Truijens Martin J, Rodríguez Ferran A, Townsend Nathan E, Stray-Gundersen James, Gore Christopher J, Levine Benjamin D
Faculty of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
J Appl Physiol (1985). 2008 Feb;104(2):328-37. doi: 10.1152/japplphysiol.01324.2006. Epub 2007 Nov 29.
To evaluate the effect of intermittent hypobaric hypoxia combined with sea level training on exercise economy, 23 well-trained athletes (13 swimmers, 10 runners) were assigned to either hypobaric hypoxia (simulated altitude of 4,000-5,500 m) or normobaric normoxia (0-500 m) in a randomized, double-blind design. Both groups rested in a hypobaric chamber 3 h/day, 5 days/wk for 4 wk. Submaximal economy was measured twice before (Pre) and after (Post) the treatment period using sport-specific protocols. Economy was estimated both from the relationship between oxygen uptake (V(.-)o2) and speed, and from the absolute V(.-)o2 at each speed using sport-specific protocols. V(.-)o2 was measured during the last 60 s of each (3-4 min) stage using Douglas bags. Ventilation (V(.-)E), heart rate (HR), and capillary lactate concentration ([La(-)]) were measured during each stage. Velocity at maximal V(.-)o2 (velocity at V(.-)o2max) was used as a functional indicator of changes in economy. The average V(.-)o2 for a given speed of the Pre values was used for Post test comparison using a two-way, repeated-measures ANOVA. Typical error of measurement of V(.-)o2 was 4.7% (95% confidence limits 3.6-7.1), 3.6% (2.8-5.4), and 4.2% (3.2-6.9) for speeds 1, 2, and 3, respectively. There was no change in economy within or between groups (ANOVA interaction P = 0.28, P = 0.23, and P = 0.93 for speeds 1, 2, and 3). No differences in submaximal HR, [La-], Ve, or velocity at V(.-)o2(max) were found between groups. It is concluded that 4 wk of intermittent hypobaric hypoxia did not improve submaximal economy in this group of well-trained athletes.
为评估间歇性低压低氧联合海平面训练对运动经济性的影响，23名训练有素的运动员（13名游泳运动员、10名跑步运动员）被随机、双盲分配至低压低氧组（模拟海拔4000 - 5500米）或常压常氧组（0 - 500米）。两组均每周5天、每天3小时在低压舱内休息，共4周。在治疗期前后使用特定运动方案两次测量次最大运动经济性。运动经济性通过摄氧量（V̇o₂）与速度之间的关系以及使用特定运动方案在各速度下的绝对V̇o₂来估计。使用道格拉斯袋在每个（3 - 4分钟）阶段的最后60秒测量V̇o₂。在每个阶段测量通气量（V̇E）、心率（HR）和毛细血管乳酸浓度（[La⁻]）。最大V̇o₂时的速度（V̇o₂max时的速度）用作运动经济性变化的功能指标。使用双向重复测量方差分析，将给定速度下Pre值的平均V̇o₂用于Post测试比较。速度1、2和3时V̇o₂的测量典型误差分别为4.7%（95%置信限3.6 - 7.1）、3.6%（2.8 - 5.4）和4.2%（3.2 - 6.9）。组内或组间运动经济性均无变化（速度1、2和3时方差分析交互作用P = 0.28、P = 0.23和P = 0.93）。两组之间在次最大HR、[La⁻]、V̇E或V̇o₂(max)时的速度方面未发现差异。得出的结论是，4周的间歇性低压低氧并未改善这组训练有素的运动员的次最大运动经济性。
