| Abstract [eng] |
The paper examined the lower back waist deep and superficial muscle activity while sitting on a stable and uneven surfaces using 3D motion measurement and analysis system QualiSys. In addition, for the calculations used in Microsoft Excel and Matlab software package.The study was conducted with 10 subjects. They did not have any health problems that could have affected the outcome of the investigation. It was examined three right-hand (deep) back muscles has been explored in different postures while sitting on the stable and unstable (in the sagittal and frontal planes) surfaces with different trunk inclination angle from the vertical, trunk posture (straight back and slumped back) and type of legs support: feet rest on the stable basis, hung in the air and rest on the unstable support. In order to investigate and determine the deep lower back muscle and superficial muscles during quiety sitting on the unstable surface depends on the trunk inclination angle from the vertical and trunk posture position. Identify and analyze human movement parameters: muscle activity, bending angles (hip - waist). In this work, as well as ways to describe the study and methodology. The test results indicate that the deep back muscle activity is influenced by all of the factors: seat surface instability, trunk inclination angle and posture and footrests type. Results of measurements were analyzed with regard to basic posture – vertical seat with a straight back (while maintaining a neutral position of the spine) and feet resting on a stable basis. |
