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Thesis Presentation Draft

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by

Leanri van Pletsen

on 17 April 2014

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Transcript of Thesis Presentation Draft

The effect of fatigue on barefoot running in habitual shod runners
Leanri van Pletsen,
BSc (Med.) Hons Biokinetics

Ross Tucker, PhD
Nicholas Tam,
MSc (Med.) Exercise Science

Footstrikes
Kinetics
Sagittal Plane Kinematics
Background
Methods
2% Faster than familiarization
Average of 18.9 RPE 10km
Ensure induce fatigue
PROTOCOL
Aim to test:
Fatigue
BF
Shod
200m
200m
4.6km
9.6km
60-80% Runners
$2.36 Billion
Barefoot running trend
Ground reaction force
Loading rate
EMG
Pre fatigue
Post fatigue
I
n
d
i
v
i
d
u
a
l
v
a
r
i
a
b
i
l
i
t
y
Fatigue run
Pre
Post
Tib Ant
Lat Gastroc
Bicep Fem
Vas Lat
Similar overall trends
Conclusion
Other findings
Ankle dorsiflexion increased in shodLoading rate higher BF
The barefoot effect
The fatigue effect
*
GRF lower post fatigue
p < 0.05
Pre
Post
More dorsiflexed when shod (p < 0.005)
Pre
Post
2
8
Pre
Post
Pre
Post
Pre
Post
Loading rate lower in shoes
p < 0.05
Pre activation (100 ms) Ground contact phase
Statistical Analysis
Mean ± SD
Repeated
measures
ANOVA
p < 0.05
EMG normalised
to average
Number of participants (n)
Barefoot running is associated with certain kinematic, kinetic and muscle activation changes in habitual shod runners as expected.
Acute fatigue over 10km causes specific kinematic, kinetic and muscle activation changes in both the shod and barefoot condition
n =
THANK YOU
QUESTIONS...
PRE ACT
GROUND
Vastus Lateralis
Biceps Femoris
Tibialis Anterior
Lateral Gastrocnemius
Pre activation with fatigue (*)
Shod vs BF
331.8 g
EMG
Full transcript