OBJECTIVE: Quantify the enhancement of parkinsonian rigidity associated with a contralateral activation maneuver. METHODS: Twelve subjects with PD and eight controls participated in the study protocol. Subjects' tested hand was displaced by a servo-motor throughout wrist flexion and extension motions of 60° without and with a concurrent gripping activation in the contralateral hand, referred to as Passive and Active conditions, respectively. Subjects with PD were tested in both OFF-MED and ON-MED states. Rigidity was quantified by integrating torque with position during both flexion and extension (torque resistance). ANOVA was performed to assess the effect of contralateral activation on rigidity. RESULTS: PD patients had significantly (0.038) enhanced torque resistance in OFF-MED compared to healthy controls and ON-MED. In the Active condition, differences in torque resistance were magnified (p=0.002). Medication substantially reduced differences in torque resistance between controls and PD patients in the Passive and Active conditions. CONCLUSIONS: A contralateral activation maneuver substantially increases rigidity in patients with PD, specifically the OFF-MED state. Rigidity is reduced with the application of dopaminergic medication, even with the presence of a contralateral activation maneuver. SIGNIFICANCE: These data support the use of a contralateral activation maneuver as a tool in the diagnosis of PD.
OBJECTIVE: Quantify the enhancement of parkinsonian rigidity associated with a contralateral activation maneuver. METHODS: Twelve subjects with PD and eight controls participated in the study protocol. Subjects' tested hand was displaced by a servo-motor throughout wrist flexion and extension motions of 60° without and with a concurrent gripping activation in the contralateral hand, referred to as Passive and Active conditions, respectively. Subjects with PD were tested in both OFF-MED and ON-MED states. Rigidity was quantified by integrating torque with position during both flexion and extension (torque resistance). ANOVA was performed to assess the effect of contralateral activation on rigidity. RESULTS:PDpatients had significantly (0.038) enhanced torque resistance in OFF-MED compared to healthy controls and ON-MED. In the Active condition, differences in torque resistance were magnified (p=0.002). Medication substantially reduced differences in torque resistance between controls and PDpatients in the Passive and Active conditions. CONCLUSIONS: A contralateral activation maneuver substantially increases rigidity in patients with PD, specifically the OFF-MED state. Rigidity is reduced with the application of dopaminergic medication, even with the presence of a contralateral activation maneuver. SIGNIFICANCE: These data support the use of a contralateral activation maneuver as a tool in the diagnosis of PD.
Authors: Christopher G Goetz; Barbara C Tilley; Stephanie R Shaftman; Glenn T Stebbins; Stanley Fahn; Pablo Martinez-Martin; Werner Poewe; Cristina Sampaio; Matthew B Stern; Richard Dodel; Bruno Dubois; Robert Holloway; Joseph Jankovic; Jaime Kulisevsky; Anthony E Lang; Andrew Lees; Sue Leurgans; Peter A LeWitt; David Nyenhuis; C Warren Olanow; Olivier Rascol; Anette Schrag; Jeanne A Teresi; Jacobus J van Hilten; Nancy LaPelle Journal: Mov Disord Date: 2008-11-15 Impact factor: 10.338
Authors: Maria E Linn-Evans; Matthew N Petrucci; Sommer L Amundsen Huffmaster; Jae Woo Chung; Paul J Tuite; Michael J Howell; Aleksandar Videnovic; Colum D MacKinnon Journal: Clin Neurophysiol Date: 2020-05-12 Impact factor: 3.708
Authors: Sara J Hanrahan; Joshua J Nedrud; Bradley S Davidson; Sierra Farris; Monique Giroux; Aaron Haug; Mohammad H Mahoor; Anne K Silverman; Jun Jason Zhang; Adam Olding Hebb Journal: Brain Sci Date: 2016-11-29