Cycling skills assessment
Cycling performance was tested in a standardized cycle course with 7 tasks in the order specified (slalom, slow cycling, dismounting into a hula hoop and getting on the bicycle on both sides, cycling through a narrow alley, turning to the off-side, precise braking). Detailed description of the cycling course can be found in the published study protocol [The tasks of the cycle course represent specific cycling skills that were combined when possible. Therefore, the cycle course tasks slow cycling and cycling through a narrow alley were added to the cycling skill lane keeping. Dismounting and mounting on the bike were combined for each side. The cycle course task slalom represents the cycling skill riding curves. Taken together, six cycling skills were defined: riding curves, lane keeping, dismounting/mounting to the right and left side, turning to the left side and precise braking. Each cycling skill was dichotomized (error in the respective cycle course task yes/no) to reflect whether limitations are present or not.