Sports PerformanceFLY-WLNCT07623499
Flywheel Training Effects on Power and Performance in Youth Olympic Weightlifters
A study testing Flywheel Inertial Training and Traditional Weightlifting Training in people with Sports Performance, run by New Damietta University Hospital at 1 site in Egypt.
Trial summary
This study investigated the effects of flywheel inertial training on lower-limb power, trunk stability, and Olympic weightlifting performance in youth athletes. Eighteen youth Olympic weightlifters were allocated to a flywheel training group or a control group. Read more about this study
- Who is it for?
- Ages 13 to 17 years, men onlyHealthy volunteers can take part
- Conditions the study is for
- Sports Performance
- What is being tested?
- Flywheel Inertial Training and Traditional Weightlifting Training
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 18 participants
- Where
- 1 siteEgypt
- Study dates
- 20 Dec 2025to 27 Feb 2026
- 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 13 to 17 years
- Men only
- Healthy volunteers accepted
- Child
Who may be able to join
- Male youth Olympic weightlifters aged 13-17 years
- Actively participating in structured Olympic weightlifting training
- Technical ability to perform snatch and clean lifts
- Free from musculoskeletal injury at the time of participation
- Medically fit for resistance training and high-intensity exercise
Who cannot join
- Presence of injury limiting participation in training or testing
- Absence rate greater than 20% of training or intervention sessions
- Participation in additional structured lower-limb eccentric or flywheel training outside the study program
- Any medical condition contraindicating resistance training
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Effects of Flywheel Inertial Training on Lower-Limb Power, Trunk Stability, and Olympic Weightlifting Performance in Youth Athletes
This study investigated the effects of flywheel inertial training on lower-limb power, trunk stability, and Olympic weightlifting performance in youth athletes. Eighteen youth Olympic weightlifters were allocated to a flywheel training group or a control group. Both groups continued their regular weightlifting training over a 10-week intervention period. The experimental group performed additional flywheel-based exercises twice weekly. Outcomes included measures of lower-limb power, trunk inclination during lifting, weightlifting performance, and technical error frequency.
Read the detailed description
This study investigated the effects of flywheel inertial training on lower-limb power, trunk stability, and Olympic weightlifting performance in youth athletes. Flywheel training is an eccentric-overload method that has been suggested to enhance neuromuscular adaptations, particularly in power and movement control. Eighteen youth Olympic weightlifters participated in this controlled intervention study and were allocated into a flywheel training group and a control group.
Both groups continued their regular Olympic weightlifting training program, which included technical practice of the snatch and clean, strength exercises, and general physical preparation. The experimental group additionally performed flywheel-based exercises twice per week over a 10-week training period. The intervention was progressively structured to ensure appropriate load adaptation and technical execution.
Outcome measures included assessments of lower-limb power, trunk inclination during lifting positions, performance in the snatch and clean, and technical error frequency. Pre- and post-intervention comparisons were used to evaluate the effects of the training program.
- Conditions
- Sports Performance
- Being tested
- Flywheel Inertial Training, Traditional Weightlifting Training
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Flywheel Inertial TrainingBehavioural
Also called Flywheel resistance training; eccentric overload training
Flywheel inertial training was performed twice weekly for 10 weeks in addition to regular Olympic weightlifting training. The program included lower-limb and trunk exercises such as squats, split squats, Romanian deadlifts, pulling variations, and core stabilization exercises. The training emphasized eccentric overload and progressive resistance to enhance power production and movement control.
