Kelly A Bennion1,2, Deborah Tate3,4, Karen Muñoz-Christian2,5, Suzanne Phelan2,6. 1. Department of Psychology and Child Development, California Polytechnic State University, San Luis Obispo, California, USA. 2. Center for Health Research, California Polytechnic State University, San Luis Obispo, California, USA. 3. Department of Health Behavior, University of North Carolina at Chapel Hill Gillings School of Global Public Health, Chapel Hill, North Carolina, USA. 4. Department of Nutrition, University of North Carolina at Chapel Hill Gillings School of Global Public Health, Chapel Hill, North Carolina, USA. 5. Department of World Languages and Cultures, California Polytechnic State University, San Luis Obispo, California, USA. 6. Department of Kinesiology and Public Health, California Polytechnic State University, San Luis Obispo, California, USA.
Abstract
OBJECTIVE: This cluster randomized trial tested whether an effective internet-based weight-loss intervention for low-income, postpartum women resulted in greater improvements in targeted social cognitive theory (SCT) constructs and psychosocial outcomes. METHODS: Fit Moms/Mamás Activas was a 12-month cluster randomized controlled trial of 370 postpartum women at 12 Special Supplemental Nutrition Program for Women, Infants, Children (WIC) clinics that were randomly assigned to intervention or standard WIC. SCT constructs (weight-control behaviors, cognitive restraint, disinhibition, self-efficacy, social support, body image) and psychosocial outcomes (depressive symptoms and stress) were measured at study entry and after 6 and 12 months. RESULTS: The intervention versus standard WIC resulted in greater 12-month increases in weight-control behaviors (3.28 points [95% CI: 1.06-5.50]), self-monitoring of weight and eating (2.28 points [1.17-3.40]), and cognitive restraint (1.93 points [0.78-3.08]) (all P ≤ 0.004). The intervention effect was only modestly (ηp 2 = 0.02) mediated by improvements in these factors. No significant group by time effect was observed for disinhibition, self-efficacy, social support, body image, depressive symptoms, or stress. CONCLUSIONS: Among low-income postpartum women, an effective internet-based weight-loss program resulted in improved weight-control behaviors and cognitive restraint but did not affect other SCT targets and psychosocial outcomes.
RCT Entities:
OBJECTIVE: This cluster randomized trial tested whether an effective internet-based weight-loss intervention for low-income, postpartum women resulted in greater improvements in targeted social cognitive theory (SCT) constructs and psychosocial outcomes. METHODS: Fit Moms/Mamás Activas was a 12-month cluster randomized controlled trial of 370 postpartum women at 12 Special Supplemental Nutrition Program for Women, Infants, Children (WIC) clinics that were randomly assigned to intervention or standard WIC. SCT constructs (weight-control behaviors, cognitive restraint, disinhibition, self-efficacy, social support, body image) and psychosocial outcomes (depressive symptoms and stress) were measured at study entry and after 6 and 12 months. RESULTS: The intervention versus standard WIC resulted in greater 12-month increases in weight-control behaviors (3.28 points [95% CI: 1.06-5.50]), self-monitoring of weight and eating (2.28 points [1.17-3.40]), and cognitive restraint (1.93 points [0.78-3.08]) (all P ≤ 0.004). The intervention effect was only modestly (ηp 2 = 0.02) mediated by improvements in these factors. No significant group by time effect was observed for disinhibition, self-efficacy, social support, body image, depressive symptoms, or stress. CONCLUSIONS: Among low-income postpartum women, an effective internet-based weight-loss program resulted in improved weight-control behaviors and cognitive restraint but did not affect other SCT targets and psychosocial outcomes.
Authors: Katrina M Krause; Cheryl A Lovelady; Bercedis L Peterson; Najmul Chowdhury; Truls Østbye Journal: Public Health Nutr Date: 2010-06-02 Impact factor: 4.022
Authors: William C Knowler; Elizabeth Barrett-Connor; Sarah E Fowler; Richard F Hamman; John M Lachin; Elizabeth A Walker; David M Nathan Journal: N Engl J Med Date: 2002-02-07 Impact factor: 91.245