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1FACULTY OF SPORTS STUDIES
Masaryk University Faculty of Sports Studies
2D and 3D Motion Analysis Autumn Semester- 2013/2014
Analysis of the starting blocks in
Swimming
Teacher: Mgr. Martin Sebera, Ph.D. Student: Catia Sofia Costa Alves
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d Ilji i, Masaryk University - Faculty of Sports Studies ^*w«w«™Bmr
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\utt& 2D and 3D Motion Analysis
9 STUDIES
Analysis of the starting blocks in Swimming
For the evaluation of the starting blocks, I used filming of a federated athlete in swimming, with extensive experience in Grab Start.
A calibration system (1x1 m) was used, as is shown in Figure 1. And I used the software motion analysis: Utilius Easylnspect.
Calibration system
Figure 1 ■ Calibration system adopted (1x1m).
Coordinates of the calibration system:
Points X (m) Y (m)
1 0.0 0.0
2 0.0 1.0
3 1.0 0.0
d Ilji i, Masaryk University - Faculty of Sports Studies ^*w«w«™Bmr
-* IMI y y y      ^ ^FACULTY
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j? Autumn Semester - 2013/2014 g 9I.SEQRTS
"^hna»* 2D and 3D Motion Analysis
9 STUDIES
Motion Analysis
For the evaluation of this technique, I analyzed several characteristics that could help me, that is, three different angles: Knee, Basin and Shoulder; the distance reached by the athlete (performance); the speed and angular acceleration of the body segments from the passage of the Preparation Phase for Departure Phase.
In Figure 2 we can visualize the layout of the body segments in the Preparation Phase and Departure Phase in technique Grab Start.
A B
Figure 2 ■ Passage of the Preparation Phase (A) for Phase Departure (B).
Figure 3 - Distance reached by the athlete.
13
d Ilji i, Masaryk University - Faculty of Sports Studies ^*w«w«™Bmr
-* IMI y y y      ^ ^FACULTY
•p,
j? Autumn Semester - 2013/2014 g 9I.SEQRTS
"^hna»* 2D and 3D Motion Analysis
9 STUDIES
A) B)
Knees            122.3° 147.9°
Basin              24° 141.7°
Shoulders          107.1° 162.4°
In the Preparation Phase the athlete has the lower and upper limbs bent, while in the Departure Phase is realized an extension of them. The knee angle suffers an increased, rising from 122.3° to 147.9°.
The basin level I checked a large angular difference, in the first phase angle was 24° and passes to 141 ° at the time of departure.
In the arms there is also a wide angular variation, since the athlete in the Preparation Phase passes of an angle of 107.1° to 162.4° in the next step. These changes were made only in 00:00.64 seconds.
With this technique, the athlete reached a maximum distance of 1.87metros -Performance, and since the Preparation Phase until the moment that the hand enters in the surface of the water, it takes 0.64" (seconds).
Angular data of the Grab Start:
	A	B	A8	w	a
Knee	122.3°	147.9°	25.6°	36.577s	52.247s2
Basin	24°	141°	117°	167.147s	238.777s2
Shoulders	107.1°	162.4°	55.3°	797s	112.867s2