Traditional Weightlifting TrainingBehavioural
Participants performed conventional Olympic weightlifting training including snatch and clean and jerk technique practice, squats, pulling exercises, strength exercises, mobility exercises, and general physical preparation according to the regular training program.
| Study group | Role | What they receive |
|---|---|---|
| Flywheel Inertial Training Group | Experimental | Participants in this group performed their regular Olympic weightlifting training program combined with additional flywheel inertial training twice per week for 10 weeks. The flywheel training included lower-limb and trunk exercises such as squats, split squats, Romanian deadlifts, pulling variations, and anti-rotation core exercises. The training was progressively structured to ensure appropriate eccentric overload and technical control. Receives: Behavioral: Flywheel Inertial Training; Behavioral: Traditional Weightlifting Training |
| Control Group (Traditional Weightlifting Training) | Active comparator | Participants in this group continued their regular Olympic weightlifting training program only, which included snatch and clean technique practice, strength exercises, pulling derivatives, squats, mobility work, and general physical preparation, without any additional flywheel training. Receives: Behavioral: Traditional Weightlifting Training |
What is being measured
The primary outcome is the main question the study is designed to answer.
Snatch Performance
Snatch performance was assessed as the best successful snatch lift completed by each participant according to technical criteria. The unit of measurement was kilograms (kg). The outcome was analyzed as the change in kilograms from baseline to 10 weeks.
Measured: Baseline and 10 weeks post-intervention
Clean Lift Performance
Clean lift performance was assessed as the best successful clean lift completed by each participant without performing the jerk phase. The unit of measurement was kilograms (kg). The outcome was analyzed as the change in kilograms from baseline to 10 weeks.
Measured: Baseline and 10 weeks post-intervention
Countermovement Jump Height
Countermovement jump height was measured to assess lower-limb explosive power. The unit of measurement was centimeters (cm). The outcome was analyzed as the change in centimeters from baseline to 10 weeks.
Measured: Baseline and 10 weeks post-intervention
Trunk Inclination Angle During Snatch Receiving Position
Trunk inclination angle was measured during the lowest stable snatch receiving position using video-based kinematic analysis. The angle was measured from the vertical reference line passing through the hip joint. The unit of measurement was degrees (°). The outcome was analyzed as the change in degrees from baseline to 10 weeks. A lower angle indicates a more upright trunk position.
Measured: Baseline and 10 weeks post-intervention
Secondary outcomes (5)
Squat Jump Height
Squat jump height was measured to assess concentric lower-limb power. The unit of measurement was centimeters (cm). The outcome was analyzed as the change in centimeters from baseline to 10 weeks.
Measured: Baseline and 10 weeks post-intervention
Standing Long Jump Distance
Standing long jump distance was measured to assess horizontal lower-limb explosive power. The unit of measurement was centimeters (cm). The outcome was analyzed as the change in centimeters from baseline to 10 weeks.
Measured: Baseline and 10 weeks post-intervention
Trunk Inclination Angle During Clean Receiving Position
Trunk inclination angle was measured during the lowest stable clean receiving position using video-based kinematic analysis. The angle was measured from the vertical reference line passing through the hip joint. The unit of measurement was degrees (°). The outcome was analyzed as the change in degrees from baseline to 10 weeks. A lower angle indicates a more upright trunk position.
Measured: Baseline and 10 weeks post-intervention
Total Weightlifting Performance
Total weightlifting performance was calculated as the sum of the best successful snatch lift and the best successful clean lift without jerk. The unit of measurement was kilograms (kg). The outcome was analyzed as the change in kilograms from baseline to 10 weeks.
Measured: Baseline and 10 weeks post-intervention
Technical Error Frequency During Snatch and Clean Attempts
Technical-error frequency was calculated from video analysis by counting the total number of observed technical errors during selected snatch and clean attempts. The coded errors included excessive trunk inclination, forward or backward jump during receiving, unstable receiving position, loss of balance during recovery, and visible bar path deviation. The unit of measurement was number of errors. The outcome was analyzed as the change in number of errors from baseline to 10 weeks.
Measured: Baseline and 10 weeks post-intervention
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted3 Jun 2026
- Study start20 Dec 2025
- Primary completion27 Feb 2026
- Study completion27 Feb 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Sports 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
- Treatment
- Allocation
- Non-randomised
- Intervention model
- Parallel groups
- Model description
- Participants were allocated into two parallel groups: a flywheel inertial training group and a control group continuing regular weightlifting training.
