Athletic PerformanceNCT07757100
High-Intensity Interval Training Effects on Fitness in Youth Soccer Players
A study testing High-Intensity Interval Training (HIIT) in people with Athletic Performance, run by Ercüment Erdoğan at 1 site in Turkey (Türkiye).
Trial summary
This study aims to investigate the effects of an 8-week high-intensity interval training (HIIT) program on aerobic capacity, anaerobic power, blood lactate levels, and sprint performance in young male soccer players. Twenty-four volunteer U19-category soccer players from Sivasspor A.Ş. Read more about this study
- Who is it for?
- Ages 16 to 18 years, men onlyHealthy volunteers can take part
- Conditions the study is for
- Athletic Performance
- What is being tested?
- High-Intensity Interval Training (HIIT)
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 24 participants
- Where
- 1 siteTurkey (Türkiye)
- Study dates
- 20 Sep 2021to 16 Nov 2021
- 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 18 years
- Men only
- Healthy volunteers accepted
- Child, Adult
Who may be able to join
- Active male soccer player registered in the U19 category at Sivasspor A.Ş. Football Club
- Regularly participating in team training sessions prior to the study
- Voluntary participation with written informed consent obtained from parents or legal guardians
- Free from any injury or health condition preventing participation in high-intensity exercise
Who cannot join
- Presence of a musculoskeletal injury within the past 3 months
- Diagnosis of any cardiovascular, metabolic, or chronic health condition
- Attendance rate below 90% during the 8-week training program
- Withdrawal of consent by participant or parent/legal guardian
Trial locations and contacts
1 site in 1 country.
About this study
Official title: High-Intensity Interval Training in Youth Soccer: Effects on Aerobic Capacity, Anaerobic Power, Lactate Threshold, and Sprint Performance
This study aims to investigate the effects of an 8-week high-intensity interval training (HIIT) program on aerobic capacity, anaerobic power, blood lactate levels, and sprint performance in young male soccer players. Twenty-four volunteer U19-category soccer players from Sivasspor A.Ş. were randomly allocated into an experimental group (n=12), which performed HIIT three days per week for 8 weeks in addition to their regular training, and a control group (n=12), which continued only their routine training program. Anthropometric measurements, resting heart rate, aerobic performance (Yo-Yo IRT1), anaerobic performance (RAST), and blood lactate levels were assessed before and after the intervention period.
Read the detailed description
This experimental study was designed to examine the effects of an 8-week HIIT protocol, applied three days per week, on selected physical performance parameters in youth soccer players. Participants were randomly divided into an experimental group and a control group. Height was measured using a Harpenden stadiometer and body weight using a digital scale. Aerobic performance was assessed using the Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IRT1), with heart rate monitored via a Polar Team Pro 2 device. Anaerobic performance was evaluated using the Running-based Anaerobic Sprint Test (RAST). Blood lactate concentration was measured using a portable lactate analyzer from finger-tip capillary blood samples at rest and following the RAST protocol. All measurements were taken as pre-test and post-test assessments, before and after the 8-week intervention period. The study was approved by the local Clinical Research Ethics Committee (2021/243) and conducted in accordance with the Declaration of Helsinki. Written informed consent was obtained from the parents/legal guardians of all participants prior to testing.
- Conditions
- Athletic Performance
- Being tested
- High-Intensity Interval Training (HIIT)
- Keywords
- HIIT,Soccer, Aerobic Capacity, Anaerobic, Blood Lactate.
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
High-Intensity Interval Training (HIIT)Behavioural
Participants in the HIIT group performed high-intensity interval training three times per week for 8 weeks, in addition to their regular soccer training. Each session consisted of repeated high-intensity running intervals designed to improve aerobic capacity, anaerobic power, and sprint performance.
| Study group | Role | What they receive |
|---|---|---|
| HİİT group | Experimental | Participants in this arm continued their regular soccer training and additionally performed high-intensity interval training (HIIT) three days per week for 8 weeks. Receives: Behavioral: High-Intensity Interval Training (HIIT) |
| Control Group | No intervention | Participants in this arm continued only their existing routine soccer training program, without any additional HIIT intervention, for the 8-week study period. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in Maximal Oxygen Uptake (VO2max)
VO2max was estimated using the Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IRT1), based on total distance covered.
Measured: Baseline and after 8 weeks
Change in Anaerobic Power
Anaerobic power (average power and peak power) was assessed using the Running-based Anaerobic Sprint Test (RAST).
Measured: Baseline and after 8 weeks
Change in Sprint Performance
Sprint time was measured over a 35-meter distance using photocell timing gates during the RAST protocol.
Measured: Baseline and after 8 weeks
Change in Blood Lactate Concentration
Blood lactate levels were measured at the 1st and 5th minute post-exercise using a portable lactate analyzer.
Measured: Baseline and after 8 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted11 Aug 2026
- Study start20 Sep 2021
- Primary completion14 Nov 2021
- Study completion16 Nov 2021
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Athletic PerformanceStudies 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
- Other
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- Participants were randomly allocated into two parallel groups: an experimental group (n=12) that performed high-intensity interval training (HIIT) three days per week for 8 weeks in addition to their regular soccer training, and a control group (n=12) that continued only their regular training program. Both groups were assessed at baseline and after 8 weeks using the same physical performance tests
- Masking
- None (open label)
- Enrolment
- 24 participants (actual)
Sponsor and investigators
- Lead sponsor
- Ercüment Erdoğan
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor-investigator, Ercüment Erdoğan, Ordu University
- Investigators
- Ercüment Erdoğan, PhD, Study director, Ordu University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07757100
- Sponsor's protocol ID
- 2021/243
- Other IDs
- 713865
- Status last verified
- Aug 2026
- First submitted
- 31 Jul 2026
- Last updated
- 11 Aug 2026
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Individual participant data will not be shared, as no formal data-sharing infrastructure or explicit consent for third-party data sharing was obtained from participants and their legal guardians at the time of the study.
