postural control
Post on 09-Feb-2016
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Postural Control
Chapter 20
KINE 3301Biomechanics of Human Movement
The vestibular system measures linear and angular accelerations of the head.
The brain must evaluate visual, vestibular & somatosensory data to determine the accuracy of each and select an appropriate response to a postural challenge.
NeuroCom
Sensory Organization Test (SOT)
Sensory Organizational Theory
• The brain gathers somatosensory, vestibular & vision data to determine body orientation and equilibrium.
• The brain then evaluates available data to resolve an conflicting information and select an appropriate response.
• Somatosensory & vision are more sensitive to postural challenges then vestibular, but they are more likely to inaccurate or misleading information.
Reflex Latency of Postural Control Signals
Sensor Reflex LatencyMuscle Spindle 30 – 50 msGolgi Tendon Organ 50 – 80 msCutaneous Sensors 50 – 80 msJoint Pressure Sensors 50 – 80 msVestibular Sensors 40 – 80 ms
Postural Control & Fall Risk in the Elderly
• Muscular strength & vision decline with aging.• Flexibility also declines which adversely affects
corrective responses.• Bone mineral density and bone strength also
decline with aging.• Due to osteoporosis & osteoarthritis elderly
individuals can not tolerate “high intensity” training.
• Medications may also increase fall risk.
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