Effect of oral sodium loading on high-intensity arm ergometry in college wrestlers

Aschenbach, William G.; Ocel, J.; Craft, L.; Ward, Christopher W.; Spangenburg, Espen E.; Williams, Jon L.

doi:10.1097/00005768-200003000-00018

Cited by 30 publications

(26 citation statements)

References 30 publications

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“…Indeed it is now well established that individuals who undertake high-intensity training have elevated levels of muscle carnosine compared with endurance trained and untrained individuals (Parkhouse and McKenzie 1984;Parkhouse et al 1985). As carnosine is thought to play an important role in the homeostasis of muscle cells during high-intensity exercise (as an intracellular buffer) greater basal levels might 'offset' any potential ergogenic contribution from augmented extracellular NaHCO 3 (Aschenbach et al 2000;Derave et al 2010). …”

Section: Introductionmentioning

confidence: 99%

Expectancy of ergogenicity from sodium bicarbonate ingestion increases high-intensity cycling capacity

Higgins

Shabir

2016

Appl. Physiol. Nutr. Metab.

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lower for SHAM compared to PLA (P=0.020, d=0.6). There were no differences between treatments for blood lactate, blood glucose or heart rate.In summary, ergogenicity after NaHCO 3 ingestion might be influenced by expectancy which mediates perception of effort during subsequent exercise.The observed ergogenicity with SHAM did not affect our measures of cardiorespiratory physiology or metabolic flux.

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Section: Introductionmentioning

confidence: 99%

Expectancy of ergogenicity from sodium bicarbonate ingestion increases high-intensity cycling capacity

Higgins

Shabir

2016

Appl. Physiol. Nutr. Metab.

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“…Carnosine, an intracellular buffer, is thought to play an important role in the homeostasis of muscle cells during high-intensity exercise (Derave et al 2010) and thus might 'offset' any potential ergogenic contribution from NaHCO3 (Aschenbach et al 2000;Derave et al 2010). A recent meta-analysis demonstrated that the overall mean effect of NaHCO3 on exercise performance was more than 225% greater in 6 untrained (effect size; 95%CI: 0.59; 0.36-0.95) compared to trained (0.18; 0.13-0.33) individuals (Peart et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Evaluating the effects of caffeine and sodium bicarbonate, ingested individually or in combination, and a taste-matched placebo on high-intensity cycling capacity in healthy males

Higgins

Wilson

Hill

et al. 2016

Appl. Physiol. Nutr. Metab.

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This study evaluated the effects of ingesting sodium bicarbonate (NaHCO3) or caffeine individually or in combination on high-intensity cycling capacity. In a counterbalanced, crossover design, 13 healthy, noncycling trained males (age: 21 ± 3 years, height: 178 ± 6 cm, body mass: 76 ± 12 kg, peak power output (Wpeak): 230 ± 34 W, peak oxygen uptake: 46 ± 8 mL·kg(-1)·min(-1)) performed a graded incremental exercise test, 2 familiarisation trials, and 4 experimental trials. Trials consisted of cycling to volitional exhaustion at 100% Wpeak (TLIM) 60 min after ingesting a solution containing either (i) 0.3 g·kg(-1) body mass sodium bicarbonate (BIC), (ii) 5 mg·kg(-1) body mass caffeine plus 0.1 g·kg(-1) body mass sodium chloride (CAF), (iii) 0.3 g·kg(-1) body mass sodium bicarbonate plus 5 mg·kg(-1) body mass caffeine (BIC-CAF), or (iv) 0.1 g·kg(-1) body mass sodium chloride (PLA). Experimental solutions were administered double-blind. Pre-exercise, at the end of exercise, and 5-min postexercise blood pH, base excess, and bicarbonate ion concentration ([HCO3(-)]) were significantly elevated for BIC and BIC-CAF compared with CAF and PLA. TLIM (median; interquartile range) was significantly greater for CAF (399; 350-415 s; P = 0.039; r = 0.6) and BIC-CAF (367; 333-402 s; P = 0.028; r = 0.6) compared with BIC (313: 284-448 s) although not compared with PLA (358; 290-433 s; P = 0.249, r = 0.3 and P = 0.099 and r = 0.5, respectively). There were no differences between PLA and BIC (P = 0.196; r = 0.4) or between CAF and BIC-CAF (P = 0.753; r = 0.1). Relatively large inter- and intra-individual variation was observed when comparing treatments and therefore an individual approach to supplementation appears warranted

