The aim of this study was to examine the exercise intensity during the swimming, cycling, and running legs of nondraft legal, Olympic-distance triathlons in well-trained, age-group triathletes. Seventeen male triathletes completed incremental swimming, cycling, and running tests to exhaustion. Heart rate (HR) and workload corresponding to aerobic and anaerobic thresholds, maximal workloads, and maximal HR (HR_max) in each exercise mode were analyzed. HR and workload were monitored throughout the race. The intensity distributions in three HR zones for each discipline and five workload zones in cycling and running were quantified. The subjects were then assigned to a fast or slow group based on the total race time (range, 2 h 07 min–2 h 41 min). The mean percentages of HR_max in the swimming, cycling, and running legs were 89.8% ± 3.7%, 91.1% ± 4.4%, and 90.7% ± 5.1%, respectively, for all participants. The mean percentage of HR_max and intensity distributions during the swimming and cycling legs were similar between groups. In the running leg, the faster group spent relatively more time above HR at anaerobic threshold (AnT) and between workload at AnT and maximal workload. In conclusion, well-trained male triathletes performed at very high intensity throughout a nondraft legal, Olympic-distance triathlon race, and sustaining higher intensity during running might play a role in the success of these athletes.

中文翻译：

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训练有素的年龄组运动员在远距离铁人三项运动期间的运动强度：一项观察性研究

这项研究的目的是在训练有素的年龄组铁人三项运动员中，研究非草稿合法的奥林匹克距离铁人三项在游泳，骑自行车和跑步时的运动强度。17名男性铁人三项运动员完成了递增的游泳，骑自行车和跑步测试，以至疲惫。分析了每种运动模式下与有氧和无氧阈值相对应的心率（HR）和工作量，最大工作量和最大HR（HR _max）。在整个比赛过程中都对人力资源和工作量进行了监控。对每个学科的三个人力资源区域和五个骑行和跑步工作量区域的强度分布进行了量化。然后根据总比赛时间（范围2 h 07 min–2 h 41 min）将受试者分为快或慢组。HR _max的平均百分比在所有参加者中，游泳，骑自行车和跑步双腿分别为89.8％±3.7％，91.1％±4.4％和90.7％±5.1％。两组之间在游泳和骑行腿部时，HR _max和强度分布的平均百分比相似。在跑步中，速度更快的组在无氧阈值（AnT）上的HR上方花费相对更多的时间，并且处于AnT的工作量与最大工作量之间。总之，训练有素的男子铁人三项运动员在整个非草拟的合法的奥林匹克距离铁人三项比赛中都表现出很高的强度，并且在跑步过程中保持较高的强度可能对这些运动员的成功发挥作用。