Objective：An inertial sensor-based motion capture system for rehabilitation therapy is feasible due to its simple measurement methods. However, a standard value must be used to evaluate or diagnose pathological gait kinematically. This study aimed to set a standard value by determining the averaged spatial-temporal parameter (STP) and range of motion (ROM) during gait in healthy participants.

Methods：This study included 177 healthy individuals, who were grouped into six groups according to gender (male and female) and age (young, middle, and old). All participants walked under two speed conditions (NORMAL or FAST) and the gait was captured with an inertial sensor-based motion capture system. Eight types of STP and fourteen types of ROM were calculated.

Results：Of the 132 variables (22 variables × 2 sexes × 3 ages), 123 variables for NORMAL and 112 variables for FAST followed the normal distribution. A main effect of age on walking velocity for FAST was noted but not for NORMAL. The middle and old ages depended on an increased cadence for maintaining walking velocity. Ankle and hip ROMs in the old were smaller than that in the young, and these differences were demonstrated more so during the FAST condition. There were gender differences in hip ROMs (men had greater internal-external rotation and women had greater flexion-extension).

Conclusion：The standard value can be determined from variables in gait assessment, for young to elderly, and gender-specific.

Anti-signal recognition particle myositis (ASRPM) is a steroid-resistant disease that develops in approximately 5-8％ of patients with dermatomyositis, polymyositis, or other types of myositis. It restricts the patient's activities of daily life (ADLs), mainly owing to muscle weakness of the trunk and proximal lower extremities. We report a case of ASRPM treated at a Kaifukuki rehabilitation ward (KRW；a type of inpatient rehabilitation ward in Japan). A female ASRPM patient in her eighties underwent treatment at the KRW twice, with an interval of 18 months between treatments. During each hospital stay, concentrative and graded exercise therapy was performed under continuous administration of steroid and tacrolimus hydrate. The severity of ASRPM was evaluated using periodic measurement of creatinine kinase (CK) levels. After each KRW treatment, the patient gained the ability to walk and perform instrumental ADLs to live alone. The details of exercise therapy for ASRPM and the management of ASRPM and steroid-induced osteoporosis and its complications (for e.g., lumbar compression fracture) are also discussed.