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

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Abstract

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.

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Extremities
Tibia
Athletes
Wounds and Injuries

Keywords

  • accelerometer
  • non-motorised treadmill
  • inertial measurement unit

Cite this

@article{57d2498a9bc34410ac7d06dbc335bd0f,
title = "The symmetry angle identifies less clinically relevant inter-limb asymmetries than the symmetry index in healthy adults",
abstract = "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.",
keywords = "accelerometer, non-motorised treadmill, inertial measurement unit",
author = "Glassbrook, {Daniel J.} and Fuller, {Joel T.} and Alderson, {Jacqueline A.} and Wills, {Jodie A.} and Doyle, {Tim L. A.}",
year = "2018",
language = "English",
volume = "36",
pages = "622--625",
journal = "International Society of Biomechanics in Sports Proceedings Archive",
issn = "1999-4168",
number = "1",

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TY - JOUR

T1 - The symmetry angle identifies less clinically relevant inter-limb asymmetries than the symmetry index in healthy adults

AU - Glassbrook, Daniel J.

AU - Fuller, Joel T.

AU - Alderson, Jacqueline A.

AU - Wills, Jodie A.

AU - Doyle, Tim L. A.

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - accelerometer

KW - non-motorised treadmill

KW - inertial measurement unit

M3 - Conference paper

VL - 36

SP - 622

EP - 625

JO - International Society of Biomechanics in Sports Proceedings Archive

T2 - International Society of Biomechanics in Sports Proceedings Archive

JF - International Society of Biomechanics in Sports Proceedings Archive

SN - 1999-4168

IS - 1

M1 - 141

ER -