Research On Changes Of Speed Frequency And Stroke Of Each 10m In 50m Freestyle Swimming

Introduction
The monitoring and analysis carried on for competitive swimming can help coaches and players find out the technical
changes of each stage in the race and make a comparison with other players to provide the improved basis for the future
training. Moreover, an ideal model (pattern) can be established according to the swimming characteristics of excellent
players in the race to offer a reference for the training of young players.

Methods
In the 4th City Games of the People’s Republic China, three fixed cameras were used to take pictures for the top 8
players in a live swimming race before the final of man 50m freestyle swimming. Then the average speed, stroke
frequency and stroke range of the 8 players in each stage of 10-20m, 20-30m and 30-40m stages were tested and
calculated with a TV editor.

Results
The average speed, stroke frequency and stroke range of the players passing 10-20m, 20-30m and 30-40m stages are
shown in the following list.

Analysis and discussion
The average speed of each on stage of the top 8 players in the final of made 50m freestyle swimming tends to decline
and the declination difference is remarkable(P<0.05) with the race going on. The swimming speed depends mainly on
the stroke frequency and stroke range. In this research, the stroke frequency and stroke range of the players tend to
decline, too. The declination of the stroke frequency has remarkable difference(P<0.05), while that of the stroke range
has not though it tends to decline(P>0.05). This shows that the main reason of affecting swimming race declination is
the stroke frequency of the players rather than their stroke range.
It is, in this research, believed that the speed declination in the swimming race is mainly caused by the declination of
their stroke frequency.

References
[1]. Zhong Yu. Present Research Condition About Process Analysis of Swimming Game. Journal of Xi’An Institute of
Physical Education. Vol. 17, No.3, 2000.
[2]. Lin Hong. Development and Application of the Technical Monitoring System for Swimming. Sport Science. Vol. 20,
No. 2, March, 2000.
[3].Ou kang ping. The Analysis on the Split Spread Characteristics in 50m Apnea. China Sport Science And
Technology. Vol. 35, No. 6, 1999.
[4]. AIS Biomechanics Swim Competition Analysis for Australian Swimming Inc. Pan Pacific Championships Sydney.
August 22-29th, 1999.

NOTA: O texto com a iconografia está no anexo.

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