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Coordination and variability during anticipated and unanticipated sidestepping.

Gillian Weir1, Richard van Emmerik2, Carl Jewell1

  • 1Biomechanics Laboratory, University of Massachusetts Amherst, United States.

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|September 25, 2018
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Summary

Understanding how athletes move during high-risk scenarios like unanticipated sidestepping is key to preventing anterior cruciate ligament (ACL) injuries. This study reveals increased coordination and variability in movements during these unpredictable events, highlighting the need for better training strategies.

Keywords:
Anterior cruciate ligamentDynamical systemsKneeTrunkVector coding

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Motor Control

Background:

  • Non-contact anterior cruciate ligament (ACL) injuries are a significant concern in sports.
  • Previous research often studied injury mechanisms in isolation.

Purpose of the Study:

  • To investigate differences in joint and segment coordination during anticipated versus unanticipated sidestepping using a dynamical systems approach.
  • To understand movement patterns linked to a high risk of ACL injuries.

Main Methods:

  • Collected 3D kinematic and knee kinetic data from 22 male collegiate soccer players.
  • Utilized a modified vector coding technique to quantify coordination and variability in trunk, pelvis, hip, and knee movements.
  • Analyzed movements during both anticipated and unanticipated sidestepping tasks.

Main Results:

  • Unanticipated sidestepping showed more in-phase coordination in the sagittal and frontal planes for trunk-pelvis movements.
  • Hip-knee coordination became more in-phase, with the knee dominating during unanticipated sidestepping.
  • Coordination variability increased significantly in multiple joint and segment pairings during unanticipated sidestepping.

Conclusions:

  • Movement coordination becomes more synchronized and its variability increases with task complexity and reduced planning time.
  • Injury prevention strategies should integrate perceptual training to improve postural adjustments and reduce knee joint loading during dynamic sporting actions.