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标题：The Effects of NaHCO3 and NaCl Loading on Hematocrit and High-Intensity Cycling Performance
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作者：Matthew Driller ; Matthew Driller ; Andrew Williams 等
期刊名称：Journal of exercise physiology online
印刷版ISSN：1097-9751
出版年度：2012
卷号：15
期号：1
页码：47-56
语种：English
出版社：American Society of Exercise Physiologists
摘要：Driller M, Williams A, Howe S, Bellinger P, Fell J. The Effects of NaHCO3 and NaCl Loading on Hematocrit and High-Intensity Cycling Performance. JEPonline. 2012:15(1):47-56. Inconsistent findings regarding the benefits of sodium bicarbonate (NaHCO3) loading on exercise performance may be related to the use of sodium chloride (NaCl) as placebo substances. It has been postulated that the sodium content of both substances may contribute to performance benefits. The purpose of this study was to compare NaHCO3 and NaCl to a physically inert placebo by evaluating the effect of acute loading on high-intensity cycling performance. Eight well-trained cyclists (age = 24 ± 7 yrs; mass = 77 ± 9 kg; VO2 peak = 59.8 ± 8.6 mL•kg-1 •min -1 ) completed a 2-min performance test on a cycling ergometer after either NaHCO3 loading (SB), NaCl loading (SC), or placebo loading (D) in a randomized, double-blind design. Blood samples were taken pre- and post-loading and pre- and post-performance test to analyze hematocrit levels. The SB trial produced significantly higher (P < 0.05) mean power (watts) in the 2-min test (514.9 ± 49.7) when compared to the SC and D trials (504.3 ± 51.0 and 498.7 ± 50.6, respectively), with no significant difference between SC and D trials (P > 0.05). There were no significant differences in hematocrit levels at any timepoint between the 3 trials (P > 0.05). These findings indicate that NaHCO3 loading produced significant performance enhancement when compared to both NaCl and a placebo substance.
关键词：Sodium Bicarbonate;Plasma Volume;Buffer;Alkalosis