Background. This study investigated respiratory gas exchanges and heart rate (HR) kinetics during early-phase recovery after a\nmaximal cardiopulmonary exercise test (CPET) in patients with chronic obstructive pulmonary disease (COPD) grouped according\nto airflow limitation. Methods. Thirty control individuals (control group: CG) and 81 COPD patients (45 with ââ?¬Å?mildââ?¬Â or ââ?¬Å?moderateââ?¬Â\nairflow limitation, COPDI-II, versus 36 with ââ?¬Å?severeââ?¬Â or ââ?¬Å?very severeââ?¬Â COPD, COPDIII-IV) performed a maximal CPET. The first\n3 min of recovery kinetics was investigated for oxygen uptake (VÃ?â?¡ O2),minute ventilation (VÃ?â?¡ E), respiratory equivalence, andHR.The\ntime for VÃ?â?¡ O2 to reach 25% (T1/4\nVÃ?â?¡ O2) of peak value was also determined and compared. Results.The VÃ?â?¡ O2, VÃ?â?¡ E, and HR recovery\nkinetics were significantly slower in both COPD groups than CG (
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