Highlights
- •Shoe mileage is an important factor that influences the risk of sustaining injuries.
- •Findings indicated lower shoe stiffness at baseline compared to posttest.
- •The changes in ground reaction forces are more prominent in genu varus than control.
- •Rectus femoris activity was higher during loading phase in pretest than posttest.
Abstract
Background
Shoe mileage is an important factor that may influence the risk of sustaining injuries
during walking. The aims of this study were to examine the effects of shoe mileage
on ground reaction forces and activity of lower limb muscles during walking in genu
varus individuals compared with controls.
Methods
Fifteen healthy and 15 genu varus females received a new pair of running shoes. They
were asked to wear these shoes over 6 months. Pre and post intervention, mechanical
shoe testing was conducted and ground reaction forces and muscle activities of the
right leg were recorded during walking at preferred gait speed.
Findings
Significant group-by-time interactions were found for shoe stiffness, antero-posterior
and vertical impact peak. We observed higher shoe stiffness and lower impact peaks
after intervention in both groups with larger effect sizes in genu varus. Significant
group-by-time interactions were identified for vastus medialis (loading phase) and
rectus femoris (loading and push-off). For vastus medialis, significant decreases
were found from pre-to-post during the loading phase in the control group. Rectus
femoris activity was higher post intervention during the loading and push-off phases
in both groups with larger effect sizes in genu varus.
Interpretation
Our findings indicate that the observed changes in ground reaction forces are more
prominent in genu varus individuals. Together with our findings on shoe stiffness,
it seems appropriate to change running shoes after an intense wearing time of 6 months,
particularly in genu varus individuals.
Keywords
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Article Info
Publication History
Published online: January 13, 2020
Accepted:
January 8,
2020
Received:
November 6,
2019
Identification
Copyright
© 2020 Elsevier Ltd. All rights reserved.
