Article

Mechanical sit-to-stand devices assist patient transfers and help protect against
work-related injuries in rehabilitation environments. However, observational
differences between patient's movements within devices compared to normal
sit-to-stand transfers deter clinician use. This study compared kinematics and
muscle demands during sit-to-stand transfers with no device (ND), and
device-assisted during which participants exerted no effort (DA-NE) and best
effort (DA-BE). Coefficient of multiple correlations (CMCs) compared kinematic
profiles during each device-assisted condition to ND. Compared to DA-NE, CMCs
were higher during DA-BE at the hip, knee, and ankle. However, DA-BE values were
lower than DA-NE at the trunk and pelvis due to the device's mechanical
constraints. In general, all joints' final DA-NE postures were more flexed than
other conditions. Electromyographic was significantly lower during DA-NE compared
to ND for all muscles except lateral hamstring, and during DA-BE compared to ND
for gluteus maximus, gastrocnemius, and soleus. Verbal encouragement (DA-BE)
significantly increased medial hamstring, vastus lateralis, gastrocnemius, soleus
and tibialis anterior activation compared to DA-NE. In conclusion,
device-assisted sit-to-stand movements differed from normal sit-to-stand
patterns. Verbally encouraging best effort during device-assisted transfers
elevated select lower extremity muscle activation and led to greater similarity
in hip, knee and ankle movement profiles. However, trunk and pelvis profiles
declined.
CI - Copyright (c) 2012 Elsevier B.V. All rights reserved.
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