An observational study in Sports Injury Risk, Lower Extremity Injuries and Physical Fitness, sponsored by Istanbul Gelisim University. Completed at 1 site in Turkey (Türkiye). Open to male participants aged 18 Years to 35 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-10-09.
Sponsored by Istanbul Gelisim University · Observational
Among 52 studies in Athletic Injuries with a site in Turkey — 10 open to participants now, 12 under way, none of them phase 3. Athletic Injuries · Turkey.
Among the 52 studies in Athletic Injuries with a site in Turkey, this one is the 18th largest by enrollment of the 21 observational ones that give a count, is one of 4 that started in 2025, is one of 21 observational ones, and was the 50th registered.
258 studies on the registry are indexed under Athletic Injuries; 45 are open to participants now.
Browse Athletic Injuries studies →10 of the 52 studies in Athletic Injuries with a site in Turkey are open now. Recruiting first, the newest first:
Uskudar University · Sites in Turkey
Toros University · Sites in Turkey
Izmir Democracy University · Sites in Turkey
Atılım University · Sites in Turkey
Muzaffer Agir · Sites in Turkey
A study can be open while its sites in Turkey have not opened yet or have stopped. Only those recruiting at a site in Turkey →
Of the 21 Athletic Injuries studies recruiting now, 2 (10%) set no upper age limit and 18 (86%) stop at 75 or younger; 11 take children under 18; 8 take healthy volunteers.
This study: 18 Years to 35 Years · male · healthy volunteers too.
The full table on the hub →This tab as a report to print or save as PDF → With an account.
52 studies; the count open now beside each. This study's row is marked.
First in 2017; this study’s year is marked. 4 started in 2025.
This study's enrollment of 28 is below the median of 100 across 91 observational studies indexed under Athletic Injuries.
Median enrollment 44 across the 31 interventional studies, 60 across the 21 observational. Of the 38 that completed or were terminated, 1 (3%) have results posted.
This tab as a report to print or save as PDF → With an account.
None of the 52 has an industry lead sponsor. The 10 most frequent:
Istanbul Gelisim University is the lead sponsor of 64 studies on the registry; 8 are open to participants now.
Istanbul Gelisim University has 3 studies filed under Athletic Injuries — fewer than ten, so there is no comparison to draw.
4 of the studies in Athletic Injuries with a site in Turkey that are under way reach primary completion within a year, 0 of them phase 3. Phase 3 first, then by date:
| Study | Primary completion |
|---|---|
| NCT07760103Uskudar UniversityCore Endurance Versus Segmental Stabilization Exercise in Recreational Athletes With Low Back Pain | 2026-12-01 |
| NCT07913217Uludag UniversityPNF Effects on Volleyball Performance | 2027-02-01 |
| NCT07705698Toros UniversityNordic vs Blood Flow Restriction Nordic Exercise in Elite Female Pole Vaulters | 2027-03 |
| NCT06996990Izmir Democracy UniversityInjury Risk Factors in Volleyball Players | 2027-05-15 |
Among the 52 studies in Athletic Injuries with a site in Turkey, from their registry updates:
This tab as a report to print or save as PDF → With an account.
This prospective observational study aims to investigate the relationship between pre-season physical capacities and lower-extremity injury risk during the competitive season in professional male soccer players.
A total of 28 healthy professional male soccer players aged 18-35 years, with at least five years of training experience, will be included in the study. Participants will undergo comprehensive physical performance assessments during the pre-season period without being assigned to any experimental intervention or additional exercise program.
Baseline assessments will include anthropometric measurements, countermovement jump (CMJ) performance, overhead squat assessment, aerobic fitness using the 30-15 Intermittent Fitness Test (30-15 IFT), eccentric hamstring strength using the NordBord system, and hip abduction and adduction strength using the GroinBar system. Inter-limb strength asymmetries will also be evaluated.
Following the pre-season assessments, participants will be monitored for lower-extremity injuries during the competitive season. Injury information, including anatomical location, injury type, duration, and recurrence, will be collected from club physiotherapists and coaching staff.
The primary objective is to examine whether pre-season physical performance characteristics, particularly hamstring strength, hip muscle strength, and inter-limb strength differences, are associated with subsequent lower-extremity injury occurrence.
The findings may contribute to a better understanding of the relationship between pre-season physical capacity and injury risk in professional soccer and may help sports medicine professionals, physiotherapists, and strength and conditioning coaches identify relevant physical performance indicators for athlete monitoring.
The study population consists of 28 healthy male professional soccer players aged 18-35 years who actively participate in professional league competitions. Eligible participants have at least five years of soccer training experience and regularly attend a minimum of five training sessions per week. Players without current illness or injury and without a history of lower-extremity injury during the preceding six months undergo standardized pre-season physical performance assessments. Participants are subsequently followed for lower-extremity injury occurrence during the competitive season.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Male professional soccer players aged 18-35 years. At least five years of structured soccer training experience. Active participation in professional league competitions at national or international level.
