Compatibility tests based on biorhythms are 100% accurate. Unlike human revelations that can only make half-truths, these tests are based on ancient systems of planetary influences and numerology. So yes, evidence of real biological rhythms was found in humans. And yes, other creatures have their rhythms, with birds migrating at certain times of the year, cicadas following cycles of 13 and 17 years, and so on.
In the 1960s, 70s and 80s, biorhythms had gained more popularity. From books to biorhythm calculators, many people had prescribed the idea. Articles on biorhythms are found in scientific journals, but most studies (99 out of 13) indicate that biorhythms are not valid and that they are not better at predicting than chance. A 1978 New York Times story said that managers of several Major League Baseball teams adjusted pitch rotations according to biorhythms and that five NFL teams used them to explore opponents.
Both the theoretical basis and the practical scientific verification of the theory of biorhythm are lacking. In 1986, Haim Saban tried to turn a Japanese program into a new children's program called Bio-Man, about five children with identical biorhythms defending the Earth. In the early 1900s, a professor named Hermann Swoboda claimed to have created cycles of biorhythms independently. It turns out that this little device explains the biorhythms of a person, which in turn explain everything, especially sports.
The idea of biorhythms first appeared in the late 19th century when a doctor named Wilhelm Fliess came up with the idea that women ran on a 28-day cycle and men on a 23-day cycle. The first team to exploit computer scouting, the Dallas Cowboys, was also the club that invested the most in biorhythms. Only after dropping the angle of biorhythms would it eventually reach the airwaves like Mighty Morphin's Power Rangers. However, unlike biorhythms, which are claimed to have precise and unalterable periods, circadian rhythms are found observing the cycle itself and periods are found to vary in length depending on biological and environmental factors.
The rise and fall of biorhythms is a reminder not only that the 1970s were truly strange, but also that some of the easiest brands are at the forefront. Without them, biorhythms became another pseudoscientific statement that people are willing to accept without the required evidence. Soon after, Swiss biorhythm expert George Thommen warned that Gable would soon face a double critical day, and that his health was in danger. In the early 1900s, a professor named Hermann Swoboda claimed to have independently devised biorhythms, and then another professor named Alfred Teltscher noticed that students' academic success was executed in 33-day cycles.
A 1978 study on the incidence of industrial accidents found no empirical or theoretical support for the biorhythm model. The 23-day and 28-day rhythms used by biorhythmists were first devised in the late 19th century by Wilhelm Fliess, a Berlin doctor and friend of Sigmund Freud.