title: A comparison of 2 assessment protocols to specifically target abdominal muscle endurance.
abstract: OBJECTIVE
  The purpose of this study was to compare 2 variations of a test designed to evaluate abdominal muscle endurance.
  
  
  METHODS
  This study included 21 healthy adults (10 men and 11 women) aged 23.2 ± 3.3 years. Participants recruited from a chiropractic institution performed 2 fatiguing protocols (with a lordotic posture or free of instructions), each immediately preceded and followed by a maximum voluntary contraction. Force data and surface electromyography of 6 muscles were recorded. The influence of posture on endurance time as well as the effect of posture on MedF/time slopes for each individual muscle throughout the first 4 30-seconds time segments was assessed.
  
  
  RESULTS
  Mean time until exhaustion was 261.3 ± 149.8 seconds for the lordotic condition and 358.8 ± 206.4 seconds for the free condition. The lordotic condition induced significantly more fatigue than the free condition in 3 muscles during the first 30 seconds. However, both conditions induced similar levels of fatigue for the following 30 seconds. After the first 60 seconds, no significant differences in fatigability were noted between the 2 experimental conditions.
  
  
  CONCLUSIONS
  For the subjects studied, lumbar lordosis had a significant influence on trunk muscle fatigue during abdominal muscle endurance assessment. Specifically targeting the abdominal muscles during an endurance task remains a challenge.
authors.affiliation: Département de Chiropratique, Université du Québec à Trois-Rivières, Quebec, Canada.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Pagé
authors.forename: Jean-Daniel
authors.initials: JD
authors.lastname: Dubois
authors.forename: Martin
authors.initials: M
authors.lastname: Descarreaux
mesh_terms: D000009:Abdominal Muscles / Q000502:physiology*; D000328:Adult; D004576:Electromyography; D005260:Female; D006801:Humans; D007537:Isometric Contraction; D008159:Lumbar Vertebrae / Q000502:physiology; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology; D010807:Physical Endurance; D011187:Posture; D055815:Young Adult