title: Trunk kinematics related to generation and transfer of the trunk flexor momentum are associated with sit-to-stand performance in chronic stroke survivors.
abstract: BACKGROUND
  Stroke subjects show poorer sit-to-stand (STS) performance when compared to matched-healthy subjects, but it is still unclear the trunk role in this poorer performance.
  
  
  OBJECTIVE
  To compare the trunk kinematics related to the generation/transfer of the flexor momentum during the STS task between stroke and matched-healthy subjects, and to investigate if there were relationships between these variables and STS performance.
  
  
  METHODS
  Eighteen chronic stroke survivors and 18 matched-healthy subjects were assessed. The score of the five-repetition STS test and the total/phases duration of the STS (motion analysis system) at both self-selected/fast speeds characterized STS performance. Trunk kinematic variables were maximum forward flexion, peak flexor momentum, and its temporal framework in the STS. Between groups comparisons (Independent Student's t-tests) and correlations (Pearson correlation) were performed (α= 0.05).
  
  
  RESULTS
  Stroke subjects showed poorer STS performance, greater values of maximum forward flexion at fast speeds, and a lower peak flexor momentum at both speeds (0.001≤p≤0.022). In general, the correlations were significant, moderate (0.001≤p≤0.028), and positive to maximum forward flexion (0.37≤r≤0.54) and negative to peak flexor momentum (-0.58≤r≤-0.71).
  
  
  CONCLUSIONS
  The poorer STS performance in stroke survivors is associated to the kinematic changes of the trunk related to the poorer ability to generate/transfer the trunk flexor momentum.
authors: Paula Fernanda de Sousa
authors: PF
authors: Silva
authors: Ludimylla Ferreira
authors: LF
authors: Quintino
authors: Juliane
authors: J
authors: Franco
authors: Fátima
authors: F
authors: Rodrigues-de-Paula
authors: Priscila
authors: P
authors: Albuquerque de Araújo
authors: Christina Danielli Coelho de Morais
authors: CD
authors: Faria
mesh_terms: D000368:Aged; D001696:Biomechanical Phenomena; D002908:Chronic Disease; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D020521:Stroke / Q000503:physiopathology*; D017741:Survivors; D060726:Torso / Q000503:physiopathology*
keywords: Stroke; activities of daily living; mobility; reabilitation; trunk