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Acute versus chronic supplementation of sodium citrate on 200 m performance in adolescent swimmers.

ABSTRACT: A double-blinded, placebo-controlled, cross-over design was used to investigate whether two different sodium citrate dihydrate (Na-CIT) supplementation protocols improve 200 m swimming performance in adolescent swimmers.Ten, male swimmers (14.9?±?0.4 years of age; 63.5?±?4 kg) performed four 200 m time trials with the following treatments: acute (ACU) supplementation (0.5 g kg(-1) administered 120 min pre-trial), acute placebo (PLC-A), chronic (CHR) supplementation (0.1 g?kg(-1) for three days and 0.3 g kg(-1) on the forth day 120 min pre-trial), and chronic placebo (PLC-C). The order of the trials was randomized, with at least a six-day wash-out period between trials. Blood samples were collected by finger prick pre-ingestion, 100 min post-ingestion, and 3 min post-trial. Performance time, rate of perceived exertion, pH, base excess, bicarbonate and lactate concentration were measured.Post-ingestion bicarbonate and base excess were higher (P?

SUBMITTER: Russell C

PROVIDER: S-EPMC4061773 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Acute versus chronic supplementation of sodium citrate on 200 m performance in adolescent swimmers.

Russell Colin C Papadopoulos Efthymios E Mezil Yasmeen Y Wells Greg D GD Plyley Michael J MJ Greenway Mathew M Klentrou Panagiota P

Journal of the International Society of Sports Nutrition 20140612

<h4>Background</h4>A double-blinded, placebo-controlled, cross-over design was used to investigate whether two different sodium citrate dihydrate (Na-CIT) supplementation protocols improve 200 m swimming performance in adolescent swimmers.<h4>Methods</h4>Ten, male swimmers (14.9 ± 0.4 years of age; 63.5 ± 4 kg) performed four 200 m time trials with the following treatments: acute (ACU) supplementation (0.5 g kg(-1) administered 120 min pre-trial), acute placebo (PLC-A), chronic (CHR) supplementa ...[more]

PMID: 24944546

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Project description:BACKGROUND:This study examined the effects of whey protein supplementation, compared with an isocaloric carbohydrate beverage and water, consumed immediately following an intense swimming trial on bone turnover in adolescent swimmers. METHODS:Fifty-eight (31 female, 27 male) swimmers (14.1?±?0.4?years) were stratified into three groups matched for age, sex and body mass. The protein and carbohydrate groups consumed two isocaloric post-exercise beverages each containing 0.3?g.kg-?1 of whey protein (with ~?6?mg of calcium) or maltodextrin while the control group consumed water. Participants provided a morning, fasted, resting blood sample, then performed an intense swimming trial consisting of a maximal 200?m swim followed by a high intensity interval swimming protocol (5x100m, 5x50m and 5x25m; 1:1 work-to-rest ratio). Following swimming, they consumed their first respective post-exercise beverage, and 2?h later, they performed a second maximal swim immediately followed by the second beverage. Approximately 3?h after the second beverage, two post-consumption blood samples were collected at 8?h and 24?h from baseline. Procollagen type 1 intact N-terminal propeptide (PINP) and carboxy-terminal collagen crosslinks (CTXI) were measured in serum. The multiples of medians of PINP and CTXI were also used to calculate bone turnover rate and balance. RESULTS:No significant changes were observed in PINP. CTXI increased (+?11%) at 8?h in all groups, but then significantly decreased (-?22%) at 24?h in the protein group only. The protein group also had a significantly higher calculated rate of bone turnover at 8?h and 24?h compared to baseline, which was not observed in the other groups. CONCLUSIONS:These results shed light on the potential importance of protein consumed shortly after intense swimming in promoting positive bone turnover responses up to 24?h following exercise in adolescent athletes. CLINICAL TRIAL REGISTRATION:ClinicalTrials.gov PRS; NCT04114045. Registered 1 October 2019 - Retrospectively registered.

Project description:Background:The aims of this study were to verify the effect of progressive-chronic and acute sodium bicarbonate (SB) supplementation on the anaerobic capacity, blood acid-base balance, and discipline-specific performance in team sports disciplines. Methods:Twenty-four trained male field hockey players completed a randomized, placebo-controlled, crossover trial of either progressive-chronic (increments from 0.05 up to 0.2?g/kg) or an acute one-off dose (0.2?g/kg) supplementation protocol. Before and after treatments, athletes completed an exercise protocol that comprised of a discipline-specific field performance test conducted between two separate Wingate anaerobic tests (WAnTs). Results:Progressive-chronic SB supplementation improved anaerobic capacity in the first bout of WAnTs, as observed based on an increase in mean power (MP: 575?±?71 vs. 602?±?67?W, p?=?0.005, ~?+?4.7%), peak power (PP: 749?±?94 vs. 777?±?96?W, p?=?0.002, ~?+?3.7%), power carry threshold (PCT) at 97%PP (727?±?91 vs. 753?±?93?W, p?=?0.002, ~?+?3.6%) and average power over PCT (739?±?94 vs. 765?±?95?W, p?=?0.001, ~?+?3.5%). Acute SB supplementation had no effect on anaerobic capacity. However, an improvement in time during discipline-specific field performance test was observed after progressive-chronic (919?±?42 vs. 912?±?27?s, p?=?0.05; ~?-?0.8%) and acute (939?±?26 vs. 914?±?22?s, p?=?0.006, ~?2.7%) SB supplementation. Acute SB supplementation also improved post-exercise parameters of acid-base balance (based on blood pH, bicarbonate concentration and base excess) compared to no supplementation or placebo. Conclusions:Our study indicates that both chronic and acute SB supplementation positively supports discipline-specific performance among field hockey athletes. Moreover, the chronic protocol supported anaerobic power indices before the inset of exercise-induced fatigue but had no significant impact afterwards. However, only the acute protocol significantly affected the buffering capacity, which can be used to determine athlete's performance during high-intensity sporting events. This study design therefore highlighted that future studies focusing on sodium bicarbonate supplementation in team sports should concentrate on the efficiency of chronic and acute supplementation in varying time frames.

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Acute versus chronic supplementation of sodium citrate on 200 m performance in adolescent swimmers.

Publications

Acute versus chronic supplementation of sodium citrate on 200 m performance in adolescent swimmers.

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