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Relationship of exercise test variables to cycling performance in an Ironman triathlon.
Eur J Appl Physiol. 2002 Aug; 87(4-5):433-40.EJ

Abstract

The purpose of this study was, firstly, to investigate the intensity of exercise performance of 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 x kg(-1) x 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 (VO(2)), 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], VO(2) [3.61 (0.15) compared to 2.64 (0.09) l x min(-1)], and [La(-)](b) [6.7 (0.8) compared to 2.8 (0.4) mmol x 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 x min(-1)], and significantly less than mean HR during Bi(Th,vent) [159 (3) beats x 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 x 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).

Authors+Show Affiliations

School of Human Moement Studies, The University of Queensland, Brisbane, Australia. plaursen@hms.uq.edu.auNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12172884

Citation

Laursen, Paul B., et al. "Relationship of Exercise Test Variables to Cycling Performance in an Ironman Triathlon." European Journal of Applied Physiology, vol. 87, no. 4-5, 2002, pp. 433-40.
Laursen PB, Rhodes EC, Langill RH, et al. Relationship of exercise test variables to cycling performance in an Ironman triathlon. Eur J Appl Physiol. 2002;87(4-5):433-40.
Laursen, P. B., Rhodes, E. C., Langill, R. H., McKenzie, D. C., & Taunton, J. E. (2002). Relationship of exercise test variables to cycling performance in an Ironman triathlon. European Journal of Applied Physiology, 87(4-5), 433-40.
Laursen PB, et al. Relationship of Exercise Test Variables to Cycling Performance in an Ironman Triathlon. Eur J Appl Physiol. 2002;87(4-5):433-40. PubMed PMID: 12172884.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Relationship of exercise test variables to cycling performance in an Ironman triathlon. AU - Laursen,Paul B, AU - Rhodes,Edward C, AU - Langill,Robert H, AU - McKenzie,Donald C, AU - Taunton,Jack E, Y1 - 2002/06/26/ PY - 2002/05/16/accepted PY - 2002/8/13/pubmed PY - 2003/3/27/medline PY - 2002/8/13/entrez SP - 433 EP - 40 JF - European journal of applied physiology JO - Eur. J. Appl. Physiol. VL - 87 IS - 4-5 N2 - The purpose of this study was, firstly, to investigate the intensity of exercise performance of 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 x kg(-1) x 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 (VO(2)), 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], VO(2) [3.61 (0.15) compared to 2.64 (0.09) l x min(-1)], and [La(-)](b) [6.7 (0.8) compared to 2.8 (0.4) mmol x 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 x min(-1)], and significantly less than mean HR during Bi(Th,vent) [159 (3) beats x 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 x 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). SN - 1439-6319 UR - https://www.unboundmedicine.com/medline/citation/12172884/Relationship_of_exercise_test_variables_to_cycling_performance_in_an_Ironman_triathlon_ L2 - https://dx.doi.org/10.1007/s00421-002-0659-4 DB - PRIME DP - Unbound Medicine ER -