Orthostatic Tolerance During FES (Functional Electrical Stimulation)-Walking in Paraplegia
Recruitment status was Recruiting
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Purpose
Objective:
The objective of this research is to undertake a safety and viability study of FES-evoked stepping in individuals with paraplegia. The rationale for this objective is based upon the need to clarify whether physiological limitations, especially orthostatic intolerance, limit functional mobility outcomes. The cardiovascular, autonomic, and muscle metabolic factors governing orthostatic tolerance during skin-surface FES stepping will be investigated, since this functional task forms the basis of upright mobility and engenders strong physiological challenges upon key regulatory processes in the SCI (spinal cord injury) patient.
Specific Hypotheses:
i. Reduction of blood pressure will be greater during FES-evoked stepping than during passive stepping; ii. Reduction of blood pressure will be greater during FES-evoked stepping with no upper body component versus FES-stepping with an upper body component; iii. Blood pressure will be reduced even further during FES-evoked stepping following a 6-week progressive-intensity gait training intervention.
| Condition | Intervention | Phase |
|---|---|---|
|
Spinal Cord Injury |
Procedure: FES-evoked functional upright gait |
Phase 1 |
| Study Type: | Interventional |
| Study Design: | Allocation: Non-Randomized Endpoint Classification: Safety/Efficacy Study Intervention Model: Single Group Assignment Masking: Open Label Primary Purpose: Treatment |
| Official Title: | Orthostatic Tolerance During FES-Evoked Stepping in Paraplegia: A Safety and Viability Study |
- Change of systolic blood pressure during three FES-evoked stepping conditions
- Cardiovascular and Metabolic Responses
- Autonomic Responses
- Muscle Metabolic Responses
- Humoral Responses
- Syncope Symptom Score
| Estimated Enrollment: | 10 |
| Study Start Date: | March 2004 |
| Estimated Study Completion Date: | December 2006 |
Aims:
The primary aim of the safety and viability study is to assess changes in blood pressure during up to 60-min of FES-evoked stepping versus up to 60-min of stepping.
A secondary aim is to investigate changes in blood pressure during FES-assisted stepping with and without a voluntary upper-limb component of gait.
Specific Hypotheses:
i. Reduction of blood pressure will be greater during FES-evoked stepping than during passive stepping; ii. Reduction of blood pressure will be greater during FES-evoked stepping with no upper body component versus FES-stepping with an upper body component; iii. Blood pressure will be reduced even further during FES-evoked stepping following a 6-week progressive-intensity gait training intervention.
Primary Outcome: The primary outcome measure for this study is the change of systolic blood pressure during three FES-evoked stepping conditions, as described below. Each condition is defined as up to 60-min of continuous gait.
Secondary Outcomes: Secondary outcomes include a change of diastolic blood pressure and the duration of orthostatic tolerance. Orthostatic tolerance will be assessed as the time that the subject can perform stepping before the onset of orthostatic hypotension. The duration of orthostatic tolerance will be determined by the time at which one of the following occur: (i) 60 continuous minutes of stepping; or (ii) orthostatic hypotension, defined as a reduction in systolic blood pressure of > 20 mmHg or diastolic blood pressure of >10 mmHg; or (iii) signs and symptoms of pre-syncope; or (iii) upon subject request. Throughout each trial, heart rate and blood pressure will be monitored continuously. In addition to the primary and secondary outcome variables, several additional measurements that may contribute to orthostatic tolerance, or indeed, intolerance, will be assessed at 10-min intervals during stepping.
Eligibility| Ages Eligible for Study: | 18 Years to 55 Years |
| Genders Eligible for Study: | Male |
| Accepts Healthy Volunteers: | No |
Inclusion Criteria:
- Male
- A spinal cord lesion, of traumatic etiology, between the 6th and 11th thoracic spinal segments
- Sensory and motor complete lesion (ASIA [American Spinal Injury Association]-A)
- At least 2 years post injury
- Between 18-55 years of age
- Responsive to electrical stimulation
Exclusion Criteria:
- Severe osteoporosis, fractures, dislocations (as determined by X-ray and DEXA)
- Upper limb or shoulder pathologies
- Severe spasticity (≥4 on Ashworth scale)
- Contractures
- Currently undertaking FES or gait training
Contacts and Locations| Australia, New South Wales | |
| Rehabilitation Research Centre, University of Sydney | Recruiting |
| Sydney, New South Wales, Australia, 2141 | |
| Contact: Glen M Davis, PhD, FACSM +61 2 9351 9466 g.davis@fhs.usyd.edu.au | |
| Principal Investigator: Glen M Davis, PhD | |
| Sub-Investigator: Jack Crosbie, PhD | |
| Sub-Investigator: James W Middleton, PhD | |
| Sub-Investigator: Jacquelene Raymond, PhD | |
| Principal Investigator: | Glen M Davis, PhD, FACSM | University of Sydney |
More Information
No publications provided
| ClinicalTrials.gov Identifier: | NCT00108043 History of Changes |
| Other Study ID Numbers: | NHMRC 302013 |
| Study First Received: | April 12, 2005 |
| Last Updated: | July 11, 2006 |
| Health Authority: | Australia: Department of Health and Ageing Therapeutic Goods Administration |
Keywords provided by University of Sydney:
|
Functional Electrical Stimulation Gait Blood pressure |
Orthostatic Hypotension Cardiovascular responses Near-infra red spectroscopy |
Additional relevant MeSH terms:
|
Paraplegia Spinal Cord Injuries Paralysis Neurologic Manifestations Nervous System Diseases |
Signs and Symptoms Spinal Cord Diseases Central Nervous System Diseases Trauma, Nervous System Wounds and Injuries |
ClinicalTrials.gov processed this record on May 16, 2013