Relationship of exercise test variables to cycling performance in an Ironman triathlon

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• 作者：Paul B. Laursen ; Edward C. Rhodes ; Robert H. Langill ; Donald C. McKenzie and Jack E. Taunton
• 关键词：Ultra ; endurance Anaerobic threshold Ventilatory threshold Lactate Critical performance intensity
• 刊名：European Journal of Applied Physiology
• 出版年：2002
• 出版时间：January 2002
• 年：2002
• 卷：87
• 期：4-5
• 页码：433-440
• 全文大小：129 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Human Physiology
  Occupational and Industrial Medicine
  Sports Medicine
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1439-6327

文摘

The purpose of this study was, firstly, to investigate the intensity of exercise performanceof highly trained ultra-endurance triathletes during the cycling portion of an Ironman triathlon, and, secondly, to examine the anaerobic threshold and its relationship to this performance. Following a peak oxygen consumption (VO_2peak) test on a cycle ergometer to determine the heart rate (HR_Th,vent) and power output (PO_Th,vent) at the ventilatory threshold (Th_vent), 11 highly trained male triathletes [mean (SEM) age 35.8 (1.6) years, body fat 11.7 (1.2)%. VO_2peak 67.5 (1.0) ml·kg–1·min–1] who were participating in an Ironman triathlon, in random order: (1) cycled at their PO_Th,vent (Bi_Th,vent) until they were exhausted, and (2) cycled for 5 h at a self-selected intensity (Bi_SSI). Cycling power output (PO), oxygen uptake (VO₂), heart rate (HR) and blood lactate concentration ([La–]_b) were recorded at regular intervals during these trials, while performance HR was recorded during the cycling phase of the Ironman triathlon. Significantly greater (P<0.05) values were attained during Bi_Th,vent than during Bi_SSI for PO [274 (9) compared to 188 (9) W], VO₂ [3.61 (0.15) compared to 2.64 (0.09) l·min–1], and [La–]_b [6.7 (0.8) compared to 2.8 (0.4) mmol·l–1]. Moreover, mean HR during the Ironman triathlon cycle phase [146.3 (2.4) beats·min–1; n=7] was significantly greater than mean HR during Bi_SSI [130 (4) beats·min–1], and significantly less than mean HR during Bi_Th,vent [159 (3) beats·min–1; all P<0.05]. However, HR during the cycle portion of the Ironman triathlon was highly related to (r=0.873; P<0.05) and not significantly different to HR_Th,vent [150 (4) beats·min–1]. These data suggest that ultra-endurance triathletes cycle during the Ironman triathlon at a HR intensity that approximates to HR_Th,vent, but at a PO that is significantly below PO_Th,vent.