Department of Sports Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan.
Faculty of Kinesiology, University of Calgary, Calgary, AB, T2N 1N4, Canada.
Eur J Appl Physiol. 2024 Oct;124(10):2951-2964. doi: 10.1007/s00421-024-05504-4. Epub 2024 May 18.
The aims of the present study were to investigate blood lactate kinetics following high intensity exercise and identify the physiological determinants of 800 m running performance.
Fourteen competitive 800 m runners performed two running tests. First, participants performed a multistage graded exercise test to determine physiological indicators related to endurance performance. Second, participants performed four to six 30-s high intensity running bouts to determine post-exercise blood lactate kinetics. Using a biexponential time function, lactate exchange ability (γ), lactate removal ability (γ), and the quantity of lactate accumulated (QLaA) were calculated from individual blood lactate recovery data.
800 m running performance was significantly correlated with peak oxygen consumption (r = -0.794), γ and γ at 800 m race pace (r = -0.604 and -0.845, respectively), and QLaA at maximal running speed (r = -0.657). O and γ at 800 m race pace explained 83% of the variance in 800 m running performance.
Our results indicate that (1) a high capacity to exchange and remove lactate, (2) a high capacity for short-term lactate accumulation and, (3) peak oxygen consumption, are critical elements of 800 m running performance. Accordingly, while lactate has primarily been utilized as a performance indicator for long-distance running, post-exercise lactate kinetics may also prove valuable as a performance determinant in middle-distance running.
本研究旨在探讨高强度运动后血乳酸动力学，并确定 800 米跑运动表现的生理决定因素。
14 名竞技 800 米跑运动员进行了两项跑步测试。首先，参与者进行了多阶段递增负荷运动测试，以确定与耐力表现相关的生理指标。其次，参与者进行了 4 到 6 次 30 秒的高强度跑步冲刺，以确定运动后血乳酸动力学。使用双指数时间函数，从个体血乳酸恢复数据中计算乳酸交换能力（γ）、乳酸清除能力（γ）和乳酸积累量（QLaA）。
800 米跑运动表现与峰值摄氧量（r=-0.794）、800 米比赛速度时的γ和γ（r=-0.604 和-0.845）以及最大跑步速度时的 QLaA 显著相关。峰值摄氧量和 800 米比赛速度时的γ和γ解释了 800 米跑运动表现 83%的方差。
我们的结果表明，（1）高乳酸交换和清除能力，（2）高短期乳酸积累能力，以及（3）峰值摄氧量，是 800 米跑运动表现的关键因素。因此，虽然乳酸主要被用作长距离跑的表现指标，但运动后乳酸动力学也可能被证明是中距离跑的一个有价值的表现决定因素。
