Healthy Adult ParticipantsNCT07577011
Impact of Abdominal Muscle-Induced Fatigue on Hip Muscle Performance and Functional Balance in Healthy Adults
An observational study of Healthy Adult Participants, run by Cairo University at 1 site in Egypt.
Trial summary
The study is based on the theory that the abdominal muscles contribute to transverse and frontal plane torques that complement hip abductor torque, as both muscle groups act in the same counterclockwise direction within the proposed biomechanical model. Read more about this study
- Who is it for?
- Ages 20 to 25 yearsHealthy volunteers can take part
- Conditions the study is for
- Healthy Adult Participants
- What is being tested?
- Isokinetic Dynamometer for fatiguing abdominal muscles and assessing hip Muscle Performance, and balance assessment using star excursion test and single leg balance test
- How many people
- 70 participants
- Where
- 1 siteEgypt
- Study dates
- 1 May 2026to 30 Jan 2027
- How long will I take part?
- 1 Week
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
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 20 to 25 years
- All sexes
- Healthy volunteers accepted
- Adult
Study population: The study population consists of 70 healthy, non-athletic students aged between 20 and 25 years. These participants were specifically selected to maintain homogeneity in the data, ensuring they possess the necessary physical capacity to perform the required isokinetic contractions and manual muscle tests while remaining free from recent injury, musculoskeletal pain, or neurological conditions that could compromise the accuracy of the balance and strength assessments.
Who may be able to join
- Healthy colleague male students aged 20-25 years (Cerda et al., 2018).
- No history of low back, hip, knee or pelvic surgery in past year (Hietamo et al., 2021).
- Physically able to perform isokinetic contractions against isokinetic dynamometer (Babiloni et al., 2025).
- Body mass index (BMI) from 18 to 25 (Milanese et al., 2025).
- Abdominal and Hip manual muscle test of 4 or above (Ciesla et al.,2011).
Who cannot join
- Current musculoskeletal pain in trunk, hip, or lower limb (Hietamo et al., 2021).
- Neurological disorders affecting balance (e.g vertebra basilar insufficiency) or muscle performance (Pongmala et al., 2024).
- Recent participation (48-72 h) in strenuous trunk/hip exercise that might confound fatigue measures (Foucher et al., 2021).
- Participation in athletic activities (Elliott et al., 2021).
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Egypt1 site
Degla Palms
Giza, Giza Governorate, 12534
Ahmed Samir Abdel Latif, MSc in Biomechanics, 01222832888, ahmedsamir9430@gmail.com
About this study
The study is based on the theory that the abdominal muscles contribute to transverse and frontal plane torques that complement hip abductor torque, as both muscle groups act in the same counterclockwise direction within the proposed biomechanical model. Through their role in trunk and pelvic stabilization, the abdominal muscles help optimize the mechanical environment in which the hip abductors operate, potentially enhancing their effective torque production during functional tasks.
This shared torque direction suggests a functional interdependence between core and hip musculature, whereby deficits or fatigue in the abdominal muscles may compromise hip abductor performance and load distribution at the hip joint. Clinically, this relationship supports the integration of abdominal muscle assessment and targeted core rehabilitation into the evaluation and management of hip-related injuries, with the potential to improve movement control, reduce injury risk, and enhance treatment outcomes. A quasi-experimental, within-subject study conducted at the Isokinetic Laboratory, Faculty of Physical Therapy, Cairo University, to examine the effect of abdominal muscle-induced fatigue on hip muscle strength, endurance, and functional balance. Seventy healthy male college students aged 20-25 years will be assessed before and after an isokinetic abdominal fatigue protocol using an isokinetic dynamometer. Outcome measures include isokinetic hip muscle strength and endurance, as well as balance assessed by the Single Leg Stance Test and Star Excursion Balance Test. The study procedure consists of participant preparation, baseline assessment, abdominal muscle fatigue induction, and immediate post-fatigue reassessment. Sample size was determined using G*Power to ensure adequate statistical power, and data will be analyzed using one-way within-subject MANOVA with significance set at p \< 0.05. This study holds critical importance for advancing both biomechanical theory and clinical practice by directly investigating a key, yet under-quantified, link in the human kinetic chain: the specific impact of abdominal muscle fatigue on hip muscle performance and functional balance. By employing instrumented (Isokinetic dynamometer, star excursion balance test and single leg stance test)., pre- and post-fatigue measurements in a healthy non-athletic population, it will generate novel empirical evidence clarifying how core endurance directly influences proximal stability and distal function. Clinically, the outcomes promise to transform assessment and rehabilitation paradigms-shifting focus from isolated hip treatment toward integrated core-hip strategies-ultimately informing more effective injury prevention programs, optimizing movement efficiency, and enhancing rehabilitation outcomes for both athletic and general populations.
