Journal of Applied Physiology
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J Appl Physiol 89: 899-907, 2000;
8750-7587/00 $5.00
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Vol. 89, Issue 3, 899-907, September 2000

Oxygen uptake kinetics in treadmill running and cycle ergometry: a comparison

Helen Carter1, Andrew M. Jones2, Thomas J. Barstow3, Mark Burnley4, Craig A. Williams4, and Jonathan H. Doust1

1 University of Surrey Roehampton, West Hill, London SW15 3SN; 2 Exercise Physiology Group, Manchester Metropolitan University, Alsager ST7 2HL, United Kingdom; 3 Department of Kinesiology, Kansas State University, Manhattan, Kansas 66506 - 0302; and 4 Chelsea School Research Centre, University of Brighton, Eastbourne BN20 7SP, United Kingdom

The purpose of the present study was to comprehensively examine oxygen consumption (VO2) kinetics during running and cycling through mathematical modeling of the breath-by-breath gas exchange responses to moderate and heavy exercise. After determination of the lactate threshold (LT) and maximal oxygen consumption (VO2 max) in both cycling and running exercise, seven subjects (age 26.6 ± 5.1 yr) completed a series of "square-wave" rest-to-exercise transitions at running speeds and cycling power outputs that corresponded to 80% LT and 25, 50, and 75%Delta (Delta  being the difference between LT and VO2 max). VO2 responses were fit with either a two- (<LT) or three-phase ( >LT) exponential model. The parameters of the VO2 kinetic response were similar between exercise modes, except for the VO2 slow component, which was significantly (P < 0.05) greater for cycling than for running at 50 and 75%Delta (334 ± 183 and 430 ± 159 ml/min vs. 205 ± 84 and 302 ± 154 ml/min, respectively). We speculate that the differences between the modes are related to the higher intramuscular tension development in heavy cycle exercise and the higher eccentric exercise component in running. This may cause a relatively greater recruitment of the less efficient type II muscle fibers in cycling.

oxygen consumption; VO2 slow component; mathematical modeling; recovery


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