- Masking
- None (open label)
- Enrolment
- 18 participants (actual)
Sponsor and investigators
- Lead sponsor
- New Damietta University Hospital
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Ahmed Awad Ahmed Hassan, New Damietta University Hospital
- Investigators
- Ahmed Hassan, PhD, Principal investigator, Faculty of Sports Science, Damietta University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07623499
- Sponsor's protocol ID
- DU-FLY-2026
- Acronym
- FLY-WL
- Status last verified
- May 2026
- First submitted
- 22 May 2026
- Last updated
- 3 Jun 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes: Individual participant data (IPD) collected in this study will include anthropometric data, performance measures (snatch, clean, jump tests), trunk kinematic variables, and technical error scores. De-identified data will be shared with qualified researchers upon reasonable request for secondary analysis.
Study at a glance
From the registry record, last updated by the sponsor on 3 Jun 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effects of Flywheel Inertial Training on Lower-Limb Power, Trunk Stability, and Olympic Weightlifting Performance in Youth Athletes
- ClinicalTrials.gov ID
- NCT07623499
- Acronym / sponsor ID
- FLY-WL / DU-FLY-2026
- Conditions
- Sports Performance
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 18 participants (actual)
- Lead sponsor
- New Damietta University HospitalUniversity, hospital or other
- Study start
- 20 Dec 2025 (actual)
- Primary completion
- 27 Feb 2026 (actual)
- Study completion
- 27 Feb 2026 (actual)
- First posted
- 3 Jun 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 investigated the effects of flywheel inertial training on lower-limb power, trunk stability, and Olympic weightlifting performance in youth athletes. Eighteen youth Olympic weightlifters were allocated to a flywheel training group or a control group. Both groups continued their regular weightlifting training over a 10-week intervention period. The experimental group performed additional flywheel-based exercises twice weekly. Outcomes included measures of lower-limb power, trunk inclination during lifting, weightlifting performance, and technical error frequency.
Detailed description
This study investigated the effects of flywheel inertial training on lower-limb power, trunk stability, and Olympic weightlifting performance in youth athletes. Flywheel training is an eccentric-overload method that has been suggested to enhance neuromuscular adaptations, particularly in power and movement control. Eighteen youth Olympic weightlifters participated in this controlled intervention study and were allocated into a flywheel training group and a control group.
Both groups continued their regular Olympic weightlifting training program, which included technical practice of the snatch and clean, strength exercises, and general physical preparation. The experimental group additionally performed flywheel-based exercises twice per week over a 10-week training period. The intervention was progressively structured to ensure appropriate load adaptation and technical execution.
Outcome measures included assessments of lower-limb power, trunk inclination during lifting positions, performance in the snatch and clean, and technical error frequency. Pre- and post-intervention comparisons were used to evaluate the effects of the training program.
Study design
- Primary purpose
- Treatment
- Allocation
- Non-randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
- Model description
- Participants were allocated into two parallel groups: a flywheel inertial training group and a control group continuing regular weightlifting training.
