|
STARTING BLOCK PERFORMANCE IN SPRINTERS: A STATISTICAL
METHOD FOR IDENTIFYING DISCRIMINATIVE PARAMETERS OF THE PERFORMANCE
AND AN ANALYSIS OF THE EFFECT OF PROVIDING FEEDBACK OVER A 6-WEEK
PERIOD
|
Sylvie
Fortier1, Fabien A. Basset1 ,
Ginette A. Mbourou2, Jérôme Favérial3and
Normand Teasdale3 |
1School
of Human Kinetics and Recreation, Memorial University of Newfoundland, St.
John's NL, Canada
2Unité de Recherche en Gériatrie de l'Université Laval,
Hôpital Saint-Sacrement, 1050, chemin Sainte-Foy, Québec, Canada
3Groupe de Recherche en Analyse du Mouvement et Ergonomie, Division
de Kinésiologie, Département de Médecine Sociale et Préventive, Faculté
de Médecine, Université Laval, Québec, Canada
| Received |
|
08 November 2004 |
| Accepted |
|
21
March 2005 |
| Published |
|
01
June 2005 |
©
Journal of Sports Science and Medicine (2005) 4, 134 - 143
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| ABSTRACT |
| The
purpose of this study was twofold: (a) to examine if kinetic and kinematic
parameters of the sprint start could differentiate elite from sub-elite
sprinters and, (b) to investigate whether providing feedback (FB)
about selected parameters could improve starting block performance
of intermediate sprinters over a 6-week training period. Twelve male
sprinters, assigned to an elite or a sub-elite group, participated
in Experiment 1. Eight intermediate sprinters participated in Experiment
2. All athletes were required to perform three sprint starts at maximum
intensity followed by a 10-m run. To detect differences between elite
and sub-elite groups, comparisons were made using t-tests for independent
samples. Parameters reaching a significant group difference were retained
for the linear discriminant analysis (LDA). The LDA yielded four discriminative
kinetic parameters. Feedback about these selected parameters was given
to sprinters in Experiment 2. For this experiment, data acquisition
was divided into three periods. The first six sessions were without
specific FB, whereas the following six sessions were enriched by kinetic
FB. Finally, athletes underwent a retention session (without FB) 4
weeks after the twelfth session. Even though differences were found
in the time to front peak force, the time to rear peak force, and
the front peak force in the retention session, the results of the
present study showed that providing FB about selected kinetic parameters
differentiating elite from sub-elite sprinters did not improve the
starting block performance of intermediate sprinters.
KEY
WORDS: Feedback, kinetic, kinematic, performance, sprint.
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