On 10/1/01 10:07 PM, "Capt JT" <captjt@mi*.co*> wrote:

>> When I was a judo enthusiast we were taught that a choke is where you cut
>> off the flow of air whereas a strangle is where you cut off the flow of
>> blood.

Not sure what this has to do with tech diving, but in an article in Black
Belt Magazine there is described a test performed to determine whether or
not Judo-style choke holds or shime-waza, caused any serious or permanent
damage as a result of unconsciousness to a Judoka uke. The following are
excerpts from the article DANGER IN THE JUDO CHOKE? By Ken Endow. It has
been edited for purpose of this discussion:

"Three methods of choking were used: okurieri-jime, the neck squeezed as a
whole; katajuji-jime, the carotid arteries' region pressed; hadaka-jime, the
trachea depressed.

Describing the technique of choking in the 1968 AAU-USJF Official Judo
Handbook, Dr. E. K. Kiowai explains, "Basically, except for one form of
shimewaza, hadaka-jime the pressure is applied to the lateral side of the
neck which the anatomists call the 'carotid triangle' . . . In the center of
this triangle are the jugular veins, carotid artery and its branches and the
carotid sinus. No strong muscle protects this area. The pressure is applied
in a certain manner, depending upon the technique, directly on these
structures. It may be the fist or the collar of the judogi. Very often it is
the pressure of the dista end (joint) of the radius and the wrist which
compresses the soft structures of the neck. Until the above name structures
are-'sufficiently compressed the choke will not be effective. The neophyte
may submit not because of the choke but because of the fear of being choked
or the pain produced by improper choking methods." As Dr. Koiwai explains
it, the hadaka-jimi choke hold is different from other forms because part of
the pressure is applied to the larynx and trachea which is extremely painful
and the player will usually submit before unconsciousness intervenes.
 
It seems the pain threshold on the hadaka-jime method of choking was too
great to induce unconsciousness and would be a poor method to rely on in
tournament play because the opponent would probably fight all the more to
gain release. However with the okurieri-jime and the katajuji-jime all the
subjects lost consciousness and entered a state that was similar in many
respects to that of sleeping. As the subject regained consciousness
spontaneously his electroencephalogram readings returned to normal. It
should be repeated that in all the cases the performer released his grip
immediately after the subjects fell unconscious, thereby limiting the effect
of choking to a short period. But had the strangulation continued serious
aftereffects would have been expected.
 
What causes unconsciousness from choking? The findings show the stopping of
the flow of blood to the head plays an important role in causing the
unconsciousness. In other words, the subject blacks out due to the lack of
oxygen in the brain which is fed blood via the carotid arteries.
 
 Also linked to this lack of oxygen to the brain are the convulsions which
sometimes accompany the judo choke knockout. The electroencephalograph
recorded symptoms very similar to that of a short epileptic seizure. To
prevent any dangers that may accompany the choke, the Kodokan bulletin
advises it is dangerous to perform the choking bold on subjects with cardiac
disorders or those suffering from hypertension since the load to the heart
and the rise in blood pressure is marked. It is also advised that it is
dangerous for youngsters whose nervous system and heart have not yet
attained complete development."

--
Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]