http://jneuroengrehab.biomedcentral.com/articles/10.1186/s12984-017-0244-z
- Klaske van KammenEmail authorView ORCID ID profile,
- Anne M. Boonstra,
- Lucas H. V. van der Woude,
- Heleen A. Reinders-Messelink and
- Rob den Otter
Journal of NeuroEngineering and Rehabilitation201714:32
DOI: 10.1186/s12984-017-0244-z
© The Author(s). 2017
Received: 24 December 2016
Accepted: 13 April 2017
Published: 20 April 2017
Abstract
Background
The Lokomat is a robotic
exoskeleton that can be used to train gait function in hemiparetic
stroke. To purposefully employ the Lokomat for training, it is important
to understand (1) how Lokomat guided walking affects muscle activity
following stroke and how these effects differ between patients and
healthy walkers, (2) how abnormalities in the muscle activity of
patients are modulated through Lokomat guided gait, and (3) how temporal
step characteristics of patients were modulated during Lokomat guided
walking.
Methods
Ten hemiparetic stroke
patients (>3 months post-stroke) and ten healthy age-matched controls
walked on the treadmill and in the Lokomat (guidance force 50%, no
bodyweight support) at matched speeds (0.56 m/s). Electromyography was
used to record the activity of Gluteus Medius, Biceps Femoris, Vastus
Lateralis, Medial Gastrocnemius and Tibialis Anterior, bilaterally in
patients and of the dominant leg in healthy walkers. Pressure sensors
placed in the footwear were used to determine relative durations of the
first double support and the single support phases.
Results
Overall, Lokomat guided
walking was associated with a general lowering of muscle activity
compared to treadmill walking, in patients as well as healthy walkers.
The nature of these effects differed between groups for specific
muscles, in that reductions in patients were larger if muscles were
overly active during treadmill walking (unaffected Biceps Femoris and
Gluteus Medius, affected Biceps Femoris and Vastus Lateralis), and
smaller if activity was already abnormally low (affected Medial
Gastrocnemius). Also, Lokomat guided walking was associated with a
decrease in asymmetry in the relative duration of the single support
phase.
Conclusions
In stroke patients, Lokomat
guided walking results in a general reduction of muscle activity, that
affects epochs of overactivity and epochs of reduced activity in a
similar fashion. These findings should be taken into account when
considering the clinical potential of the Lokomat training environment
in stroke, and may inform further developments in the design of robotic
gait trainers.
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