1st Joint ESMAC-GCMAS Meeting - Análise de Marcha

from 30-50%, very similar to walking.
Tibialis anterior had continuous activity in swing ending with a peak at 90%, just before heel
contact, Figure 1D. In walking the final peak is at heel contact and activity ends at 10% of
stance. The start of activity corresponds again with toe-off, but this is much later in walking.
EMG (μV)
EMG (μV)
140
120
100
80
60
40
20
vastus medialis
walk
run
0
0 50 100 150
% of stride
120
100
80
60
40
20
A B
soleus
walk
run
0
0 50 100 150
% of stride
EMG (μV)
EMG (μV)
100
90
80
70
60
50
40
30
20
10
0
0 50 100 150
% of stride
250
200
150
100
50
- 163 -
biceps femoris
tibialis anterior
walk
run
walk
run
0
0 50 100 150
% of stride
C D
Figure 1 Average EMG profiles of walking (dashed) and running (solid line) both at 2.25 m/s.
A Vastus medialis, B Biceps femoris, C Soleus, D Tibialis anterior. Scale is from 0 – 100 –
50%, to avoid a break at 100%. Vertical dotted lines: toe-off for running (37%) and walking
(57%).
Discussion
The muscles acting on hip and knee show in running largely the same EMG patterns as in
walking. Major differences are seen in the muscles around the ankle. The calf group shows an
earlier stance activity, well adapted to the much shorter stance phase. This extensor activity is
largely simultaneous with massive activity in vasti (knee extensors) and glutei (hip extensors).
Tibialis anterior adapts its period of activity to the longer swing phase. The main results are in
good agreement with earlier work by Nilsson et al.[2].
References
[1] Hof, A. L. et al. (2002), Gait & Posture, 16: 78-86
[2] Nilsson, J. et al. (1985), Acta Physiol Scand .,123: 457-475