Dynamic pacing strategies during the cycle phase of an ironman triathlon

Abbiss, Chris R., Quod, Marc J., Martin, David T., Netto, Kevin J., Nosaka, Kazunori, Lee, Hamilton, Surriano, Rob, Bishop, David and Laursen, Paul B. 2006, Dynamic pacing strategies during the cycle phase of an ironman triathlon, Medicine and science in sports and exercise, vol. 38, no. 4, pp. 726-734, doi: 10.1249/01.mss.0000210202.33070.55.

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Title Dynamic pacing strategies during the cycle phase of an ironman triathlon
Author(s) Abbiss, Chris R.
Quod, Marc J.
Martin, David T.
Netto, Kevin J.
Nosaka, Kazunori
Lee, Hamilton
Surriano, Rob
Bishop, David
Laursen, Paul B.
Journal name Medicine and science in sports and exercise
Volume number 38
Issue number 4
Start page 726
End page 734
Publisher American College of Sports Medicine
Place of publication Madison, Wis
Publication date 2006-04
ISSN 0195-9131
Keyword(s) nonlinear complex system
fourier transformation
quadrant analysis
Summary Introduction: A nonlinear dynamic systems model has previously been proposed to explain pacing strategies employed during exercise.

Purpose: This study was conducted to examine the pacing strategies used under varying conditions during the cycle phase of an Ironman triathlon.

Methods: The bicycles of six well-trained male triathletes were equipped with SRM power meters set to record power output, cadence, speed, and heart rate. The flat, three-lap, out-and-back cycle course, coupled with relatively consistent wind conditions (17-30 km·h-1), enabled comparisons to be made between three consecutive 60-km laps and relative wind direction (headwind vs tailwind).

Results: Participants finished the cycle phase (180 km) with consistently fast performance times (5 h, 11 ± 2 min; top 10% of all finishers). Average power output (239 ± 25 to 203 ± 20 W), cadence (89 ± 6 to 82 ± 8 rpm), and speed (36.5 ± 0.8 to 33.1 ± 0.8 km·h-1) all significantly decreased with increasing number of laps (P < 0.05). These variables, however, were not significantly different between headwind and tailwind sections. The deviation (SD) in power output and cadence did not change with increasing number of laps; however, the deviations in torque (6.8 ± 1.6 and 5.8 ± 1.3 N·m) and speed (2.1 ± 0.5 and 1.6 ± 0.3 km·h-1) were significantly greater under headwind compared with tailwind conditions, respectively. The median power frequency tended to be lower in headwind (0.0480 ± 0.0083) compared with tailwind (0.0531 ± 0.0101) sections.

These data show evidence that a nonlinear dynamic pacing strategy is used by well-trained triathletes throughout various segments and conditions of the Ironman cycle phase. Moreover, an increased variation in torque and speed was found in the headwind versus the tailwind condition.
Language eng
DOI 10.1249/01.mss.0000210202.33070.55
Field of Research 110601 Biomechanics
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2006, American College of Sports Medicine
Persistent URL http://hdl.handle.net/10536/DRO/DU:30020360

Document type: Journal Article
Collections: Faculty of Health
School of Exercise and Nutrition Sciences
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