| Normal | Asthma |
| Air | SO2 | Air | SO2 |
Maximum heart rate beats·min−1 | 94.2 (89.8–98.6) | 96.6 (90.3–102.9) | 97.8 (91.5–104.3) | 94.0 (87.3–100.7) |
Minimum heart rate beats·min−1 | 55.42 (52.1–58.7) | 53.3 (49.9–56.8) | 53.8 (50.5–57.2) | 54.8 (51.6–57.9) |
Total power ms2 | 4825 (2461–7189) | 6555 (3188–9922)a | 3825 (2593–5057) | 2804 (2265–3343) |
High frequency power ms2 | 1708 (518–2898) | 2672 (872–4472) | 1141 (407–1875) | 602 (333–871) |
Low frequency power ms2 | 1401 (657–2145) | 1837 (806–2868) | 1502 (903–2101) | 930 (741–1119) |