Study. ch 6 RESNA ATP Exam - The Biomechanics of Seating Questions and Answers Already Passed
Center of Gravity - The point on a person's body where their mass is concentrated in relationship to how he is positioned in space. In sitting, shifts forward from sacrum to naval (approximately) Muscles involved in sitting - Back, Abdominal, Intercostal Muscles (between ribs) and muscles around hips & pelvis use resting contractures to maintain upright position against gravity Movement occurs when - muscles on one side of a joint contract while muscles on the other side of the joint relax. Joints must have sufficient flexibility and muscles must have sufficient stretch Posterior Pelvic Tilt - Rotation of the pelvic back such that the ASIS is higher than the PSIS in the sagittal plane. One of the most common abnormal postures seen in seating Posterior Pelvic Tilt with Thoracic Kyphosis - If a person is in posterior pelvic tilt and has normal head righting reactions, the trunk will curve forward and neck may hyperextend in thoracic kyphosis in order to achieve upright head position and level field of vision
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