iCycle II: Recovery of Function Through FES Cycling With VR Biofeedback in People With SCI.

Recovery of Function Through Cycling Therapy With Virtual Reality Biofeedback in Chronically Spinal Cord-injured People

The annual incidence of traumatic spinal cord injury (SCI) is estimated at 2,500 (35 per week) in the UK and, due to advances in research and clinical management, the majority now have incomplete injuries, with significant potential for neurological improvement. Discovering ways to provide intensive, but cost-effective SCI rehabilitation is therefore increasingly important.

The iCycle combines functional electrical stimulation (FES) cycling with VR cycle-racing feedback, where winning correlates with voluntary effort, to promote recovery. The aim is to improve walking in people with incomplete injuries, fundamental to independence and quality of life as well as long-term health. More intensive rehabilitative training is associated with better outcomes: the iCycle has the potential to increase intensity of exercise without additional demands on therapists' time and therefore cost.

Following the encouraging results in an initial study; it is now important to find out whether recovery will continue at a similar rate if iCycle training continues beyond 4 weeks. Six volunteers with SCI will be recruited to participate in this 20 week, single-site open feasibility trial. The trial consists of an intervention phase lasting up to 12 weeks (3 iCycle sessions per week), and an 8-week follow-up phase. Outcome measures (ISNC-SCI motor scoring, Trunk Impairment scale, Walking Index for Spinal Cord Injury, 6-minute walk test, Goal Attainment Scale and TMS) will be taken every 4 weeks. The 12-week intervention phase will be separated into three 4-week blocks; at the end of each block participants may decide whether or not they wish to continue training.

Recruitment:

Participants will be recruited from London Spinal Cord injuries Centre (LSCIC) at the Royal National Orthopaedic Hospital (RNOH) where the training intervention will be carried out. The study will also be advertised via relevant newsletters, bulletin boards, websites and mailing lists.

For each recruited participant, the study will be conducted for up to 20 weeks in total*. This includes: an intervention phase lasting up to 12 weeks and an 8-week follow-up phase. Outcome measure (OM) assessments will be carried out every 4 weeks (OM1-6) to collect study variables. OM assessments will be conducted by either the researcher or physiotherapist. Each OM assessment session will be broken into two parts, each lasting 2 hours.

* At the end of each 4-week block in the intervention phase, participants will be given the option to continue training for the next 4-week block, or to stop training.

Intervention Phase:

Visit 1: During first outcome measure visit (OM1), participants will attend the Aspire Create labs at the RNOH in Stanmore, where they will be given the opportunity to ask questions about the study, informed consent to participate in the study will be taken and demographic information recorded in the Case Report Form (CRF).

Visits 2-38; 36 training sessions (3days/week) & 3 sessions Outcome measure assessments (OM 2-4) During the intervention phase, participants will attend 3 training sessions per week for up to 12 weeks (participants may opt to withdraw from training after 4 or 8 weeks and, if they choose to withdraw, will be advanced to the follow-up phase); each session will last from 20 mins-1 hour depending on the maximum achievable endurance (plus an additional <30 mins for set-up in iCycle). Stimulation parameters will be recorded for each participant before training starts and a training diary will be completed during each training session.

During each training session

1. Electrodes will be placed on the quadriceps, hamstring and gluteal muscles.
2. Participants will be able to tether their wheelchair (from under the seat) to the front of the iCycle for security and hold the handlebars provided on the dashboard while cycling for further stability. These can be adjusted for comfort.
3. Muscle stimulation (FES) will be applied to the leg muscles on alternative revolutions of the pedals during a virtual reality cycle race(s). The more voluntary effort the greater the speed of the avatar.
4. Training will increase from 20 mins or the maximum achievable at the start (whichever is lower) up to at least 1 hour.

Outcome measures (OM 2-4) will be performed every 4 weeks during the intervention phase (on a separate day to training sessions). The same outcome measures conducted in the baseline phase are repeated here with the addition of an audio recorded interview conducted in the OM4 appointment.

Follow-up Phase:

Visits 39-40 - 2 sessions Outcome measures (OM 5-6) Following termination of training, no further intervention will be given. Outcome measure assessments (OM 5-6) will be performed every 4 weeks during the 8-week follow-up phase.

Inclusion Criteria:

• >18 years
• Incomplete SCI above T12
• >12 months post injury
• Respond to FES
• No deteriorating condition or other co-morbidity that would make participation impractical or unsafe.
• Marginal walker defined as able to rise from a chair, stand for 10 seconds and walk >10 steps without human help (but may use an aid including parallel bars).

Exclusion Criteria:

• Cardiac pacemaker
• Pressure sores/skin problems
• Unhealed lower limb fractures
• Pregnancy
• Active heterotrophic ossification - lower limbs
• Severe osteoporosis
• Complex regional pain syndrome
• Implanted metal work at electrode site (< 3/12)
• Lower Limb Malignancy
• T6 and below spinal malignancy
• Uncontrolled autonomic dysreflexia
• History of knee dislocation/subluxation
• Allergy to electrodes
• Cognitive difficulties - must be able to demonstrate an understanding of the iCycle and the virtual reality cycling game
• Severe spasticity - Ashworth scale 4 or 5 in any lower limb muscle groups
• Neurological degenerative diseases