Arsoniadis Gavriil G, Nikitakis Ioannis S, Botonis Petros G, Malliaros Ioannis, Toubekis Argyris G
Division of Aquatic Sports, School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Dafne, 17237 Athens, Greece.
Sports Performance Laboratory, School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Dafne, 17237 Athens, Greece.
Sports (Basel). 2020 Jun 30;8(7):95. doi: 10.3390/sports8070095.
The purpose of this study was to verify the physiological responses and biomechanical parameters measured during 30 min of continuous swimming (T30) at intensity corresponding to lactate threshold previously calculated by an intermittent progressively increasing speed test (7 × 200 m). Fourteen competitive swimmers (18.0 (2.5) years, 67.5 (8.8) kg, 174.5 (7.7) cm) performed a 7 × 200 m front crawl test. Blood lactate concentration (BL) and oxygen uptake (VO) were determined after each 200 m repetition, while heart rate (HR), arm-stroke rate (SR), and arm-stroke length (SL) were measured during each 200 m repetition. Using the speed vs. lactate concentration curve, the speed at lactate threshold (sLT) and parameters corresponding to sLT were calculated (BL-sLT, VO-sLT, HR-sLT, SR-sLT, and SL-sLT). In the following day, a T30 corresponding to sLT was performed and BL-T30, VΟ-T30, HR-T30, SR-T30, and SL-T30 were measured after the 10th and 30th minute, and average values were used for comparison. VO-sLT was no different compared to VOT30 ( > 0.05). BL-T30, HR-T30, and SR-T30 were higher, while SL-T30 was lower compared to BL-sLT, HR-sLT, SR-sLT, and SL-sLT ( < 0.05). Continuous swimming at speed corresponding to lactate threshold may not show the same physiological and biomechanical responses as those calculated by a progressively increasing speed test of 7 × 200 m.
本研究的目的是验证在以间歇递增速度测试（7×200米）先前计算出的乳酸阈强度进行30分钟持续游泳（T30）期间所测量的生理反应和生物力学参数。14名竞技游泳运动员（18.0（2.5）岁，67.5（8.8）千克，174.5（7.7）厘米）进行了7×200米自由泳测试。每重复游完200米后测定血乳酸浓度（BL）和摄氧量（VO），同时在每200米重复游进过程中测量心率（HR）、划臂频率（SR）和划臂长度（SL）。利用速度与乳酸浓度曲线，计算出乳酸阈速度（sLT）以及与sLT对应的参数（BL-sLT、VO-sLT、HR-sLT、SR-sLT和SL-sLT）。在接下来的一天，进行了与sLT对应的T30测试，并在第10分钟和第30分钟后测量了BL-T30、VΟ-T30、HR-T30、SR-T30和SL-T30，采用平均值进行比较。VO-sLT与VOT30相比无差异（>0.05）。与BL-sLT、HR-sLT、SR-sLT和SL-sLT相比，BL-T30、HR-T30和SR-T30更高，而SL-T30更低（<0.05）。以乳酸阈速度进行持续游泳可能不会表现出与7×200米递增速度测试所计算出的相同的生理和生物力学反应。
