The purpose of this study was to investigate the effects of the new wearable hip assist robot developed by Samsung Advanced Institute of Technology (Samsung Electronics Co, Ltd., Korea) to gait rehabilitation in elderly adults and stroke patients.

Randomized, two treatment groups

Number of Subjects : 54 subjects (n=27 per group)

Group 1 : gait rehabilitation with hip assist robot / 10 sessions (5sessions - treadmill gait training / 5sessions - overground gait training), 30min per session

Group 2 : gait rehabilitation without hip assist robot / 10 sessions (5sessions - treadmill gait training / 5sessions - overground gait training), 30min per session

Primary objective is to demonstrate the effects of hip assist robot on spatio-temporal parameters measured by motion capture system (Motion Analysis Corporation, Santa Rosa, CA, USA), muscle activation patterns measured by surface electromyography (sEMG) (Noraxon Inc., Scottsdale, AZ, USA), metabolic energy cost parameters measured by portable cardiopulmonary metabolic system (Cosmed K4B2, Rome, Italy) and foot pressure distribution measured by F-Scan Mobile system (Tekscan Inc., South Boston, MA, USA).

Secondary objective is to demonstrate the effects of hip assist robot on motor function improvement evaluated by Berg Balance Scale (BBS), Tinetti performance oriented mobility assessment (POMA), Korean version Modified Bathel index (K-MBI), Modified Rankin Scale (MRS), Functional Ambulation Classification (FAC), Fugl-Meyer assessment for lower extremity (FMA), Korean version Fall Efficacy Scale (K-FES), Manual Muscle Test (MMT) and Range of Motion (ROM).

Inclusion Criteria:

• Elderly adults

  1. Age: between 65 and 84 years
  2. elderly adults who had no neurological or musculoskeletal abnormalities affecting gait
  3. Ability to walk at least 10m regardless of assist devices
  4. High levels of physical performance (SPPB > 7)
  5. Subject is willing to be randomized to the control group or the treatment group

• Stroke

  1. Age: between 50 and 84 years
  2. ≥ 3 months post stroke
  3. Ability to walk at least 10m regardless of assist devices
  4. Adequate gait function (FAC > 3)
  5. Physician approval for patient participation
  6. Subject is willing to be randomized to the control group or the treatment group

Exclusion Criteria:

• Elderly adults

  1. History of any diseases (eg. lower extremity orthopedic diseases, neurologic disorders, cardiovascular disease, heart failure, uncontrolled hypertension that affect walking capacity, efficiency, and endurance)
  2. Severe visual impairment or dizziness that increases the risk of falls

• Stroke

  1. Serious cardiac conditions (hospitalization for myocardial infarction or heart surgery within 3 months, history of congestive heart failure, documented serious and unstable cardiac arrhythmias, hypertrophic cardiomyopathy, severe aortic stenosis, angina or dyspnea at rest or during activities of daily living)
  2. Advanced liver, kidney, cardiac, or pulmonary disease
  3. History of concussion in last 6 months
  4. History of unexplained, recurring headaches, epilepsy/seizures/skull fractures or skull deficits
  5. Preexisting neurological disorders such as Parkinson's disease, Amyotrophic Lateral Sclerosis (ALS), Multiple Sclerosis (MS), dementia