PROCEDIMENTO PER LA MISURAZIONE DELLA FREQUENZA DELLE PULSAZIONI CARDIACHE E STRUMENTO RELATIVO

A method of and apparatus for measuring the heart pulse frequency, especially that of a moving test person for the purpose of a performance test, are disclosed. The mean value of the heart pulse frequency is determined from a measurement of the number of counted pulses of constant frequency which falls within a period of time defined by a predetermined number n of heart pulse periods E whereby the sum of the counted pulses is formed of three terms of a sum, the first term of which corresponds to the sum of the counted pulses within the period of time -1 to n -1, the second term of which corresponds to the negative value of the first term divided by the predetermined number n of heart pulse periods and the third term of which corresponds to the number of counted pulses within the period of time of n-1 to n. Signals detected at the body of a test person are amplified as a function of the peak value of the preceding signal and stored for a short time until the next signal is received. The amplified signals are used to trigger a threshold value switch feeding a monostable multivibrator which aids in eliminating interfering signals.