Laboratory of Cardio-Circulatory, Respiratory, Metabolic and Hormonal Adaptations to the Muscular Exercise, Faculty of Medicine Ibn El Jazzar , Sousse, Tunisia ; High Institute of Sport and Physical Education , Gafsa, Tunisia.
J Sports Sci Med. 2008 Jun 1;7(2):279-85. eCollection 2008.
The purpose of this study was to assess, the effects of continuous and intermittent exercise training on lactate kinetic parameters and maximal aerobic speed (MAS) using field tests. Twenty-four male sport students were equally divided into continuous (CT) and intermittent (IT) physically trained groups. Another six participants acted as non-trained controls (CG). The trained participants practiced 6-days per week for 6 weeks. Before and after training, all participants completed an incremental exercise test to assess their MAS, and a 30- second supra-maximal exercise followed by 30 minutes of active recovery to determine the individual blood lactate recovery curve. It was found that exercise training has significantly increased MAS (p < 0.001), the lactate exchange and removal abilities as well as the lactate concentrations at the beginning of the recovery ([La]-(0)); for both CT and IT groups; this was accompanied by a significant reduction of the time to lactate-peak. Nevertheless, the improvement in MAS was significantly higher (p < 0.001) post-intermittent (15.1 % ± 2.4) than post-continuous (10.3 % ± 3.2) training. The lactate-exchange and removal abilities were also significantly higher for IT than for CT-group (P<0.05). Moreover, IT-group showed a significantly shorter half-time of the blood lactate (t-½-[La]) than CT-group (7.2 ± 0.5 min vs 7.7 ± 0.3 min, respectively) (p < 0.05). However, no significant differences were observed in peak blood lactate concentration ([La]peak), time to reach [La]peak (t-[La]peak), and [La]-(0) between the two physically-trained groups. We conclude that both continuous and intermittent training exercises were equally effective in improving t-[La]peak and [La]peak, although intermittent training was more beneficial in elevating MAS and in raising the lactate exchange (γ1) and removal (γ2) indexes. Key pointsCoaches and athletes need to be aware of the potentiality positive effects of exercise intensity.Improvements in physical fitness are associated with a concomitant increase in the lactate removal ability.In order to reduce lactate accumulation and increase maximal aerobic speed maximally, interval training method, with work speeds equal to 90% - 100% of MAS, may be the effective way when compared with continuous training method.
本研究旨在评估连续和间歇运动训练对使用现场测试的乳酸动力学参数和最大有氧速度（MAS）的影响。二十四名男性运动学生被平均分为连续（CT）和间歇（IT）体能训练组。另外六名参与者作为未经训练的对照组（CG）。训练参与者每周训练 6 天，共 6 周。在训练前后，所有参与者都完成了递增运动测试以评估他们的 MAS，以及 30 秒的超最大运动，随后进行 30 分钟的主动恢复，以确定个体的血乳酸恢复曲线。结果发现，运动训练显著提高了 MAS（p < 0.001）、乳酸交换和清除能力以及恢复开始时的乳酸浓度（[La]-（0））；对于 CT 和 IT 组都是如此；这伴随着乳酸峰的时间显著减少。然而，间歇训练后 MAS 的改善明显更高（p < 0.001）（15.1%±2.4）比连续训练后（10.3%±3.2）。IT 组的乳酸交换和清除能力也明显高于 CT 组（P<0.05）。此外，IT 组的血乳酸半衰期（t-½-[La]）明显短于 CT 组（分别为 7.2 ± 0.5 min 和 7.7 ± 0.3 min）（p < 0.05）。然而，两个体能训练组之间在峰值血乳酸浓度（[La]peak）、达到[La]peak 的时间（t-[La]peak）和[La]-(0)方面没有观察到显著差异。我们得出结论，连续和间歇训练在提高 t-[La]peak 和[La]peak 方面同样有效，尽管间歇训练在提高 MAS 和提高乳酸交换（γ1）和清除（γ2）指数方面更有益。要点教练员和运动员需要意识到运动强度的潜在积极影响。身体素质的提高与乳酸清除能力的同时提高有关。为了最大限度地减少乳酸积累并最大限度地提高最大有氧速度，与连续训练方法相比，间歇训练方法（工作速度等于 MAS 的 90% - 100%）可能是一种有效的方法。
