Lumber Disc ProlapseNCT07871422
H-Reflex-Guided Direction-Sensitive Exercise Versus Standard Extension Exercise for Functional Recovery in Patients With Lumbar Disc Prolapse
A study testing H-Reflex-Guided Direction-Sensitive Exercise and Standard Lumbar Extension Exercise in people with Lumber Disc Prolapse, run by Delta University for Science and Technology at 1 site in Egypt.
Trial summary
This randomized controlled trial will compare H-reflex-guided direction-sensitive exercise with standard extension exercise in patients with lumbar disc prolapse. Participants will be assessed at baseline, after 8 weeks of treatment, and at follow-up. Read more about this study
- Who is it for?
- Ages 30 to 50 years
- Conditions the study is for
- Lumber Disc Prolapse
- What is being tested?
- H-Reflex-Guided Direction-Sensitive Exercise and Standard Lumbar Extension Exercise
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 60 participants
- Where
- 1 siteEgypt
- Study dates
- 5 Oct 2026to 30 Jan 2027
- Phase
- Interventional
- 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 30 to 50 years
- All sexes
- No healthy volunteers
- Adult
Who may be able to join
- Adults aged 30-50 years.
- Clinical diagnosis of lumbar disc prolapse or lumbar disc herniation.
- Presence of low-back pain with unilateral or bilateral radiating leg pain consistent with lumbar radiculopathy.
- Symptoms persisting for at least 4 weeks.
- Pain intensity of at least 3/10 on the Numeric Pain Rating Scale.
- Evidence of neurological involvement, such as dermatomal pain, paresthesia, sensory changes, or a positive straight-leg-raising or slump test.
- Ability to understand and follow verbal and written instructions.
- Ability to attend the scheduled physiotherapy sessions and outcome assessments.
Who cannot join
- Previous lumbar spine surgery.
- Spinal fracture, tumor, infection, or inflammatory spinal disease.
- Cauda equina syndrome or progressive/severe neurological deficit.
- Severe or worsening muscle weakness.
- Bilateral symptoms suggesting serious neurological involvement.
- Hip, sacroiliac, or lower-limb pathology that may affect the outcomes.
Show all 10Show fewer
- Other neurological disorders that could influence H-reflex measurements.
- Serious cardiovascular, metabolic, or systemic disease that contraindicates exercise.
- Pregnancy.
- Current participation in another physiotherapy or exercise program for the same condition.
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
Nile Physio Clinic
Al Mansurah
Ibrahim Abu Ella, PhD, ibrahimneuron@gmail.com
About this study
Official title: H-Reflex-Guided Direction-Sensitive Exercise Versus Standard Extension Exercise for Functional Recovery in Patients With Lumbar Disc Prolapse: A Randomized Controlled Trial
This randomized controlled trial will compare H-reflex-guided direction-sensitive exercise with standard extension exercise in patients with lumbar disc prolapse. Participants will be assessed at baseline, after 8 weeks of treatment, and at follow-up. The study will evaluate changes in H-reflex parameters, low-back and leg pain, disability, straight-leg-raising performance, lumbar range of motion, functional performance, perceived recovery, and treatment adherence. The study aims to determine whether individualized exercise based on neurophysiological responses provides greater clinical and functional benefits than standard extension exercise.
Read the detailed description
This study will be conducted as a two-arm, parallel-group randomized controlled trial to compare H-reflex-guided direction-sensitive exercise with standard extension exercise in patients with lumbar disc prolapse. The study will recruit adults with clinically diagnosed lumbar disc prolapse and associated low-back and/or radiating leg pain who meet the predefined eligibility criteria. Participants will be randomly allocated in a 1:1 ratio to the experimental or control group. The trial will follow a prespecified protocol describing participant recruitment, randomization, treatment delivery, outcome assessment, adherence monitoring, and safety procedures, consistent with recommendations for transparent randomized-trial protocols.
The experimental group will receive H-reflex-guided direction-sensitive exercise. Before treatment, the participant's clinical response to different lumbar movement directions will be assessed together with soleus H-reflex responses. The exercise direction will then be selected according to the direction associated with the most favorable clinical and neurophysiological response. The program may include repeated directional movements, symptom-guided progression, postural correction, functional movement training, and home exercises. Exercise direction, intensity, repetitions, and progression will be individualized and documented for each participant.
