[Changes in the frequency spectrum of the heart rhythm under static muscular effort]

Certain results are gives which show that the frequency spectrum of the heart rhythm during the fulfillment of static muscle effort to refusal, distinguishes significantly the way in which this test is performed by experienced persons: at complete motivation (physiological refusal) and in incomplete motivation (psychological refusal). The second type of answer is unwanted in practical application of the test in industry, that's why a conclusion is made, that the frequency spectrum of the heart rhythm could serve as criterium of correctness for putting the test into practice.