Did you know:
Cats purr with a consistent pattern and dominant frequency in the range of 25 – 150 Hertz ; 20 – 50 Hertz being the optimal frequencies for stimulating bone growth and fracture healing.
– Infrasound – Sounds we feel but cannot hear –
– Infra-sound can penetrate solid objects like walls and even go through mountains. –
How does it do that?
To begin with, ultrasound is a short wave; this shape and wavelength causes the sounds to bounce off objects. That’s why this sound frequency is used for sonar, and why bats and dolphins use it for echo-location.
Low frequency or infrasound is a very long wave that actually goes between particles and molecules of an object rather than bouncing off them. This is why infrasound can travel through buildings, mountains, etc.
An interesting thing happens when the space shuttle takes off: it creates infrasound that travels the earth about seven times before it dissipates. In fact, if you go about 30 miles south of Coco Beach there’s a little place called Satellite Beach where there is a hotel built mostly of glass. If you are in one of those rooms when the space shuttle is taking off, you will see the panes of glass bow inward about two-and-a-half inches!
Lots of things create infrasound: wind, building movement, trains going by, planes flying overhead, vehicles and animals.
– Now here’s the exciting part: the Cat’s Purr –
Interestingly, the optimal frequency for bone stimulation is 50 hertz. The dominant and fundamental frequency for three species of cats’ purrs is exactly 25 to 50 hertz –the best frequencies for bone growth and fracture healing.
The cat’s purr falls well within the 20 — 50 hertz anabolic range, and extends up to 140 hertz. All members of the cat family except cheetahs have a dominant or strong harmonic at 50 hertz. The harmonics of three cat species fall exactly on or within 2 points of 120 hertz, a frequency which has been found to repair tendons.
– Cat’s are not always happy when purring –
A few veterinarians have said that the purr is only a vocalization of contentment, and most people believe that; however cats are known to purr when they are injured and in pain as well as when they are content.
In one case, a cat had broken its femur and the femur was sticking out and yet, it was purring. So it can be safely assumed that purring is not always a sign of contentment.
Some people claim that cats purr when they’re injured because they’re humming to make themselves feel better. That makes absolutely no sense. If you’ve ever broken your leg or an arm and you find yourself in the emergency room, would you be whistling “Dixie” to make yourself feel better?
Purring takes a lot of energy. It’s created by both the diaphragm and the larynx. Getting a diaphragm to move for something other than breathing is difficult, it takes energy. When there is pain and suffering, our bodies are traumatized and they shut down non-essential activity. Since cats purr when they are severely injured or dying, it must be survival-related.
– ”Put a cat in a room with a bunch of broken bones – the bones will heal.” –
This statement is an old veterinarian’s adage and it’s still taught in veterinary schools to this day, but no one had actively pursed any studies on it until Elizabeth von Muggenthaler, a research scientist and bio-acoustic specialist took up the task.
Elizabeth found that the type of frequencies that are found in a cat’s purr are good for healing muscle, tendon, and ligament injuries, as well as for muscle strengthening and toning. They are good for any type of joint injury, wound healing, reduction of infection and swelling, pain relief, and relief of chronic pulmonary disease.
Authors of the veterinarians’ surgery manual say that what it basically comes down to is that, compared to other animals, cats simply don’t get chronic pulmonary disease, muscle and tendon injuries, bone diseases, and a lot of other things that dogs get. The purr seems to be a constant strengthener and toner for the muscles.
The average health of cats is considered to be greater than that of dogs. An actual case study was done where they took 52,000 animals and found that lameness in dogs occurred 3.6 percent and in cats only .26 percent. In another study, arthritis in dogs was listed as 2.4 percent of the population, and was not reported at all in cats. The prevalence of lameness in dogs occurred 3.1 percent of the time, and again, in cats it was not even mentioned. The overall incidence of primary lung tumors in the dog is 1.24 percent, and in the cat, .38 percent. This basically says that cats are in fact healthier than dogs are.
Interestingly, it’s rare for cats to get bone cancer, but when they do, it’s almost always in the distal end of the extremities — the paw — and that’s also where the vibrational signal is the weakest.
People like to say, “Oh, that’s just coincidence,” but it can’t be. The odds of its being coincidence are like three billion to one.
Any veterinary orthopedic surgeon will tell you how relatively easy it is to mend broken cat bones compared with dog bones. Dog bones take much more effort to fix and longer to heal.
There is excellent documentation of cats’ quick recovery from such things as high-rise syndrome, which was first mentioned by Dr. Gordon Robinson and later studied and reported in the Journal of the American Veterinary Medical Association. They documented 132 cases of cats plummeting an average of 5.5 stories from high-rise apartments –some of them suffering severe injuries. But interestingly, 90 percent of these cats survived. Most cats that fell from seven stories or more managed to live. The record for survival from heights is 45 stories!
Is there a difference between a cat’s purr of contentment and the purr of a cat that’s been injured? Apparently, there is no difference. It’s machine-like. The purr is nearly the same across species: The ocelot, chervil, and domestic cat all create an identical sound.
An architectural engineer who measures building vibration was shown a data plot of a purr. When he viewed the graphs he asked if it was related to mechanics, since the signal appeared to be so regular. He was greatly surprised when he was told that he was looking at the analysis of a cat’s purr. It’s totally unlike any other animal’s vocalization.