title: Effect of teammates on changes in physical activity in a statewide campaign.
abstract: OBJECTIVE
  Most Americans do not meet physical activity recommendations. Statewide campaigns can effectively increase activity levels. Reported herein are physical activity outcomes from Shape Up Rhode Island (SURI) 2007, a statewide campaign to increase steps through team-based competition. Given the importance of social networks in behavior change, this paper focused on the effects of team and team characteristics on activity outcomes.
  
  
  METHODS
  For 16weeks, 5333 adults comprising 652 teams wore pedometers and reported their steps online.
  
  
  RESULTS
  Participants' daily steps increased from 7029(3915) at baseline to 9393(5976) at SURI end (p<0.001). There was a significant intraclass correlation for step change among team members (ICC=0.09); thus, an individual's change in steps was influenced by what team they were on. Moreover, baseline team characteristics predicted individual step change; being on a more active team was associated with greater increases in activity for individual members (p<0.001), whereas being on a team with a broad range of steps was associated with smaller changes in activity for individual members (p=0.02).
  
  
  CONCLUSIONS
  These findings are the first to suggest that team members influence individual activity outcomes in team-based statewide campaigns. Future research should explore ways to use social network factors to enhance team-based physical activity programs.
authors.affiliation: Department of Psychiatry and Human Behavior, Warren Alpert Medical School of Brown University, The Miriam Hospital/Weight Control and Diabetes Research Center, Providence, RI, USA. tleahey@lifespan.org
authors.forename: Tricia M
authors.initials: TM
authors.lastname: Leahey
authors.forename: Melissa M
authors.initials: MM
authors.lastname: Crane
authors.forename: Angela Marinilli
authors.initials: AM
authors.lastname: Pinto
authors.forename: Brad
authors.initials: B
authors.lastname: Weinberg
authors.forename: Rajiv
authors.initials: R
authors.lastname: Kumar
authors.forename: Rena R
authors.initials: RR
authors.lastname: Wing
mesh_terms: D000293:Adolescent; D000328:Adult; D005081:Exercise Therapy; D005260:Female; D015438:Health Behavior; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D018670:Monitoring, Ambulatory; D012237:Rhode Island; D012944:Social Support; D016138:Walking; D055815:Young Adult
references.citation: Health Psychol. 1999 Mar;18(2):151-158
references.pmid: 10194050
references.citation: N Engl J Med. 2008 May 22;358(21):2249-58
references.pmid: 18499567
references.citation: Med Sci Sports Exerc. 2008 Jul;40(7 Suppl):S537-43
references.pmid: 18562971
references.citation: Am J Prev Med. 2009 Feb;36(2):133-41
references.pmid: 19135905
references.citation: Percept Mot Skills. 2007 Dec;105(3 Pt 1):968-76
references.pmid: 18229551
references.citation: JAMA. 1989 Nov 3;262(17):2395-401
references.pmid: 2795824
references.citation: Prev Med. 2003 Oct;37(4):356-62
references.pmid: 14507493
references.citation: BMC Womens Health. 2002;2(1):3
references.pmid: 11846892
references.citation: N Engl J Med. 2007 Jul 26;357(4):370-9
references.pmid: 17652652
references.citation: Med Sci Sports Exerc. 2001 Nov;33(11):1825-31
references.pmid: 11689731
references.citation: JAMA. 1995 Feb 1;273(5):402-7
references.pmid: 7823386
references.citation: Obesity (Silver Spring). 2009 May;17(5):991-5
references.pmid: 19180068
references.citation: Med Sci Sports Exerc. 2003 May;35(5):867-71
references.pmid: 12750599
references.citation: JAMA. 2007 Nov 21;298(19):2296-304
references.pmid: 18029834
references.citation: Metabolism. 2006 Oct;55(10):1382-7
references.pmid: 16979410
references.citation: MMWR Morb Mortal Wkly Rep. 2007 Nov 23;56(46):1209-12
references.pmid: 18030281
references.citation: J Am Coll Health. 2007 Jan-Feb;55(4):219-25
references.pmid: 17319328
references.citation: Public Health Nutr. 2009 Jan;12(1):74-81
references.pmid: 18353199
references.citation: Am J Prev Med. 2007 Dec;33(6):455-63
references.pmid: 18022061