Many athletes and coaches believe that technique variations
occur in the squat as different stance widths are employed.
There are currently no known studies that have
quantified joint angles, moments, and moment arms while
performing the squat with varying stance widths. Therefore,
the objective of this study was to compare squat kinematics
and kinetics between 2-D and 3-D analyses among three
defined stance groups. The results from the current study
demonstrate that kinematic and kinetic differences do occur
among the three stance groups and that 2-D kinematic and
kinetic analyses produce erroneous results compared with
3-D analyses, especially during the WS.
In the current study, linear and angular displacements and
velocities, as well as joint moments and moment arms, were
averaged from the left and right sides of the body. There
were no significant differences between bilateral measurements,
which demonstrate the symmetrical nature of the
squat exercise. This implies that during the squat analyzing
only one side of the body may be adequate in calculating
joint and segment angles, joint moments, and joint moment
arms. The symmetrical nature of the deadlift, which is
similar to the squat, has previously been demonstrated by
Escamilla et al. (9), who found no significant differences in
kinematic and kinetic measurements between left and right
sides of the body.
Many athletes and coaches believe that technique variationsoccur in the squat as different stance widths are employed.There are currently no known studies that havequantified joint angles, moments, and moment arms whileperforming the squat with varying stance widths. Therefore,the objective of this study was to compare squat kinematicsand kinetics between 2-D and 3-D analyses among threedefined stance groups. The results from the current studydemonstrate that kinematic and kinetic differences do occuramong the three stance groups and that 2-D kinematic andkinetic analyses produce erroneous results compared with3-D analyses, especially during the WS.In the current study, linear and angular displacements andvelocities, as well as joint moments and moment arms, wereaveraged from the left and right sides of the body. Therewere no significant differences between bilateral measurements,which demonstrate the symmetrical nature of thesquat exercise. This implies that during the squat analyzingonly one side of the body may be adequate in calculatingjoint and segment angles, joint moments, and joint momentarms. The symmetrical nature of the deadlift, which issimilar to the squat, has previously been demonstrated byEscamilla et al. (9), who found no significant differences inkinematic and kinetic measurements between left and rightsides of the body.
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