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Pumping a playground swing.

Auke A Post1, Gert de Groot, Andreas Daffertshofer

  • 1Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Amsterdam, The Netherlands.

Motor Control
|June 19, 2007
PubMed
Summary
This summary is machine-generated.

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Driven oscillation is the primary method for pumping a playground swing, with parametric pumping playing a smaller role. The contribution of driven oscillation decreases as swing amplitude increases.

Area of Science:

  • Biomechanics
  • Physics of motion

Background:

  • Pumping a swing involves energy insertion through two primary mechanisms: parametric pumping and driven oscillation.
  • Parametric pumping involves vertical motion of the center of mass (CM), while driven oscillation involves rotational motion of the CM.

Purpose of the Study:

  • To investigate the relative contributions of parametric pumping and driven oscillation in initiating and sustaining swing motion.
  • To analyze the dynamics of the swing-swinger system in the sagittal plane.

Main Methods:

  • 18 participants were recruited to pump a swing from a standstill.
  • Motion capture technology with eight markers analyzed the swing-swinger system in the sagittal plane.
  • Principal component analysis and correlation analysis were used to determine motion patterns and couplings.

Related Experiment Videos

Main Results:

  • Driven oscillation was the dominant mechanism for energy insertion, with parametric pumping playing a subordinate role.
  • The relative contribution of driven oscillation decreased as swing amplitude increased.
  • Parametric pumping's contribution slightly increased with amplitude.
  • Swing motion determined up to 95% of the coordination pattern.
  • Trunk and leg rotations showed strong coupling within the remaining variance.

Conclusions:

  • Driven oscillation is the principal method for pumping swings, particularly at lower amplitudes.
  • Parametric pumping becomes more relevant at higher swing amplitudes.
  • The swing's inherent motion largely dictates the system's coordination, with significant coupling between trunk and leg movements.