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Spasticity can be in the form of the clasp-knife response, in which there is increased resistance only at the beginning or at the end of the movement. Rigidity can be of the leadpipe type, in which there is resistance throughout to passive movement, or it may be of cogwheel type, in which the resistance to passive movement is in a jerky manner.
Clasp-knife response refers to a Golgi tendon reflex with a rapid decrease in resistance when attempting to flex a joint, usually during a neurological examination. It is one of the characteristic responses of an upper motor neuron lesion .
Hypertonia is a term sometimes used synonymously with spasticity and rigidity in the literature surrounding damage to the central nervous system, namely upper motor neuron lesions. [1] Impaired ability of damaged motor neurons to regulate descending pathways gives rise to disordered spinal reflexes , increased excitability of muscle spindles ...
Leadpipe rigidity is sustained resistance to passive movement throughout the whole range of motion, with no fluctuations. Cogwheel rigidity is jerky resistance to passive movement as muscles tense and relax. Spasticity, a special form of rigidity, is present only at the start of passive movement. It is rate-dependent and only elicited upon a ...
Spasticity can be differentiated from rigidity with the help of simple clinical examination, as rigidity is a uniform increase in the tone of agonist and antagonist muscles which is not related to the velocity at which the movement is performed passively and remains the same throughout the range of movement while spasticity is a velocity ...
If, say, by Friday, it looks like you are coming close to exceeding your goal amount, you could work to cut back over the weekend. You could also plan ahead. If you know that next weekend, there ...
The production of the Royal Navy’s future hi-tech frigates has reached a “significant milestone” as steel was cut on the third vessel. All five of the Type 31 warships will be built in ...
Rigidity of the machine and tooling setup (ability to withstand vibration or chatter). Strength of the workpiece (high feed rates will collapse thin wall tubing) Characteristics of the material being cut, chip flow depends on material type and feed rate. The ideal chip shape is small and breaks free early, carrying heat away from the tool and work.