The Influence of Hypo Kinesis and Frequency Strain of a Car Ride on Mechanical Functions of Axial System Changes
Abstrakt
In our measurements, we used TVS method to detect mechanical changes of axial system. These mechanical changes can be base for discomfort feeling during monotonous driving in the car.
The TVS method is based on the use of consequent application of continuously changing harmonic stimuli, which periodically differ between 5Hz and 160Hz, to the vertebrae C7 and L5. This wave is carried through the axial system and its acceleration on the spinous processes between C7 and S1 is scanned with the help of accelerometric sensors.
According to the measured data, it is possible to identify changes of the mechanical properties of the human spine before and after applying hypo kinesis and frequency loading by the car ride. The research results proved the fact, that the TVS method is suitable for detection of the mechanical changes of axial system.
It was also proved that changes caused by a monotonic and frequency loading influence he way of waves transfer through the axial system of the observed participants. From our data results, that we can compare the subjects more intraindividual than interindividual.
We found out that healthy and flexible spine oscillates like elastic bar. It is able to absorb more mechanical energy with higher elasticity and the spinal joints are more flexible.
The resonant frequency of the healthy and flexible spine lies between 40 and 60 Hz or higher. In most of the cases we found higher damping and lower transmission of the vibrations after the loading.
By some of the subjects we can find different reaction in thoracic and lumbar spine to the loading.