New Technology for Individualised, Intensive Training of Gait After Stroke- Study II (HAL-RCT-II)

New Technology for Individualised, Intensive Training of Gait After Stroke- Phase II Trials, Study II

The overall purpose of this project is to establish the added value of training with the Hybrid Assistive Limb (HAL) exoskeleton system as part of regular rehabilitation intervention programs after stroke. The main specific aims are: (i) to compare potential effects on functioning and disability of gait and mobility training long-term after stroke by comparing A) HAL-training combined with conventional rehabilitation interventions to B) conventional rehabilitation interventions without HAL and to C) no intervention.

The effectiveness of the interventions will be assessed in terms aspects of body function, walking ability and endurance as well as level of activity in daily living and participation assessed at the end of intervention and at a 6 and 12 months follow-up. Intensive gait training with HAL is performed 1 session/day, 3 days/week for 6 weeks and each session will not exceed 60 min of effective walking time with HAL. In addition, each session will include conventional gait training that will not exceed 30 min effective training time. To standardize the training procedure, training with HAL is performed on a treadmill and to enable body weight support. Body weight support is used to prevent falls and to unburden the weight of the suit (9 kg). The training program is performed by physiotherapists, trained in the HAL method and the study procedures. At the end of the 6 weeks, the physiotherapist that has been engaged in the patient's conventional training will perform 1-2 home visits to inform/educate the patient and those who are providing assistance to the patient in how the patient can make use of any gains in gait function during activities of daily living. The 1st control group will receive conventional gait training performed 1 session/day, 3 days/week for 6 weeks that will not exceed 1h 30 min effective training time. The 2nd control group will not receive an intervention. The conventional gait training is performed according to current best evidence based practice and may include over ground walking with assistance and/or assistant devices as well as the use of a treadmill and body weight support and training of gait function in activities of daily living

Intensive gait training with Hybrid Assistive Limb (HAL) is performed 1 session/day, 3 days/week for 6 weeks and each session will not exceed 60 min of effective walking time with HAL. In addition, each session will include conventional gait training that will not exceed 30 min effective training time.

Conventional gait training performed 1 session/day, 3 days/week for 6 weeks that will not exceed 1h 30 min effective training time.

Assessment at baseline, after 3 weeks of intervention, after 6 weeks of intervention, 6 and 12 month post intervention

Objectively quantify the impairment caused by a stroke, using the National Institutes of Health Stroke Scale (NIHSS)

Inclusion Criteria: 1-10 years since stroke onset Able to walk but not independently, i.e. need of manual support or close supervision due to lower extremity paresis, FAC score 2-3 or FAC 4 combined with gait speed <0.8m/s according to 10 meter walk test, which corresponds to limitations in community ambulation (Bowden et al 2008) Ability to understand training instructions as well as written and oral study information and to express informed consent or by proxy Body size compatible with the HAL suit. Exclusion Criteria: Contracture restricting gait movements at any lower limb joint Cardiovascular or other somatic condition incompatible with intensive gait training Severe, contagious infections (e.g. Methicillin Resistant Staphylococcus Aureus (MRSA) or Extended Spectrum Beta Lactamase bacteria).

Nilsson A, Vreede KS, Haglund V, Kawamoto H, Sankai Y, Borg J. Gait training early after stroke with a new exoskeleton--the hybrid assistive limb: a study of safety and feasibility. J Neuroeng Rehabil. 2014 Jun 2;11:92. doi: 10.1186/1743-0003-11-92.

Wall A, Borg J, Palmcrantz S. Clinical application of the Hybrid Assistive Limb (HAL) for gait training-a systematic review. Front Syst Neurosci. 2015 Mar 25;9:48. doi: 10.3389/fnsys.2015.00048. eCollection 2015.

Palmcrantz S, Wall A, Vreede KS, Lindberg P, Danielsson A, Sunnerhagen KS, Hager CK, Borg J. Impact of Intensive Gait Training With and Without Electromechanical Assistance in the Chronic Phase After Stroke-A Multi-Arm Randomized Controlled Trial With a 6 and 12 Months Follow Up. Front Neurosci. 2021 Apr 22;15:660726. doi: 10.3389/fnins.2021.660726. eCollection 2021.