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In occupational safety and health, hand arm vibrations (HAVs) are a specific type of occupational hazard which can lead to hand–arm vibration syndrome (HAVS). HAVS, also known as vibration white finger ( VWF ) or dead finger , [ 1 ] is a secondary form of Raynaud's syndrome , an industrial injury triggered by continuous use of vibrating hand ...
Crepitus is "a grating sound or sensation produced by friction between bone and cartilage or the fractured parts of a bone".. Various types of crepitus that can be heard in joint pathologies are:
A reflex from hearing a sudden loud noise will happen in the primary acoustic startle reflex pathway consisting of three main central synapses, or signals that travel through the brain. First, there is a synapse from the auditory nerve fibers in the ear to the cochlear root neurons (CRN).
Throat slash, made by moving one's index finger, thumb or entire hand, held straight and with palm down, horizontally across one's throat; the gesture imitates cutting a person's throat with a blade, indicating strong disapproval, extreme anger, or displeasure with others or with oneself; [13] alternatively, it can be a silent signal to stop ...
Neck creaking or cracking of the neck is a clicking sound caused by movements of the neck. It can be a normal joint cracking or caused by arthrosis . [ 1 ] [ 2 ]
The torsional deflection of a simple cylinder cannot radiate efficiently acoustic noise, but with particular boundary conditions the stator can radiate acoustic noise under torque ripple excitation. [8] Structure-borne noise can also be generated by torque ripple when rotor shaft line vibrations propagate to the frame [9] and shaft line.
Delayed onset Lhermitte's sign has been reported following head and/or neck trauma. [9] [10] This occurs ~2 1/2 months following injury, without associated neurological symptoms or pain, and typically resolves within 1 year. [citation needed]
Exposures and limits have been estimated in the ISO 5349-1 for hand-transmitted vibration. [3] A 2018 meta-analysis said that whole body vibration can improve bone mineral density in the lumbar spine of postmenopausal women as well as the femoral neck density of postmenopausal women younger than 65. [4]