Effects of time of day on race splits, kinematics, and blood lactate during a 50-m front crawl performance
Deutscher übersetzter Titel: | Auswirkungen der Tageszeit auf Renn-Zwischenzeiten, Kinematik und Blutlaktat während einer 50-m-Kraulschwimmleistung |
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Autor: | Lisbôa, Felipe D.; Raimundo, João A.G.; Pereira, Gustavo S.; Ribeiro, Guilherme; Aguiar, Rafael A. de; Caputo, Fabrizio |
Erschienen in: | Journal of strength and conditioning research |
Veröffentlicht: | 35 (2021), 3, S. 819-825, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 1064-8011, 1533-4287 |
DOI: | 10.1519/JSC.0000000000002794 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU202103002382 |
Quelle: | BISp |
Abstract des Autors
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 (Δ[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). Δ[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.