Figure 4.

Ratio of minute ventilation of cyclists compared to car passengers, calculated using individual versus population average model. On the x-axis the ratio is based on minute ventilation levels of cyclists and car passengers, where minute ventilation levels are calculated using individual regression coefficients. On the y-axis the minute ventilation levels are calculated using the mean regression coefficients calculated for all participants together, stratified by gender. Mean heart rates occurring during the cycling and car trips are used.