Contributions
Abstract: EP1577
Type: ePoster
Abstract Category: RIMS - Multi-disciplinary rehabilitation
This study aimed at evaluating the muscle activation patterns and kinematic parameters of the upper limbs in people with Multiple Sclerosis (MS) while controlling motion and/or force in (i) free space and in presence of (ii) an assistive force, (iii) an elastic force field that opposes the movement and (iv) a rigid constraint. We enrolled eleven subjects (2 M - 9 F; 49±9 years) with clinically definite MS according to McDonald criteria and eleven healthy controls (2 M - 9 F; 50±9 years). The inclusion criteria for MS subjects were: stable phase of the disease, EDSS ≤ 7, FSS ≥ 20, Modified Ashworth scale < 2 and 9-HPT>20.
Subjects were seated on a chair grasping the handle of a planar manipulandum that allow measuring the hand position and simulating the different environments. They performed the experiment with each hand. The task consisted of reaching targets presented in random order in 8 directions at a fixed distance from a central target (14 cm or 10 N). We recorded the activities of 15 muscles in the active arm: triceps brachii, triceps brachii lateral, biceps brachii short head, biceps brachii long head, brachialis, brachioradialis, pronator teres, infraspinatus, latissimus dorsi, upper trapezius, rhomboid major, pectoralis major, anterior deltoid, medial deltoid and posterior deltoid. MS subjects moved more slowly with a longer deceleration phase, had a higher aiming error, and generated less straight trajectories compared to the control subjects.
According to several studies, muscles participate to movement generation in well-defined functional groups, called "synergies“. The results showed that as the environment changed from free space to rigid constraints the subjects with MS modulated their synergies in ways that differed significantly from the modulations observed in unimpaired controls. For both groups the most difficult task was the control of the cursor in the isometric force condition.
Disclosure: Margit Muller: nothing to disclose
Laura Pellegrino: nothing to disclose
Claudio Solaro: nothing to disclose
Martina Coscia: nothing to disclose
Maura Casadio: nothing to disclose
Abstract: EP1577
Type: ePoster
Abstract Category: RIMS - Multi-disciplinary rehabilitation
This study aimed at evaluating the muscle activation patterns and kinematic parameters of the upper limbs in people with Multiple Sclerosis (MS) while controlling motion and/or force in (i) free space and in presence of (ii) an assistive force, (iii) an elastic force field that opposes the movement and (iv) a rigid constraint. We enrolled eleven subjects (2 M - 9 F; 49±9 years) with clinically definite MS according to McDonald criteria and eleven healthy controls (2 M - 9 F; 50±9 years). The inclusion criteria for MS subjects were: stable phase of the disease, EDSS ≤ 7, FSS ≥ 20, Modified Ashworth scale < 2 and 9-HPT>20.
Subjects were seated on a chair grasping the handle of a planar manipulandum that allow measuring the hand position and simulating the different environments. They performed the experiment with each hand. The task consisted of reaching targets presented in random order in 8 directions at a fixed distance from a central target (14 cm or 10 N). We recorded the activities of 15 muscles in the active arm: triceps brachii, triceps brachii lateral, biceps brachii short head, biceps brachii long head, brachialis, brachioradialis, pronator teres, infraspinatus, latissimus dorsi, upper trapezius, rhomboid major, pectoralis major, anterior deltoid, medial deltoid and posterior deltoid. MS subjects moved more slowly with a longer deceleration phase, had a higher aiming error, and generated less straight trajectories compared to the control subjects.
According to several studies, muscles participate to movement generation in well-defined functional groups, called "synergies“. The results showed that as the environment changed from free space to rigid constraints the subjects with MS modulated their synergies in ways that differed significantly from the modulations observed in unimpaired controls. For both groups the most difficult task was the control of the cursor in the isometric force condition.
Disclosure: Margit Muller: nothing to disclose
Laura Pellegrino: nothing to disclose
Claudio Solaro: nothing to disclose
Martina Coscia: nothing to disclose
Maura Casadio: nothing to disclose