LBEPS, Univ Evry, IRBA, University of Paris-Saclay, Evry, France.
French Institute of Sport (INSEP), Laboratory Sport, Expertise and Performance, Paris, France.
J Strength Cond Res. 2022 Sep 1;36(9):2602-2609. doi: 10.1519/JSC.0000000000003855. Epub 2021 Mar 2.
Thomas, C, Delfour-Peyrethon, R, Dorel, S, and Hanon, C. Positive effects of pre-exercise metabolic alkalosis on perceived exertion and post-exercise squat jump performance in world-class cyclists. J Strength Cond Res 36(9): 2602-2609, 2022-This study aimed to determine the effects of pre-exercise alkalosis in world-class cyclists on their general (rate of perceived exertion [RPE]) and local (category-ratio scale [CR10]) perceived rates of exertion and acid-base status during 2 types of training sessions. Eight world-class cyclists ingested either sodium bicarbonate (BIC) or a placebo (PLA) in a double-blind and randomized order before performing 4 × 1,000 m constant-power sprints (CP) or 3 × 500 m all-out sprints (AO), with 20 minutes of recovery time between each session. For AO, the performance was assessed through the cycling sprint velocity and a squat jump test during recovery. During both tests, RPE, CR10, and acid-base status were measured. Sodium bicarbonate ingestion was effective in inducing pre-exercise alkalosis, compared with a PLA ( p < 0.05). During CP, performance and RPE were the same for BIC and PLA ( p > 0.05) with no time effect. The CR10 increased for the last sprint in PLA ( p < 0.05) but was attenuated in BIC (BIC: 6 vs. PLA: 8.2; p < 0.05), whereas there was no difference in acid-base status. During AO, RPE and CR10 increased with time, with no BIC effect, whereas blood lactate concentration was different ( p < 0.05). Sodium bicarbonate supplementation had no effect on overall repeated sprints ( p > 0.05). However, world-class athletes responded to BIC with higher squat jump performance than the PLA condition after AO ( p < 0.05). Our results suggest a positive influence of pre-exercise alkalosis in world-class cyclists on local perception of efforts after constant load sprints and an attenuation of muscle power output decline postsprint, as evidenced by improved squat jump performance after all-out cycling effort.
托马斯、德尔福尔-佩雷通、德勒夫、萨恩和阿农。运动前代谢性碱中毒对世界级自行车运动员感知用力和运动后深蹲跳跃表现的积极影响。《力量与体能研究杂志》36(9)：2602-2609，2022-本研究旨在确定运动前碱中毒对世界级自行车运动员的一般（感觉用力率[RPE]）和局部（类别比量表[CR10]）感觉用力率的影响，以及在 2 种训练中运动员的酸碱状态。8 名世界级自行车运动员在进行 4 次 1000 米定功率冲刺（CP）或 3 次 500 米全力冲刺（AO）之前，以双盲和随机的方式分别摄入碳酸氢钠（BIC）或安慰剂（PLA），两次训练之间有 20 分钟的恢复期。对于 AO，通过在恢复期间的自行车冲刺速度和深蹲跳跃测试来评估表现。在这两项测试中，测量 RPE、CR10 和酸碱状态。与 PLA 相比，碳酸氢钠的摄入有效地诱导了运动前碱中毒（p<0.05）。在 CP 中，BIC 和 PLA 的表现和 RPE 相同（p>0.05），且无时间效应。在 PLA 中，最后一次冲刺的 CR10 增加（p<0.05），但在 BIC 中则减弱（BIC：6 对 PLA：8.2；p<0.05），而酸碱状态没有差异。在 AO 中，随着时间的推移，RPE 和 CR10 增加，BIC 没有影响，而血乳酸浓度则不同（p<0.05）。碳酸氢钠补充对整体重复冲刺没有影响（p>0.05）。然而，世界级运动员在 AO 后对 BIC 的反应比 PLA 条件更好，表现为深蹲跳跃表现提高（p<0.05）。我们的研究结果表明，运动前碱中毒对世界级自行车运动员的积极影响，表现在定负荷冲刺后局部用力的感知，以及冲刺后肌肉力量输出下降的减弱，这可通过全力自行车运动后的深蹲跳跃表现得到证明。
