Article

Differential training has been shown to enhance motor learning in sports skills.
In the present study differential training was applied to the minimization of
postural sway. A differential training group performed 15 one minute practice
trials, each with different postural movement instructions. A repetitive practice
group performed 15 trials standing as still as possible for one minute. Pre- and
post-tests were performed standing as still as possible in 1 and 2-leg stance.
Accelerometry data were collected approximately at the level of the center of
mass (COM) and at the head. The root mean square jerk (RMSJ) of movement at the
COM and head was estimated for the anteroposterior and mediolateral axes of
motion. A significant Group x Test interaction revealed that the differential
training led to lower anteroposterior RMSJ on the post-test than on the Pre-test
in both the 1 and 2-leg stance tasks. A significant Group x Effector x Test
interaction revealed that the decrease in anteroposterior RMSJ with differential
training occurred in the RMSJ of the head but not the COM. The repetitive
practice did not lead to a significant change in anteroposterior RMSJ at either
the COM or the head. Neither form of training led to a significant change in
mediolateral RMSJ. The results indicated that differential training can enhance
motor learning not only in complex sports skills but in relatively simple motor
tasks such as maintaining quiet stance.
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