title: Quantification of the safe maximal lift in functional capacity evaluations: comparison of muscle recruitment using SEMG and therapist observation.
abstract: BACKGROUND
  This study aimed to identify any correlation between muscle activity using surface electromyography (SEMG) and therapist determined safe maximal lift (SML) during the bench to shoulder lift of the WorkHab FCE. This would support construct (convergent) validity of SML determination in the WorkHab FCE.
  
  
  METHODS
  An experimental laboratory based study design was used. Twenty healthy volunteers performed the bench to shoulder lift of the WorkHab FCE whilst SEMG of upper trapezius, mid deltoid, thoracic, brachioradialis and bicep muscles were recorded. A summary of the data is presented using descriptive statistics and differences between groups were tested using generalised linear mixed models.
  
  
  RESULTS
  Results showed a significant difference in activity and duration of muscle activation with increasing weight lifted [p = 0.000 and p = 0.024 (brachioradialis)]. There was a significant difference between the up lift (bench to shoulder) and the down lift (shoulder to bench) for all muscles (p = 0.000) except the brachioradialis (p = 0.819). No significant change was found in muscle activity before or after the SML.
  
  
  CONCLUSIONS
  Convergent validity of the bench to shoulder lift of the WorkHab FCE was not established as no relationship between the muscle recruitment using SEMG and SML, as determined by therapist observation was identified during this lift.
authors.affiliation: School of Health Sciences, University of Newcastle, University Drive, Callaghan, NSW, Australia. Carole.James@newcastle.edu.au
authors.forename: Carole
authors.initials: C
authors.lastname: James
authors.forename: Lynette
authors.initials: L
authors.lastname: Mackenzie
authors.forename: Mike
authors.initials: M
authors.lastname: Capra
mesh_terms: D000328:Adult; D001315:Australia; D001696:Biomechanical Phenomena; D004576:Electromyography; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D017770:Lifting; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000293:injuries / Q000502:physiology*; D009140:Musculoskeletal Diseases / Q000517:prevention & control*; D016272:Occupational Health; D005082:Physical Exertion / Q000502:physiology*; D011594:Psychometrics; D015203:Reproducibility of Results; D014938:Work Capacity Evaluation