Chatel Benjamin, Bret Carine, Edouard Pascal, Oullion Roger, Freund Hubert, Messonnier Laurent A
Laboratoire Interuniversitaire de Biologie de la Motricité, Université Savoie Mont Blanc, Campus Universitaire Savoie Technolac, Le Bourget-du-Lac cedex, 73376, Chambéry, France.
Aix-Marseille Université, CNRS, CRMBM UMR 7339, 13385, Marseille, France.
Eur J Appl Physiol. 2016 Aug;116(8):1455-65. doi: 10.1007/s00421-016-3420-0. Epub 2016 Jun 30.
The aim of this study was to investigate lactate recovery kinetics after high-intensity exercises.
Six competitive middle-distance runners performed 500-, 1000-, and 1500-m trials at 90 % of their current maximal speed over 1500 m. Each event was followed by a passive recovery to obtain blood lactate recovery curves (BLRC). BLRC were fitted by the bi-exponential time function: La(t) = La(0) + A 1(1-e (-γ1t) ) + A 2(1-e (-γ2t) ), where La(0) is the blood lactate concentration at exercise completion, and γ 1 and γ 2 enlighten the lactate exchange ability between the previously active muscles and the blood and the overall lactate removal ability, respectively. Applications of the model provided parameters related to lactate release, removal and accumulation rates at exercise completion, and net amount of lactate released during recovery.
The increase of running distance was accompanied by (1) a continuous decrease in γ 1 (p < 0.05), (2) a primary decrease (p < 0.05) and then a stabilization of γ 2, and (3) a constant increase in blood concentrations (p < 0.05) and whole body accumulation of lactate (p < 0.05). Estimated net lactate release, removal and accumulation rates at exercise completion, as well as the net amount of lactate released during recovery were not significantly altered by distance.
Alterations of lactate exchange and removal abilities have presumably been compensated by an increase in muscle-to-blood lactate gradient and blood lactate concentrations, respectively, so that estimated lactate release, removal and accumulation rates remained almost stable as distance increased.
本研究旨在调查高强度运动后乳酸恢复动力学。
六名竞技中长跑运动员以其当前1500米最大速度的90%进行500米、1000米和1500米测试。每次测试后进行被动恢复以获得血乳酸恢复曲线（BLRC）。BLRC用双指数时间函数拟合：La(t) = La(0) + A1(1 - e^(-γ1t)) + A2(1 - e^(-γ2t))，其中La(0)是运动结束时的血乳酸浓度，γ1和γ2分别反映先前活动肌肉与血液之间的乳酸交换能力和整体乳酸清除能力。该模型的应用提供了与运动结束时乳酸释放、清除和积累速率以及恢复期间释放的乳酸净量相关的参数。
跑步距离增加伴随着：（1）γ1持续下降（p < 0.05），（2）γ2先下降（p < 0.05）然后稳定，（3）血乳酸浓度持续增加（p < 0.05）以及全身乳酸积累增加（p < 0.05）。运动结束时估计的乳酸净释放、清除和积累速率以及恢复期间释放的乳酸净量不受距离的显著影响。
乳酸交换和清除能力的改变可能分别通过肌肉与血液之间乳酸梯度的增加和血乳酸浓度的增加得到了补偿，因此随着距离增加，估计的乳酸释放、清除和积累速率几乎保持稳定。
