Your therapist can tell you what this means to changes in your stroke protocol.
http://www.jelectromyographykinesiology.com/article/S1050-6411%2813%2900171-5/abstract
Abstract
Purpose
This study was designed to evaluate
the effects of botulinum toxin type-A (BoNTA) injection of the rectus
femoris (RF) muscle on the electromyographic activity of the knee flexor
and extensor and on knee and hip kinematics during gait in patients
with hemiparesis exhibiting a stiff-knee gait.
Method
Two
gait analyses were performed on fourteen patients: before and four weeks
after BoNTA injection. Spatiotemporal, kinematic and electromyographic
parameters were quantified for the paretic limb.
Results
BoNTA
treatment improved gait velocity, stride length and cadence with an
increase of knee angular velocity at toe-off and maximal knee flexion in
the swing phase. Amplitude and activation time of the RF and
co-activation duration between the RF and biceps femoris were
significantly decreased. The instantaneous mean frequency of RF was
predominantly lower in the pre-swing phase.
Conclusions
The
results clearly show that BoNTA modified the EMG amplitude and
frequency of the injected muscle (RF) but not of the synergist and
antagonist muscles. The reduction in RF activation frequency could be
related to increased activity of slow fibers. The frequency analysis of
EMG signals during gait appears to be a relevant method for the
evaluation of the effects of BoNTA in the injected muscle.
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