Journal
JOURNAL OF APPLIED PHYSIOLOGY
Volume 89, Issue 3, Pages 899-907Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jappl.2000.89.3.899
Keywords
oxygen consumption; Vo(2) slow component; mathematical modeling; recovery
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The purpose of the present study was to comprehensively examine oxygen consumption ((V)over dot O-2,) 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 ((V)over dotO(2max)) 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 ire,,,). iio, responses were fit with either a two- (LT) exponential model. The parameters of the iio, kinetic response were similar between exercise modes, except for the (V)over dot O-2, 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.
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