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| Healthy controls | COPD | COPDND | COPDD | |
| ΔTSI, % | −13 (−24, −7) | −9 (−14, −6) | −6 (−14, −5) | −9 (−13, −8) |
| τ, s | 24 (17, 26) | 25 (18, 40) | 28 (18, 46) | 24 (18, 37) |
Values are expressed as median (25th percentile, 75th percentile). Abbreviations: TSI, tissue saturation index; τ, time constant of recovery of muscle oxygen saturation.