| Arm | Type | Receives |
|---|---|---|
| Flywheel Inertial Training Group | Experimental | Behavioral: Flywheel Inertial Training, Behavioral: Traditional Weightlifting TrainingParticipants in this group performed their regular Olympic weightlifting training program combined with additional flywheel inertial training twice per week for 10 weeks. The flywheel training included lower-limb and trunk exercises such as squats, split squats, Romanian deadlifts, pulling variations, and anti-rotation core exercises. The training was progressively structured to ensure appropriate eccentric overload and technical control. |
| Control Group (Traditional Weightlifting Training) | Active comparator | Behavioral: Traditional Weightlifting TrainingParticipants in this group continued their regular Olympic weightlifting training program only, which included snatch and clean technique practice, strength exercises, pulling derivatives, squats, mobility work, and general physical preparation, without any additional flywheel training. |
Who may qualify
- Ages
- 13 to 17 years
- Sex
- Male only
- Healthy volunteers
- Accepted
- Age groups
- Child
Key inclusion criteria (5 listed)
- Male youth Olympic weightlifters aged 13-17 years
- Actively participating in structured Olympic weightlifting training
- Technical ability to perform snatch and clean lifts
- Free from musculoskeletal injury at the time of participation
- Medically fit for resistance training and high-intensity exercise
Key exclusion criteria (4 listed)
- Presence of injury limiting participation in training or testing
- Absence rate greater than 20% of training or intervention sessions
- Participation in additional structured lower-limb eccentric or flywheel training outside the study program
- Any medical condition contraindicating resistance training
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 |
|---|---|---|
| Flywheel Inertial TrainingAlso: Flywheel resistance training; eccentric overload trainingFlywheel inertial training was performed twice weekly for 10 weeks in addition to regular Olympic weightlifting training. The program included lower-limb and trunk exercises such as squats, split squats, Romanian deadlifts, pulling variations, and core stabilization exercises. The training emphasized eccentric overload and progressive resistance to enhance power production and movement control. | Behavioural | Flywheel Inertial Training Group |
| Traditional Weightlifting TrainingParticipants performed conventional Olympic weightlifting training including snatch and clean and jerk technique practice, squats, pulling exercises, strength exercises, mobility exercises, and general physical preparation according to the regular training program. | Behavioural | Control Group (Traditional Weightlifting Training), Flywheel Inertial Training Group |
Primary outcome
Snatch Performance
Time frame: Baseline and 10 weeks post-intervention
Snatch performance was assessed as the best successful snatch lift completed by each participant according to technical criteria. The unit of measurement was kilograms (kg). The outcome was analyzed as the change in kilograms from baseline to 10 weeks.
Clean Lift Performance
Time frame: Baseline and 10 weeks post-intervention
Clean lift performance was assessed as the best successful clean lift completed by each participant without performing the jerk phase. The unit of measurement was kilograms (kg). The outcome was analyzed as the change in kilograms from baseline to 10 weeks.
Countermovement Jump Height
Time frame: Baseline and 10 weeks post-intervention
Countermovement jump height was measured to assess lower-limb explosive power. The unit of measurement was centimeters (cm). The outcome was analyzed as the change in centimeters from baseline to 10 weeks.
Trunk Inclination Angle During Snatch Receiving Position
Time frame: Baseline and 10 weeks post-intervention
Trunk inclination angle was measured during the lowest stable snatch receiving position using video-based kinematic analysis. The angle was measured from the vertical reference line passing through the hip joint. The unit of measurement was degrees (°). The outcome was analyzed as the change in degrees from baseline to 10 weeks. A lower angle indicates a more upright trunk position.
5 secondary outcomes
Squat Jump Height
Time frame: Baseline and 10 weeks post-intervention
Standing Long Jump Distance
Time frame: Baseline and 10 weeks post-intervention
Trunk Inclination Angle During Clean Receiving Position
Time frame: Baseline and 10 weeks post-intervention
Total Weightlifting Performance
Time frame: Baseline and 10 weeks post-intervention
Technical Error Frequency During Snatch and Clean Attempts
Time frame: Baseline and 10 weeks post-intervention
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 3 Jun 2026.
- Individual participant dataSharing planned: Yes. Individual participant data (IPD) collected in this study will include anthropometric data, performance measures (snatch, clean, jump tests), trunk kinematic variables, and technical error scores. De-identified data will be shared with qualified researchers upon reasonable request for secondary analysis.
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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.
Ahmed Hassan, PhD principal investigator
Faculty of Sports Science, Damietta 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 Flywheel Inertial Training and Traditional Weightlifting Training in people with Sports Performance, run by New Damietta University Hospital at 1 site in Egypt.
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 5 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 3 Jun 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 Egypt. 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?
Snatch Performance (time frame: Baseline and 10 weeks post-intervention). 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 3 Jun 2026.