KINEMATIC ANALYSIS OF UNDERWATER UNDULATORY SWIMMING PHASE AFTER A TRACK START
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Abstract
Purpose : This study aimed to determine and compare the kinematic data of underwater undulatory swimming (UUS) after a short and long (maximum effort) distance jumping.
Methods : Six male swimmers aged 18-25 years old were recruited for this study. Each swimmer had experienced in swimming competition at either the University game or National game levels. Each swimmer was asked to jump with a track start at either a short or a long (farthest) distance. Six underwater high speed cameras were used to collect data at a swimming pool. Qualisys motion capture system was used for data analysis. Maximum depth of head and foot, a distance of first kick from a start point, a horizontal velocity of gliding and underwater swimming phases were recorded. The mean differences of all dependent variables were compared between jumping conditions by using a paired t-test and between three underwater kicks by using one-way ANOVA respectively. The statistical significant was set at p-value ≤ .05.
Results : A long-distance jumping produced the lesser depth of head and foot in the water compared with a short- distance jumping. Whereas, the first kick was start at the farther distance during a long jumping compared with shorter jumping, the horizontal velocity was not significant different between conditions. Moreover, a short distance jumping showed a significant less horizontal velocity of the first kick than of the third kick.
Conclusion : A long distance of track swimming start showed no difference in time to gliding the water, but produced the lesser depth of head and foot in the water than a short distance jumping. Thus, this can lead to the lesser time in a track start.
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References
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