The control group will receive a standardized extension-exercise program based on a predefined clinical protocol. Both groups will receive treatment for the same duration and number of sessions and will be provided with standardized advice regarding posture, activity modification, and safe home exercise. Treatment will be delivered by a trained physiotherapist, and adherence will be recorded through attendance logs and home-exercise diaries. Any clinically important worsening of pain, neurological symptoms, or functional status will be documented and managed according to the safety protocol.
Assessments will be completed at baseline, after 8 weeks of treatment, and at the predefined follow-up visit. The primary outcome will be the change in the Oswestry Disability Index score from baseline to 8 weeks. Secondary outcomes will include soleus H-reflex amplitude, H-reflex latency, the H/H ratio, H-reflex recovery following OSP, low-back pain and leg pain measured using the Numeric Pain Rating Scale, straight-leg-raising performance, lumbar range of motion, functional performance, and the Global Rating of Change. Outcomes will be measured using standardized procedures at each assessment time point, and the assessor will be blinded to treatment allocation whenever feasible.
The soleus H-reflex will be assessed using standardized electrophysiological procedures by a trained examiner. H-reflex amplitude, latency, and related recovery measures will be recorded under consistent testing conditions, including standardized participant positioning and stimulation procedures. Clinical outcomes will include patient-reported pain and disability, physical examination findings, lumbar mobility, and a predefined functional-performance test. The exact definition and procedure for "H-reflex recovery in OSP" must be specified in the final protocol before ethical approval and participant recruitment.
The analysis will compare changes between groups over time, with particular emphasis on the group-by-time interaction. The primary analysis will follow the intention-to-treat principle whenever possible. Treatment effects will be reported using between-group mean differences or adjusted mean differences with 95% confidence intervals, together with appropriate standardized effect estimates. Missing data, protocol deviations, adverse events, and treatment adherence will be reported transparently. This approach will allow the study to determine whether an individualized neurophysiological exercise strategy provides additional clinical and functional benefits over standard extension exercise
- Conditions
- Lumber Disc Prolapse
- Being tested
- H-Reflex-Guided Direction-Sensitive Exercise, Standard Lumbar Extension Exercise
- Keywords
- H reflex, disc prolapse
- Medical subject headings
- Intervertebral Disc Displacement
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
H-Reflex-Guided Direction-Sensitive ExerciseOther
H-Reflex-Guided Direction-Sensitive Exercise (H-RGDSE) is an individualized physiotherapy intervention in which the participant's lumbar posture and movement direction are selected according to changes in the soleus H-reflex. The H-reflex is recorded using surface electromyography while the participant is tested in lying, sitting, standing, and different lumbar movement positions. Increased H-reflex amplitude is interpreted as a favorable response suggesting reduced neural compression, whereas a reduced response indicates a position or direction that should be avoided.
Intervention Procedure Baseline assessment: Record pain intensity, neurological findings, range of motion, functional limitations, and baseline soleus H-reflex amplitude on the symptomatic and asymptomatic sides.
H-reflex testing: Measure the soleus H-reflex during unloading and loading positions, including supine or prone lying, sitting, standing, lumbar flexion, extension, side bending, rotation, and relevant combine
Standard Lumbar Extension ExerciseOther
Standard Lumbar Extension Exercise is a standardized physiotherapy program intended to improve lumbar extension mobility, promote upright spinal posture, and strengthen the lumbar extensor muscles. The same exercise sequence is provided to all control-group participants, without using H-reflex findings to select the treatment direction.
Exercise Components Prone lying: Lie face down with the legs relaxed and the pelvis supported comfortably.
Prone-on-elbows extension: Slowly raise the upper trunk onto the elbows while keeping the pelvis and hips in contact with the mat.
Prone press-ups: Place the hands beside the shoulders and gently press the upper body upward while keeping the pelvis relaxed.
Standing lumbar extension: Stand with the feet apart and hands supporting the lower back, then gently lean backward while keeping the knees straight.
Progressive strengthening: Add controlled trunk-extension, hip-extension, and functional upright-posture exercises as tolerated.
| Study group | Role | What they receive |
|---|---|---|
| H-Reflex-Guided Direction-Sensitive Exercise group | Experimental | Participants allocated to the experimental arm will receive H-reflex-guided direction-sensitive exercise for 8 weeks under the supervision of a trained physiotherapist. Before and during the intervention, the participant's clinical response to different lumbar movement directions will be assessed, together with soleus H-reflex responses. The exercise direction will be selected and progressed according to the direction associated with the most favorable reduction in symptoms and/or improvement in the H-reflex response.
