Rest | Peak exercise | 2 min recovery | 5 min recovery | Peak change | |
Ammonia μmol·L−1 | |||||
COPD group 1 | 55.9±12.5 | 91.3±18.4*** | 93.0±19.2*** | 77.1±18.7*** | 42.8±3.3 |
COPD group 2 | 60.8±14.4 | 62.1±10.5 | 64.5±12.2 | 58.2±8.7 | 5.1±1.1+,§ |
Lactate nmol·L−1 | |||||
COPD group 1 | 0.70±0.23 | 2.00±0.89*** | 2.36±0.97*** | 2.18±0.91*** | 1.78±0.21+ |
COPD group 2 | 0.77±0.30 | 1.84±0.73** | 2.16±0.88*** | 1.81±0.68*** | 1.39±0.30+ |
Data are expressed as mean±sd. #: n = 15, peak work rate 69±21 W; ¶: n = 9, peak work rate 63±19 W. **: p<0.01 within group compared with resting; ***: p<0.001 within group compared with resting; +: p<0.001 between COPD and control group analysis of peak change; §: p<0.001 between COPD group 1 and group 2 analysis of peak change.