Abstract
Studies have shown that stair exercises can enhance the strength of lower limbs for patients with limb disorders. However, there are only few systems that can monitor the lower limb exercises in the medical institutes. To analyze the lower limb exercises instantaneously, we propose a smart single-sensor wearable device, S3-Sock, equipped on shoes. The sock can monitor and measure the stride count, step height, and the distance of step trajectory about lower limb exercises. The experimental results demonstrate that the proposed system is reliable under different lower limb exercises. The averages of absolute mean errors of stride count in stair-climbing and walking are about 2.00% and 0.88%, respectively. The averages of absolute mean errors of step height are about 5.12% and 8.23% in step-by-step and step-over-step stair climbing, respectively.