SPEEDOMETRIC, TACHOMETRIC & HZ-METRIC CHROMAXIMETERS & TETANOMETERS WITH IMBEDDED ANALOG SIGNAL RHEOTOMS FOR EXPERIMENTAL BIOMEDICAL PRACTICAL WORKS AND WORKSHOPS

This paper describes a novel type of chronaximetry where the conventional measurements of chronaxy and rheobasis are supplemented by the scaled speedometry indicating the excitation propagation speed along the fiber; scaled frequency measurements using hertzmeter (or mm-1) or tachometry indicating the spatial and temporal regularity of the phenomena. The advanced technology compared to the previous implementations allows to perform comparative analysis and isochronism indication due to the embedded computing unit calculating the percentage ratio between two signals, the 1/Х ratio where the first signal is taken as a unit and the corresponding second signal is taken as X, and the square root for the variability index calculation, related to the square root of time, mathematically identical to the volatility. The interface of the above instrument also includes the substitution of the obsolete equipment for the determination of the influence of the DC current on the irritability of the motor nerves – the Heidenhain´s tetanometer, which has not been used in biomedical practice for a long time. The device prototype has been made using the low-cost element base, hence the construction of a similar DIY device is widely available for anyone who is interested in it. In this connection such a device can be strongly recommended for biological and pharmacobiological experiments, biomedical research and the student´s practice.