Static Postures

OCCUPATIONAL HEALTH AND SAFETY MANAGEMENT A PRACTICAL APPROACH 

Cold temperatures refer to exposure to excessive cold while performing work tasks. Cold temperatures can reduce the dexterity and sensitivity of the hand. Cold temperatures, for example, cause the worker to apply more grip force to hold hand tools and objects. Also, prolonged contact with cold surfaces (e.g., handling cold meat) can impair dexterity and induce numbness. Cold is a problem when it is present with other risk factors and is especially problematic when it is present with vibration exposure. 

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Static posture low frequency (<2/minute) high frequency (22/mimite)... 

Static posture and high frequency movements (> 2 / minute), awkward and extreme positions of all upper extremity segments and joints... 

Static analysis requires consideration of forces and moments of force acting on the body at rest (static equilibrium). A magnitude of the moment of force at the point of rotation is equal to the product of force and the perpendicular distance from the force action line to that point. The moment (M) equals force (F) times moment arm (d), with unit of measurement (N-m). The static analysis ignores the effects of accelerations, momentum, and friction and is adequate only for analysis of static postures. 

Depending on the human performance tool, the postural information reqirired for an assessment may require a static posture at an instance in time, or multiple key postures at different times in the task. For example, the NIOSH lifting guide (NIOSH 1991) requires starting and ending postures of a lift to arrive at an assessment of the lift conditions. In contrast, analysis tools based on biomechanical models, such as low-back injury risk-assessment tools, can analyze loading conditions continuously for each posture throughout the simulation. 

Static postures or positions that a worker must hold for long periods of time can restrict blood flow and damage muscles ... 

Measuring Static Postural Loading on the Lumbar Spine... 

Park, W., Singh, D., Levy, M. Jung, E. 2009. Obesity effect on perceived postural stress during static posture maintenance tasks. Ergonomics iFirstarticle, 1-14. 

Force Vibration Repetition Contact stress Awkward postures Cold temperatures Static postures... 

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