biorhythm

Biorhythm is a pseudoscientific theory that claims human lives are influenced by three distinct cyclical rhythms: physical, emotional, and intellectual. These cycles are believed to begin at birth and fluctuate in a sinusoidal pattern. The physical cycle is said to govern strength, coordination, and general well-being. The emotional cycle is thought to affect mood, creativity, and sensitivity. The intellectual cycle purportedly influences logical thinking, memory, and learning ability.

According to biorhythm proponents, each cycle can be represented as a wave oscillating between positive and negative phases. The positive phase is considered a period of high energy and capability in that particular area, while the negative phase is a time of lower energy and potential challenges. The points where the cycles cross the neutral line, known as "critical days," are theorized to be times of instability or increased risk.

The theory was popularized in the early 20th century by Wilhelm Fliess and Hermann Swoboda, and later by Alfred Teltscher. While some individuals have used biorhythm charts for personal planning or to predict events, scientific studies have generally found no correlation between biorhythm cycles and actual human performance, behavior, or well-being. The scientific community largely regards biorhythm as a pseudoscience, lacking empirical evidence to support its claims. There is no established biological mechanism to explain how such cycles would be generated or maintained.