Hence, it is necessary to distinguish between draft legal and nondraft legal races. O 2 (−14%) and HR (−7%), as compared to nondraft cycling with the same external load (speed) by triathletes. Drafting directly affects exercise intensity by reducing V. While elite triathletes compete in draft legal cycling, in which a competitor is permitted to draft within a sheltered position behind another, nonelite or age-group triathletes usually compete in nondraft legal racing. However, the cohorts of these studies were limited to elite triathletes. of the mean relative HR and workload during an OD race in relation to the individual metabolic capacities of elite triathletes assessed at each exercise mode (i.e., swimming, cycling, and running) reported 91%–92% of HR max for swimming, 90%–91% of HR max and 61.4%–63.4% of MAP for cycling, and 93%–94% of HR max for running. , the mean relative HR and workload of elite triathletes during cycling in OD race were 91% ± 4% of the maximal heart rate (HR max) and 60% ± 8% of the maximal aerobic power (MAP), although these measurements were not reported during the swimming and running legs. Studies investigating exercise intensity during an actual OD race are sparse. Thus, knowledge of exercise intensity profiles based on internal and external loads can facilitate greater comprehension of the physiological demands of the OD triathlon. In addition, the combination of internal load (HR) and external load (workload, i.e., speed and power output (PO)) can provide important information about the physiological demands during endurance events. Over the past two decades, heart rate (HR), as a marker of internal load, has been used to estimate exercise intensity, by relating individual competition HR values measured in the field with those obtained in a laboratory incremental test. However, it is difficult to measure these variables during actual competition. O 2) and blood lactate concentration (BLa) are two of the main parameters used to quantify exercise intensity. 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.Īlthough a large number of studies have investigated the physiological responses and acute consequences of multidisciplinary and endurance sporting events, relatively few have addressed the sustained exercise intensity encountered during an actual OD race. 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. The mean percentage of HR max and intensity distributions during the swimming and cycling legs were similar between groups. 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 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 intensity distributions in three HR zones for each discipline and five workload zones in cycling and running were quantified. HR and workload were monitored throughout the race. Heart rate (HR) and workload corresponding to aerobic and anaerobic thresholds, maximal workloads, and maximal HR (HR max) in each exercise mode were analyzed. Seventeen male triathletes completed incremental swimming, cycling, and running tests to exhaustion. 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.
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