Northgraves Matthew J, Peart Daniel J, Jordan Christian A, Vince Rebecca V
1Department of Sport, Health and Exercise Science, University of Hull, Hull, United Kingdom; and 2Biosciences, University Centre, North Lindsey College, Scunthorpe, United Kingdom.
J Strength Cond Res. 2014 Jan;28(1):273-80. doi: 10.1519/JSC.0b013e3182986a4c.
The use of nutritional supplements to improve sporting performance and increase training adaptations is commonplace among athletes and is an expanding market in terms of product choice and availability. The purpose of this study was to examine the effects of 2 ergogenic aids with extracellular blood buffering potential, namely sodium bicarbonate (NaHCO3) and a lactate supplement, during a 40-km cycling time trial. Seven recreationally active men (age, 22.3 ± 3.3 years; height, 182.5 ± 6.5 cm; body mass, 79.2 ± 6.3 kg) completed five 40-km cycling time trials, including a familiarization trial in a randomized, blind, double placebo-controlled design. Subjects ingested (a) 300 mg·kg-1 body mass NaHCO3 (BICARB), (b) 45 mg·kg-1 body mass sodium chloride (PL-BICARB) as the placebo for the NaHCO3 trial, (c) 1115 mg lactate (LACTATE), or (d) plain flour as the placebo for the lactate trial (PL-LACTATE) 60 minutes before exercise. There was no significant difference in performance between the 4 conditions (p > 0.05). Although NaHCO3 ingestion induced significant changes in all the acid-base variables (all p < 0.05), no significant change was seen following lactate ingestion (p > 0.05). Subjects in the LACTATE condition did have a significantly higher heart rate (p < 0.05) without experiencing any greater perceived exertion (p > 0.05) than the other 3 conditions. Neither NaHCO3 nor lactate supplementation seem to improve 40-km cycling time trial performance. However, the potential benefits following LACTATE regarding perceived exertion require further research.
使用营养补充剂来提高运动表现和增强训练适应性在运动员中很常见，并且在产品选择和可得性方面是一个不断扩大的市场。本研究的目的是在40公里自行车计时赛期间，研究两种具有细胞外血液缓冲潜力的促力剂，即碳酸氢钠（NaHCO₃）和乳酸补充剂的效果。七名有休闲运动习惯的男性（年龄，22.3±3.3岁；身高，182.5±6.5厘米；体重，79.2±6.3千克）完成了五次40公里自行车计时赛，包括一次随机、盲法、双安慰剂对照设计的适应性试验。受试者在运动前60分钟摄入：(a) 每千克体重300毫克的NaHCO₃（碳酸氢盐组），(b) 每千克体重45毫克的氯化钠（PL - BICARB）作为NaHCO₃试验的安慰剂，(c) 1115毫克乳酸（乳酸组），或(d) 普通面粉作为乳酸试验的安慰剂（PL - LACTATE）。这四种情况之间的表现没有显著差异（p>0.05）。尽管摄入NaHCO₃会引起所有酸碱变量的显著变化（所有p<0.05），但摄入乳酸后未观察到显著变化（p>0.05）。乳酸组的受试者心率显著更高（p<0.05），但与其他三种情况相比，并未感觉到更大的运动强度（p>0.05）。补充NaHCO₃和乳酸似乎都不能提高40公里自行车计时赛的表现。然而，乳酸补充剂在运动强度感知方面的潜在益处需要进一步研究。
