This preset utilizes
binaural beats based on the approximate range of purring frequencies of
domesticated cats, 27 to 44 Hz, which researchers now say can have restorative
effects on the body, particularly the healing and strengthening of bones.
From the Journal of the American Veterinary Medical Association
Healing and the cat's purr - Fauna Communications Research Institute
Scientists have discovered that the purring of cats is a "natural healing
mechanism" that has helped inspire the myth that they have nine lives.
Nine lives: wounded cats purr because it helps their bones and organs to heal
Wounded cats - wild and domestic - purr because it helps their bones and
organs to heal and grow stronger, say researchers who have analyzed the
purring of different feline species. This, they say, explains why cats survive
falls from high buildings and why they are said to have "nine
lives". Exposure to similar sound frequencies is known to improve bone
density in humans."
Doctors and scientists in a number of different medical fields are researching
the healing properties of sound, and the results are pretty promising. Most
body cavities and tissues have their own resonant frequencies, and sound in
those ranges can stimulate the respective organs to heal. For example: the
human lungs resonate at around 39 hertz (in a fluid medium) and researchers at
Georgia Tech and Emory University have found sound at that frequency to be
beneficial to people with lung diseases such as cystic fibrosis.
Solving the Mystery of the Cat's Purr using the World's Smallest
Elizabeth von Muggenthaler and Bill Wright
Ever since the Egyptians started worshipping the
cat, philosophers, scientists and cat lovers worldwide have wondered why cats
purr. Fauna Communications and ENDEVCO initiated a novel research study that
recorded the purrs of five species of cats - cheetah, puma, serval, ocelot and
the domestic cat. This research has contributed valuable information that may
solve the mystery behind the cat's purr.
It is commonly believed that cats purr when content. However, cats also purr
when they are severely injured, frightened or giving birth. So if cats were
purring solely out of happiness they would not purr when injured, especially
as the generation of the purr requires energy, and an injured animal will
generally not expend precious energy needed for healing on an activity not
directly connected with their survival.
Since the purr has lasted through hundreds of generations of cats, there must
be a survival mechanism behind its continued existence. Suggesting that the
purr evolved to function solely as a vocalisation of self-contentment goes
directly against the basic tenets of evolutionary psychology and natural
selection. Could the purr in any way link to the fact that vibrational
stimulation not only relieves suffering in 82% of persons suffering from acute
and chronic pain but also generates new tissue growth, augments wound tissue
strength, improves local circulation and oxygenation, reduces swelling and/or
inhibits bacterial growth?
Survival of the Fittest
Throughout history, the cat has been the most worshipped and the most
persecuted domestic animal. Perhaps the most popular cat saying is that they
have "nine lives". This type of old wives' tale usually has a grain
of truth behind it, especially since there is also an old veterinary school
adage that states "If you put a cat and a sack of broken bones in the
same room the bones will heal".
Most veterinary orthopedic surgeons have observed how relatively easy it is to
mend broken cat bones, as compared with dogs. In a study of "High Rise
Syndrome" found in the Journal of the American Veterinary Medical
Association, Drs. Whitney and Mehlhaff documented 132 cases of cats plummeting
from high-rise apartments, the average fall being 5.5 storeys, or 55 feet. The
record height for survival was 45 storeys. Ninety percent of the 132 cats
studied survived even though some had severe injuries. There is also
literature that suggests that domestic cats are in general less prone to
postoperative complications following elective surgeries
Cats do not have near the prevalence of orthopedic disease or ligament and
muscle traumas as dogs have, and non-union of fractures in cats is rare.
Researchers believe that self-healing is the survival mechanism behind the
purr. There is extensive documentation that suggests that low frequencies, at
low intensity, are therapeutic. These frequencies can aid bone growth,
fracture healing, pain relief, tendon and muscle strength and repair, joint
mobility, the reduction of swelling, and the relief of dyspnea, or
In order to measure the domestic cat's purrs and how purr vibration is spread
throughout its body ENDEVCO Model 22 accelerometers were used. Weighing a mere
0.14 gram, this is the world's smallest accelerometer. It mounts adhesively,
requires no external power and is ground isolated. It is typically used on
such small objects as scaled models, circuit boards and disk drives.
During tests, the cats relaxed on blankets, and were encouraged to purr by
occasionally stroking them. The small, lightweight Model 22 accelerometers
were placed directly on the skin of the cats and stabilised using washable
make-up glue and medical tape. Each recording session lasted between 6 and 10
minutes. Data was recorded on DAT recorders and analysed.
Results indicated that despite size and different genetics, all of the
individual cats have strong purr frequencies that fall within the range of a
multitude of therapeutic frequencies and particular decibel levels, see Fig.
3. Frequencies of 25 and 50 Hz are the best, and 100 Hz and 200 Hz the second
best frequencies for promoting bone strength. Exposure to these signals
elevates bone strength by approximately 30%, and increases the speed at which
the fractures heal.
Purring the Pain Away
All the cats had purr frequencies between 20 Hz and 200 Hz. With the
exception of the cheetah, which had frequencies ± 2 Hz from the rest, all the
species had frequencies, notably 25 Hz, 50 Hz, 100 Hz, 125 Hz, and 150 Hz,
that correspond exactly with the best frequencies determined by the most
recent research for bone growth, fracture healing, pain relief, relief of
breathlessness, and inflammation. All of the cats' purrs, including the
cheetah, had frequencies ±4 Hz from the entire repertoire of low frequencies
known to be therapeutic for all of the ailments.
That fact that the cats in this study produced frequencies that have been
proven to improve healing time, strength and mobility could explain the purr's
natural selection. After a day or night of hunting, purring could be likened
to an internal vibrational therapeutic system, a sort of "kitty
massage" that would keep muscles and ligaments in prime condition and
less prone to injury. Additionally, the purr could strengthen bone, and
prevent osteodiseases. Following injury, the purr vibrations would help heal
the wound or bone associated with the injury, reduce swelling, and provide a
measure of pain relief during the healing process.
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