Relationship between laboratory-measured variables and heart rate during an ultra-endurance triathlon

Laursen, Paul B., Knez, Wade L., Shing, Cecilia M., Langill, Robert H., Rhodes, Edward C. and Jenkins, David G. (2005) Relationship between laboratory-measured variables and heart rate during an ultra-endurance triathlon. Journal of Sports Sciences, 23 10: 1111-1120. doi:10.1080/02640410400023209


Author Laursen, Paul B.
Knez, Wade L.
Shing, Cecilia M.
Langill, Robert H.
Rhodes, Edward C.
Jenkins, David G.
Title Relationship between laboratory-measured variables and heart rate during an ultra-endurance triathlon
Journal name Journal of Sports Sciences   Check publisher's open access policy
ISSN 0264-0414
1466-447X
Publication date 2005-01-01
Sub-type Article (original research)
DOI 10.1080/02640410400023209
Volume 23
Issue 10
Start page 1111
End page 1120
Total pages 10
Place of publication Abingdon, Oxfordshire, UK
Publisher Taylor & Francis
Language eng
Subject C1
321401 Exercise Physiology
730106 Cardiovascular system and diseases
110602 Exercise Physiology
Abstract The aim of the present study was to examine the relationship between the performance heart rate during an ultra-endurance triathlon and the heart rate corresponding to several demarcation points measured during laboratory-based progressive cycle ergometry and treadmill running. Less than one month before an ultra-endurance triathlon, 21 well-trained ultra-endurance triathletes (mean +/- s: age 35 +/- 6 years, height 1.77 +/- 0.05 in, mass 74.0 +/- 6.9 kg, (V) over dot O-2peak = 4.75 +/- 0.42 1 center dot min(-1)) performed progressive exercise tests of cycle ergometry and treadmill running for the determination of peak oxygen uptake ((V) over do O-2peak), heart rate corresponding to the first and second ventilatory thresholds, as well as the heart rate deflection point. Portable telemetry units recorded heart rate at 60 s increments throughout the ultra-endurance triathlon. Heart rate during the cycle and run phases of the ultra-endurance triathlon (148 +/- 9 and 143 +/- 13 beats center dot min(-1) respectively) were significantly (P < 0.05) less than the second ventilatory thresholds (160 +/- 13 and 165 +/- 14 beats center dot min(-1) respectively) and heart rate deflection points (170 +/- 13 and 179 +/- 9 beats center dot min(-1) respectively). However, mean heart rate during the cycle and run phases of the ultra-endurance triathlon were significantly related to (r = 0.76 and 0.66; P < 0.01), and not significantly different from, the first ventilatory thresholds (146 +/- 12 and 148 +/- 15 beats center dot min(-1) respectively). Furthermore, the difference between heart rate during the cycle phase of the ultra-endurance triathlon and heart rate at the first ventilatory threshold was related to marathon run time (r = 0.61; P < 0.01) and overall ultra-endurance triathlon time (r = 0.45; P < 0.05). The results suggest that triathletes perform the cycle and run phases of the ultra-endurance triathlon at an exercise intensity near their first ventilatory threshold
Keyword Sport Sciences
Rate Deflection Point
Cycling Performance
Applied Physiology
Exercise
Intensity
Predictor
Threshold
Validity
Lactate
Events
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 15:54:53 EST