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Changing Posture Disc Force

Outline. Lower Back: Lumbar Disc ForceLower Back: Muscle ActivityShoulders and LegsDesign Considerations for Seating. Weight Transfer Main body weight transferred to seat. Some transferred to floor, backrest, and armrests.Advantages provides stability to tasks involving visual and motor control less energy consuming than standing places less stress on lower extremity joints lessens pressure on lower extremity circulation.

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Changing Posture Disc Force

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    15. Changing Posture & Disc Force studies show increased low back pain (LBP) risk for people required to sit or stand for prolonged periods of time (Grieco, 1986) best to change work posture and/or occupational task frequently to prevent “postural fixity” (Magora, 1972) Center for Disease Control (U.S.) 1980 tips: 10-15 minute breaks for every 2 hours seated work

    23. The Legs and Sitting Foot support affects circulation Pressure applied close on thighs close to the knees leg swelling ==> pressure on sciatic nerve should not feel edges of the chair Semi-seated position ==> eases transition to standing but increased lower extremity stress

    26. Posture

    27. Design Considerations GOAL: function, comfort, user friendliness, minimizing spinal disc forces Lumbar Support: use backrest that has lumbar support allowing for spinal curvature similar to standing Leg Position: movement of pelvis caused by different positioning of knees and hips, e.g. car seats vs. office chairs Seat Design: tilted seats, contoured or cushioned support to ideally position pelvis, use of armrest, adjustability, seat width, height, & depth Desk Design: bottom height, top height, inclination of surface, work surface size, surface friction (Human Factors Society, 1988)

    34. Ideal Typing Posture Check the website below for more diagrams of how you should be sitting while keyboarding http://www.metamorphosis.com/Upright/index.html

    36. Be conscious of keyboarding posture, but don’t be extreme in your posture correction!

    38. Ways To Relieve Back Pain

    41. Sources 1 Andersson et al., “Lumbar disc pressure and myoelectric back muscle activity during sitting: I: studies on an experimental chair”, Scan. J. Rehab. Med., 3:104-114, 1974a. Andersson et al., “Lumbar disc pressure and myoelectric back muscle activity during sitting: II: studies on an office chair”, Scan. J. Rehab. Med., 3:115-121, 1974b. Andersson and Ortengren, “Myoelectric back muscle activity during sitting”, Scand.J.Rehab.Med., Supplement 3:73-90, 1974. Bendix et al., “Comparison of office chairs with fixed forwards and backwards inclining or tiltable seats”, Eur.J.Appl.Physiol., 54:378-385, 1985. Chaffin et al., Occupational Biomechanics, 1999. Engdahl, “Specification for office furniture”, In: B.Jonsson, Sitting Work Postures, (in Swedish) 1978.

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