Changes in VO_{2 max} Resulting from Bicycle Training at Different Intensities Holding Total Mechanical Work Constant

Abstract

Effects of different training intensities on VO₂ max were determined. Sixteen male Ss (ages 16–18) were randomly assigned to 1 of 3 training groups or a control group. The training groups trained 3 days/wk on bicycle ergometers at different intensities (85%, 75%, or 65% of HR max) with all groups doing the same total mechanical work (12,000 kpm per training session). Measurement of VO₂ at each of the 3 workloads in 2 anthropometrically similar individuals revealed a similar O₂ cost needed to accomplish 12,000 kpm of mechanical work. Analysis of covariance revealed a significant difference (p < .01) in VO₂ max between the groups. Significant differences (p < .01) were found between both the 85% and 75% groups and the control. No significant differences were found between the 65% group and the control or between the 75% and the 85% group. Within the limitations of the study, it was concluded that when comparing between training intensities while holding mechanical work constant it is necessary to work at a minimum of 75% of HR max to elicit significant changes in VO₂ max.