The effect of timing of a perturbation on the execution of an lifting movement

J.C.E. van der Burg, J.H. van Dieen

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    Anticipation to the mass magnitude is important in lifting, but underestimation of a mass, in contrast to overestimation, does not cause major movement disturbances. This may be caused by corrections in muscle activity before the object is actually lifted. This study was designed to assess the importance of these corrections during the loading phase for the execution of a lifting movement when the mass is underestimated. Ten subjects lifted a box (1.6 kg), of which the mass was increased by 10 kg without them knowing so. The mass was added either before the box had been lifted from the ground (perturbation before lift-off, PBL) or right perturbation after lift-off (PAL). In the PBL condition back muscle activity was increased before lift-off. Even though this early corrective response could obviously not occur in the PAL condition, the lifting movement was executed without clear problems. In sum, corrections in muscle activity before lift-off are not necessary for adequate correction of a perturbation induced by an unexpected heavier object. © 2001 Elsevier Science B.V.
    Original languageEnglish
    Pages (from-to)243-255
    JournalHuman Movement Science
    Volume20
    DOIs
    Publication statusPublished - 2001

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