Biomedical subjects

Yves Roy

Publications and source records attributed to Yves Roy.

3 recordsLinked to original sources

PubMed2006

Kinematic analysis of upper limbs and trunk movement during bilateral movement after stroke.

OBJECTIVE: To compare the kinematics of the upper limbs and trunk during unilateral and parallel bilateral tasks in subjects with hemiparesis and control subjects. DESIGN: Comparative study. SETTING: Geriatric center offering rehabilitation services. PARTICIPANTS: Convenience sample of 15 persons (age, 69.4 +/- 12.0 y; > or = 3 mo poststroke) recruited in a geriatric center with rehabilitation services, and 13 control persons (67.8 +/- 7.5 y) participated in the study. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Unilateral and bilateral movements toward 1 or 2 targets located beyond arm's length and positioned in 3 directions. Angular changes of both upper limbs and trunk were characterized in the sagittal, frontal, and horizontal planes. RESULTS: During the bilateral task, the deficits of the kinematic joints of the paretic upper limb persisted in subjects with hemiparesis as compared with the corresponding upper limb in the control subjects (abduction shoulder: subjects with hemiparesis, 5.7 degrees +/- 5.3 degrees; control subjects, 0.7 degrees +/- 4.8 degrees; extension elbow: subjects with hemiparesis, 38.2 degrees +/- 14.2 degrees; control subjects, 52.8 degrees +/- 12.5 degrees) with a marked flexion of the trunk (subjects with hemiparesis, 33.7 degrees +/- 8.7 degrees; control subjects, 26.8 degrees +/- 5.8 degrees). The elbow extension of the nonparetic upper limb was reduced (subjects with hemiparesis, 41.0 degrees +/- 13.6 degrees; control subjects, 52.8 degrees +/- 12.5 degrees). CONCLUSIONS: The use of parallel bilateral reaching tasks and placing movements of the upper extremities in the subjects with hemiparesis contributed an increase in the trunk flexion rather than improve the motor performance of the paretic upper limb, especially with regard to increasing elbow extension.

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PubMed2005

Weight-bearing on the lower limbs in a sitting position during bilateral movement of the upper limbs in post-stroke hemiparetic subjects.

OBJECTIVE: Verify weight-bearing on the feet in a sitting position during pointing in different directions with 1 or both upper limbs. DESIGN: Comparative study. SUBJECTS: Fifteen subjects with post-stroke hemiparesis with good to very good motor recovery and 13 healthy subjects participated in the study. METHODS: The subjects were seated on a chair with each foot resting on a force plate. They had to touch with 1 or, simultaneously with both hands, 2 target(s) located in front of them or at a 45 degrees angle on either side at a standardized distance beyond their upper limb's length. The percentage of weight loading variation under each foot was measured. RESULTS: Weight-bearing on the paretic foot is reduced during unilateral and bilateral pointing in the anterior direction and 45 degrees ipsilateral to the paretic side. However, both unilateral and bilateral pointing 45 degrees contralateral to the paretic side produced symmetrical weight-bearing on both feet, paretic and non-paretic. CONCLUSION: Since the paretic muscles of the trunk are probably used to control the leaning of the trunk towards the non-paretic side, the subjects with hemiparesis may put weight on the paretic foot to compensate for trunk weakness and maintain balance.

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PubMed2004

Dynamic analysis of trunk flexion after stroke.

OBJECTIVE: To quantify trunk movement and lower-extremity weight bearing in patients with stroke-associated hemiparesis compared with healthy subjects. DESIGN: Controlled study with 2 groups: persons with hemiparesis and healthy controls. SETTING: Geriatric center offering rehabilitation services. PARTICIPANTS: A convenience sample of 15 persons with poststroke hemiparesis (age, 69.4+/-12.0y; > or =3mo poststroke; total motor function range, 63-95/100) on the Fugl-Meyer Assessment and of 13 healthy persons (age, 67.8+/-7.5y). INTERVENTIONS: Subjects were seated on a chair placed on a forceplate with their feet on 2 additional forceplates. A target was placed directly in front of or at a 45 degrees angle from the midline at 66% of the nonparetic/dominant arm length. Subjects' task was to touch the target with their forehead. Main outcome measures Amplitude and speed of trunk movements, displacement of the global center of pressure (COP), and percentage of body weight distributed on the buttocks and the feet. RESULTS: Despite speed and amplitude comparable to that of the healthy subjects (NS), subjects with hemiparesis (HS) had less COP displacement (HS, 33.7+/-6.9; NS, 40.5+/-9.2), resulting in a lower weight-bearing value on the feet (HS for the paretic foot, 2.3%+/-3.6%; HS for the nonparetic foot, 2.2%+/-2.9%; NS for the nondominant foot, 5.4%+/-3.4%; NS for the dominant foot, 5.2%+/-4.0%). CONCLUSIONS: The similar amplitude of trunk flexion with a decreased displacement of COP and a lower weight bearing on the feet suggest smaller anterior displacement of the body mass. It is possible that trunk movements in persons with hemiparesis are executed by the upper trunk with very little anterior tilt of the pelvis.

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