Figure 2

Relationships between breathlessness assessed by Borg scale and A] minute ventilation ($\stackrel{\mathbf{•}}{\mathit{V}}$E) expressed as absolute value and B]$\stackrel{\mathbf{•}}{\mathit{V}}$O ₂ expressed as a percentage of predicted value, in inactive men (n = 31, empty circles and dotted lines) and endurance-trained men (n = 31, filled squares and continuous lines). Upper panel. It gives the level of breathlessness (Borg score) according to the level of ventilation (20 to 100 L.min^-1). Each point for a single patient is calculated by linear interpolation since the degree of breathlessness during the CPET is obtained according to time. All subjects did not reach$\stackrel{•}{V}$ E at 60 L.min^-1. Lower panel. Mean values of$\stackrel{•}{V}$ O₂ and Borg score (obtained by interpolation) are given every minute of the exercise test in the two groups of subjects. Data are shown for a minimum of n = 10 subjects at each$\stackrel{•}{V}$ O₂ point. Mean values and standard error of the mean are represented. *p < 0.05 between inactive and endurance-trained men.