Effects of Time of Day on Race Splits, Kinematics, and Blood Lactate During a 50-m Front Crawl Performance
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Felipe D. Lisbôa ; João A.G. Raimundo ; Gustavo S. Pereira [1] ; Guilherme Ribeiro [2] ; Rafael Alves de Aguiar ; Fabrizio Caputo
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[1] Aquatic Biomechanics Research Laboratory, College of Health and Sport Science, Santa Catarina State University, Florianopolis, Brazil
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[2] Human Performance Research Group, College of Health and Sport Science, Santa Catarina State University, Florianopolis, Brazil
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- Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 35, Nº. 3, 2021, págs. 819-825
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
This study aimed to investigate the performance, race splits, metabolic, and stroke parameters during 2 successive 50-m front crawl under conditions simulating a competition. Eleven competitive male swimmers (20 +/- 3 years, 182 +/- 5 cm, and 77 +/- 5 kg) performed 2 successive 50-m front crawl trials in a 50-m swimming pool at 10 AM and 5 PM. Block time (tB), 15-m performance (t.15-m), and 50-m performance (t.50-m) were measured. Velocity (V), stroke rate (SR), stroke length (SL), and stroke index (SI) were measured at 3 time points during the trials. Pre-trial and post-trial blood samples were taken to determine blood lactate accumulation ([DELTA][Lac]). For t.50-m, the relative difference between 10 AM and 5 PM reached 0.1% (p = 0.7; effect size [ES] = 0.02). Furthermore, no differences in tB (p = 0.12; ES = -0.28) and t.15-m (p = 0.39; ES = -0.16) were observed between periods. Both V (p = 0.11; ES = -0.14) and SI (p = 0.16; ES = 0.15) were also similar. Higher values of SR were recorded at 10 AM (p = 0.03; ES = -0.32), whereas the morning values of SL were lower (p = 0.04; ES = 0.3). [DELTA][Lac] was not significantly different between periods (p = 0.07; ES = -0.27). Although time of the day did not impact performance in 2 successive 50-m front crawl performances, different stroke parameters profiles were observed during these trials. This may help coaches design specific warm-up exercises to enhance performance at different times of the day.
