Institute for Sport and Physical Activity Research, School of Sport Science and Physical Activity, University of Bedfordshire, Bedford,United Kingdom.
Musculoskeletal Physiology Research Group, Sport, Health and Performance Enhancement (SHAPE) Research Centre, School of Science & Technology, Nottingham Trent University, Nottingham,United Kingdom.
Int J Sport Nutr Exerc Metab. 2021 Nov 1;31(6):482-489. doi: 10.1123/ijsnem.2021-0076. Epub 2021 Sep 3.
This study determined the influence of a high- (HI) versus low-intensity (LI) cycling warm-up on blood acid-base responses and exercise capacity following ingestion of sodium bicarbonate (SB; 0.3 g/kg body mass) or a placebo (PLA; maltodextrin) 3 hr prior to warm-up. Twelve men (21 ± 2 years, 79.2 ± 3.6 kg body mass, and maximum power output [Wmax] 318 ± 36 W) completed a familiarization and four double-blind trials in a counterbalanced order: HI warm-up with SB, HI warm-up with PLA, LI warm-up with SB, and LI warm-up with PLA. LI warm-up was 15 min at 60% Wmax, while the HI warm-up (typical of elites) featured LI followed by 2 × 30 s (3-min break) at Wmax, finishing 30 min prior to a cycling capacity test at 110% Wmax. Blood bicarbonate and lactate were measured throughout. SB supplementation increased blood bicarbonate (+6.4 mmol/L; 95% confidence interval, CI [5.7, 7.1]) prior to greater reductions with HI warm-up (-3.8 mmol/L; 95% CI [-5.8, -1.8]). However, during the 30-min recovery, blood bicarbonate rebounded and increased in all conditions, with concentrations ∼5.3 mmol/L greater with SB supplementation (p < .001). Blood bicarbonate significantly declined during the cycling capacity test at 110%Wmax with greater reductions following SB supplementation (-2.4 mmol/L; 95% CI [-3.8, -0.90]). Aligned with these results, SB supplementation increased total work done during the cycling capacity test at 110% Wmax (+8.5 kJ; 95% CI [3.6, 13.4], ∼19% increase) with no significant main effect of warm-up intensity (+0.0 kJ; 95% CI [-5.0, 5.0]). Collectively, the results demonstrate that SB supplementation can improve HI cycling capacity irrespective of prior warm-up intensity, likely due to blood alkalosis.
本研究旨在确定在摄入碳酸氢钠（SB；0.3g/kg 体重）或安慰剂（PLA；麦芽糊精）3 小时前进行高强度（HI）与低强度（LI）自行车热身对血液酸碱反应和运动能力的影响。12 名男性（21±2 岁，79.2±3.6kg 体重，最大功率输出[Wmax]318±36W）以平衡方式完成了一次熟悉和四次双盲试验：SB 与 HI 热身，PLA 与 HI 热身，SB 与 LI 热身，以及 PLA 与 LI 热身。LI 热身持续 15 分钟，强度为 60%Wmax，而 HI 热身（精英人群的典型热身）则以 LI 开始，随后进行 2×30s（3 分钟休息）的 Wmax 运动，在以 110%Wmax 进行自行车能力测试前 30 分钟结束。整个过程中都测量了血液中的碳酸氢盐和乳酸。SB 补充剂使血液碳酸氢盐增加（+6.4mmol/L；95%置信区间，CI [5.7，7.1]），随后 HI 热身使其减少（-3.8mmol/L；95%CI [-5.8，-1.8]）。然而，在 30 分钟的恢复期内，所有条件下的血液碳酸氢盐都有所反弹并增加，SB 补充剂使血液碳酸氢盐增加约 5.3mmol/L（p<.001）。在以 110%Wmax 进行的自行车能力测试中，血液碳酸氢盐显著下降，而 SB 补充剂使下降幅度更大（-2.4mmol/L；95%CI [-3.8，-0.90]）。与这些结果一致，SB 补充剂使以 110%Wmax 进行的自行车能力测试中的总工作量增加（+8.5kJ；95%CI [3.6，13.4]，增加约 19%），而热身强度的主要影响无统计学意义（+0.0kJ；95%CI [-5.0，5.0]）。总的来说，结果表明，SB 补充剂可以提高 HI 自行车运动能力，而与之前的热身强度无关，这可能归因于血液碱化。
