The time dependence of the effect of ischemic preconditioning on successive sprint swimming performance.

Autor: Lisbôa FD; Human Performance Research Group, College of Health and Sport Science, Santa Catarina State University, Brazil. Electronic address: felipedlisboa@gmail.com., Turnes T; Human Performance Research Group, College of Health and Sport Science, Santa Catarina State University, Brazil., Cruz RS; Human Performance Research Group, College of Health and Sport Science, Santa Catarina State University, Brazil., Raimundo JA; Human Performance Research Group, College of Health and Sport Science, Santa Catarina State University, Brazil., Pereira GS; Aquatic Biomechanics Research Laboratory, College of Health and Sport Science, Santa Catarina State University, Brazil., Caputo F; Human Performance Research Group, College of Health and Sport Science, Santa Catarina State University, Brazil.
Jazyk: angličtina
Zdroj: Journal of science and medicine in sport [J Sci Med Sport] 2017 May; Vol. 20 (5), pp. 507-511. Date of Electronic Publication: 2016 Sep 20.
DOI: 10.1016/j.jsams.2016.09.008
Abstrakt: Objectives: The present study aimed to determine the effects of ischemic preconditioning on performance in three successive 50-m swimming trials and to measure stroke rate, stroke length and blood lactate accumulation.
Design: Counterbalanced, repeated-measures cross-over study.
Methods: On two separate days, eleven competitive male swimmers (20±3 years, 182±5cm, 77±5kg) performed three successive 50-m trials in a 50-m swimming pool, preceded by intermittent bilateral cuff inflation (4× 5-min of blood flow restriction+5-min of cuff deflation) at either 220 for thighs and 180mmHg for arms (ischemic preconditioning) or 20mmHg for both limbs (control-treatment). The 50-m trials were conducted 1-, 2-, and 8-h after the procedure.
Results: While no ergogenic effect of ischemic preconditioning was observed for 1-h (0.4%, 95% confidence limits of ±0.6%, p=0.215), there were clear beneficial effects of ischemic preconditioning on 2- and 8-h (1.0% and 1.2%, respectively; 95% confidence limits of ±0.6% in both cases, p≤0.002). Furthermore, ischemic preconditioning increased blood lactate accumulation in 2-(p<0.001) and 8-h (p=0.010) and stroke rate for 2- and 8-h in specific 10-m segments (p<0.05).
Conclusions: These findings suggest a time-dependent effect of ischemic preconditioning on 50-m swimming performance for competitive athletes, with the time window of the beneficial effect starting after about 2-h and lasting for at least 8-h after ischemic preconditioning. This change in performance was accompanied by an increase in blood lactate accumulation and faster strokes in front crawl.
(Copyright © 2016 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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