Cats produce a low frequency of “purr-like” sound when they are happy and relaxed. The cat purr actually has a therapeutic effect on humans!
Recent studies show that sound frequencies between 18 and 35 Hertz have a positive effect on injured joint mobility; 25 and 50, 100 and 200 Hertz can help to strengthen bones.
The vibration of cat purrs falls exactly between 20 and 140 Hertz, which is PURRfect for reducing swelling, promoting bone growth, fracture and soft tissue healing.
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