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The biorhythm theory proposes that three biological cycles start at birth and oscillate regularly throughout life: the physical (23 days), emotional (28 days), and intellectual (33 days). The theory was formulated in the late 19th century by two physicians: Wilhelm Fliess (Freud's friend, cycles 23 and 28 days) and Hermann Swoboda. The 33-day intellectual cycle was added in 1928 by engineering professor Alfred Teltscher.
Each cycle is a sinusoidal wave from +100% (peak) to -100% (trough), passing through zero (critical day).
Controlled studies (notably Hines, 1998; Bischoff, 1980) found no correlation between biorhythms and performance, accidents or health. The theory is considered classic pseudoperiodicity. The remaining value is symbolic: take consciousness that energy oscillates, plan with self-observation.
No. Systematic studies have not confirmed the theory. It is today classic pseudoscience.
Due to confirmation bias: we remember bad days coinciding with troughs and forget bad days at peaks.