title: Anticipatory postural adjustments during sitting reach movement in post-stroke subjects.
abstract: The study assessed the effect of velocity of arm movement on anticipatory postural adjustments (APAs) generation in the contralateral and ipsilateral muscles of individuals with stroke in seating. Ten healthy and eight post-stroke subjects were studied in sitting. The task consisted in reaching an object placed at scapular plane and mid-sternum height at self-selected and fast velocities. Electromyography was recorded from anterior deltoid (AD), upper (UT) and lower trapezius (LT) and latissimus dorsi (LD). While kinematic analysis was used to assess peak velocity and trunk displacement. Differences were found between the timing of APAs on ipsi and contralateral LD and LT in both movement speeds and in ipsilateral UT during movement of the non-affected arm at a self-selected velocity. A delay on the contralateral LD to reach movement with the non-affected arm at fast velocity was also observed. The trunk displacement was greater in post-stroke subjects. Individuals with stroke demonstrated a delay of APAs in the muscles on both sides of the body compared to healthy subjects. The delay was observed during performance of the reaching task with the fast and self-selected velocity.
authors.affiliation: School of Allied Health Sciences of Porto (ESTSP), Polytechnic Institute of Porto, Portugal. Electronic address: soraiarantes@gmail.com.
authors.forename: Soraia
authors.initials: S
authors.lastname: Pereira
authors.affiliation: The Scientific-Technical Area of Physical Therapy (ATCFT) of the School of Allied Health Sciences of Porto (ESTSP), Polytechnic Institute of Porto, Portugal.
authors.forename: Cláudia C
authors.initials: CC
authors.lastname: Silva
authors.affiliation: The Scientific-Technical Area of Physical Therapy (ATCFT) of the School of Allied Health Sciences of Porto (ESTSP), Polytechnic Institute of Porto, Portugal.
authors.forename: Sílvia
authors.initials: S
authors.lastname: Ferreira
authors.affiliation: School of Allied Health Sciences of Porto (ESTSP), Polytechnic Institute of Porto, Portugal.
authors.forename: Cláudia
authors.initials: C
authors.lastname: Silva
authors.affiliation: School of Allied Health Sciences of Porto (ESTSP), Polytechnic Institute of Porto, Portugal.
authors.forename: Nuno
authors.initials: N
authors.lastname: Oliveira
authors.affiliation: School of Allied Health Sciences of Porto (ESTSP), Polytechnic Institute of Porto, Portugal.
authors.forename: Rubim
authors.initials: R
authors.lastname: Santos
authors.affiliation: CIFI[2]D, Biomechanics Labs, Faculty of Sport, Universityof Porto, Porto, Portugal.
authors.forename: John P
authors.initials: JP
authors.lastname: Vilas-Boas
authors.affiliation: INESC-TEC and Faculty of Engineering, University of Porto, Porto, Portugal.
authors.forename: Miguel V
authors.initials: MV
authors.lastname: Correia
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D059031:Anticipation, Psychological / Q000502:physiology*; D001132:Arm / Q000502:physiology; D001696:Biomechanical Phenomena; D003430:Cross-Sectional Studies; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000503:physiopathology*; D011187:Posture / Q000502:physiology*; D012782:Shoulder / Q000503:physiopathology; D020521:Stroke / Q000503:physiopathology*; D060726:Torso / Q000503:physiopathology
keywords: Anticipatory postural adjustments; Electromyography; Movement velocity reach movement; Sitting; Stroke