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Visual properties of objects affect manipulative forces and respiration differently.

Eric M Lamberg1, Jason H Mateika, Andrew M Gordon

  • 1Department of Biobehavioral Sciences, Teachers College, Columbia University, New York, NY 10027, USA. eric.lamberg@sunysb.edu

Brain Research
|December 13, 2005
PubMed
Summary

Motor and respiratory systems respond differently to lifting objects. Visual cues influence motor responses, while respiratory responses may prioritize trunk stabilization, particularly with consecutive lifts.

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Area of Science:

  • Biomechanics
  • Motor Control
  • Respiratory Physiology

Background:

  • The motor and respiratory systems exhibit distinct responses to lifting objects of altered weight without visual cues.
  • Previous findings indicated respiratory system responses defaulted to heavier object lifting patterns, potentially due to a lack of visual size information.

Purpose of the Study:

  • To investigate the influence of visual size cues on motor and respiratory system responses during object lifting.
  • To determine if covaried size and weight of objects, providing predictable lift information, alter these responses.

Main Methods:

  • 14 seated subjects performed self-initiated alternating lifts with objects where size and weight covaried.
  • Load force and lung volume responses were measured following consecutive and alternating lifting trials.

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Main Results:

  • Load force scaled with object weight in both consecutive and alternating trials, suggesting reliance on visual information.
  • Lung volume scaled with object weight only in consecutive trials, indicating it was not solely driven by visual cues.
  • Lung volume increased with object weight during consecutive trials, potentially aiding trunk stabilization via intra-abdominal pressure.

Conclusions:

  • Motor system load force scaling is primarily driven by visual information.
  • Respiratory system's lung volume response is influenced by factors beyond immediate visual cues, possibly related to postural control.
  • Covarying object size and weight influences motor and respiratory responses differently, with visual cues playing a key role in motor adjustments.