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- W2104814754 abstract "The interaction between primary movements and associated postural adjustments was studied during trunk extension movements in standing man. Six healthy male subjects performed one series of six consecutive fast trunk extensions. Movements were recorded with an optoelectronic system (Selspot). Angular displacements, velocities and accelerations at the ankle, knee, hip and trunk were calculated. Trunk inclination was measured as the sum of pelvic tilt and spine flexion. The spatial and temporal coordination patterns chosen by the subjects to complete the task were compared. The self-selected trunk movement amplitude ranged 14–30° for all subjects. The individual amplitude was maintained within 4–7° over the six consecutive trials. Peak velocity of the primary trunk movement was highly correlated with movement amplitude (r= 0.73, P < 0.01), whereas peak acceleration was not. Trunk extension, was the result of a simultaneous backward pelvic tilt and spine extension, together with hip extension and knee flexion. Knee flexion became increasingly important at larger movement amplitudes since hip extension as well as spine extension was limited. Associated postural adjustments occurred mainly as ankle flexion. In conclusion, individuals can accurately reproduce the multi-joint co-ordination pattern seen during a voluntary trunk extension movement. Movements at the ankle appear to be controlled to counteract the backward shift of the centre of gravity caused by the primary movement. Knee and ankle movements seem to be independently controlled in the preparatory phase, whereas they are closely linked later during the primary movement. It is suggested that the interaction between knee and ankle movements is necessary for optimal equilibrium control during trunk extension movements in standing." @default.
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- W2104814754 date "1988-09-01" @default.
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- W2104814754 title "Co-ordination of a simple voluntary multi-joint movement with postural demands: Trunk extension in standing man" @default.
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- W2104814754 doi "https://doi.org/10.1111/j.1748-1716.1988.tb08466.x" @default.
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