Regular participation in at least five soccer training sessions per week. Being free from any current illness or injury. No history of lower-extremity injury within the preceding six months. Voluntary participation in the study. Provision of written before participation.
Exclusion Criteria:
Being younger than 18 or older than 35 years. Having fewer than five years of soccer training experience. Participating in fewer than five training sessions per week. Presence of an illness or current musculoskeletal injury. History of lower-extremity injury within the previous six months. Alcohol consumption or regular medication use, as specified in the study protocol.
Refusal to provide written .
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
A prospective observational cohort consisting of 28 professional male soccer players aged 18-35 years with at least five years of training experience. Participants undergo pre-season physical performance assessments, including anthropometric measurements, countermovement jump (CMJ), overhead squat assessment, aerobic fitness using the 30-15 Intermittent Fitness Test, eccentric hamstring strength using the NordBord system, and hip abduction and adduction strength using the GroinBar system. Lower-extremity injury occurrence, anatomical location, injury type, duration, and recurrence are subsequently monitored during the competitive season using records obtained from club physiotherapists and coaching staff. No randomization or experimental training intervention is performed.
Diagnostic Test: Pre-Season Physical Performance Assessment
Participants undergo standardized pre-season physical performance assessments, including countermovement jump, overhead squat, 30-15 Intermittent Fitness Test, eccentric hamstring strength assessment using the NordBord system, and hip abduction and adduction strength assessment using the GroinBar system. These assessments are performed to investigate associations between baseline physical capacities and subsequent lower-extremity injury occurrence. No experimental exercise intervention is administered.
Incidence of Lower Extremity Injuries
Lower-extremity injury occurrence will be monitored following pre-season physical performance assessments. Injury data will be obtained from club physiotherapists and coaching staff. The number of injuries, anatomical location (e.g., hamstring, hip, and knee), injury type, duration, and recurrence will be recorded. The outcome will be used to examine associations between pre-season physical capacities and subsequent injury occurrence in professional soccer players.
Time frame: From Baseline Through 12 Months of Follow-up
Maximal Eccentric Hamstring Strength
Maximal eccentric knee flexor force of the right and left legs will be assessed using the NordBord system (VALD Performance, Australia). Force will be measured using integrated load cells operating at a sampling frequency of 50 Hz. Maximal force values will be recorded separately for each leg and expressed in newtons (N).
Time frame: Baseline (Pre-season Assessment)
Hamstring Inter-Limb Strength Asymmetry
Inter-limb strength asymmetry will be determined from the eccentric hamstring force measurements obtained using the NordBord system. Differences between right- and left-leg force production will be recorded and expressed as a percentage (%).
Time frame: Baseline (Pre-season Assessment)
Hip Abduction Strength
Hip abduction strength will be evaluated bilaterally using the GroinBar system. Participants will be assessed in a supine position. Three repetitions will be performed for each leg, and the highest recorded force value will be used for analysis. Measurements will be obtained separately for the dominant and non-dominant limbs.
Time frame: Baseline (Pre-season Assessment)
Countermovement Jump Height
Lower-body explosive performance will be assessed using the countermovement jump (CMJ) test with the Witty system. Participants will perform two maximal jump trials following standardized instructions. Jump performance will be recorded in centimeters (cm).
Time frame: Baseline (Pre-season Assessment)
Overhead Squat Movement Assessment Score
Movement quality will be assessed using the overhead squat test. Participants perform two repetitions while shoulder, trunk, hip, knee, and ankle movement patterns are visually observed. The regional observation scores are combined into a single overall movement assessment score (unitless), which is the only value reported for this outcome measure.
Time frame: Baseline (Pre-season Assessment)
Estimated Maximal Oxygen Uptake (VO2max)
Aerobic fitness will be evaluated using the 30-15 Intermittent Fitness Test (30-15 IFT). Participants will perform progressive 40-meter shuttle runs consisting of 30-second running periods separated by 15-second recovery intervals. Running speed will increase by 0.5 km/h at each stage. Maximal oxygen uptake (VO2max) will be estimated from test performance using the Buchheit equation and expressed in mL/kg/min.
Time frame: Baseline (Pre-season Assessment)
Hip Adduction Strength
Hip adduction strength will be evaluated bilaterally using the GroinBar system. Participants will be assessed in a supine position. Three repetitions will be performed for each leg, and the highest recorded force value will be used for analysis. Measurements will be obtained separately for the dominant and non-dominant limbs.
Time frame: Baseline (Pre-season Assessment)
Ran from Oct 2025 to primary completion in Oct 2026, 12 months.
Of 35 non-industry observational studies under Athletic Injuries, half reached primary completion within 10 months of starting (the median), counting those still running; a quarter within 3 and three quarters within 12. This study's 12 months is above that.
Counting every sponsor, half of 35 studies reached it within 10 months; a quarter within 3 and three quarters within 12.
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
This study is completed, as verified in Oct 2026. You cannot join it, but the record below documents what was studied.
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Istanbul Gelisim University