Monitoring the lactate threshold in world-ranked swimmers.

Monitoring the lactate threshold in world-ranked swimmers.
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监测世界排名游泳运动员的乳酸阈值。

DOI:
10.1097/00005768-200102000-00019
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发表时间:
2001
影响因子:
4.1
通讯作者:
K. Swanwick
K. Swanwick
中科院分区:
医学2区
文献类型:
--
作者:
D. Pyne;Hamilton Lee;K. Swanwick

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目的 为了确定乳酸分析是否可以检测到在一个赛季中世界排名的游泳运动员耐力体能的离散方面的变化。 方法 8名男性和4名女性澳大利亚国家队游泳运动员年龄20- 27岁进行了7 × 200米递增游泳步测试,在1998年英联邦运动会(CG)前的8个月内,在4个场合:1月(10天前的世界锦标赛),5月(赛季初的营地),7月(赛季中期),8月(16天前的CG)。通过数学公式确定乳酸阈值(LT),该公式计算阈值作为乳酸-速度曲线的斜率和y轴截距的函数。 结果 最大200米测试时间最初从127.7 +/- 4.2 s(1998年1月)下降到130.2 +/- 4.5 s(1998年5月)和129.1 +/- 4.3 s(1998年7月),然后提高到126.8 +/- 4.2 s(1998年8月)(P < 0.005)。LT游泳速度(s.100 m(-)1)在CG前改善之前也在赛季中期下降(P < 0.02)(1998年1月:70.5 +/- 2.1; 1998年5月:72.0 +/- 2.2; 1998年7月:72.2 +/- 2.2; 1998年8月:70.8 +/- 2.1)。LT时的血乳酸浓度分别在1月、5月、7月和8月从3.6 +/- 0.2 mM降至3.2 +/- 0.1 mM和2.9 +/- 0.2 mM,然后恢复至3.4 +/- 0.2 mM。乳酸盐耐量等级(LT(5- 10)),定义为乳酸浓度为5.0和10.0 mM之间的速度差,在季节中期下降(P < 0.015):1月、5月、7月和8月分别为6.6 +/- 0.5 s.100 m(-1)、7.7 +/-0.5 s.100 m(-1)、8.5 +/- 0.5 s.100 m(-1)和6.9 +/- 0.4 s.100 m(-1)。尽管体能指标有了这些改善,但整个赛季的比赛表现并没有明显改善。 结论 世界排名的游泳运动员经过训练后,200米最大努力时间、乳酸盐耐量等级和LT时的游泳速度(s.100 m(-1))都有所改善,但这些变化与比赛表现没有直接关系。
PURPOSE To determine whether lactate profiling could detect changes in discrete aspects of endurance fitness in world-ranked swimmers during a season. METHODS Eight male and four female Australian National Team swimmers aged 20--27 yr undertook a 7 x 200-m incremental swimming step test on four occasions over an 8-month period before the 1998 Commonwealth Games (CG): January (10 d before the World Championships), May (early-season camp), July (midseason), and August (16 d before the CG). The lactate threshold (LT) was determined by a mathematical formula that calculated the threshold as a function of the slope and y-intercept of the lactate-velocity curve. RESULTS Maximal 200-m test time declined initially from 127.7 +/- 4.2 s (January 1998) to 130.2 +/- 4.5 s (May 1998) and 129.1 +/- 4.3 s (July 1998) before improving to 126.8 +/- 4.2 s (August 1998) (P < 0.005). The swimming velocity at LT (s.100 m(-)1) also declined midseason before improving before the CG (P < 0.02) (January 1998: 70.5 +/- 2.1; May 1998: 72.0 +/- 2.2; July 1998: 72.2 +/- 2.2; and August 1998: 70.8 +/- 2.1). The blood lactate concentration at the LT decreased (P < 0.02) from 3.6 +/- 0.2 mM to 3.2 +/- 0.1 mM and 2.9 +/- 0.2 mM before returning to 3.4 +/- 0.2 mM for January, May, July, and August, respectively. The lactate tolerance rating (LT(5--10)), defined as the differential velocity between lactate concentrations of 5.0 and 10.0 mM, declined midway through the season (P < 0.015): 6.6 +/- 0.5 s.100 m(-1), 7.7 +/- 0.5 s.100 m(-1), 8.5 +/- 0.5 s.100 m(-1), and 6.9 +/- 0.4 s.100 m(-1), for January, May, July, and August, respectively. Despite these improvements in indicators of fitness, there was no significant improvement in competition performance across the season. CONCLUSIONS Maximal effort 200-m time, lactate tolerance rating, and swimming velocity at LT (s.100 m(-1)) all improved in world-ranked swimmers with training, but these changes were not directly associated with competition performance.
DOI: --
发表时间: 1985
影响因子: 4.1
作者:
Brooks,GA
通讯作者: Brooks,GA