HSBH3014 Lecture Notes - Lecture 6: Bursitis, Humidity, Erector Spinae Muscles
22 Aug 2018
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Work environment: vibrations, heat, cold, noise, light, chemical contaminants (fumes, pesticides, physical contaminants (particles, dust) Vibration general principles: vibrations = oscillations of a mass about a reference point. In humans: vibration is produced by regular or irregular movements of a body in contact with the human, contact can occur at a number of points. If your ankles and knees are relaxed, by the time the vibration gets to your torso it will be a lot less; but if knees are locked then vibration will be greater through body. Physiological effects: visual & psychomotor performance, driving, efficiency around 2-16 hz, dangerous at a = 2. 5 m s-2, errors a = 0. 5ms-2, energy expenditure hr, rr, restrict circulation, effect on muscle reflexes: Increased ee from vibration leads to decreased efficiency. Segmental vibration: degenerative symptoms in the bones, joints & tendons of the upper limbs, vibration in powered hand tools.