- Conditions
- Healthy Adult Participants
- Being tested
- Isokinetic Dynamometer for fatiguing abdominal muscles and assessing hip Muscle Performance, and balance assessment using star excursion test and single leg balance test
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Isokinetic Dynamometer for fatiguing abdominal muscles and assessing hip Muscle Performance, and balance assessment using star excursion test and single leg balance testOther
To assess physical performance, this study utilizes three specialized tools to measure strength, endurance, and balance. The isokinetic dynamometer serves as the clinical "gold standard" for quantifying muscle performance, providing highly standardized and sensitive data to induce abdominal muscle fatigue and evaluate the strength and endurance of the hip musculature. For balance assessment, the study uses the Star Excursion Balance Test (SEBT) to measure dynamic postural control; by recording the maximum distance a participant can reach while standing on one leg, it identifies sensorimotor deficits and provides a reliable index of stability. Complementing this is the Single Leg Stance (SLS) test, a validated, straightforward method for evaluating static balance by measuring the duration a participant can maintain a barefoot, one-legged position. Together, these tools provide a comprehensive evaluation of both strength-based fatigue and multi-directional stability.
| Study group | Role | What they receive |
|---|---|---|
| Study Group | Seventy healthy colleague students aged from 20 to 25 will participate in this study, they will all be placed in one group that will be tested before and after the abdominal muscle fatigue protocol for their hip muscle strength, endurance using Isokinetic dynamometer and functional balance using star excursion test and single leg balance test Receives: Other: Isokinetic Dynamometer for fatiguing abdominal muscles and assessing hip Muscle Performance, and balance assessment using star excursion test and single leg balance test |
What is being measured
The primary outcome is the main question the study is designed to answer.
Hip Abductors Muscle Strength
Assess hip Abductor muscle strength using Isokinetic Dynamometer after fatiguing the abdominal muscles Unite: N.m
Measured: One week
Hip Extensor Muscle Strength
Assess hip Extensor muscle strength using Isokinetic Dynamometer after fatiguing the abdominal muscles Unite: N.m
Measured: One week
Hip Flexor Muscle Strength
Assess hip Abductor muscle strength using Isokinetic Dynamometer after fatiguing the abdominal muscles Unite: N.m
Measured: One Week
Hip Adductor Muscle Strength
Assess hip Abductor muscle strength using Isokinetic Dynamometer after fatiguing the abdominal muscles Unite: N.m
Measured: One Week
Secondary outcomes (6)
Hip Abductor Endurance Test
Assess hip Abductor muscle endurance using Isokinetic Dynamometer after fatiguing the abdominal muscles Measured by Fatigue Index
Measured: One Week
Hip Extensor Endurance Testing
Assess hip Extensor muscle endurance using Isokinetic Dynamometer after fatiguing the abdominal muscles Measured by Fatigue Index
Measured: One Week
Hip Flexor Endurance Testing
Assess hip Flexor muscle endurance using Isokinetic Dynamometer after fatiguing the abdominal muscles Measured by Fatigue Index
Measured: One Week
Hip Adductor Endurance Testing
Assess hip Adductor muscle endurance using Isokinetic Dynamometer after fatiguing the abdominal muscles Measured by Fatigue Index
Measured: One Week
Balance Testing Using Star Excursion test
Balance testing after abdominal muscle fatigue using star excursion test Unite: Seconds
Measured: One week
Balance Testing Using Single Leg Stance Test
Balance testing after abdominal muscle fatigue using Single Leg Stance Test Unite: Seconds
Measured: One Week
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted8 May 2026
- Study start1 May 2026 (estimated)
- Primary completion31 Dec 2026 (estimated)
- Study completion30 Jan 2027 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Healthy Adult ParticipantsStudies of the same condition, open and under way.
