Biorhythm

Understanding biorhythms: the 3 cycles (physical, emotional, intellectual), calculation and limitations. A 19th-century theory without scientific validation, but a reflection tool on personal cycles.

Deep dive into the physical (23 days), emotional (28 days) and intellectual (33 days) cycles: phases, amplitude, sinusoidal model and interactions.

In-depth study of critical days: single, double, and triple. Statistics, instability theory, aviation and sports studies, and what research actually found.

The extensions beyond the classic 3 cycles: intuitive (38 days), aesthetic (43 days), spiritual (53 days), awareness (48 days). Origins, authors, and level of validation.

How to calculate biorhythmic compatibility between two individuals. Cycle synchronization, physical, emotional and intellectual compatibility, popularity in Japan, and limitations.

Biorhythm pseudoscience vs the real science of biological rhythms: chronobiology, circadian, ultradian, and infradian cycles explained.

Using biorhythm awareness as an energy management tool: planning, self-observation, integration with Human Design and the Ki model.

The sinusoidal formula, modular arithmetic, how to calculate by hand and by computer. The mathematical elegance behind the three cycles.

From Fliess and Swoboda to the 1970s boom and scientific debunking: complete history, global popularity, meta-analyses, and current status.

Why ND profiles benefit more from cycle tracking. HSP emotional cycle amplification. ADHD physical cycle and hyperfocus windows. HPI intellectual cycle and creative bursts. Critical days as ND vulnerability windows. Using biorhythms with spoon theory. Biorhythm journaling for ND self-awareness.