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Biorhythms

The science of Biorhythms was attributed to the famous psychiatrist Sigmund Freud, and in particular his associates Dr Wilhelm Fliess and psychologist Dr Hermann Swoboda. They hypothesised that based on our birth date, Biorhythms may determine the highs and lows of our life. The Biorhythms comprise of three cycles: a 23 day physical cycle, a 28 day emotional cycle and a 33 day intellectual cycle.

Cycle Calculation

Two parameters are required to calculate the three cycles: your birth date and the date on which to start calculations. Each cycle is calculated as a sine wave using the following equations:

  • Physical = sin (2Πt / 23)
  • Emotional = sin (2Πt / 28)
  • Intellectual = sin (2Πt /33)

Where Π = Pi and t = is the number of days since birth

The three calculated sine waves are then plotted on a graph - see "Biorhythms" diagram below.

Interpretation of the cycles

The diagram below represents the three sine waves for the cycles based on a birth date for a period of 30 days where the 1 on the X axis (midline) is the given start date.

Biorhythms

When the sine wave of a cycle is above the midline (x axis) of the graph then we may experience a "High" in that cycle e.g. for the intellectual cycle your thought processes may be sharper, concentration easier and you may have lots of ideas. When the sine wave of a cycle is below the midline of the graph then we may experience a "Low" in that cycle e.g. for the Physical cycle we may feel weak and listless. Viewing the three cycles for the 7 (on the midline), on the diagram above, we have Emotion and Intellectual are both High and Physical is Low.

When a sine wave crosses the midline then this is a critical time in the corresponding rhythm e.g. for the Emotional cycle you may feel irritable and sad, and have emotional outbreaks. If two sine waves cross the midline at the same point, this is a very critical time. On the diagram above the 9 (on the midline) looks like a critical period physically as the Physical sine wave crosses the midline.

Biorhythms - Fact or Fiction?

A study by Quigley (1981)[1] involved the alleged relationship between biorhythms and sport. The study looked at all world record breaking male athletes in track and field events from 1913 to 1977 and for certain events there was the evidence to support biorhythms. In a study by Hines (1998)[2] which involved the examination of some 134 biorhythm studies the conclusion of the study was that the biorhythms theory is not valid.

Try it Yourself

To find out what the next seven days may have install for you enter your date of birth and then select the Calculate Button

  Year Month Day
Date of Birth  
    days
Day
Intellectual
Emotional
Physical

Free Calculator

  • Biorhythms Calculator - a free Microsoft Excel spreadsheet that you can download and use on your computer. The spreadsheet will plot your biorhythms for the next 30 days.


References

  1. QUIGLEY, B. (1981) Biorhythms Cause Australian - N.Z. Tensions, The Skeptic, 1 (1), p. 2
  2. HINES, T. (1998) Comprehensive Review of Biorhythm Theory, Psychological Reports, 83, p. 19-64.

Page Reference

If you quote information from this page in your work then the reference for this page is:

  • MACKENZIE, B. (2013) Biorhythms [WWW] Available from: https://www.brianmac.co.uk/biorhythms.htm [Accessed

Related Pages

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