The intervention will include individualized repeated lumbar movements, postural correction, symptom-guided exercise progression, functional movement training, and a prescribed home-exercise program. Exercise intensity, repetitions, and progression will be adjusted according to each participant's symptoms, neurological status, functional ability, and tolerance. Participants will receive the same standardized education regarding posture, activity modification, and safe e Receives: Other: H-Reflex-Guided Direction-Sensitive Exercise |
| Standard Lumbar Extension Exercise group | Active comparator | Participants allocated to the control arm will receive a standardized extension-exercise program for 8 weeks under the supervision of a trained physiotherapist. The program will include repeated lumbar extension movements performed in lying and standing positions, postural education, activity-modification advice, and a prescribed home-exercise program.
Exercise intensity and progression will be standardized but adjusted according to each participant's tolerance and clinical status. Participants will receive the same treatment duration, number of sessions, safety instructions, and general educational advice as the experimental group. However, exercise direction in the control arm will not be selected or modified according to H-reflex responses. Treatment attendance, home-exercise adherence, symptoms, and adverse events will be recorded throughout the intervention. Receives: Other: Standard Lumbar Extension Exercise |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in Oswestry Disability Index (ODI) Score
Functional disability related to low back pain will be assessed using the Oswestry Disability Index. The ODI consists of 10 items, each scored from 0 to 5. Item scores will be summed and converted to a percentage using the formula:
ODI (%) = total score ÷ maximum applicable score × 100
The final score ranges from 0% to 100%, with higher scores indicating greater functional disability. If all 10 items are completed, the maximum possible score is 50.
Unit of Measure:
Percentage (%)
Measured: Baseline and immediately after the intervention.
Secondary outcomes (2)
Change in H-Reflex Amplitude Millivolts (mV)
H-reflex amplitude will be measured using surface electromyography after electrical stimulation of the tested peripheral nerve. Amplitude will be calculated as the peak-to-peak voltage difference between the largest negative and positive deflections of the H-reflex waveform.
unit of measurements: Millivolts (mV)
Measured: Baseline and immediately after the intervention.
Change in H-Reflex Latency Milliseconds (ms)
H-reflex latency will be measured from the onset of the electrical stimulus to the first deflection of the H-reflex waveform from the baseline. Multiple traces may be recorded and averaged to improve measurement reliability.
Unit of Measure:
Milliseconds (ms)
Measured: Baseline and immediately after the intervention.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted13 Oct 2026
- Study start5 Oct 2026 (estimated)
- Primary completion5 Oct 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 Lumber Disc ProlapseStudies 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
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind
- Who is masked
- Participant, Outcomes assessor
- Enrolment
- 60 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Delta University for Science and Technology
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Ibrahim Ahmed Ibrahim Abu Ella, Delta University for Science and Technology
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07871422
- Sponsor's protocol ID
- CTS01008442281
- Status last verified
- Oct 2026
- First submitted
- 2 Oct 2026
- Last updated
- 13 Oct 2026
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: confidentiality
Study at a glance
From the registry record, last updated by the sponsor on 13 Oct 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- H-Reflex-Guided Direction-Sensitive Exercise Versus Standard Extension Exercise for Functional Recovery in Patients With Lumbar Disc Prolapse: A Randomized Controlled Trial
- ClinicalTrials.gov ID
- NCT07871422
- Acronym / sponsor ID
- CTS01008442281
- Conditions
- Lumber Disc Prolapse
- Keywords
- H reflex, disc prolapse
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 60 participants (estimated)
- Lead sponsor
- Delta University for Science and TechnologyUniversity, hospital or other
- Study start
- 5 Oct 2026 (estimated)
- Primary completion
- 5 Oct 2026 (estimated)
- Study completion
- 30 Jan 2027 (estimated)
- First posted
- 13 Oct 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 randomized controlled trial will compare H-reflex-guided direction-sensitive exercise with standard extension exercise in patients with lumbar disc prolapse. Participants will be assessed at baseline, after 8 weeks of treatment, and at follow-up. The study will evaluate changes in H-reflex parameters, low-back and leg pain, disability, straight-leg-raising performance, lumbar range of motion, functional performance, perceived recovery, and treatment adherence. The study aims to determine whether individualized exercise based on neurophysiological responses provides greater clinical and functional benefits than standard extension exercise.
