Relation of heart rate to percent VO2 peak during submaximal exercise in the heat
Relation of heart rate to percent VO2 peak during submaximal exercise in the heat
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DOI：
10.1152/japplphysiol.00508.2002
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发表时间：
2003-03-01
影响因子：
3.3
通讯作者：
Cureton, KJ
中科院分区：
文献类型：
--
作者：
Arngrímsson, SA;Stewart, DJ;Cureton, KJ
我们测试的假设，即在次极量运动中的心率（HR）的升高，在一定程度上，最大O2摄取（%V steco 2 max）利用的百分比增加，由于减少最大O2摄取（V steco 2 max）在相同的热条件下运动后测量。在四种环境条件下，测量了22名男性和女性跑步者在次极量运动期间的峰值摄氧量（Vsteco 2峰值）、摄氧量和HR，旨在操纵次极量运动期间的HR和Vsteco 2峰值。这些条件包括在25、35、40和45°C下在对照V steco 2的1.33%下行走20分钟，随后立即测量在相同热环境中的V steco 2峰值。随着环境温度（Ta）的升高，Vsteco 2峰值逐渐降低（3.77 ± 0.19，3.61 ± 0.18，3.44 ± 0.17和3.13 ± 0.16 l/min），次极量运动结束时的HR逐渐升高（107 ± 2，112 ± 2，120 ± 2和137 ± 2 beats/min）。HR和%V steco 2 peakat以相同的方式随着Ta的增加而增加。我们的结论是，在次极量运动中的HR升高，在一定程度上，与%V steco 2 peakused的增加，这是由减少V steco 2 peakmeasured在运动中的热量。在高Ta时，持续次极量运动后测得的HR与% Vsteco 2峰值的分离小于假设在高温运动期间Vsteco 2峰值不变时的分离。
We tested the hypothesis that elevation in heart rate (HR) during submaximal exercise in the heat is related, in part, to increased percentage of maximal O2uptake (%V˙o2 max) utilized due to reduced maximal O2uptake (V˙o2 max) measured after exercise under the same thermal conditions. Peak O2uptake (V˙o2 peak), O2uptake, and HR during submaximal exercise were measured in 22 male and female runners under four environmental conditions designed to manipulate HR during submaximal exercise and V˙o2 peak. The conditions involved walking for 20 min at ∼33% of controlV˙o2 maxin 25, 35, 40, and 45°C followed immediately by measurement ofV˙o2 peakin the same thermal environment. V˙o2 peakdecreased progressively (3.77 ± 0.19, 3.61 ± 0.18, 3.44 ± 0.17, and 3.13 ± 0.16 l/min) and HR at the end of the submaximal exercise increased progressively (107 ± 2, 112 ± 2, 120 ± 2, and 137 ± 2 beats/min) with increasing ambient temperature (Ta). HR and %V˙o2 peakincreased in an identical fashion with increasing Ta. We conclude that elevation in HR during submaximal exercise in the heat is related, in part, to the increase in %V˙o2 peakutilized, which is caused by reduced V˙o2 peakmeasured during exercise in the heat. At high Ta, the dissociation of HR from %V˙o2 peakmeasured after sustained submaximal exercise is less than ifV˙o2 maxis assumed to be unchanged during exercise in the heat.