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Biomechanical Analysis of the Sit-to-Stand Movement

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jackie woods

on 29 April 2014

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Transcript of Biomechanical Analysis of the Sit-to-Stand Movement

Biomechanics of the Sit-to-Stand Movement
Analysis


In sit to stand the center of mass must be moved forward to perform the movement. On the lateral view of the video you can seehow he flexes his trunk segment to gain horizontal momentum of the body mass, during the pre-extension phase.
The timing between horizontal movement of body mass and lower limb extension are important to perform the movement.
Phase 3 (Standing)
Movements
Anterior pelvic tilt
Trunk Extension
Hip Flexion
Transition Weight
Lift off
Hip Extension
Trunk Extension
Knee Extension
Phase 1
(Flexion Momentum)
This is used to start the initial momentum for rising
Ends just before the glutes are lifted from the seat of the chair
References
Engardt M, Olsson E. Body weight-bearing while rising and sitting down in patients with stroke. Scand J Rehabil Med.1992 ;24:67–74.
Roebroeck ME, Doorenbosch CA, Harlaar J, et al. Biomechanics and muscular activity during sit-to-stand transfer. Clin Biomech.1994 ;9:235–244
Kralj A, Jaeger RJ, Munih M. Analysis of standing up and sitting down in humans: definitions and normative data presentation. J Biomech.1990 ;23:1123–1138.
Kotake T, Dohi N, Kajiwara T, et al. An analysis of sit-to-stand movements. Arch Phys Med Rehabil.1993 ;74:1095–1099.
Newtons Third Law of Motion
What is STS?
"A movement in which the base of support is transferred from the seat to the feet".
Evaluates motor control and stability with functional limitations
Phase 2 (Rising)

is initiated just after maximum ankle dorsiflexion and ends when the hips first cease to extend
The hamstrings/Glutes allows the body to rise in a standing position.
Hamstrings flex the knee and extend the thigh
Glutes straighten out the hips while standing
Gastrocnemius, Soleus, Plantaris (calves muscles)
Stablizes leg while standing
Aids in flexion while sitting
When sitting on a chair it exerts force onto the chair then causing equal force to the body.
Allows you to push off of the chair and to use that energy to gain momentum to stand
Full transcript