Kinematic and electromyographic analyses of normal and device-assisted sit-to-stand transfers

Gait Posture. 2012 Jul;36(3):516-22. doi: 10.1016/j.gaitpost.2012.05.002. Epub 2012 Jun 22.


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.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Ankle Joint / physiology
  • Biomechanical Phenomena
  • Electromyography / methods
  • Energy Metabolism
  • Female
  • Hip Joint / physiology
  • Humans
  • Knee Joint / physiology
  • Male
  • Movement
  • Moving and Lifting Patients
  • Muscle, Skeletal / physiology*
  • Occupational Injuries / prevention & control
  • Posture / physiology*
  • Range of Motion, Articular / physiology*
  • Reference Values
  • Sampling Studies
  • Self-Help Devices / statistics & numerical data*