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- W2000696884 abstract "INTRODUCTION To investigate the control of upright standing posture, mechanical perturbation that disturbs the position of the center of the body mass and elicit its linear motion have been used [1]. It remains unstudied how standing posture is adjusted to rotational perturbation of the trunk, although such perturbation occurs during rapid asymmetrical movements of the arms [2, 3]. We determined postural adjustments to forced rotation of the trunk using a motor. METHODS Seven healthy subjects while standing were perturbed by rotating the upper trunk clockwise (cw) in a vertical axis. A motor fixed on the ceiling pushed the right (Rt) chest and left (Lt) back of the subjects through each vertical rod (Fig. 1). They were instructed to keep the posture (Keep), to resist the perturbation (Resist), and to ‘let go’ and not to respond it (Let-go). The perturbation torque was medium amplitude with 200ms duration. Further, they were perturbed under the Keep condition by two amplitude torques (large and small) with 200ms duration and by the medium-amplitude torque with two durations (100ms and 300ms). The motor torque and movement of the rod were recorded by a strain gauge and accelerometer, respectively. Rotational movements of the shoulder and hip were recorded bilaterally by accelerometers. The platform torque around a vertical axis was measured. Surface EMGs were recorded bilaterally from the trunk and leg muscles." @default.
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- W2000696884 date "2007-01-01" @default.
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- W2000696884 title "ADJUSTMENTS OF UPRIGHT STANDING POSTURE TO ROTATIONAL PERTURBATION OF THE TRUNK" @default.
- W2000696884 doi "https://doi.org/10.1016/s0021-9290(07)70689-9" @default.
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