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Object size effects on initial lifting forces under microgravity conditions.

I Kingma1, G J Savelsbergh, H M Tousaint

  • 1Institute for Fundamental and Clinical Movement Sciences, Faculty of Human Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands. I_KINGMA@FBW.VU.NL

Experimental Brain Research
|March 25, 1999
PubMed
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The size-weight illusion, where larger objects feel lighter, persists even in microgravity. This suggests that the initial effort to lift larger objects is mainly due to acceleration, not weight.

Area of Science:

  • Human Perception and Motor Control
  • Biomechanics
  • Gravitational Physiology

Background:

  • The size-weight illusion describes the perception that objects of equal mass but different volumes are experienced as having different weights.
  • This century-old phenomenon is associated with increased initial lifting forces and acceleration for larger objects.
  • The underlying mechanisms, particularly the role of gravity, remain incompletely understood.

Purpose of the Study:

  • To investigate whether the elevated initial lifting effort for larger objects persists under microgravity conditions.
  • To differentiate between weight-dependent and acceleration-dependent components of the lifting effort.
  • To elucidate the contribution of gravitational forces to the size-weight illusion.

Main Methods:

Related Experiment Videos

  • A lifting experiment was conducted during parabolic flights to induce brief periods of microgravity.
  • Subjects performed whole-body lifting movements with two 8-kg boxes of differing volumes, aware of their equal mass.
  • Initial lifting forces and accelerations were measured and compared between normal and microgravity conditions.

    • Main Results:

    • Peak lifting forces decreased significantly (approx. factor 9) in microgravity, indicating rapid adaptation to reduced weight.
    • Despite decreased overall movement speed, initial acceleration of the larger box remained significantly higher in microgravity (1.87 m/s²) compared to the smaller box (1.47 m/s²).
    • A similar trend was observed for initial lifting forces, though not statistically significant in microgravity alone.

    Conclusions:

    • The elevated initial lifting effort for larger objects is maintained during short-term exposure to microgravity.
    • This finding supports the hypothesis that the force component required to accelerate the object significantly contributes to the size-weight illusion under normal gravity.
    • The study highlights the role of inertial forces, rather than solely weight perception, in explaining the size-weight illusion.