POOLSIDE OEMONSTRATIONS
A KINEMATICAL. IMAGIOlOGICAl. ANO ACOUSTICAl BIOFEEDBACK SYSTEM FOR THE TECHNICAl TRAINING IN BREASTSTROKE
SWIMMING.
Lima AB1.2, Semblano P3, Fernandes D3, Gonçalves PI,
Morouço PI, Sousa FI, Fernandes RI, Barbosa T\ Correia
MV\ Tani G5, Vilas-Boas ]PI
IUniversity of Porto, Faculty of Sport, Porto, Portugal
.
2University of Ceará and University of Fortaleza. Fortaleza, Brazll
JUniversity of Porto, Faculty of Engineering, Porto, Portugal
4Department of Sports Sciences, Polytechnic Institute of Bragança,
Portugal
sUniversity of São Pau/o, São Paulo, Brazil.
INTRODUCTION
A system for real time velocimetric feedback, and for ~mmed.i­
ate disposal of kinematica[ dara, and model, synchromzed wlth
dual-media video images, will be presented.
DESCRIPTION
The system is composed by rhree different unities: (i) a dua[media image setup (Vilas-Boas et aI., 1997), upgraded for
images in follow up; (ii) a cable speedometer (Lima ec aI.,
2006), and (iH) a FM transmitter/receiver system, adapeed for
swimming use, and able to deliver real time velocimetric information to the swimmer and coach. The dual-media follow up
images setup uses a special charioe to move, along the lateral
wall of the pool, a set of two video cameras: one underwater
camera (Submergib[e AC230V), and one over-water aVC GRSX1, SVHS). The images ofboth cameras are mixed (Panasonic
Digital AV Mixer W}AVES), edited (Sony Color Triniton TV
monitor) and recorded (Panasonic AG-73S0). Differences in
refraction are corrected using the zoom optics of the overwater camera, and a calibration device. The dual-media images
are mixed with the display of a PC with kinematical information provided by the speedometer. This is a device for measuring the rotarional velocity of a cylin~er over which a ~ne nylon
cable is passing through. This cable IS fixed to the SWlmmer at
hip's leveI. The movement of the cylinder is :nonitored by a
rotaring incrementai coder connected to a mlcrocontroller
(PIC1SLF1320, Microchip). A electrical brake motor allow lhe
reduction of the inertia of the all system, keeping the cable
straight, and also allows the cable recoil action. The speedometer was also equipped with a audio outPUt, that allow a sound
of variable frequency to be sent to the swimmer and coach
through AM/FM receivers (Roadstar TRA-2221D) placed bellow the swimmers cap.
RESULTS
Results are v(t) real time curves, s)'nchronized with images,
and with corresponding auricular sounds. The software also
<illows the immediate modelling of a t}'pical stroke cycle, both
bimodal or trimodal, displaying mean velocities in noticeable
points, mean phase durarions and accelerations.
REFERENCES
Vilas-Boas ).P., Cunha, P., Figueiras, T., Ferreira, M., Duarte,
).A. (1996). Movement analysis in simultaneous swimming
techniques. In: K. Wilke, K. Daniel, U. Hoffmann,). K[auck
(eds.) Symposiumsbericht Kolner Schwimmsponage.
22
li"!', Por! Clen Desp 6ISupl.I·,
21-23
Bockenem: Sport Fahnemann Verlag, 95-103.
Lima A. B., Semblano P., Fernandes O., Gonçalves P-, Morouço
P., Sousa E, Fernandes R., Barbosa T., Correia M.V Tani G.,
Vilas-Boas]. P. (2006). A kinemarical, imagio[ogical, and
acousticaI biofeedback system for lhe rechnical training in
breaststroke swimming. rhis Symposium.
DYNAMOMETRIC SYSTEM FOR THE EVALUATIDN DF SWIMMING
TURNS.
Pereira 5 1.2, Roesler H2, Esteves CI, Gonçalves PI, Sousa
FI, Conceição FI, Machado LI, Lima A1.3, Vilar SI,
Fernandes RI, Vilas-8oasJPl
lUniversity of Porto, Faculty of Sport, Porto, Portugal
2State University of Santa Catarina, Florianópolis. Brazil
.
3University of Ceará and University of Fortaleza. Fortaleza, Brazd.
INTRODUCTION
A system for che dynamometric evaluation of swimming turns
will be presented.
DESCRIPTION
The system is composed by one underwater force piare, specifically developed for [his purpose, and based on rhe general
characteristics described b}' Roesler et aI. (2003). The force
pIare is fixed to the ending wall of the pool through a specific
structure conceived for this purpose.
The force plate is connecred to a PC using a Biopac (Biopac
Systems HLC100) ND converter, operating under control of
the Acknowledge software.
.
Landmarks in the bonom of the pool needed to be changed ll1
order to keep the official distance from lhe "T" mark 10 the
ending wall.
RESULTS
The system displayed allow the assessment of variables such
as,
(i) comact time;
(ii) impulse time;
(iii) horizontal componem of the platform reaction force;
(iv) horizontal impulse.
Results a[so allow perceiving the effect of different turning
techniques on rhe measured parameters, as well as the effects
of different variants of one same technique.
CONCLUSION
Results provided for such a dynamometrical setup allow swimmers [O test their best solurions for turning actioos, as wcll as
to train rheir technique, disposing of immediate feedback abom
criticai variables for the performance in this particular actlon.
DEVElOPMENT DF A MULTI-MEDIA SYSTEM FDR KINESIOlOGICAl
EVAlUATiON DF SWIMMING BY EXPERTS IN ANY PODl.
Soons B, Colman V, Persyn U
Faculty of Kinesiology and Rehabilitation Sciences, K.U.Leuvert
(Leuven). BeIgium.