title: Effect of an acute bout of aerobic exercise on chemerin levels in obese adults.
abstract: OBJECTIVE
  Serum chemerin concentrations are elevated in obese individuals and may play a role in type 2 diabetes. Exercise improves insulin sensitivity, which may be related to changes in chemerin. This study explored how an acute bout of aerobic exercise affected chemerin levels in non-diabetic obese adults.
  
  
  METHODS
  Blood samples from 11 obese adults were obtained during two separate conditions: sedentary (SED) and exercise (EX; 60-65% VO2peak). Samples were drawn at baseline, immediately following exercise and hourly for an additional 2h. ANOVA was used to test for differences in chemerin between conditions.
  
  
  RESULTS
  Unadjusted analysis showed no difference in overall change (baseline to 2h post) in chemerin between conditions. During the 2-h post-exercise period, chemerin decreased to 12% below baseline, compared to a 2.5% increase above baseline during that time period on the sedentary day (p=0.06, difference in post-to-2h change between conditions). Controlling for homeostatic model assessment of insulin resistance (HOMA-IR), a significant difference existed between EX and SED in the change in chemerin from baseline to 2-h post (p=0.02). Stratified analyses showed a consistent exercise-induced decrease in chemerin among non-insulin resistant subjects, while chemerin increased during exercise among insulin resistant subjects, and then decreased post-exercise.
  
  
  CONCLUSIONS
  An acute bout of exercise in obese individuals may elicit a drop in chemerin levels during the post-exercise period, and this response may vary based on insulin resistance.
authors.affiliation: Department of Exercise Science, Syracuse University, Syracuse, NY 13244, United States. Electronic address: jwlloyd@syr.edu.
authors.forename: Jesse W
authors.initials: JW
authors.lastname: Lloyd
authors.affiliation: Department of Public Health Sciences, University of Rochester School of Medicine & Dentistry, Rochester, NY 14642, United States. Electronic address: kristin_evans@urmc.rochester.edu.
authors.forename: Kristin A
authors.initials: KA
authors.lastname: Evans
authors.affiliation: Department of Exercise Science, Syracuse University, Syracuse, NY 13244, United States. Electronic address: kmzerfas@syr.edu.
authors.forename: Kristy M
authors.initials: KM
authors.lastname: Zerfass
authors.affiliation: Department of Exercise and Rehabilitative Sciences, Slippery Rock University, Slippery Rock, PA 16057, United States. Electronic address: michael.holmstrup@sru.edu.
authors.forename: Michael E
authors.initials: ME
authors.lastname: Holmstrup
authors.affiliation: Department of Nutrition & Exercise Physiology, University of Missouri, Columbia, MO 65211, United States. Electronic address: kanaleyj@missouri.edu.
authors.forename: Jill A
authors.initials: JA
authors.lastname: Kanaley
authors.affiliation: School of Kinesiology and Nutritional Science, California State University, Los Angeles, CA 90032, United States. Electronic address: skeslac@calstatela.edu.
authors.forename: Stefan
authors.initials: S
authors.lastname: Keslacy
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D018925:Chemokines / Q000097:blood*; D003924:Diabetes Mellitus, Type 2 / Q000378:metabolism; D015444:Exercise; D005260:Female; D006801:Humans; D007333:Insulin Resistance; D036341:Intercellular Signaling Peptides and Proteins / Q000097:blood*; D008297:Male; D009765:Obesity / Q000378:metabolism*
chemical_list: D018925:Chemokines; D036341:Intercellular Signaling Peptides and Proteins; C478630:RARRES2 protein, human
keywords: Chemerin; Exercise; Insulin resistance