Study at a glance
From the registry record, last updated by the sponsor on 11 Aug 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- High-Intensity Interval Training in Youth Soccer: Effects on Aerobic Capacity, Anaerobic Power, Lactate Threshold, and Sprint Performance
- ClinicalTrials.gov ID
- NCT07757100
- Acronym / sponsor ID
- 2021/243
- Conditions
- Athletic Performance
- Keywords
- HIIT,Soccer, Aerobic Capacity, Anaerobic, Blood Lactate.
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 24 participants (actual)
- Lead sponsor
- Ercüment ErdoğanUniversity, hospital or other
- Study start
- 20 Sep 2021 (actual)
- Primary completion
- 14 Nov 2021 (actual)
- Study completion
- 16 Nov 2021 (actual)
- First posted
- 11 Aug 2026 (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.
This study aims to investigate the effects of an 8-week high-intensity interval training (HIIT) program on aerobic capacity, anaerobic power, blood lactate levels, and sprint performance in young male soccer players. Twenty-four volunteer U19-category soccer players from Sivasspor A.Ş. were randomly allocated into an experimental group (n=12), which performed HIIT three days per week for 8 weeks in addition to their regular training, and a control group (n=12), which continued only their routine training program. Anthropometric measurements, resting heart rate, aerobic performance (Yo-Yo IRT1), anaerobic performance (RAST), and blood lactate levels were assessed before and after the intervention period.
Detailed description
This experimental study was designed to examine the effects of an 8-week HIIT protocol, applied three days per week, on selected physical performance parameters in youth soccer players. Participants were randomly divided into an experimental group and a control group. Height was measured using a Harpenden stadiometer and body weight using a digital scale. Aerobic performance was assessed using the Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IRT1), with heart rate monitored via a Polar Team Pro 2 device. Anaerobic performance was evaluated using the Running-based Anaerobic Sprint Test (RAST). Blood lactate concentration was measured using a portable lactate analyzer from finger-tip capillary blood samples at rest and following the RAST protocol. All measurements were taken as pre-test and post-test assessments, before and after the 8-week intervention period. The study was approved by the local Clinical Research Ethics Committee (2021/243) and conducted in accordance with the Declaration of Helsinki. Written informed consent was obtained from the parents/legal guardians of all participants prior to testing.
Study design
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
- Model description
- Participants were randomly allocated into two parallel groups: an experimental group (n=12) that performed high-intensity interval training (HIIT) three days per week for 8 weeks in addition to their regular soccer training, and a control group (n=12) that continued only their regular training program. Both groups were assessed at baseline and after 8 weeks using the same physical performance tests
| Arm | Type | Receives |
|---|---|---|
| HİİT group | Experimental | Behavioral: High-Intensity Interval Training (HIIT)Participants in this arm continued their regular soccer training and additionally performed high-intensity interval training (HIIT) three days per week for 8 weeks. |
| Control Group | No intervention | –Participants in this arm continued only their existing routine soccer training program, without any additional HIIT intervention, for the 8-week study period. |
Who may qualify
- Ages
- 16 to 18 years
- Sex
- Male only
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult
Key inclusion criteria (4 listed)
- Active male soccer player registered in the U19 category at Sivasspor A.Ş. Football Club
- Regularly participating in team training sessions prior to the study
- Voluntary participation with written informed consent obtained from parents or legal guardians
- Free from any injury or health condition preventing participation in high-intensity exercise
Key exclusion criteria (4 listed)
- Presence of a musculoskeletal injury within the past 3 months
- Diagnosis of any cardiovascular, metabolic, or chronic health condition
- Attendance rate below 90% during the 8-week training program
- Withdrawal of consent by participant or parent/legal guardian
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 |
|---|---|---|
| High-Intensity Interval Training (HIIT)Participants in the HIIT group performed high-intensity interval training three times per week for 8 weeks, in addition to their regular soccer training. Each session consisted of repeated high-intensity running intervals designed to improve aerobic capacity, anaerobic power, and sprint performance. | Behavioural | HİİT group |
Primary outcome
Change in Maximal Oxygen Uptake (VO2max)
Time frame: Baseline and after 8 weeks
VO2max was estimated using the Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IRT1), based on total distance covered.
Change in Anaerobic Power
Time frame: Baseline and after 8 weeks
Anaerobic power (average power and peak power) was assessed using the Running-based Anaerobic Sprint Test (RAST).
Change in Sprint Performance
Time frame: Baseline and after 8 weeks
Sprint time was measured over a 35-meter distance using photocell timing gates during the RAST protocol.
Change in Blood Lactate Concentration
Time frame: Baseline and after 8 weeks
Blood lactate levels were measured at the 1st and 5th minute post-exercise using a portable lactate analyzer.
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 11 Aug 2026.
- Individual participant dataSharing planned: No. Individual participant data will not be shared, as no formal data-sharing infrastructure or explicit consent for third-party data sharing was obtained from participants and their legal guardians at the time of the study.
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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.
Ercüment Erdoğan, PhD study director
Ordu University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing High-Intensity Interval Training (HIIT) in people with Athletic Performance, run by Ercüment Erdoğan at 1 site in Turkey (Türkiye).
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 4 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 11 Aug 2026. 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 Turkey (Türkiye). 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?
Change in Maximal Oxygen Uptake (VO2max) (time frame: Baseline and after 8 weeks). The study lists 4 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 11 Aug 2026.