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Table 4 Breathing pattern, lung mechanics and gas exchange responses to exercise (n = 32)

From: Influence of resting lung diffusion on exercise capacity in patients with COPD

  Rest First work load Peak exercise
Heart Rate (bpm) 77 ± 10 92 ± 11 103 ± 22
RPE (6–20) 7 ± 2 11 ± 2 17 ± 2
Dyspnea (0-10) 1 ± 1 3 ± 2 7 ± 2
VE (L/min) 12.5 ± 2.7 24 ± 6 34 ± 11
Fb/VT ratio 26 ± 15 26 ± 14 30 ± 13
TI/TTOT ratio 39 ± 8 38 ± 4 39 ± 4
IC (L) 2.2 ± 0.7 1.9 ± 0.7 1.8 ± 0.7
VT/IC (%) 37 ± 13 52 ± 12 65 ± 27
VO2 ml/kg/min 3.7 ± 0.8 8.3 ± 1.4 11.4 ± 3.1
VE/VCO2 ratio 47 ± 7 37 ± 5 36 ± 5
PetCO2 mmHg 35 ± 5 37 ± 4 37 ± 5
O2Pulse 4 ± 1 8 ± 2 9 ± 3
SaO2 (%) 96 ± 2 95 ± 3 94 ± 3
  1. VE Minute ventilation, fb breathing frequency, VT tidal volume, TI inspiratory time, TTOT total respiratory cycle time, IC inspiratory capacity, VO 2 oxygen consumption, VCO 2 carbon dioxide production, PetCO 2 end tidal partial pressure of carbon dioxide, O 2 pulse VO2/heart rate, SaO 2 arterial oxygen saturation estimated from pulse oximetry