Figure 4.

Time course for the peripheral blood concentrations of lactate, separately for COPD smokers (open symbols) and healthy smokers (closed symbols).

Notes: The results of visit 1 are displayed on the left (n=23/23); the results of the repeated visit (28±5 days later, n=20/19) are displayed on the right. Blood was drawn before (displayed at 0 minutes), after 5 minutes of exercise (displayed at 5 minutes), at the time of exhaustion or a maximum duration of 30 minutes exercise, and following a period of 20 minutes of rest (both displayed at the median duration for each group). Median levels and interquartile ranges are presented. There were no differences between COPD smokers and healthy smokers at the different time points.

Abbreviations: COPD, chronic obstructive pulmonary disease; min, minutes.