Cyclic variations of the density dispersion pattern of the spermatozoa population

Spermatozoa were separated into fractions by density on a Percoll column and were used to created a density dispersion pattern by plotting the number of the spermatozoa in the different fractions. This pattern varies daily in every healthy individual. In order to find the sequence of the variations, dispersion patterns of the spermatozoa were prepared during a period of 3 to 11 days following abstinence. The density distribution pattern of the spermatozoa of the normozoospermic donors, after a few days of abstinence was found to be unimodal; the pattern becomes multimodal for the following 2-4 days, after which it returns to its unimodal form for a single day. These variations show a cyclic sequence with individual periodicity (3-5 days). A density dispersion pattern received from healthy donors after 3 days of abstinence is considered "normal" and is presented.