Fully automated motion analysis in javelin throw. Antonio Cicchella, Giacomo Mancini, Andrea Giovanardi Università degli Studi di Bologna, Facoltà di Scienze Motorie. antonio.cicchella@unibo.it Aims of this work was to assess the feasibility of a fully automated movement analysis system in field conditions for the extraction of relevant biomechanical parameters in the javelin throw 1 and to compare junior athletes with the results of experienced ones found in the literature. Methods: a Smart 3D motion analysis system (BTS, Milan, Italy) with 10 infrared cameras set at 250 Hz using passive markers was employed in daylight conditions on the throwing track. A set of 12 markers were put on body landmarks of two junior javelin throwers and two markers were used to identify the javelin, as shown in the stick diagram. Each athlete performed a total of 10 throws for distance. The best 8 throws were selected for the analysis. Range was 46-56,50 meters. Javelin velocity and angle with ground at release were computed using the SmartAnalyzer software. Results and Conclusions: the relationship between distance and javelin velocity at release is linear as expected, except for one throw. It is possible to observe that differences in the velocities of about 1 m/sec determine almost the same distance whereas release angle is more directly related to distance. Athletes of higher ranking ( 78.16 – 89.06 m vs 51-56.50 of our subjects) show higher velocities ( between 27.7 and 30.2 m/sec vs 21,42-23,26 in our study) 2. Release angle of javelin with ground also show a linear relationship, with the exception of one throw. Athletes of higher level of qualifications show a lower angle of the javelin at release (34-40° vs 40,5-47,34° in our study) 2. We hypothesized aerodynamic factors intervening during flight accounts for the two outliers and for obtaining the same distance with different release velocities. The method presented here seems suitable for fast feedback to the athletes and coaches on relevant parameters of the javelin throw.
Fully automated motion analysis in javelin throw / Cicchella A.; Mancini G.; Giovanardi A.. - In: JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS. - ISSN 0022-4707. - STAMPA. - suppl. 1 al nr. 3:(2010), pp. 3-4. (Intervento presentato al convegno Convegno Società Italiana di scienze motorie e sportive tenutosi a Torino nel 30 sett-2 ott. 2010).
Fully automated motion analysis in javelin throw
CICCHELLA, ANTONIO;
2010
Abstract
Fully automated motion analysis in javelin throw. Antonio Cicchella, Giacomo Mancini, Andrea Giovanardi Università degli Studi di Bologna, Facoltà di Scienze Motorie. antonio.cicchella@unibo.it Aims of this work was to assess the feasibility of a fully automated movement analysis system in field conditions for the extraction of relevant biomechanical parameters in the javelin throw 1 and to compare junior athletes with the results of experienced ones found in the literature. Methods: a Smart 3D motion analysis system (BTS, Milan, Italy) with 10 infrared cameras set at 250 Hz using passive markers was employed in daylight conditions on the throwing track. A set of 12 markers were put on body landmarks of two junior javelin throwers and two markers were used to identify the javelin, as shown in the stick diagram. Each athlete performed a total of 10 throws for distance. The best 8 throws were selected for the analysis. Range was 46-56,50 meters. Javelin velocity and angle with ground at release were computed using the SmartAnalyzer software. Results and Conclusions: the relationship between distance and javelin velocity at release is linear as expected, except for one throw. It is possible to observe that differences in the velocities of about 1 m/sec determine almost the same distance whereas release angle is more directly related to distance. Athletes of higher ranking ( 78.16 – 89.06 m vs 51-56.50 of our subjects) show higher velocities ( between 27.7 and 30.2 m/sec vs 21,42-23,26 in our study) 2. Release angle of javelin with ground also show a linear relationship, with the exception of one throw. Athletes of higher level of qualifications show a lower angle of the javelin at release (34-40° vs 40,5-47,34° in our study) 2. We hypothesized aerodynamic factors intervening during flight accounts for the two outliers and for obtaining the same distance with different release velocities. The method presented here seems suitable for fast feedback to the athletes and coaches on relevant parameters of the javelin throw.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
