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Bilateral Differences in Dancers' Dynamic Postural Stability During Jump Landings.

Frances Clarke1, Yiannis Koutedakis2, Margaret Wilson3

  • 1National Institute of Dance Medicine and Science, and Trinity Laban Conservatoire of Music & Dance, London, United Kingdom;,

Journal of Dance Medicine & Science : Official Publication of the International Association for Dance Medicine & Science
|November 21, 2020
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Summary

Dance training may not cause harmful leg imbalances. This study found no significant differences in postural stability during jump landings between dancers' right and left legs, suggesting injury risk is not increased by potential training bias.

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Area of Science:

  • Dance Science
  • Biomechanics
  • Sports Medicine

Background:

  • Traditional dance training may inadvertently create lateral bias due to one-sided exercise repetition.
  • Such imbalances are hypothesized to increase injury risk, particularly during dynamic actions like jump landings.
  • Limited research exists on how bilateral differences affect dancers' postural stability during these critical movements.

Purpose of the Study:

  • To investigate the impact of potential leg dominance on dynamic postural stability during single-leg jump landings in dancers.
  • To analyze differences in postural control between the right and left legs using a time-to-stabilization protocol.

Main Methods:

  • Thirty-two female university dancers performed a jump-to-single-leg landing task over a bar onto a force platform.
  • The landing leg was randomized, with three trials completed for each leg.
  • Dynamic postural stability was assessed using a time-to-stabilization protocol, measuring metrics like MLSI, APSI, VSI, and DPSI.

Main Results:

  • No statistically significant differences were found in dynamic postural stability between the right and left landing legs (p > 0.05).
  • Effect sizes for all measured stability parameters were small, indicating minimal practical differences.
  • Dancers' perceived leg dominance did not correlate with their single-leg landing balance or ability to absorb impact forces.

Conclusions:

  • The study's findings do not support the hypothesis that dance training leads to detrimental lateral bias affecting postural stability.
  • Potential training-induced leg imbalances may not significantly increase injury risk related to jump landings.
  • Dancers' self-perceived leg dominance is not a reliable indicator of their dynamic postural stability during single-leg landings.