The best way to assess human kinematics is by capturing movements in three dimensions, which is commonly done using an optoelectronic measurement system. However, due to equipment or logistical limitations, only two-dimensional kinematic assessment is performed in practical biomechanics classes in undergraduate and graduate courses. For this reason, practical demonstrations in the classroom by biomechanics professors are limited, especially in universities that do not have access to an optoelectronic measurement system. A program that allows three-dimensional kinematics assessment demonstrations using only a simple camera can be a great improvement in the teaching process.

To develop a program to facilitate the practical teaching of kinematics in classrooms.

A script was prepared in Python using MediaPipe (pose estimation), Matplotlib (three-dimensional graphs), OpenCV (computer vision), NumPy (angle calculations), and Streamlit (data visualization). Using only a cellphone or a webcam with a notebook, the program captures video frames and uses them for kinematic analysis. The main functionality is provided by MediaPipe, a library capable of recognizing a human body in an image or video and detecting 33 three-dimensional landmarks. The script has two modes: live and recorded video. Live mode uses a live camera to capture video frames, recognize the human body, and apply the landmarks, allowing real-time visualization of the body in a three-dimensional perspective. Recorded mode performs the same process but uses pre-recorded videos. The program outputs a video feed (either from a camera or a recorded video) with landmarks overlaid on the body and an X-Y-Z graph representing the body's three-dimensional structure, displayed side by side. Additionally, the program shows joint angles in degrees and angular velocity. A feature to track the linear displacement of a specific joint was included in the X-Y-Z graph.

The program can capture video frames in real time to provide students with a three-dimensional representation of the human body using 33 landmarks. Professors can also use pre-recorded videos to demonstrate three-dimensional kinematic analysis. In both modes, the program allows the visualization of linear and angular segment displacement.

A prototype of a MediaPipe-based program to assist biomechanics professors in practical kinematics classes. The program used only a camera and a laptop, which are commonly used in classes. Future research could explore the use of this type of program in teaching kinematic concepts.

This study presents a program prototype to improve the tools available for teaching biomechanics to undergraduate and graduate students, which can be used in classrooms.