The present study investigated individualized sodium bicarbonate (NaHCO₃⁻) supplementation in elite orienteers and its effects on alkalosis and performance in a simulated sprint orienteering competition. Twenty-one Danish male and female elite orienteers (age = 25.2 ± 3.6 years, height = 176.4 ± 10.9 cm, body mass = 66.6 ± 7.9 kg) were tested twice in order to identify individual time to peak blood bicarbonate (HCO₃⁻ peak) following supplementation of 0.3 g/kg body mass NaHCO₃ with and without warm-up. The athletes also performed two 3.5 km time-trial runs (TT-runs) following individualized timing of NaHCO₃ supplementation (SBS) or placebo (PLA) on separate days in a randomized, double-blind, cross-over design. The occurrence of individual peak HCO₃⁻ and pH ranged from 60 to 180 min. Mean HCO₃⁻ and pH in SBS were significantly higher compared with PLA 10 min before and following the TT-run (p < .01). SBS improved overall performance in the 3.5 km TT-run by 6 s compared with PLA (775.5 ± 16.2 s vs. 781.4 ± 16.1 s, respectively; p < .05). SBS improved performance in the last half of the TT-run compared with PLA (p < .01). In conclusion, supplementation with NaHCO₃ followed by warm-up resulted in individualized alkalosis peaks ranging from 60 to 180 min. Individualized timing of SBS in elite orienteers induced significant alkalosis before and after a 3.5 km TT and improved overall performance time by 6 s, which occurred in the last half of the time trial. The present data show that the anaerobic buffer system is important for performance in these types of endurance events lasting 12–15 min.

本研究调查了精英定向运动员的个体化碳酸氢钠 (NaHCO ₃ ^- ) 补充剂及其对模拟短跑定向比赛中碱中毒和表现的影响。对 21 名丹麦男性和女性精英定向运动员（年龄 = 25.2 ± 3.6 岁，身高 = 176.4 ± 10.9 cm，体重 = 66.6 ± 7.9 kg）进行了两次测试，以确定个体达到血碳酸氢盐峰值的时间（HCO ₃ ^-峰值) 在有和没有热身的情况下补充 0.3 g/kg 体重的 NaHCO _{3后。运动员们还在 NaHCO 3}的个性化计时后进行了两次 3.5 公里的计时赛（TT-runs）在随机、双盲、交叉设计中，在不同的日子服用补充剂 (SBS) 或安慰剂 (PLA)。个别峰 HCO ₃ ^-和 pH 值的出现范围为 60 至 180 分钟。在 TT 运行前后 10 分钟，SBS 中的平均 HCO ₃ ^-和 pH 值显着高于 PLA ( p  < .01)。与 PLA 相比，SBS 将 3.5 公里 TT 跑的整体性能提高了 6 秒（分别为 775.5 ± 16.2 秒和 781.4 ± 16.1 秒；p  < .05）。与 PLA 相比，SBS 在 TT 运行的后半段提高了性能 ( p  < .01)。总之，补充 NaHCO ₃随后的热身导致个体化的碱中毒峰值从 60 到 180 分钟不等。精英定向运动员的 SBS 个体化计时在 3.5 公里 TT 前后引起了显着的碱中毒，并将整体表现时间提高了 6 秒，这发生在计时赛的后半段。目前的数据表明，厌氧缓冲系统对于这些持续 12-15 分钟的耐力项目的表现很重要。