Construction of gait adaptation model in human splitbelt treadmill walking

摘要

There are a huge number of studies that measure kinematics, dynamics, the oxygen uptake and so on in human walking onthe treadmill. Especially in walking on the splitbelt treadmill where the speed of the right and left belt is different, remarkabledifferences in kinematics are seen between normal and cerebellar disease subjects. In order to construct the gait adaptationmodel of such human splitbelt treadmill walking, we proposed a simple control model and made a newly developed 2D bipedrobot walk on the splitbelt treadmill. We combined the conventional limit-cycle based control consisting of joint PD-control,cyclic motion trajectory planning and a stepping reflex with a newly proposed adjustment of P-gain at the hip joint of thestance leg. We showed that the data of robot (normal subject model and cerebellum disease subject model) experimentshad high similarities with the data of normal subjects and cerebellum disease subjects experiments carried out by Reismanet al. (2005) and Morton and Bastian (2006) in ratios and patterns. We also showed that P-gain at the hip joint of the stanceleg was the control parameter of adaptation for symmetric gaits in splitbelt walking and P-gain adjustment corresponded tomuscle stiffness adjustment by the cerebellum. Consequently, we successfully proposed the gait adaptation model in humansplitbelt treadmill walking and confirmed the validity of our hypotheses and the proposed model using the biped robot.