A biorhythm (or biological rhythm) is a hypothetical cyclic pattern of alterations in physiology, emotions, and/or intellect. "Bio" comes from the word "life" and "rhythm" pertains to the flow with regular movement.

The basic theory

The theory of biorhythms claims one's lifecycle is affected by rhythmic cycles and makes approximate predictions of cycles of physical, mental and emotional characteristics. A rhythm or a cycle is a characteristic that is periodically repeated in a predictable and measurable way. Biorhythmics is composed of forecasting the synchronized rhythm by division into equal parts by time in one's life cycle. These inherent rhythms are said to control or initiate various biological processes and are classically composed of three cyclic rhythms that are said to govern human behaviour and the innate periodicity in natural cyclical physiological change. In its simplest general form, the theory states that from birth to death every human is governed by internal biophysical cycles: the physical, the emotional, and the intellectual. Others state there are more rhythms than the basic three. Some proponents think that biorythyms are related to bioelectricity and its interaction in the body.

Basic rhythms include certain facets of physiological cycles, though it may include others and the details may vary pending the specific source. The three classical cycles of biorhythms are endogenous infradian rhythms.

Basic rhythm details

Physical cycle (lasts 23 days)

Emotional cycle (lasts 28 days)

Intellectual cycle (lasts 33 days)

The theory's basis lies in physiological and emotional cycles. They are represented as a symmetrical or asymmetrical (though most theories rely on a symmetrical form). The most commonly used form is the sinusoidal one. This is said to be a graphical approximate representation of the bioelectric activity. The cycle flow of bioelectric activity undergoes periodic reverses in direction. A waveform is just a visual representation of the cycle's forecast. The waveforms start, in most theories, with their minimum values at the birth of each individual [neutral baseline (0%)].

Each cycles oscillates between a positive phase (<= 100%) and a negative phase (>= -100%), during which bioelectric activity strengthens and weakens. The purpose of biorhythms is to enable the approximate calculation of critical days for performing or avoiding various activities. he classical definition (derivatives of the original theory exist) states that one's birth is an unfavorable circumstantial event, as is the day about 58 years later when the three cycles are again synchronised at their minimum values. According to the classical definition, the theory is assumed to apply only to humans. In the classical theory, the value of each cycle can be calculated at any given time in the life of an individual, and there are web sites that do exactly that.

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