Table 1.

Inclusion and exclusion criteria study 1

Inclusion criteria	Exclusion criteria
A DNA-established diagnosis of DMD	Other disabling diseases influencing mobility
Boys who are at the end of their ambulation phase, and: -need ≥5 sec. to get up from the floor or -are not able to get up from the floor or -are not able to bicycle without assistance -are dependent on a wheelchair to move over a long distance (>500 m)	Boys with a clinical symptomatic cardiomyopathy Boys <6 years old
Boys who recently became wheelchair-dependent (approximately 1-2 years after they stopped walking), and: -are able to touch the top of their head with both hands without assistance or -are not able to bicycle without assistance -are able to use a hand-operated wheelchair