Department of Sport, Health and Exercise Science, University of Hull, Hull HU6 7RX, UK.
J Strength Cond Res. 2010 Jan;24(1):103-8. doi: 10.1519/JSC.0b013e3181a392b2.
Boxing is a sport that consists of multiple high-intensity bouts separated by minimal recovery time and may benefit from a pre-exercise alkalotic state. The purpose of this study was to observe the ergogenic potential of sodium bicarbonate (NaHCO3) ingestion on boxing performance. Ten amateur boxers volunteered to participate in 2 competitive sparring bouts. The boxers were prematched for weight and boxing ability and consumed either 0.3 g.kg(-1) body weight (BW) of NaHCO3 (BICARB) or 0.045 g.kg(-1) BW of NaCl placebo (PLAC) mixed in diluted low calorie-flavored cordial. The sparring bouts consisted of four 3-minute rounds, each separated by 1-minute seated recovery. Blood acid-base (pH, bicarbonate [HCO3(-)], base excess [BE]), and performance (rates of perceived exertion [RPE], heart rate [HR] [HR(ave) and HR(max)], total punches landed successfully) profiles were analyzed before (where applicable) and after sparring. The results indicated a significant interaction effect for HCO3(-) (p < or = 0.001) and BE (p < 0.001), but not for pH (p = 0.48). Post hoc analysis revealed higher presparring HCO3(-) and BE for the BICARB condition, but no differences between the BICARB and PLAC conditions postsparring. There was a significant increase in punches landed during the BICARB condition (p < 0.001); however, no significant interaction effects for HRave (p = 0.15), HRmax (p = 0.32), or RPE (p = 0.38). The metabolic alkalosis induced by the NaHCO3 loading elevated before and after sparring blood buffering capacity. In practical application, the findings suggest that a standard NaHCO3 loading dose (0.3 g.kg(-1)) improves punch efficacy during 4 rounds of sparring performance.
拳击是一项由多个高强度回合组成的运动，每个回合之间的恢复时间极短，可能受益于运动前的碱化状态。本研究的目的是观察碳酸氢钠（NaHCO3）摄入对拳击表现的增效作用。10 名业余拳击手自愿参加 2 场竞争性对打。这些拳击手根据体重和拳击能力进行了预匹配，然后分别服用 0.3 g.kg(-1)体重的 NaHCO3（BICARB）或 0.045 g.kg(-1)体重的 NaCl 安慰剂（PLAC），两者均混合在稀释的低卡路里风味甜饮料中。对打回合由 4 个 3 分钟的回合组成，每个回合之间有 1 分钟的坐姿恢复期。分析了血液酸碱（pH 值、碳酸氢盐[HCO3(-)]、碱剩余[BE]）和表现（感知用力程度[RPE]、心率[HR]（HRave 和 HRmax）、成功落地的总拳数）参数，这些参数在对打前后（适用时）进行了分析。结果表明，HCO3(-)（p < 0.001）和 BE（p < 0.001）存在显著的交互作用效应，但 pH 值（p = 0.48）则没有。事后分析显示，BICARB 条件下的 HCO3(-)和 BE 在对打前更高，但 BICARB 和 PLAC 条件下的 HCO3(-)和 BE 在对打后没有差异。BICARB 条件下的出拳次数显著增加（p < 0.001）；然而，HRave（p = 0.15）、HRmax（p = 0.32）和 RPE（p = 0.38）之间没有显著的交互作用效应。NaHCO3 负荷引起的代谢性碱中毒在对打前后均提高了血液缓冲能力。在实际应用中，研究结果表明，标准的 NaHCO3 负荷剂量（0.3 g.kg(-1)）可提高 4 轮对打表现中的出拳效果。
