title: Trunk Extensor, Flexor and Lateral Flexor Endurance Time in Sedentary Workers Aged 20-49 Years.
abstract: OBJECTIVE
  The purposes of this study were to (1) quantify trunk endurance times according to subjects' age and sex; and (2) identify factors affecting the endurance times.
  
  
  METHODS
  Endurance times ofsedentary workers aged 20-49 years were determined by an extensor endurance, aflexor endurance, and right and left side bridge (trunk lateral flexor) tests. Each test was performed once in random order with a resting period of 10 minutes between tests.
  
  
  RESULTS
  Of 137 workers, Two-way analysis ofvariance indicated that age had no effect on these 4 isometric trunk endurance tests. Sex had an effect on the extensor endurance test, and right and left side bridge tests. Females had longer endurance times than males for the trunk extensor muscle, whereas males had longer endurance times thanfemales for right and left lateral flexor trunk muscles. Low negative but significant Pearson ' correlations (r = -0.233 to -0.377, p = 0.047 to 0.001) were found between extensor endurance times vs. body weight and abdominal skinfold thickness in both sexes. Only in males, both right and left side bridge endurance times correlated with abdominal skinfold thickness (r = -0.296 and r = -0.382, respectively, p<0.05 both).
  
  
  CONCLUSIONS
  Sex, weight and abdominal skinfold thickness factors should be considered when trunk muscle endurance is evaluated.
authors.forename: Wattana
authors.initials: W
authors.lastname: Jalayondeja
authors.forename: Sasiporn
authors.initials: S
authors.lastname: Kraingchieocharn
mesh_terms: D000328:Adult; D001835:Body Weight / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D057185:Sedentary Behavior; D012737:Sex Factors; D055815:Young Adult