Detailed description
This study will be conducted as a two-arm, parallel-group randomized controlled trial to compare H-reflex-guided direction-sensitive exercise with standard extension exercise in patients with lumbar disc prolapse. The study will recruit adults with clinically diagnosed lumbar disc prolapse and associated low-back and/or radiating leg pain who meet the predefined eligibility criteria. Participants will be randomly allocated in a 1:1 ratio to the experimental or control group. The trial will follow a prespecified protocol describing participant recruitment, randomization, treatment delivery, outcome assessment, adherence monitoring, and safety procedures, consistent with recommendations for transparent randomized-trial protocols.
The experimental group will receive H-reflex-guided direction-sensitive exercise. Before treatment, the participant's clinical response to different lumbar movement directions will be assessed together with soleus H-reflex responses. The exercise direction will then be selected according to the direction associated with the most favorable clinical and neurophysiological response. The program may include repeated directional movements, symptom-guided progression, postural correction, functional movement training, and home exercises. Exercise direction, intensity, repetitions, and progression will be individualized and documented for each participant.
The control group will receive a standardized extension-exercise program based on a predefined clinical protocol. Both groups will receive treatment for the same duration and number of sessions and will be provided with standardized advice regarding posture, activity modification, and safe home exercise. Treatment will be delivered by a trained physiotherapist, and adherence will be recorded through attendance logs and home-exercise diaries. Any clinically important worsening of pain, neurological symptoms, or functional status will be documented and managed according to the safety protocol.
Assessments will be completed at baseline, after 8 weeks of treatment, and at the predefined follow-up visit. The primary outcome will be the change in the Oswestry Disability Index score from baseline to 8 weeks. Secondary outcomes will include soleus H-reflex amplitude, H-reflex latency, the H/H ratio, H-reflex recovery following OSP, low-back pain and leg pain measured using the Numeric Pain Rating Scale, straight-leg-raising performance, lumbar range of motion, functional performance, and the Global Rating of Change. Outcomes will be measured using standardized procedures at each assessment time point, and the assessor will be blinded to treatment allocation whenever feasible.
The soleus H-reflex will be assessed using standardized electrophysiological procedures by a trained examiner. H-reflex amplitude, latency, and related recovery measures will be recorded under consistent testing conditions, including standardized participant positioning and stimulation procedures. Clinical outcomes will include patient-reported pain and disability, physical examination findings, lumbar mobility, and a predefined functional-performance test. The exact definition and procedure for "H-reflex recovery in OSP" must be specified in the final protocol before ethical approval and participant recruitment.
The analysis will compare changes between groups over time, with particular emphasis on the group-by-time interaction. The primary analysis will follow the intention-to-treat principle whenever possible. Treatment effects will be reported using between-group mean differences or adjusted mean differences with 95% confidence intervals, together with appropriate standardized effect estimates. Missing data, protocol deviations, adverse events, and treatment adherence will be reported transparently. This approach will allow the study to determine whether an individualized neurophysiological exercise strategy provides additional clinical and functional benefits over standard extension exercise
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind (participant, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| H-Reflex-Guided Direction-Sensitive Exercise group | Experimental | Other: H-Reflex-Guided Direction-Sensitive ExerciseParticipants allocated to the experimental arm will receive H-reflex-guided direction-sensitive exercise for 8 weeks under the supervision of a trained physiotherapist. Before and during the intervention, the participant's clinical response to different lumbar movement directions will be assessed, together with soleus H-reflex responses. The exercise direction will be selected and progressed according to the direction associated with the most favorable reduction in symptoms and/or improvement in the H-reflex response. The intervention will include individualized repeated lumbar movements, postural correction, symptom-guided exercise progression, functional movement training, and a prescribed home-exercise program. Exercise intensity, repetitions, and progression will be adjusted according to each participant's symptoms, neurological status, functional ability, and tolerance. Participants will receive the same standardized education regarding posture, activity modification, and safe e |
| Standard Lumbar Extension Exercise group | Active comparator | Other: Standard Lumbar Extension ExerciseParticipants allocated to the control arm will receive a standardized extension-exercise program for 8 weeks under the supervision of a trained physiotherapist. The program will include repeated lumbar extension movements performed in lying and standing positions, postural education, activity-modification advice, and a prescribed home-exercise program. Exercise intensity and progression will be standardized but adjusted according to each participant's tolerance and clinical status. Participants will receive the same treatment duration, number of sessions, safety instructions, and general educational advice as the experimental group. However, exercise direction in the control arm will not be selected or modified according to H-reflex responses. Treatment attendance, home-exercise adherence, symptoms, and adverse events will be recorded throughout the intervention. |
Who may qualify
- Ages
- 30 to 50 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult
Key inclusion criteria (8 listed)
- Adults aged 30-50 years.
