Research Group on Metabolism, Nutrition and Strength Training, Department of Physical Education, Federal University of Parana, Curitiba, Brazil; University of Saskatchewan, College of Kinesiology, University of Saskatchewan, Saskatoon, Sakatchewan, Canada.
Research Group on Metabolism, Nutrition and Strength Training, Department of Physical Education, Federal University of Parana, Curitiba, Brazil; Centro-Oeste State University, Irati, Brazil.
Nutrition. 2019 Apr;60:94-99. doi: 10.1016/j.nut.2018.09.018. Epub 2018 Oct 13.
It is well established that ingestion of sodium bicarbonate (NaHCO) causes metabolic alkalosis. However, there is no consensus in terms of optimal NaHCO doses leading to enhanced performance. This study aimed to determine the effects of different NaHCO doses on performance and lactate clearance in non-professional cyclists.
Twenty-one cyclists performed the following three double-blind trials: 1) ingestion of 0.3 g · kg body weight (BW) of placebo; 2) ingestion of 0.1 g · kg BW NaHCO plus 0.2 g · kg BW placebo (0.1 BC); and 3) ingestion of 0.3 g · kg BW NaHCO (0.3 BC). Performance was evaluated after warm-up on the bike followed by a performance test until exhaustion. Lactate levels were monitored in blood samples before and immediately after performance tests.
Lactate levels in the blood were significantly higher after exercise in 0.3 BC and 0.1 BC (15.12 ± 0.92 versus 10.3 ± 1.22 and 13.24 ± 0.87 versus 10.3 ± 1.22 mmol/L; P < 0.05) compared with control. Significant improvements in performance were only identified in 0.3 BC group (76.42 ± 2.14; P = 0.01).
The present study found that 0.3 g · kg BW NaHCO is effective in improving performance and improving blood lactate levels in cyclists compared with control and 0.1 g · kg BW NaHCO
碳酸氢钠(NaHCO)的摄入会导致代谢性碱中毒,这一点已得到充分证实。然而,关于导致性能提升的最佳 NaHCO 剂量尚未达成共识。本研究旨在确定不同剂量的 NaHCO 对非专业自行车运动员的运动表现和乳酸清除率的影响。
21 名自行车运动员进行了以下三项双盲试验:1)摄入 0.3 克/公斤体重(BW)的安慰剂;2)摄入 0.1 克/公斤 BW 的 NaHCO 和 0.2 克/公斤 BW 的安慰剂(0.1 BC);3)摄入 0.3 克/公斤 BW 的 NaHCO(0.3 BC)。在自行车上热身后进行性能测试,直至力竭,评估运动表现。在运动测试前后监测血液样本中的乳酸水平。
与对照组相比,0.3 BC 和 0.1 BC 运动后血液中的乳酸水平明显升高(15.12 ± 0.92 与 10.3 ± 1.22 和 13.24 ± 0.87 与 10.3 ± 1.22 mmol/L;P < 0.05)。仅在 0.3 BC 组中观察到运动表现的显著改善(76.42 ± 2.14;P = 0.01)。
本研究发现,与对照组和 0.1 g · kg BW NaHCO 相比,0.3 g · kg BW NaHCO 可有效提高自行车运动员的运动表现和血液乳酸水平。