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(A) Illustration of the bridge test which required the participants to place their feet on the pressure platform, while performing a bridge from the crook-lying position. (B) Typical example of center of pressure (COP) individual points during a 30-s trial, in the bridge test. (C) Typical example of anteroposterior and mediolateral COP displacement fluctuation, during a 30-s trial. (D) Typical example of COP velocity fluctuation during a 30-s trial.
