Muscle StrengthNCT04329273
Eccentric and Trunk Stability Exercise Program Effects in Young Soccer Players
A study testing Sliding leg curl, Balance training and Core stability in people with Muscle Strength and Postural Balance, run by Konstantinos Dafkou at 1 site in Greece.
Trial 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. Read more about this study
- Who is it for?
- Ages 16 to 19 years, men onlyHealthy volunteers can take part
- Conditions the study is for
- Muscle Strength, Postural Balance
- What is being tested?
- Sliding leg curl, Balance training and Core stability
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 21 participants
- Where
- 1 siteGreece
- Study dates
- 15 Feb 2020to 5 Jul 2020
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 16 to 19 years
- Men only
- Healthy volunteers accepted
- Child, Adult
Who may be able to join
- 16 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
Who cannot join
- 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
Trial locations and contacts
1 site in 1 country.
Greece1 site
Laboratory of Neuromechanics, Department of physical education and sport sciences, Aristotle University of Thessaloniki
Serres, 62110
About this study
Official title: Effects of an 8-week Eccentric and Trunk Stability Exercise Program on Muscle Strength and Postural Stability in U19 Elite Soccer Players
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.
Read the detailed description
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.
- Conditions
- Muscle Strength, Postural Balance
- Being tested
- Sliding leg curl, Balance training, Core stability
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Sliding leg curlOther
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
Balance trainingOther
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
Core stabilityOther
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
| Study group | Role | What they receive |
|---|---|---|
| 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. Receives: 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 |
What is being measured
The primary outcome is the main question the study is designed to answer.
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).
Measured: 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
Measured: Change from baseline assessment at 8 weeks
Secondary outcomes (5)
Angle at peak torque of hamstrings and quadriceps
The angle at which peak torque of hamstrings and quadriceps muscles was achieved, at each angular velocity, measured in degrees (°)
Measured: Change from baseline assessment at 8 weeks
Conventional hamstrings to quadriceps ratio
This is calculated by dividing peak isokinetic concentric hamstring strength by the peak isokinetic concentric quadriceps strength, at the same angular velocity
Measured: Change from baseline assessment at 8 weeks
Dynamic hamstrings to quadriceps ratio
This is calculated by dividing peak isokinetic eccentric hamstring strength by the peak isokinetic concentric quadriceps strength, at the same angular velocity
Measured: Change from baseline assessment at 8 weeks
Mixed hamstrings to quadriceps ratio
This is calculated by dividing peak isokinetic eccentric hamstring strength at 30°·s-1 by the peak isokinetic concentric quadriceps strength at 240°·s-1
Measured: Change from baseline assessment at 8 weeks
Average speed of CoP
This reflects the amplitude and frequency of CoP movements and is calculated as the total length of the path of CoP divided by the test trial time (mm·s-1 )
Measured: Change from baseline assessment at 8 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted1 Apr 2020
- Study start15 Feb 2020
- Primary completion30 Jun 2020
- Study completion5 Jul 2020
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Muscle StrengthStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind
- Who is masked
- Participant, Investigator
- Enrolment
- 21 participants (actual)
Sponsor and investigators
- Lead sponsor
- Konstantinos Dafkou
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor-investigator, Konstantinos Dafkou, Aristotle University Of Thessaloniki
- Investigators
- Konstantinos Dafkou, Principal investigator, Laboratory of Neuromechanics, Aristotle University of Thessaloniki
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04329273
- Sponsor's protocol ID
- ERC-005/2020
- Status last verified
- Jul 2020
- First submitted
- 29 Mar 2020
- Last updated
- 16 Jul 2020
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 16 Jul 2020. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effects of an 8-week Eccentric and Trunk Stability Exercise Program on Muscle Strength and Postural Stability in U19 Elite Soccer Players
- ClinicalTrials.gov ID
- NCT04329273
- Acronym / sponsor ID
- ERC-005/2020
- Conditions
- Muscle Strength, Postural Balance
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 21 participants (actual)
- Lead sponsor
- Konstantinos DafkouUniversity, hospital or other
- Study start
- 15 Feb 2020 (actual)
- Primary completion
- 30 Jun 2020 (actual)
- Study completion
- 5 Jul 2020 (actual)
- First posted
- 1 Apr 2020 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Detailed description
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.
Study design
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind (participant, investigator)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Training group | Experimental | Other: Sliding leg curl, Other: Balance training, Other: Core stabilityFor 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. |
| Control group | No intervention | –The participants in this group will follow only the usual training program |
Who may qualify
- Ages
- 16 to 19 years
- Sex
- Male only
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult
Key inclusion criteria (4 listed)
- 16 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
Key exclusion criteria (5 listed)
- 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
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Sliding leg curlThe 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 | Other | Training group |
| Balance trainingThe 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 | Other | Training group |
| Core stabilityThe 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 | Other | Training group |
Primary outcome
Peak concentric and eccentric torque of hamstrings and quadriceps
Time frame: 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)
Time frame: 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
5 secondary outcomes
Angle at peak torque of hamstrings and quadriceps
Time frame: Change from baseline assessment at 8 weeks
Conventional hamstrings to quadriceps ratio
Time frame: Change from baseline assessment at 8 weeks
Dynamic hamstrings to quadriceps ratio
Time frame: Change from baseline assessment at 8 weeks
Mixed hamstrings to quadriceps ratio
Time frame: Change from baseline assessment at 8 weeks
Average speed of CoP
Time frame: Change from baseline assessment at 8 weeks
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 16 Jul 2020.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Konstantinos Dafkou principal investigator
Laboratory of Neuromechanics, Aristotle University of Thessaloniki
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Sliding leg curl, Balance training and Core stability in people with Muscle Strength and Postural Balance, run by Konstantinos Dafkou at 1 site in Greece.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 16 Jul 2020. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Greece. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Peak concentric and eccentric torque of hamstrings and quadriceps (time frame: Change from baseline assessment at 8 weeks). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 16 Jul 2020.