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Rigidity is a nonselective increase in the tone of agonist and antagonist without velocity dependence, and the increased tone remains uniform throughout the range of movement. On the contrary, spasticity is a velocity-dependent increase in tone resulting from the hyper excitability of stretch reflexes. [ 7 ]
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 ...
Both the extensor and flexor muscles are involved in the maintenance of a constant tone while at rest. In skeletal muscles, this helps maintain a normal posture. Resting muscle tone varies along a bell-shaped curve. Low tone is perceived as "lax, flabby, floppy, mushy, dead weight" and high tone is perceived as "tight, light, strong".
altered muscle tone (hypotonia or hypertonia) – a decrease or increase in the baseline level of muscle activity; decreased endurance; exaggerated deep tendon reflexes including spasticity, and clonus (a series of involuntary rapid muscle contractions) Such signs are collectively termed the "upper motor neuron syndrome".
In medicine, the adjective spastic refers to an alteration in muscle tone affected by the medical condition spasticity, which is a well-known symptomatic phenomenon seen in patients with a wide range of central neurological disorders, including spinal cord injury, cerebral palsy (for example, spastic diplegia), stroke, amyotrophic lateral sclerosis (ALS), and multiple sclerosis (MS), [1] as ...
Changes in muscle performance can be broadly described as the upper motor neuron syndrome. These changes vary depending on the site and the extent of the lesion, and may include: Muscle weakness. [2] known as 'pyramidal weakness' Sloth sign. Decreased control of active movement, particularly slowness; Spasticity, a velocity-dependent change in ...
Changes in spasticity and corresponding postures may also occur with other brain activity, such as excitement, fear or anxiety, or even pain, which increase muscle tension. [ citation needed ] A person with spastic CP will commonly show, in addition to higher muscle tone, persistent primitive reflexes , greater stretch reflexes , plantar reflex ...
Spastic diplegia is a form of cerebral palsy (CP) that primarily affects the legs, with possible considerable asymmetry between the two sides. It is a chronic neuromuscular condition of hypertonia and spasticity in the muscles of the lower extremities of the human body, manifested as an especially high and constant "tightness" or "stiffness", [1] [2] usually in the legs, hips and pelvis.