Gait analysis can analyze and diagnose abnormal motor behavior, and is more used in clinical medical direction. Including orthopedics, ** department and other hospital related departments for patient diagnosis, as well as sports human science, ** medicine, psychology and other related majors of colleges and universities for research and analysis. 
There are five main types of disorders that cause movement abnormalities: deformities, muscle weakness, sensory loss, pain, and impaired motor control. There are many causes of these conditions, such as joint contractures and congenital clubfoot. The monitoring and quantitative recording of abnormal gait movement behaviors for these diseases is of great significance for confirming the specific situation of patients and the formulation of the best methods.
The 3D gait analysis system includes a series of advanced equipment such as infrared optical motion capture system, surface electromyography, force plate, wearable metabolic monitoring system, etc., which can accurately obtain a series of physical behavior parameters of subjects, which is of great significance in the field of gait analysis. 
According to the principle of biomechanics, the three-dimensional gait analysis system detects and records the trunk and joint movements, muscle activities, forces on the ground, joint moment and work during human walking, as well as the plantar pressure distribution and oxygen consumption during walking, and compares with the normal reference value range to determine the abnormal key imaging factors and compensatory changes, so as to provide suggestions and references for clinical diagnosis, clinical decision-making and effect evaluation. The core device that measures the patient's gait realizes non-invasive, continuous dynamic measurement by monitoring and tracking the position of specific reflective marking points on the target for continuous real-time feedback, so as to complete the motion capture task in gait analysis and obtain kinematic data. 
Add ** annotation, no more than 140 words (optional) NOKOV metric motion capture system for the field of gait analysis, according to the relevant project experience has a special reflective marker point sticking model, to ensure the optimization of the capture effect.
Add ** annotations, no more than 140 words (optional) The acquired kinematic data mainly includes motion position, velocity, acceleration, reaction time, distance, flexion-extension, adduction-abduction, rotation, cadence, step length, pace, and user-defined angle.
In this stage, the limb bearer will produce significant forces in three directions on the ground, that is, vertical, anterior, anterior, and external, and when the body changes its position through the lower limbs on the supporting side, the magnitude and direction of these forces will change. 
Add ** annotations, no more than 140 words (optional) and the 3D force plate can effectively obtain the ground reaction force, moment and power data at this stage, and the analysis of these data can help to understand the mechanism of gait and obtain accurate mechanical parameters of abnormal gait.
The surface electromyography analysis system determines the cycle and relative strength of muscle function by obtaining the electrical signals of muscles, and judges the gait abnormalities caused by the changes in muscle activity time course and exercise intensity, which is conducive to making more accurate judgments on the causes of gait abnormalities. 
Add ** annotation, no more than 140 words (optional) In addition to the above three devices, some gait labs are equipped with plantar pressure distribution and exercise cardiopulmonary testers to provide more comprehensive information for gait analysis.
Add ** annotation, no more than 140 words (optional) Combined with the 3D gait analysis system of motion capture system, 3D force plate and other equipment, conduct gait analysis, maximal breath measurement, scoliosis measurement and other studies of cerebral palsy patients.
Through the gait analysis room built by combining motion capture system, three-dimensional force plate, surface electromyography, plantar pressure distribution, etc., he has considerable clinical experience in the study of children's gait analysis. In addition, in Tianjin Medical University, South China University of Technology, Peking University and other universities, it is also equipped with a three-dimensional gait analysis system based on motion capture system to carry out research related to gait analysis such as prosthetic design and development and gait of the elderly.