Analysis of the Course of Displacements of the Center of Mass While Using a Chair with a Spherical Base

BACKGROUND: An increase in the occurrence of spine problems has resulted in the necessity to analyze the activities which have the highest impact on the condition of the motor organ. One of such activities is sitting, which takes up approximately 44% of our day. OBJECTIVE: The aim of the study is to determine course of displacements of the BCoM (center of body mass), the HCoM (center of head mass) and the PCoM (center of pelvis mass) while using a chair with a spherical base and normal chair. METHODS: A group of 8 men participated in the tests. Each of the people declared that they had not suffered from any conditions related to the motion system nor from any balance disorders. RESULTS: On the basis of body kinematics tests with the use of a motion capture system, the following parameters have been determined: the course of BCoM, the course of displacements of the HCoM, and the course of displacement of the PCoM. CONCLUSIONS: The results depict an increase in the displacements of the HCoM in relation to the PCoM while using chairs of spherical base. There is also an increase of displacements in the BCoM.