title: Baseline predictors of maintenance of intervention-induced changes in physical activity and sitting time among diabetic and pre-diabetic patients: a descriptive case series.
abstract: BACKGROUND
  The aim of this study was to explore the predictive value of baseline characteristics in relation to changes in physical activity (PA) and sedentary behaviour among diabetic and pre-diabetic patients participating in a primary care based exercise intervention. We used a descriptive case series among diabetic and pre-diabetic patients (n = 119, 50.8% male, mean age 65.5 (SD = 7.8)). Measurements took place with questionnaires at baseline and two years after the start of the intervention. Predictor variables included demographic factors, Body Mass Index, baseline PA and sitting time, and baseline socio-cognitive profile.
  
  
  RESULTS
  At follow-up, respondents spent more time being physically active than at baseline. For the total group, the average sitting time remained almost unchanged between the two measurements. Further exploration showed that respondents who had relatively high levels of PA at the start of the intervention, increased their total sitting time, while respondents with relatively low levels of PA at the start decreased their sitting time. The socio-cognitive profile did not predict behaviour change. The intervention appeared to be suitable for people with a low-education level, but the results should be interpreted in view of the limitations of the study such as the non-controlled design, self-reported outcomes and selective drop-out of participants.
  
  
  CONCLUSIONS
  Interventions for this specific target group may need to put more emphasis on the prevention of increased sitting time. The finding that the socio-cognitive profile did not predict behaviour change may underline the proposition that decisions to initiate and maintain PA behaviour change are to a large extend non-linear events. Acknowledging the possible non-linearity of the relationship between socio-cognitive determinants and behaviour change will help our understanding of this complex and dynamic process.
authors: Department of Health Promotion, Maastricht University, School for Nutrition, Toxicology and Metabolism (NUTRIM), Maastricht, MD 6200, the Netherlands. judith.helmink@maastrichtuniversity.nl
authors: Judith H M
authors: JH
authors: Helmink
authors: Jessica S
authors: JS
authors: Gubbels
authors: Femke N
authors: FN
authors: van Brussel-Visser
authors: Nanne K
authors: NK
authors: de Vries
authors: Stef P J
authors: SP
authors: Kremers
mesh_terms: D000368:Aged; D003920:Diabetes Mellitus / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D011236:Prediabetic State / Q000503:physiopathology*; D011795:Surveys and Questionnaires
references: Exerc Sport Sci Rev. 2010 Jul;38(3):105-13
references: 20577058
references: Diabetes Care. 2004 May;27(5):1047-53
references: 15111519
references: Obes Res. 2003 Dec;11(12):1588-96
references: 14694225
references: Psychol Rev. 1977 Mar;84(2):191-215
references: 847061
references: J Am Diet Assoc. 2006 May;106(5):698-705
references: 16647327
references: Int J Environ Res Public Health. 2011 Sep;8(9):3747-58
references: 22016713
references: Int J Behav Nutr Phys Act. 2006 Sep 19;3:29
references: 16982008
references: Diabetes Care. 2005 Jul;28(7):1599-603
references: 15983307
references: Int J Behav Nutr Phys Act. 2012 Jun 22;9:78
references: 22726453
references: Gait Posture. 2010 Jan;31(1):82-6
references: 19854651
references: Psychol Health Med. 2003 Feb 1;8(1):57-69
references: 21888489
references: Diabetes Educ. 2004 Sep-Oct;30(5):805-19
references: 15510532
references: Br J Gen Pract. 2011 Mar;61(584):e125-33
references: 21375895
references: Health Psychol. 2003 Mar;22(2):178-88
references: 12683738
references: Int J Behav Nutr Phys Act. 2006 Sep 12;3:25
references: 16968551
references: Int J Obes Relat Metab Disord. 2003 Mar;27(3):377-84
references: 12629566
references: Eur Heart J. 2011 Mar;32(5):590-7
references: 21224291
references: Psychol Health. 2010 Jan;25(1):7-23
references: 20391204
references: Med Sci Sports Exerc. 2003 Aug;35(8):1381-95
references: 12900694
references: BMC Public Health. 2007 Sep 19;7:249
references: 17877832
references: Am J Prev Med. 2007 Feb;32(2):163-72
references: 17197152
references: Int J Behav Nutr Phys Act. 2010 May 26;7:49
references: 20504352
references: Br J Gen Pract. 2007 Dec;57(545):979-86
references: 18252074
references: N Engl J Med. 2001 May 3;344(18):1343-50
references: 11333990
references: Prev Med. 2011 Oct;53(4-5):299-302
references: 21807021
references: Eur J Public Health. 2011 Feb;21(1):56-62
references: 20371500
references: N Engl J Med. 2002 Feb 7;346(6):393-403
references: 11832527
references: BMJ. 2006 Feb 25;332(7539):458-60
references: 16443610
references: J Gerontol A Biol Sci Med Sci. 2001 Oct;56 Spec No 2:36-46
references: 11730236
references: Age Ageing. 2012 Jan;41(1):111-4
references: 21749993