- More trials run by Cairo UniversityThe sponsor's other registered studies.
- 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
- Observational
- Observational model
- Other
- Time perspective
- Prospective
- Enrolment
- 70 participants (estimated)
- Target duration
- 1 Week
Sponsor and investigators
- Lead sponsor
- Cairo University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Ahmed Samir Abdellatif, Cairo University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07577011
- Sponsor's protocol ID
- P.T.REC/012/006299
- Status last verified
- May 2026
- First submitted
- 26 Apr 2026
- Last updated
- 8 May 2026
- Results posted
- No
- Data monitoring committee
- Yes
- 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 8 May 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Impact of Abdominal Muscle-Induced Fatigue on Hip Muscle Performance and Functional Balance in Healthy Adults
- ClinicalTrials.gov ID
- NCT07577011
- Acronym / sponsor ID
- P.T.REC/012/006299
- Conditions
- Healthy Adult Participants
- Study type
- Observational
- Recruitment status
- Not yet recruiting
- Enrolment
- 70 participants (estimated)
- Lead sponsor
- Cairo UniversityUniversity, hospital or other
- Study start
- 1 May 2026 (estimated)
- Primary completion
- 31 Dec 2026 (estimated)
- Study completion
- 30 Jan 2027 (estimated)
- First posted
- 8 May 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.
The study is based on the theory that the abdominal muscles contribute to transverse and frontal plane torques that complement hip abductor torque, as both muscle groups act in the same counterclockwise direction within the proposed biomechanical model. Through their role in trunk and pelvic stabilization, the abdominal muscles help optimize the mechanical environment in which the hip abductors operate, potentially enhancing their effective torque production during functional tasks.
This shared torque direction suggests a functional interdependence between core and hip musculature, whereby deficits or fatigue in the abdominal muscles may compromise hip abductor performance and load distribution at the hip joint. Clinically, this relationship supports the integration of abdominal muscle assessment and targeted core rehabilitation into the evaluation and management of hip-related injuries, with the potential to improve movement control, reduce injury risk, and enhance treatment outcomes. A quasi-experimental, within-subject study conducted at the Isokinetic Laboratory, Faculty of Physical Therapy, Cairo University, to examine the effect of abdominal muscle-induced fatigue on hip muscle strength, endurance, and functional balance. Seventy healthy male college students aged 20-25 years will be assessed before and after an isokinetic abdominal fatigue protocol using an isokinetic dynamometer. Outcome measures include isokinetic hip muscle strength and endurance, as well as balance assessed by the Single Leg Stance Test and Star Excursion Balance Test. The study procedure consists of participant preparation, baseline assessment, abdominal muscle fatigue induction, and immediate post-fatigue reassessment. Sample size was determined using G*Power to ensure adequate statistical power, and data will be analyzed using one-way within-subject MANOVA with significance set at p \< 0.05. This study holds critical importance for advancing both biomechanical theory and clinical practice by directly investigating a key, yet under-quantified, link in the human kinetic chain: the specific impact of abdominal muscle fatigue on hip muscle performance and functional balance. By employing instrumented (Isokinetic dynamometer, star excursion balance test and single leg stance test)., pre- and post-fatigue measurements in a healthy non-athletic population, it will generate novel empirical evidence clarifying how core endurance directly influences proximal stability and distal function. Clinically, the outcomes promise to transform assessment and rehabilitation paradigms-shifting focus from isolated hip treatment toward integrated core-hip strategies-ultimately informing more effective injury prevention programs, optimizing movement efficiency, and enhancing rehabilitation outcomes for both athletic and general populations.
