Baseline characteristics of participants (n=6)
| Boys*, n | 4 |
| Age (year), median (min, max) | 10.5 (10, 12) |
| FEV1 (% of predicted) †, median (min, max) | 78 (74, 87) |
| PAQLQ‡, median (min, max) | 6.3 (5.0, 6.9) |
| Activity scale, median (min, max) | 6.1 (4.2, 7.0) |
| Symptoms scale, median (min, max) | 5.8 (4.7, 6.9) |
| Emotion scale, median (min, max) | 6.8 (5.4, 7.0) |
| ACQ§, median (min, max) | 0.7 (0.4, 1.0) |
| Use of ICS, n | 5 |
| Daily, regular use of β2-agonists, n | 6 |
| Overweight, n | 1 |
| MVPA (min/day), median (min, max) | 68.6 (46.2, 125.2) |
| VO2max (ml/kg/min), median (min, max) | 48.7 (24.7, 56.7) |
*With reference to girls. †Missing data in one participant. ‡Possible score between 0 (severe impairments of asthma) and 7 (no impairments). §Possible score between 0 (totally controlled) and 6 (extremely poorly controlled), missing data for one participant. ACQ, Asthma Control Questionnaire; FEV1, forced expiratory volume in 1 s; ICS, inhaled corticosteroids; max, maximum; min, minimum; MVPA, moderate-to-vigorous intensity physical activity; n, number; PAQLQ, Paediatric Asthma Quality Of Life Questionnaire; VO2max, maximal oxygen uptake in mL/kg/min.