6- adding 1 more set at each exercise Week 7 and 8- adding 15" in each repetition

Training group

Eligibility Criteria

• Age: 16 Years - 19 Years
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64)

You may qualify if:

• to 19 years old soccer players
• Trained at least 3 times and played 1 match weekly, the past 4 years
• Healthy
• Free from muscle injuries in the 6 months prior to the study

You may not qualify if:

• 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

Sponsors & Collaborators

• Konstantinos Dafkou: lead

Study Sites (1)

Laboratory of Neuromechanics, Department of physical education and sport sciences, Aristotle University of Thessaloniki

Serres, 62110, Greece

Location

MeSH Terms

Interventions

Core Stability

Intervention Hierarchy (Ancestors)

Postural Balance; Proprioception; Vestibulocochlear Physiological Phenomena; Physiological Phenomena; Musculoskeletal Physiological Phenomena; Musculoskeletal and Neural Physiological Phenomena; Sensation; Nervous System Physiological Phenomena

Study Officials

• Konstantinos Dafkou

  Laboratory of Neuromechanics, Aristotle University of Thessaloniki

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: PARTICIPANT, INVESTIGATOR
• Purpose: BASIC SCIENCE
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR INVESTIGATOR
• PI Title: Principal Investigator

Study Record Dates

• First Submitted: March 29, 2020
• First Posted: April 1, 2020
• Study Start: February 15, 2020
• Primary Completion: June 30, 2020
• Study Completion: July 5, 2020
• Last Updated: July 16, 2020

Record last verified: 2020-07

Data Sharing

• IPD Sharing: Will not share

Locations

GR (1)