The subjects cycled for 30 sec on each test
occasion before the measurements were performed.
A metronome was used to enable each
subject to find and keep the correct pedaling rate.
The subjects were filmed during 5 sec intervals.
Three of the five revolutions registered were selected
and analyzed throughout the complete pedal
revolution. The film was analyzed with a projector
(Analector ANL4), which made it possible
to "freeze" the film and trace the picture. Pictures
were traced from the cine-film at intervals of approximately
15O crank angle. The position for the
hip, knee, and ankle joint axes and crank angle
were then determined using the traced pictures
(Fig. 1). The joint angles were measured from the
drawn pictures. The testlretest error in joint angle