Soleus H-Reflex in Different Sitting Postures

Completed

• Conditions: Compression of Spinal Nerve Root; Spinal Disorder; Low Back Pain
• Interventions: Other: Sitting posture

• Registration Number: NCT01744899
• Lead Sponsor: Texas Woman's University

Brief Summary

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.

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 Timeline

• Study Start: 2012-01
• Primary Completion: 2012-05
• Study Completion: 2012-05
• Study First Submitted: 2012-09-26
• Status Verified: 2012-12
• Study First Submitted QC: 2012-12-05
• Last Update Submitted: 2012-12-05
• Study First Posted: 2012-12-07
• Last Update Posted: 2012-12-07

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 30

Inclusion Criteria

• Able to read, speak, and understand English

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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.

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Prolonged sitting	Sitting posture	Includes individuals who spent an average of at least 6 hours a day sitting over the past year.
Control	Sitting posture	Includes individuals who spent 4 hours or less/day sitting over the past year.

Primary Outcome Measures

Name	Time	Method
Lumbosacral nerve root function by as measured by the soleus H-reflex amplitude	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

Name	Time	Method
Pressure under the ischial tuberosities	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.

Trial Locations

Locations (1)

Texas Woman's University; 🇺🇸 Houston, Texas, United States