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8/14/2019 Match Analysis an Undervalued Coaching Help
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Prof.Dr.Attilio Sacripanti M VI Dan
FIJLKAM1
Match Analysis an
Undervalued Coaching helpAn Italian judo Federation contribution
31/07/2009
Honorary Member
World Judo Scientific Congress
Rotterdam 2009
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Prof.Dr.Attilio Sacripanti M VI Dan
FIJLKAM2
Synopsis
1. Match Analysis
2. Judo Match Analysis
3. Locomotion complex
4. Judo locomotions paths in contest as strategicsource
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Prof.Dr.Attilio Sacripanti M VI Dan
FIJLKAM331/07/2009
1. Match Analysis
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Prof.Dr.Attilio Sacripanti M VI Dan
FIJLKAM4
In modern time match analysis is a powerfulcoaching help. Today the leading match analysissystems are utilized in team sport games.
On the basis of the technological development,Match Analysis could be a valuable source of fourlevels of coaching information for competition:
1. Athletes Physiological data2. Athletes Technical data
3. Athletes Strategic data
4. Adversarys Scouting
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Prof.Dr.Attilio Sacripanti M VI Dan
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In the Area of Physiological data, the quantitativeMatch analysis, well performed, could help intwo main ways:
1. Gross evaluation of the more precise energycost as input for conditioning
2. Accident prevention
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Prof.Dr.Attilio Sacripanti M VI Dan
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In the area of the Technical data, essentially qualitative
Match Analysis could be a very useful source ofinformation for the athletes biomechanicalenhancement, in six main ways:
a) Biomechanical evaluation of grips methods and fight.
b) Biomechanical improvement of throws techniques.
c) Biomechanical improvement of Standing-laying
connection
d) Biomechanical improvement of Ne waza techniques.
e) Biomechanical improvement of defensive systems.
f) Weak points analysis.
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Prof.Dr.Attilio Sacripanti M VI Dan
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In the area of Strategic data, qualitative-quantitativeMatch Analysis could be a very importantcoaching assist, in the study and the refinementof strategic plans adopted; by two ways:
a) Local Strategies.
b) Global Strategies.
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Prof.Dr.Attilio Sacripanti M VI Dan
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The same qualitative data base of athletes couldbe studied from a different point of view, togather information about most dangerousadversaries for each fighter, by the mainutilization today:
a) Adversarys Scouting
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Prof.Dr.Attilio Sacripanti M VI Dan
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2 Judo Match Analysis
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Prof.Dr.Attilio Sacripanti M VI Dan
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Judo as Situation Sport is a sports in which it is
not possible to find a repeatable motion patternin each game.
For each game, the motion is a random process.
These sports, in which athletes can contacttogether, are: contest sport or team sport, like:Judo, Boxing, Wrestling, Karate, Soccer, Basketball,
Football, Water Polo, Hockey, etc.
The correct biomechanical way to analyze suchmacro phenomena is to study them. in twosteps:
1. Interaction between players
2. Couple of athletes Motion
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Prof.Dr.Attilio Sacripanti M VI Dan
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Interaction Study
All Judo Throwing are based on two
physical principles
1) Couple of Forces application(Sacripantis Biomechanical model
1987)
2) Physical Lever application(Sacripantis Biomechanical model
1987)
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Prof.Dr.Attilio Sacripanti M VI Dan
FIJLKAM1231/07/2009
Throwing analysis is a complex task,
but
Study of displacement is a really difficult
one
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Motion Analysis
Judo shifting in contest
The motion is a particular kind of locomotion, thefirst and only study, till now, came from Japan
about All Japan judo Contest 1971
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http://stamfordjudo.us/yahoo_site_admin/assets/images/Larry_Randori.236104806_std.jpg -
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)()( = j jttut
')()1( FFttuvmaF ajj j +=+==
Couple of athletes motion in contest can be explained by a Langevin type
equation. It is the Second Sacripantis model (1989-90).
It is possible to write, for the global motion
Single Push pull contribution to motion
General equation
Friction Global push pull
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Motion Analysis
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Prof.Dr.Attilio Sacripanti M VI Dan
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Motion Analysis
Judo displacement in contest
Summation of (1, 2, 7, 12) random trajectoriesshowing the correctness of the Brownian motion
hypothesis: Random forces mean on time is zero
0' =F
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Prof.Dr.Attilio Sacripanti M VI Dan
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Into the First Study the path was connected to the gripsposition, by the Japanese researchers and was stated that:
it was found that in contest between judoists with the same form of
clinching, they revealed the tendency to circle the arena widely.In a contest between judoists with different form of clinching,
they showed the tendency to move directly toward the outside of
the arena
They obtained also the mean distance covered by judokas(121,1 m) and the mean shift velocity (0.30 m/s) during thecontests .