Study design
- Observational model
- Other
- Time perspective
- Prospective
- Target follow-up
- 1 Week
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Study Group | – | Other: Isokinetic Dynamometer for fatiguing abdominal muscles and assessing hip Muscle Performance, and balance assessment using star excursion test and single leg balance testSeventy healthy colleague students aged from 20 to 25 will participate in this study, they will all be placed in one group that will be tested before and after the abdominal muscle fatigue protocol for their hip muscle strength, endurance using Isokinetic dynamometer and functional balance using star excursion test and single leg balance test |
Who may qualify
- Ages
- 20 to 25 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
- Study population
- The study population consists of 70 healthy, non-athletic students aged between 20 and 25 years. These participants were specifically selected to maintain homogeneity in the data, ensuring they possess the necessary physical capacity to perform the required isokinetic contractions and manual muscle tests while remaining free from recent injury, musculoskeletal pain, or neurological conditions that could compromise the accuracy of the balance and strength assessments.
Key inclusion criteria (5 listed)
- Healthy colleague male students aged 20-25 years (Cerda et al., 2018).
- No history of low back, hip, knee or pelvic surgery in past year (Hietamo et al., 2021).
- Physically able to perform isokinetic contractions against isokinetic dynamometer (Babiloni et al., 2025).
- Body mass index (BMI) from 18 to 25 (Milanese et al., 2025).
- Abdominal and Hip manual muscle test of 4 or above (Ciesla et al.,2011).
Key exclusion criteria (4 listed)
- Current musculoskeletal pain in trunk, hip, or lower limb (Hietamo et al., 2021).
- Neurological disorders affecting balance (e.g vertebra basilar insufficiency) or muscle performance (Pongmala et al., 2024).
- Recent participation (48-72 h) in strenuous trunk/hip exercise that might confound fatigue measures (Foucher et al., 2021).
- Participation in athletic activities (Elliott et al., 2021).
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 |
|---|---|---|
| Isokinetic Dynamometer for fatiguing abdominal muscles and assessing hip Muscle Performance, and balance assessment using star excursion test and single leg balance testTo assess physical performance, this study utilizes three specialized tools to measure strength, endurance, and balance. The isokinetic dynamometer serves as the clinical "gold standard" for quantifying muscle performance, providing highly standardized and sensitive data to induce abdominal muscle fatigue and evaluate the strength and endurance of the hip musculature. For balance assessment, the study uses the Star Excursion Balance Test (SEBT) to measure dynamic postural control; by recording the maximum distance a participant can reach while standing on one leg, it identifies sensorimotor deficits and provides a reliable index of stability. Complementing this is the Single Leg Stance (SLS) test, a validated, straightforward method for evaluating static balance by measuring the duration a participant can maintain a barefoot, one-legged position. Together, these tools provide a comprehensive evaluation of both strength-based fatigue and multi-directional stability. | Other | Study Group |
Primary outcome
Hip Abductors Muscle Strength
Time frame: One week
Assess hip Abductor muscle strength using Isokinetic Dynamometer after fatiguing the abdominal muscles Unite: N.m
Hip Extensor Muscle Strength
Time frame: One week
Assess hip Extensor muscle strength using Isokinetic Dynamometer after fatiguing the abdominal muscles Unite: N.m
Hip Flexor Muscle Strength
Time frame: One Week
Assess hip Abductor muscle strength using Isokinetic Dynamometer after fatiguing the abdominal muscles Unite: N.m
Hip Adductor Muscle Strength
Time frame: One Week
Assess hip Abductor muscle strength using Isokinetic Dynamometer after fatiguing the abdominal muscles Unite: N.m
6 secondary outcomes
Hip Abductor Endurance Test
Time frame: One Week
Hip Extensor Endurance Testing
Time frame: One Week
Hip Flexor Endurance Testing
Time frame: One Week
Hip Adductor Endurance Testing
Time frame: One Week
Balance Testing Using Star Excursion test
Time frame: One week
Balance Testing Using Single Leg Stance Test
Time frame: One Week
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 8 May 2026.
- 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.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Healthy Adult Participants, run by Cairo University 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: opening soon, as of the sponsor's last update on 8 May 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?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Ahmed Samir Abdel Latif, MSc in Biomechanics (01222832888, ahmedsamir9430@gmail.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Hip Abductors Muscle Strength (time frame: One week). 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 8 May 2026.