Table 2 Outcome measures

 Health-related quality of life score: PedsQL self-questionnaire (versions 5–7 years and 8–12 years for children and version 13–17 years for adolescents)

Secondary outcomes

 Level of physical activity assessed by:

  The metabolic equivalent of task (MET) assessed by the ActiGraph GT3X accelerometer

  The Ricci and Gagnon physical activity questionnaire

  The EMAPS motivation questionnaire

 CPET variables:

  VO2_max (maximum oxygen uptake)

  VAT (ventilatory anaerobic threshold)

  VE/VCO2 slope (ventilarory efficiency)

  OUES (oxygen uptake efficiency slope)

  Maximum oxygen pulse (VO2_max/maximum heart rate)

 Health-related quality of life score: PedsQL proxy questionnaire (versions 5–7 years and 8–12 years for children and version 13–17 years for adolescents)