title: Core muscle activity during suspension exercises.
abstract: OBJECTIVE
  Suspension exercise has been advocated as an effective means to improve core stability among healthy individuals and those with musculoskeletal complaints. However, the activity of core muscles during suspension exercises has not been reported. In this study, we investigated the level of activation of core muscles during suspension exercises within young and healthy adults.
  
  
  METHODS
  The study was conducted in a controlled laboratory setting.
  
  
  METHODS
  Surface electromyographic (sEMG) activity of core muscles (rectus abdominis, external oblique, internal oblique/transversus abdominis, and superficial lumbar multifidus) during four suspension workouts (hip abduction in plank, hamstring curl, chest press, and 45° row) was investigated. Muscle activity during a 5-s hold period of the workouts was measured by sEMG and normalized to the individual's maximal voluntary isometric contraction (MVIC).
  
  
  RESULTS
  Different levels of muscle activation were observed during the hip abduction in plank, hamstring curl, and chest press. Hip abduction in plank generated the highest activation of most abdominal muscles. The 45° row exercise generated the lowest muscle activation.
  
  
  CONCLUSIONS
  Among the four workouts investigated, the hip abduction in plank with suspension was found to have the strongest potential strengthening effect on core muscles. Also, suspension training was found to generate relatively high levels of core muscle activation when compared with that among previous studies of core exercises on stable and unstable support surfaces.
authors.affiliation: Centre for Sports Training and Rehabilitation, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong. Electronic address: nicola.mok@polyu.edu.hk.
authors.forename: Nicola W
authors.initials: NW
authors.lastname: Mok
authors.affiliation: Centre for Sports Training and Rehabilitation, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong.
authors.forename: Ella W
authors.initials: EW
authors.lastname: Yeung
authors.affiliation: Centre for Sports Training and Rehabilitation, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong.
authors.forename: Jeran C
authors.initials: JC
authors.lastname: Cho
authors.affiliation: Centre for Sports Training and Rehabilitation, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong.
authors.forename: Samson C
authors.initials: SC
authors.lastname: Hui
authors.affiliation: Centre for Sports Training and Rehabilitation, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong.
authors.forename: Kimee C
authors.initials: KC
authors.lastname: Liu
authors.affiliation: Centre for Sports Training and Rehabilitation, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong.
authors.forename: Coleman H
authors.initials: CH
authors.lastname: Pang
mesh_terms: D004576:Electromyography; D015444:Exercise / Q000502:physiology*; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D055815:Young Adult
keywords: Core muscles; EMG; Strengthening; Suspension training