title: Feeding influences adipose tissue responses to exercise in overweight men.
abstract: Feeding profoundly affects metabolic responses to exercise in various tissues, but the effect of feeding status on human adipose tissue responses to exercise has never been studied. Ten healthy overweight men aged 26 ± 5 yr (mean ± SD) with a waist circumference of 105 ± 10 cm walked at 60% of maximum oxygen uptake under either fasted or fed conditions in a randomized, counterbalanced design. Feeding comprised 648 ± 115 kcal 2 h before exercise. Blood samples were collected at regular intervals to examine changes in metabolic parameters and adipokine concentrations. Adipose tissue samples were obtained at baseline and 1 h after exercise to examine changes in adipose tissue mRNA expression and secretion of selected adipokines ex vivo. Adipose tissue mRNA expression of pyruvate dehydrogenase kinase isozyme 4 (PDK4), adipose triglyceride lipase, hormone-sensitive lipase (HSL), fatty acid translocase/CD36, glucose transporter type 4 (GLUT4), and insulin receptor substrate 2 (IRS2) in response to exercise were lower in fed compared with fasted conditions (allP≤ 0.05). Postexercise adipose IRS2 protein was affected by feeding (P≤ 0.05), but Akt2, AMPK, IRS1, GLUT4, PDK4, and HSL protein levels were not different. Feeding status did not impact serum and ex vivo adipose secretion of IL-6, leptin, or adiponectin in response to exercise. This is the first study to show that feeding before acute exercise affects postexercise adipose tissue gene expression, and we propose that feeding is likely to blunt long-term adipose tissue adaptation to regular exercise.
authors.affiliation: Department for Health, University of Bath, Bath, United Kingdom.
authors.forename: Yung-Chih
authors.initials: YC
authors.lastname: Chen
authors.affiliation: Department for Health, University of Bath, Bath, United Kingdom.
authors.forename: Rebecca L
authors.initials: RL
authors.lastname: Travers
authors.affiliation: Department for Health, University of Bath, Bath, United Kingdom.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Walhin
authors.affiliation: Department for Health, University of Bath, Bath, United Kingdom.
authors.forename: Javier T
authors.initials: JT
authors.lastname: Gonzalez
authors.affiliation: Department for Health, University of Bath, Bath, United Kingdom.
authors.forename: Francoise
authors.identifier: 0000-0002-9029-3390
authors.initials: F
authors.lastname: Koumanov
authors.affiliation: Department for Health, University of Bath, Bath, United Kingdom.
authors.forename: James A
authors.initials: JA
authors.lastname: Betts
authors.affiliation: Department for Health, University of Bath, Bath, United Kingdom d.thompson@bath.ac.uk.
authors.forename: Dylan
authors.initials: D
authors.lastname: Thompson
mesh_terms: D000273:Adipose Tissue / Q000503:physiopathology*; D000293:Adolescent; D000328:Adult; D001835:Body Weight; D004435:Eating; D005081:Exercise Therapy / Q000379:methods*; D005215:Fasting; D006801:Humans; D008297:Male; D050177:Overweight / Q000503:physiopathology* / Q000517:prevention & control*; D016896:Treatment Outcome; D055815:Young Adult
keywords: adipose tissue; exercise; feeding; postprandial