The symmetry angle identifies less clinically relevant inter-limb asymmetries than the symmetry index in healthy adults

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There are several methods for calculating inter-limb symmetry, an inter-limb difference ≥15% has been suggested as an indicator of sporting injury risk. The purpose of this study was to compare three common methods for determining symmetry: the Symmetry Index (percentage difference; SI) when referenced to the left limb (SILeft) or the average of both limbs (SIAverage), and the Symmetry Angle (vector difference; SA). 15 recreationally active participants completed a sprint protocol on a non-motorised treadmill. Accelerometers were positioned on both tibias to measure peak resultant acceleration (PRA). The SA identified less clinically relevant PRA inter-limb asymmetries than the SI in healthy adults. Once an appropriate level of asymmetry as measured by the SA is determined, this may help to more correctly identify asymmetry in athletes and patients than the SI.
Original languageEnglish
Article number141
Pages (from-to)622-625
Number of pages4
JournalInternational Society of Biomechanics in Sports Proceedings Archive
Issue number1
Publication statusPublished - 2018
Event36th Conference of the International Society of Biomechanics in Sports, ISBS 2018 - Auckland, New Zealand
Duration: 10 Sep 201814 Sep 2018



  • accelerometer
  • non-motorised treadmill
  • inertial measurement unit

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