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Sitting study probes hidden link between tight hamstrings and spine shape

NCT ID NCT07682142

Knowledge-focused Sponsor: Cairo University Source: ClinicalTrials.gov ↗

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Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
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Cancelled before anyone took part.

Expanded access (not trials)

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When the status isn't known

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First seen Jul 02, 2026 · Last updated Jul 07, 2026 · Updated 2 times

Summary

This observational study looks at whether tight hamstrings are related to the curve of the lower back in healthy adults who sit for more than six hours a day. Researchers measure hamstring flexibility and lumbar spine angle while participants sit upright, slumped, and leaning forward. The goal is to better understand how sitting posture and muscle tightness interact, which could eventually help improve comfort and prevent problems for people with desk jobs.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If a clear link is found, it could inform better ergonomic advice or physical therapy strategies for people who sit for long hours.
What could go wrong
This is an observational study with no intervention, so it cannot prove cause and effect. Results may not apply to people with back pain or other conditions.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 110 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Aug 2026

An estimate. Start dates often move.

Expected to finish

Dec 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Sedentary adults of both sexes, aged 18 to 45 years, recruited from the Nasser institute hospital, and the surrounding community. Eligible participants are healthy individuals with a sedentary lifestyle (more than six hours of sitting per day and a physical-activity level below 600 MET-minutes per week on the International Physical Activity Questionnaire), a body mass index below 30 kg/m², and bilateral hamstring tightness, with no current low back pain or other excluding musculoskeletal, neurological, or spinal conditions

Ages

18 to 45 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Healthy adults aged 18-45 years. * Sedentary occupation requiring \> 6 hours of sitting per day. * Active Knee Extension (AKE) angle \>15°. * Bilateral hamstring tightness. * Sedentary individual as determined by IPAQ (MET≤ 600 min/week). * Asymptomatic for low back pain at the time of testing. Exclusion Criteria: * History of significant low back pain requiring medical treatment in the past 12 months. * Previous spinal surgery or structural spinal deformities. * Lower extremity injury or surgery within the past 6 months. * Neurological disorders affecting sensation or movement. * Pregnant female or get birth in the last year. * Body mass index (BMI) ≥ 30 kg/m². * postural deviations resulting from shortening of the iliopsoas and erector spinae or insufficiency of the core stabilizers and hip extensors

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Conditions

The condition(s) this trial relates to.

Lordosis Sedentary Behavior

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Hamstring tightness Lumbar lordosis Posture sitting position Sedentary behavior

How to take part

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  1. The study's own enquiry address

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  2. The places running it

    1 site. The list below names each one and where it is.

  3. The official record

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    Open the record ↗

  4. A doctor treating you

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Contacts and locations

Locations

  • Nasser institute hospital

    Cairo, Shubra Misr, 12616, Egypt

    Contact Email: •••••@•••••

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