title: Analysis of the neuromuscular activity during rising from a chair in water and on dry land.
abstract: OBJECTIVE
  The purpose of the present study was to analyze the neuromuscular responses during the performance of a sit to stand [STS] task in water and on dry land.
  
  
  METHODS
  10 healthy subjects, five males and five females were recruited for study. Surface electromyography sEMG was used for lower limb and trunk muscles maximal voluntarty contraction [MVC] and during the STS task.
  
  
  RESULTS
  Muscle activity was significantly higher on dry land than in water normalized signals by MVC from the quadriceps-vastus medialis [17.3%], the quadriceps - rectus femoris [5.3%], the long head of the biceps femoris [5.5%], the tibialis anterior [13.9%], the gastrocnemius medialis [3.4%], the soleus [6.2%]. However, the muscle activity was higher in water for the rectus abdominis [-26.6%] and the erector spinae [-22.6%].
  
  
  CONCLUSIONS
  This study for the first time describes the neuromuscular responses in healthy subjects during the performance of the STS task in water. The differences in lower limb and trunk muscle activity should be considered when using the STS movement in aquatic rehabilitation.
authors.affiliation: Department of Physiotherapy, University of Malaga, Av de Martiricos s/n, 29071, Spain. Electronic address: acuesta@uma.es.
authors.forename: A I
authors.initials: AI
authors.lastname: Cuesta-Vargas
authors.forename: C L
authors.initials: CL
authors.lastname: Cano-Herrera
authors.forename: S
authors.initials: S
authors.lastname: Heywood
mesh_terms: D000328:Adult; D004576:Electromyography; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D006875:Hydrotherapy; D007101:Immersion / Q000503:physiopathology*; D007866:Leg / Q000502:physiology; D008297:Male; D009068:Movement / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D061886:Neuromuscular Monitoring; D011187:Posture / Q000502:physiology; D013647:Task Performance and Analysis; D013848:Thigh / Q000502:physiology; D055815:Young Adult
keywords: Aquatic; Electromyography; Functional task; Hydrotherapy; Sit to stand