Muscle length effect on the pendulum test.

OBJECTIVE An investigation of the effect of the length of knee extensor muscles on the pendulum test. DESIGN Descriptive. Statistical analysis utilized analysis of variance with planned comparisons. SETTING Community clubs and a stroke rehabilitation unit. PARTICIPANTS Twenty subjects aged 54 to 83 yrs, more than 6 weeks after stroke, and 31 healthy subjects aged 60 to 79 yrs. OUTCOME MEASURES Two tests: pendulum test and knee extensor muscle length test. RESULTS For both affected and intact legs, stroke subjects had significantly smaller angle of reversal (p < .001), peak angular velocity (p < .001), and maximum passive knee flexion (p < .001) than healthy subjects. When angle of reversal was normalized for passive knee flexion, there were no significant differences between healthy and stroke subjects. There were no significant differences in any variable between the intact and affected legs of the stroke subjects. CONCLUSION Soft tissue changes, rather than hyperreflexia, may explain the decreased angle of reversal and peak angular velocity in the stroke subjects studied.

[1]  V. Dietz,et al.  Tension development and muscle activation in the leg during gait in spastic hemiparesis: independence of muscle hypertonia and exaggerated stretch reflexes. , 1984, Journal of neurology, neurosurgery, and psychiatry.

[2]  Rc Roberts,et al.  A comparison of the assessment of spasticity by the Wartenberg pendulum test and the Ashworth grading scale in patients with multiple sclerosis , 1992 .

[3]  W. Rymer,et al.  A quantitative analysis of pendular motion of the lower leg in spastic human subjects , 1991, IEEE Transactions on Biomedical Engineering.

[4]  K H Mauritz,et al.  Chronic transformation of muscle in spasticity: a peripheral contribution to increased tone. , 1985, Journal of neurology, neurosurgery, and psychiatry.

[5]  J. Carr,et al.  Investigation of a new motor assessment scale for stroke patients. , 1985, Physical therapy.

[6]  W Z Rymer,et al.  Objective quantification of spastic hypertonia: correlation with clinical findings. , 1992, Archives of physical medicine and rehabilitation.

[7]  W. Rymer,et al.  Spastic hypertonia: mechanisms and measurement. , 1989, Archives of physical medicine and rehabilitation.

[8]  T. Bajd,et al.  Pendulum testing of spasticity. , 1984, Journal of biomedical engineering.

[9]  J. Carey,et al.  Movement dysfunction following central nervous system lesions: a problem of neurologic or muscular impairment? , 1993, Physical therapy.

[10]  B Stillman,et al.  A video-based version of the pendulum test: technique and normal response. , 1995, Archives of physical medicine and rehabilitation.

[11]  R WARTENBERG,et al.  Pendulousness of the Legs as a Diagnostic Test , 1951, Neurology.

[12]  J Quintern,et al.  Electrophysiological studies of gait in spasticity and rigidity. Evidence that altered mechanical properties of muscle contribute to hypertonia. , 1981, Brain : a journal of neurology.

[13]  M. Mcmurdo,et al.  Does the Wartenberg pendulum test differentiate quantitatively between spasticity and rigidity? A study in elderly stroke and Parkinsonian patients. , 1988, Journal of neurology, neurosurgery, and psychiatry.

[14]  G. Goldspink,et al.  Changes in sarcomere length and physiological properties in immobilized muscle. , 1978, Journal of anatomy.