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- Parametric Biometric Method From: Calvin Dietz
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Parametric Biometric Method
Posted by: "Calvin Dietz" dietz011@umn.edu dietz011
Fri Mar 30, 2012 7:38 am (PDT)
Parametric Biometric Method - Insert Section 6 from Triphasic Training Book
by Cal Dietz
Biometrics are variations of cybernetic programming, which were first
invented in the Soviet Union. It essentially is a regulatory process used
to figure out how much training and stress an organism should use on that
particular day.
Parametric biometrics is the use of another motor skill to regulate how
much training should take place for a different task. Traditional
biometrics, for example, could be using plyometrics (or any exercise) and
measuring its parameters with some type of tool (i.e. a v-scope, Tendo,
and/or force plates) to regulate how much speed, force, etc. is taking
place. This allows you to gauge when the drop off is of a certain
percentage, wherein you would stop training on that particular exercise for
that day.
When using isometrics and eccentrics, however, you are unable to use
biometrics for those particular exercises because obviously you are
changing the tempo such that it is no longer a concentric based movement.
What we use here is a separate measuring aspect of the same motor skill to
regulate how many sets and reps should be done in an isometric or eccentric
lifting exercise. I will give you the following examples: in using the back
squat or leg press in the isometric or eccentric phases of training, you
would perform an eccentric or isometric back squat and then rest 3-4
minutes (or whatever is prescribed). You'd then perform the motor tasks
that you are regulating. For example, this could be a squat jump with a
measurement tool; every time the athlete starts to drop off from their best
effort you would essentially stop squatting or doing the leg press
isometrics. I often start with the parametric using the best results I can
get for that particular day. For example, if the athlete jumps 30 inches
and then goes over and does the back squat, as long as the athlete can keep
repeating the 30 or 29-inch mark, I will have that athlete keep performing
the squat.
One of the ways I usually have my athletes perform a parametric motor task
for the lower body is using Vertimax belts hooked to Tendos such that so
that I can measure the percentage of their best squat jump. The key to many
of these parametric measurements that we are using is that you take all the
dynamics and variables out of the motor tasks. For example, in the squat
jump I often have them put their hands at their hips, don't swing their
arms, and I will try to have them jump straight up and down. What can
happen if they start to jump more horizontally is that they will actually
pull more wire out of the Tendo unit and thus get a higher reading. By
taking away as many variables as possible you get a more accurate
parametric reading. One suggestion may even be to constantly set their
depth with a high box at the right level and go from a pause so that you
can get a more accurate reading on the parametric relationship exercise.
Another example is the bench press. We take a very lightened load, 45 – 65
lbs with female athletes, and 95lb with males. Usually we do 2 reps; I
rarely have found to get much after the second repetition as far as max
speed. The third can be the same usually but anything after 3 will often
result in a decline on any particular motor skill dealing with max effort.
Again I usually do the plyometric exercise first and then perform an
isometric bench press for 6 seconds; do one rep, then follow that with a
few prehab exercises. Right before going to the bench press again, I will
do the plyometric exercise to regulate and see if the athlete can get
within 1-4% depending on the training frequencies and how often we will
train.
Many times people ask me where the drop off percentage comes from. I found
this through basic trial and error experiments with many athletes and
observing how much they could perform one day with a certain percent drop
off, and then how long it took them to heal so they could perform at the
same level again. Essentially, it started with an article on cybernetics
which has not been found in the English language (I only found it in the
Russian language), which noted that an athlete's best effort should be
within 1.5-2% of that at any given time. Now this 1.5-2% was done on the
sports skill and not necessarily the training skill so I believe you can
expand the training skill to the point where there are a bit larger margins
for error. The sporting skills in this sense were done every day so within
1-2% of training every day, whatever your training focus was, should have
been 1-2% of the main sports skill. With lifting and strength training this
would be a greater percentage just because of the fact that the frequency
isn't completed every day. You train one day and take a few days off, which
is why I saw an increase in the percentage and margins for drop off in this
biometric training method.
--
Cal Dietz
Strength Coach
Minneapolis, MN
612-626-7845
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