- Clinical diagnosis of lumbar disc prolapse or lumbar disc herniation.
- Presence of low-back pain with unilateral or bilateral radiating leg pain consistent with lumbar radiculopathy.
- Symptoms persisting for at least 4 weeks.
- Pain intensity of at least 3/10 on the Numeric Pain Rating Scale.
Key exclusion criteria (10 listed)
- Previous lumbar spine surgery.
- Spinal fracture, tumor, infection, or inflammatory spinal disease.
- Cauda equina syndrome or progressive/severe neurological deficit.
- Severe or worsening muscle weakness.
- Bilateral symptoms suggesting serious neurological involvement.
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 |
|---|---|---|
| H-Reflex-Guided Direction-Sensitive ExerciseH-Reflex-Guided Direction-Sensitive Exercise (H-RGDSE) is an individualized physiotherapy intervention in which the participant's lumbar posture and movement direction are selected according to changes in the soleus H-reflex. The H-reflex is recorded using surface electromyography while the participant is tested in lying, sitting, standing, and different lumbar movement positions. Increased H-reflex amplitude is interpreted as a favorable response suggesting reduced neural compression, whereas a reduced response indicates a position or direction that should be avoided. Intervention Procedure Baseline assessment: Record pain intensity, neurological findings, range of motion, functional limitations, and baseline soleus H-reflex amplitude on the symptomatic and asymptomatic sides. H-reflex testing: Measure the soleus H-reflex during unloading and loading positions, including supine or prone lying, sitting, standing, lumbar flexion, extension, side bending, rotation, and relevant combine | Other | H-Reflex-Guided Direction-Sensitive Exercise group |
| Standard Lumbar Extension ExerciseStandard Lumbar Extension Exercise is a standardized physiotherapy program intended to improve lumbar extension mobility, promote upright spinal posture, and strengthen the lumbar extensor muscles. The same exercise sequence is provided to all control-group participants, without using H-reflex findings to select the treatment direction. Exercise Components Prone lying: Lie face down with the legs relaxed and the pelvis supported comfortably. Prone-on-elbows extension: Slowly raise the upper trunk onto the elbows while keeping the pelvis and hips in contact with the mat. Prone press-ups: Place the hands beside the shoulders and gently press the upper body upward while keeping the pelvis relaxed. Standing lumbar extension: Stand with the feet apart and hands supporting the lower back, then gently lean backward while keeping the knees straight. Progressive strengthening: Add controlled trunk-extension, hip-extension, and functional upright-posture exercises as tolerated. | Other | Standard Lumbar Extension Exercise group |
Primary outcome
Change in Oswestry Disability Index (ODI) Score
Time frame: Baseline and immediately after the intervention.
Functional disability related to low back pain will be assessed using the Oswestry Disability Index. The ODI consists of 10 items, each scored from 0 to 5. Item scores will be summed and converted to a percentage using the formula: ODI (%) = total score ÷ maximum applicable score × 100 The final score ranges from 0% to 100%, with higher scores indicating greater functional disability. If all 10 items are completed, the maximum possible score is 50. Unit of Measure: Percentage (%)
2 secondary outcomes
Change in H-Reflex Amplitude Millivolts (mV)
Time frame: Baseline and immediately after the intervention.
Change in H-Reflex Latency Milliseconds (ms)
Time frame: Baseline and immediately after the intervention.
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 13 Oct 2026.
- Individual participant dataSharing planned: No. confidentiality
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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?
A study testing H-Reflex-Guided Direction-Sensitive Exercise and Standard Lumbar Extension Exercise in people with Lumber Disc Prolapse, run by Delta University for Science and Technology 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 8 inclusion and 10 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 13 Oct 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 Ibrahim Abu Ella, PhD (0201008442281, ibrahimneuron@gmail.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change in Oswestry Disability Index (ODI) Score (time frame: Baseline and immediately after the intervention.). 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 13 Oct 2026.