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“…Extracellular bicarbonate augments the efflux of cellular hydrogen ions, elevating the pH gradient between intracellular and extracellular environments, preserving a stable electrolyte gradient (Aschenbach et al, 2000;McNaughton et al, 2008). Studies conducted on the effects of sodium bicarbonate supplementation on high-intensity exercise performance are equivocal, with some studies reporting meaningful increases in mechanical power output of 5.4% (McNaughton et al, 1987), and 4.3% (Bishop et al, 2004) whilst others (Aschenbach et al, 2000;Horswill et al, 1988;Lavender & Bird, 1989;Robergs et al, 2005;Siegler et al, 2008) report no meaningful performance improvements.…”

Section: Introductionmentioning

confidence: 99%

Effects of Creatine and Sodium Bicarbonate Coingestion on Multiple Indices of Mechanical Power Output During Repeated Wingate Tests in Trained Men

Griffen

Rogerson

Ranchordas³

et al. 2015

International Journal of Sport Nutrition and Exercise Metabolism

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This study investigated the effects of creatine and sodium bicarbonate coingestion on mechanical power during repeated sprints. Nine well-trained men (age = 21.6 ± 0.9 yr, stature = 1.82 ± 0.05 m, body mass = 80.1 ± 12.8 kg) participated in a double-blind, placebo-controlled, counterbalanced, crossover study using six 10-s repeated Wingate tests. Participants ingested either a placebo (0.5 g·kg−1 of maltodextrin), 20 g·d−1 of creatine monohydrate + placebo, 0.3 g·kg−1 of sodium bicarbonate + placebo, or coingestion + placebo for 7 days, with a 7-day washout between conditions. Participants were randomized into two groups with a differential counterbalanced order. Creatine conditions were ordered first and last. Indices of mechanical power output (W), total work (J) and fatigue index (W·s−1) were measured during each test and analyzed using the magnitude of differences between groups in relation to the smallest worthwhile change in performance. Compared with placebo, both creatine (effect size (ES) = 0.37-0.83) and sodium bicarbonate (ES = 0.22-0.46) reported meaningful improvements on indices of mechanical power output. Coingestion provided small meaningful improvements on indices of mechanical power output (W) compared with sodium bicarbonate (ES = 0.28-0.41), but not when compared with creatine (ES = -0.21-0.14). Coingestion provided a small meaningful improvement in total work (J; ES = 0.24) compared with creatine. Fatigue index (W·s−1) was impaired in all conditions compared with placebo. In conclusion, there was no meaningful additive effect of creatine and sodium bicarbonate coingestion on mechanical power during repeated sprints.

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Effect of oral sodium loading on high-intensity arm ergometry in college wrestlers

Abstract: These data contradict previous reports of ergogenic benefits NaHCO3 and NaCl administration before exercise and further suggest that performance in this type of activity may not be enhanced by exogenously induced metabolic alkalosis or sodium ingestion.

Cited by 30 publications

References 30 publications

Expectancy of ergogenicity from sodium bicarbonate ingestion increases high-intensity cycling capacity

Expectancy of ergogenicity from sodium bicarbonate ingestion increases high-intensity cycling capacity

Evaluating the effects of caffeine and sodium bicarbonate, ingested individually or in combination, and a taste-matched placebo on high-intensity cycling capacity in healthy males

Effects of Creatine and Sodium Bicarbonate Coingestion on Multiple Indices of Mechanical Power Output During Repeated Wingate Tests in Trained Men

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