The reaching test was conducted with suppor tatthoracic and
pelvic levels for every session.The support at the thoracic level
was placed below the scapular girdle,and the pelvic level of sup-
port was surrounding the pelvis,corresponding to the middle
thoracic level and lower lumbar level of the SATCo,respectively.
The design of the study was counterbalanced for the first session
and was evaluated using the same order throughout the longi-tudinal process for each infant,with half the infants first being provided with thoracic support,and half first being provided
with pelvic support,to eliminate fatigue or training effects as
confounding variables