Background: The aim of this research was to examine the relationship between the fast component of oxygen consumption developed in 1-min V*O2 and force indices both measured in tethered swimming test and to assess the influence of the gathered indices on speed and swimming kinematics in 200-m front crawl race. Methods: Forty-eight male swimmers (aged 13.5 ± 0.9 years old) participated in this study. Testing included 1) 1-min all-out front crawl tethered swimming while oxygen consumption (breath by breath) and tethered forces were measured, 2) 200-m front crawl race-like swimming featuring kinematic analysis, and 3) biological age (BA) examination. Results: During the 1-min all-out tethered swimming test, a linear increase in oxygen consumption was observed. There were moderate to high partial correlations between particular periods of seconds in the 1-min V*O2: 31-60, 41-60, and 51-60 and Fmax, Fave, and Iave of tethered swimming, while 41-60 and 51-60 V?O2 were moderately to highly interrelated with all the swimming speed indices and SI. The swimming speed indices significantly interplayed with SL, SI, Fmax, Fave, and Iave. Partial correlations were computed with BA control. Conclusion: The ability of reaching a high level of V*O2 fast is essential for a swimmer`s energy production at short- and middle-distance events. Reaching a high level of V*O2 significantly determines tethered strength and swimming kinematics. The level of V*O2 influences the maintenance of a proper pulling force and the stroke technique of front crawl swimming in young male swimmers.
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