We assume cats purr because they are happy. But cats also purr when they are injured or dying. Why? Because purring is a Bio-Mechanism for Self-Repair.
Research shows that the frequency of a domestic cat's purr falls exactly between 25 Hz and 150 Hz. This is the "Goldilocks Zone" for vibrational therapy. Scientists have found that sound frequencies in this specific range:
Increase Bone Density: They stimulate osteoblasts to lay down new calcium.
Repair Tendons: They speed up soft tissue recovery.
Reduce Pain: They act as a mild analgesic.
When a cat sits on your chest and purrs, they are essentially giving you an ultrasound therapy session. Studies show that cat owners have a 40% lower risk of heart attack than non-cat owners. The purr lowers your blood pressure and cortisol simply by resonance.
Vital Insight: The Astronaut Connection: NASA has studied vibrational therapy to prevent bone loss in astronauts in zero gravity. The frequencies they use to keep astronaut bones strong? The same frequencies as a cat's purr. Nature solved the problem millions of years before NASA did.
Source: Journal of the Acoustical Society of America, "The felid purr: A healing mechanism?", Bioacoustics Analysis.