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Japanese Motion Study
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Prof.Dr.Attilio Sacripanti M VI Dan
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3 Locomotion complex
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Locomotion Important Point
-0.1
0.0
0.1
0.2
0.3
-0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
Distance (m)
step 1
step 2
lead
trail
both
line of gravity
Notice that as the combined centre of pressure moves backwards
and towards the lead-leg; the line of gravity proceeds forwards and
towards the trail-leg. The line of gravity is outside the base of
support shortly after the lead-leg lifts.
Judo locomotion is a very complex phenomenon. We must analyze
COM,COP and LOG interconnected motion to have the judo
trajectory connected to judoka body motion
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31/07/2009 18Prof.Dr.Attilio Sacripanti M VI Dan
FIJLKAM
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Prof.Dr.Attilio Sacripanti M VI Dan
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Interconnection of COM ,COP and COMP (LOG) in
quiet stance.
Mean and one standard deviation for center-of-pressure
paths during barefoot normal walking.
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Prof.Dr.Attilio Sacripanti M VI Dan
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Multifractals in locomotion
Previous studies shown that Fractional Langevin equationdescribes variability in the stride interval during walking
(Scafetta and others 2002- 2004)
')'()'()()(
0
0 dttttKXtXtX
t
==
Scaling
)()(
)()(
)()(
tXtX
tt
tKtK
H
H
=
=
=
+
q-moments, when is a Lvy random variable
0;)1()(
)( )(
>=
qbqHqq
tv qq
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Prof.Dr.Attilio Sacripanti M VI Dan
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4 Judo locomotions paths incontest as strategic source
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Prof.Dr.Attilio Sacripanti M VI Dan
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Virtual paths Pasculli Numerical Model
The motion patterns of the couple of athletes system are auseful practical tool with hidden information inside.
The shifting patterns study could be source of very usefulstrategic data, but the price for extract the hiddeninformation is a non trivial mathematical analysis of thesespecial time series.
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Advanced Motion Study
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Prof.Dr.Attilio Sacripanti M VI Dan
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Normally we are in presence of different paths
like diffusion processes, identified by the Hurstparameter.
In particular this parameter, time independent,
describes the fractional Brownian motion withanti-correlated samples for 0
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Prof.Dr.Attilio Sacripanti M VI Dan
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Pure Brownian motion: next step is uncorrelated with previousstep H=0.5
Anti-Persistent Fractional Brownian motion: each step is
negatively correlated with previous stepH 0.5
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Prof.Dr.Attilio Sacripanti M VI Dan
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An important feature of fBm modelling is the presence oflong-term correlations between past and future pathsincrements.
This means that the system is not a Markov system andthen more similar to real situation.
In this waya fighting path can show, if correctly analyzed,when the fighter have a specific fighting strategy or not(random motion) during competition.
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Prof.Dr.Attilio Sacripanti M VI Dan
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Resuming, if the CM Projection at a certain time isdisplaced towards a given direction, the larger
probability is that it drifts away in this direction(persistent or attacking behaviour) or in thecontrary it retraces its steps in the opposite
direction (antipersistent or defensive behaviour). Equality between these two probabilities
indicates that there is not presence of a definedstrategy in fighting.
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Prof.Dr.Attilio Sacripanti M VI Dan
FIJLKAM28
This information obtained by a pure mathematical lectureof trajectories; can be enhanced adding to the previousadvanced mathematical lecture other Biomechanicalfighting information like:
Grips form, Competition Invariants, Action Invariants,useful Attack polygonal surface, Direction of displacement,Time and position of gripping action, Throws loci, Lengthor Amount of displacement, Medium Speed, Surface Area
Utilization and so on. It is possible, with these added parameters, to obtain a lot
of useful strategic information.
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Thank s fo r your k ind a t t ent ion
Evolution of a couple of force throwing into a physical lever ones
Pictures Courtesy By Mr. David Finch
31/07/2009Prof.Dr.Attilio Sacripanti M VI Dan
30Honorary Member
World Judo Scientific Congress
Rotterdam 2009