title: Psychosocial mediators of a theory-based resistance training maintenance intervention for prediabetic adults.
abstract: OBJECTIVE
  Examine psychosocial mediators of the effects of high vs. low-dose resistance training (RT) maintenance interventions among older (ages 50-69), overweight and pre-diabetic adults.
  
  
  METHODS
  Participants (N = 123) completed a three-month supervised RT initiation phase and were subsequently randomised (time 1) to high or low-dose six-month unsupervised RT maintenance interventions (time 2), followed by a six-month no-contact phase (time 3).
  
  
  METHODS
  Online measures of putative mediators and RT behaviour.
  
  
  RESULTS
  RT intervention condition (high vs. low dose) had significant effects on change from time 1 to time 2 in behavioural expectation, self-regulation and perceived satisfaction (f(2) = .04-.08), but not outcome expectancies, RT strategies or behavioural intentions (f(2) ≤ .02). Change in each of the putative mediators, except for outcome expectancies (f(2) ≤ .02), had significant effects on RT behaviour at times 2 (f(2) = .12-.27) and 3 (f(2) = .23-.40). In a multiple mediation model, behavioural expectation (f(2) = .11) and self-regulation (f(2) = .06) mediated the effects of RT intervention condition on time 2 RT behaviour, whereas perceived satisfaction did not (f(2) = .01). Self-regulation was a significant mediator of intervention effects on time 3 RT behaviour (f(2) = .11), but behavioural expectation and perceived satisfaction were not (f(2) = .04).
  
  
  CONCLUSIONS
  Findings suggest that behavioural expectation and self-regulation are appropriate targets for RT maintenance interventions among at-risk older adults.
authors.affiliation: a Department of Behavioral and Social Sciences , Brown University School of Public Health , Providence , RI , USA.
authors.forename: David M
authors.initials: DM
authors.lastname: Williams
authors.affiliation: a Department of Behavioral and Social Sciences , Brown University School of Public Health , Providence , RI , USA.|b Centers for Behavioral and Preventive Medicine , The Miriam Hospital , Providence , RI , USA.
authors.forename: Shira
authors.initials: S
authors.lastname: Dunsiger
authors.affiliation: c Department of Human Nutrition, Foods, and Exercise , Virginia Tech , Blacksburg , RI , USA.
authors.forename: Brenda M
authors.initials: BM
authors.lastname: Davy
authors.affiliation: d Department of Psychology , Virginia Tech , Blacksburg , RI , USA.
authors.forename: Sarah A
authors.initials: SA
authors.lastname: Kelleher
authors.affiliation: c Department of Human Nutrition, Foods, and Exercise , Virginia Tech , Blacksburg , RI , USA.
authors.forename: Elaina L
authors.initials: EL
authors.lastname: Marinik
authors.affiliation: d Department of Psychology , Virginia Tech , Blacksburg , RI , USA.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Winett
mesh_terms: D000368:Aged; D005260:Female; D015438:Health Behavior; D006801:Humans; D033182:Intention; D008297:Male; D008875:Middle Aged; D050177:Overweight / Q000523:psychology / Q000628:therapy; D011236:Prediabetic State / Q000523:psychology* / Q000628:therapy*; D011582:Psychological Theory; D055070:Resistance Training / Q000379:methods*; D000068356:Self-Control; D016896:Treatment Outcome
keywords: behavioural expectation; behavioural maintenance; diabetes; older adults; self-regulation; theory