Soleus H-Reflex in Different Sitting Postures

December 5, 2012 updated by: Hamad Al Amer, Texas Woman's University

The Influence of Different Sitting Postures on Soleus H-Reflex in Normal Subjects

The purpose of this study was to examine the effect of prolonged sitting duration and three different sitting postures (erect, slumped, and slouched sitting postures) on spinal nerve root function by measuring the soleus (SOL) H-reflex amplitude. In addition, the pressure under the ischial tuberosities during the three sitting postures were assessed and correlated with the SOL H-reflex amplitude.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Participants were assigned to two groups (prolonged sitting group and controls) based on their daily sitting duration with 15 participants in each group. The outcome measures were recorded during erect, slumped and slouched sitting postures. The differences between the two groups and the three sitting postures in the outcome measures were examined for statistical significance.

Study Type

Observational

Enrollment (Actual)

30

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Texas
      • Houston, Texas, United States, 77030
        • Texas Woman's University

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 50 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Healthy adults from both genders.

Description

Inclusion Criteria:

  • Able to read, speak, and understand English

Exclusion Criteria:

  1. Current complaint of low back pain.
  2. Current injury to the ankle and/or foot.
  3. Limited ankle movement.
  4. Leg length discrepancy.
  5. Scoliosis.

  6. History of:

    • Back surgery.
    • Calf muscle injury/surgery.
    • Radicular symptoms.
    • Peripheral neuropathy.
    • Upper motor neuron lesion.
    • Systemic and metabolic diseases.
    • Cancer.
  7. Pregnant at the time of the study.
  8. Use of pain medications at the time of the study.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Prolonged sitting
Includes individuals who spent an average of at least 6 hours a day sitting over the past year.
Other: Sitting posture
The outcomes were measured while the participants assumed erect, slumped and slouched sitting postures.
Control
Includes individuals who spent 4 hours or less/day sitting over the past year.
Other: Sitting posture
The outcomes were measured while the participants assumed erect, slumped and slouched sitting postures.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Lumbosacral nerve root function by as measured by the soleus H-reflex amplitude
Time Frame: The outcome was measured during one session that lasted for an average of 3 hours. No further measurement was performed after that session.
The outcome was measured during one session that lasted for an average of 3 hours. No further measurement was performed after that session.

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Pressure under the ischial tuberosities
Time Frame: The outcome was measured during one session that lasted for an average of 3 hours. No further measurement was performed after that session.
Pressure under the ischial tuberosities was measured in millimeter of mercury (mmHg), with 0 mmHg representing no ischial pressure and 644 mmHg representing the highest pressure.
The outcome was measured during one session that lasted for an average of 3 hours. No further measurement was performed after that session.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Texas Woman's University

Collaborators

The Saudi Arabian Cultural Mission to the United States

Investigators

  • Principal Investigator: Hamad S Al Amer, MS, Texas Woman's University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 2012

Primary Completion (Actual)

May 1, 2012

Study Completion (Actual)

May 1, 2012

Study Registration Dates

First Submitted

September 26, 2012

First Submitted That Met QC Criteria

December 5, 2012

First Posted (Estimate)

December 7, 2012

Study Record Updates

Last Update Posted (Estimate)

December 7, 2012

Last Update Submitted That Met QC Criteria

December 5, 2012

Last Verified

December 1, 2012

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 16518

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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