Influence of Nutrient Intake after Weigh-In on Lightweight Rowing Performance

Slater, Gary; Rice, Anthony J.; Sharpe, Ken; Jenkins, David G.; Hahn, Allan G.

doi:10.1249/01.mss.0000240319.16029.5f

Cited by 15 publications

(22 citation statements)

References 29 publications

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“…Drag factor on the ergometer was set according to the Rowing Australia standards for gender, age, and weight classification. Subjects completed a 7-min standardized warm-up, adapted from a previously published protocol 9 (4 min at 70% of maximal power output, followed by a 3-min period that included passive rest and 2 × 10 maximal strokes) before initiating the 2000-m test. Subjects maintained the average 500-m split time from their most recent 2000-m ergometer test for the first 250 m, and then experimenters removed the ergometer display screen from view, to minimize any effect of pacing strategies on performance.…”

Section: Experimental Trialsmentioning

confidence: 99%

“…7,8 Meanwhile, investigations of other dietary interventions on rowing performance have incorporated repeated ergometer trials over several days to better simulate the demands of multiday regatta racing. 9,10 We were interested to study the effects of repeated bicarbonate loading strategies on ergometer trials undertaken 48 h apart both because of its relevance to real-life sport and the physiological issue of repeating alkalizing strategies. Furthermore, repeated trials present the opportunity to measure the reliability of measures such as performance (mean power, stroke rate), induced alkalosis [HCO 3 -] and associated test measures; blood lactate concentration [La -]; rating of perceived exertion (RPE) 11 ; and gastrointestinal (GI) symptoms.…”

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confidence: 99%

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Reliability and Effect of Sodium Bicarbonate: Buffering and 2000-m Rowing Performance

Carr¹,

Slater

Gore

et al. 2012

International Journal of Sports Physiology and Performance

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Purpose:The aim of this study was to determine the effect and reliability of acute and chronic sodium bicarbonate ingestion for 2000-m rowing ergometer performance (watts) and blood bicarbonate concentration [HCO3−].Methods:In a crossover study, 7 well-trained rowers performed paired 2000-m rowing ergometer trials under 3 double-blinded conditions: (1) 0.3 grams per kilogram of body mass (g/kg BM) acute bicarbonate; (2) 0.5 g/kg BM daily chronic bicarbonate for 3 d; and (3) calcium carbonate placebo, in semi-counterbalanced order. For 2000-m performance and [HCO3−], we examined differences in effects between conditions via pairwise comparisons, with differences interpreted in relation to the likelihood of exceeding smallest worthwhile change thresholds for each variable. We also calculated the within-subject variation (percent typical error).Results:There were only trivial differences in 2000-m performance between placebo (277 ± 60 W), acute bicarbonate (280 ± 65 W) and chronic bicarbonate (282 ± 65 W); however, [HCO3−] was substantially greater after acute bicarbonate, than with chronic loading and placebo. Typical error for 2000-m mean power was 2.1% (90% confidence interval 1.4 to 4.0%) for acute bicarbonate, 3.6% (2.5 to 7.0%) for chronic bicarbonate, and 1.6% (1.1 to 3.0%) for placebo. Postsupplementation [HCO3−] typical error was 7.3% (5.0 to 14.5%) for acute bicarbonate, 2.9% (2.0 to 5.7%) for chronic bicarbonate and 6.0% (1.4 to 11.9%) for placebo.Conclusion:Performance in 2000-m rowing ergometer trials may not substantially improve after acute or chronic bicarbonate loading. However, performances will be reliable with both acute and chronic bicarbonate loading protocols.

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Section: Experimental Trialsmentioning

confidence: 99%

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confidence: 99%

Reliability and Effect of Sodium Bicarbonate: Buffering and 2000-m Rowing Performance

Carr¹,

Slater

Gore

et al. 2012

International Journal of Sports Physiology and Performance

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“…Testing was completed in two cohorts, the first cohort (n = 6) at the Canning Bridge Rowing Centre, Perth, Western Australia, and the second cohort (n = 2) at the Australian National University, Canberra, Australian Capital Territory. Testing was conducted over a 20-day period; the first baseline test commenced on Day 1, and two experimental trials were subsequently performed, with 48 hr between trials to replicate the timing and physical demands of consecutive races in a rowing regatta, as has been done in several recent investigations (Slater, Rice, Sharpe, Jenkins, & Hahn, 2007;Slater et al, 2005;Slater, Rice, Tanner, Sharpe, Gore, et al, 2006;. Participants then trained normally and testing recommenced on Day 15, with baseline and experimental tests again separated by 48 hr.…”

Section: Experimental Overviewmentioning

confidence: 99%

Induced Alkalosis and Caffeine Supplementation: Effects on 2,000-m Rowing Performance

Carr¹,

Gore²,

Dawson³

2011

International Journal of Sport Nutrition and Exercise Metabolism

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“…Weight making practices have also been demonstrated to influence subsequent performance negatively (Burge et al, 1993;Horswill et al, 1990;Schoffstall et al, 2001). However, experimental studies indicate that short-term recovery including water and carbohydrate intake might offset such potential decrements in performance (Artioli et al, 2010b;Schoffstall et al, 2001;Slater et al, 2007), although the evidence is conflicting (Oopik et al, 1996).…”

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Dietary Intake at Competition in Elite Olympic Combat Sports

Pettersson

Berg²

2014

International Journal of Sport Nutrition and Exercise Metabolism

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The purpose of the current study was to investigate elite female (n = 21) and male (n = 47) combat sports athletes' (n = 68; mean age (± SD) 21.3 ± 3.8 years; mean height 177 ± 10.2 cm) dietary intake between weigh-in and the first bout in Olympic combat sports. The data were collected at 6 separate tournaments and measurements included estimated food records, time for recovery, and body weight (BW) at weigh-in and first match. In total, 33 athletes participated in wrestling and taekwondo, sports with extended recovery times, and 35 athletes in judo and boxing, sports with limited recovery time. The results displayed that despite a mean consumption of food and drinks corresponding to 4.2 kg, the athletes only regained an average of 1.9 kg BW during recovery. Water accounted for 86% of the total intake. For each liter of water consumed, athletes gained 0.57 kg BW, when excluding heavy weight athletes (n = 5). Carbohydrate consumption was 5.5 g/kg BW, compared with the recommended 8-10 g/kg BW. In total, one-quarter of the consumed water originated from carbohydrate-rich drinks. Given the average recovery time of 18 (wrestling, taekwondo) versus 8 hr (judo, boxing), the former group consumed twice the amount of water, carbohydrates, protein, and fat as the latter group. In conclusion, a large proportion of the participants did not meet the recovery nutrition guidelines for carbohydrates. In addition, the discrepancy between nutrient intake and weight gain points to the physiological barriers to retaining fluids during a limited recovery time after engaging in weight making practices.

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Influence of Nutrient Intake after Weigh-In on Lightweight Rowing Performance

Cited by 15 publications

References 29 publications

Reliability and Effect of Sodium Bicarbonate: Buffering and 2000-m Rowing Performance

Reliability and Effect of Sodium Bicarbonate: Buffering and 2000-m Rowing Performance

Induced Alkalosis and Caffeine Supplementation: Effects on 2,000-m Rowing Performance

Dietary Intake at Competition in Elite Olympic Combat Sports

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