title: Change in Sedentary Time, Physical Activity, Bodyweight, and HbA1c in High-Risk Adults.
abstract: In recent years, there has been a migration toward the use of glycated hemoglobin (HbA1c) in determining glycemic control. This study aimed to quantify the associations between changes in body weight, sedentary time, and moderate to vigorous physical activity (MVPA) time with HbA1c levels for a 3-yr period among adults at high risk of type 2 diabetes.
  
  
  
  This study reports baseline and 3-yr follow-up data from the Walking Away from Type 2 Diabetes study. ActiGraph GT3X accelerometers captured sedentary time and MVPA. Linear regression examined the independent associations of changes in sedentary time, MVPA, and body weight with HbA1c between baseline and 3-yr follow-up.
  
  
  
  The sample composed of 489 participants (mean age = 64.2 ± 7.3 yr, body mass index = 31.7 ± 5.1, 63.4% male) with valid baseline and follow-up accelerometer, body weight, and HbA1c data. After adjustment for known confounders, an increase in MVPA time (per 30 min·d) was associated with a decrease in HbA1c percentage (β = -0.11 [-0.18 to -0.05], P = 0.001), and an increase in body weight (per 6 kg) was associated with an increase in HbA1c percentage (β = 0.08 [0.04-0.12], P < 0.001). The presence of dysglycemia at baseline (HbA1c ≥ 6.0%) strengthened these associations (P < 0.001 for interactions). Change in sedentary time was not significantly associated with change in HbA1c after adjustment for change in MVPA time.
  
  
  
  Increases in MVPA and body weight were associated with a reduction and increase in HbA1c, respectively, particularly in those with dysglycemia. Quantifying the effect that health behavior changes have on HbA1c can be used to inform prevention programs.
authors.affiliation: 1Department of Health Sciences, University of Leicester, Leicester, Leicestershire, UNITED KINGDOM; 2Leicester-Loughborough Diet, Lifestyle and Physical Activity Biomedical Research Unit, National Institute for Health Research (NIHR), Loughborough, UNITED KINGDOM; 3Diabetes Research Centre, University of Leicester, Leicester Diabetes Centre, Leicester General Hospital, Leicester, UNITED KINGDOM; and 4NIHR Collaborations for Leadership in Applied Health Research and Care (CLAHRC), Leicester, UNITED KINGDOM.
authors.forename: Matthew
authors.initials: M
authors.lastname: McCarthy
authors.forename: Charlotte L
authors.initials: CL
authors.lastname: Edwardson
authors.forename: Melanie J
authors.initials: MJ
authors.lastname: Davies
authors.forename: Joseph
authors.initials: J
authors.lastname: Henson
authors.forename: Laura
authors.initials: L
authors.lastname: Gray
authors.forename: Kamlesh
authors.initials: K
authors.lastname: Khunti
authors.forename: Thomas
authors.initials: T
authors.lastname: Yates
mesh_terms: D061725:Accelerometry; D015992:Body Mass Index; D001835:Body Weight / Q000502:physiology*; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000517:prevention & control; D015444:Exercise / Q000502:physiology*; D005260:Female; D006442:Glycated Hemoglobin / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012307:Risk Factors; D057185:Sedentary Behavior; D015431:Weight Loss
chemical_list: D006442:Glycated Hemoglobin