title: Dyadic Effects of Individual and Friend on Physical Activity in College Students.
abstract: OBJECTIVE
  Physical activity (PA) tends to decline throughout the college years, and close friends' influence is known to be an important factor in maintaining PA. This study examined the actor effect and partner effect between an individual and his/her friend regarding the influence of self-efficacy and social support on PA among Korean college students.
  
  
  METHODS
  Cross-sectional survey data from 108 pairs of individual students and friends were analyzed.
  
  
  METHODS
  The survey questionnaire measured PA, self-efficacy toward exercise, social support for PA, anxiety and depression, community environments, and perceived health status. Structural equation modeling with path analysis was conducted to test Actor-Partner Interdependence Model (APIM) explaining close relationships on PA.
  
  
  RESULTS
  One-sided partner effect that friends' perceived friend support was directly related to individual's PA (β = 0.20, p < .05) was revealed. Regarding actor effects, self-efficacy was directly related to higher levels of PA for individual and friend. Perceived health status was related to higher level of individuals' PA.
  
  
  CONCLUSIONS
  These results suggest a role for public health nurses in developing interventions for college-aged young adults that promotes friend support for PA as well as individual self-efficacy toward PA, to engage young adults in establishing lifelong health-promoting PA.
authors.affiliation: College of Nursing, Nursing Policy Research Institute, Yonsei University, Seoul, Korea.
authors.forename: Gwang Suk
authors.initials: GS
authors.lastname: Kim
authors.affiliation: College of Nursing, Nursing Policy Research Institute, Yonsei University, Seoul, Korea.
authors.forename: Chung Yul
authors.initials: CY
authors.lastname: Lee
authors.affiliation: College of Nursing, Nursing Policy Research Institute, Yonsei University, Seoul, Korea.
authors.forename: In Sook
authors.initials: IS
authors.lastname: Kim
authors.affiliation: College of Nursing, Nursing Policy Research Institute, Yonsei University, Seoul, Korea.
authors.forename: Tae Hwa
authors.initials: TH
authors.lastname: Lee
authors.affiliation: College of Nursing, Nursing Policy Research Institute, Yonsei University, Seoul, Korea.
authors.forename: Eunhee
authors.initials: E
authors.lastname: Cho
authors.affiliation: College of Nursing, Nursing Policy Research Institute, Yonsei University, Seoul, Korea.
authors.forename: Hyeonkyeong
authors.initials: H
authors.lastname: Lee
authors.affiliation: College of Nursing, Health Systems Science, University of Illinois at Chicago, Chicago, Illinois.
authors.forename: Linda L
authors.initials: LL
authors.lastname: McCreary
authors.affiliation: Department of Nursing, Graduate School of Yonsei University, Seoul, Korea.
authors.forename: Su Hee
authors.initials: SH
authors.lastname: Kim
mesh_terms: D000293:Adolescent; D000328:Adult; D003430:Cross-Sectional Studies; D015444:Exercise / Q000523:psychology*; D005260:Female; D033062:Friends / Q000523:psychology*; D006801:Humans; D007398:Interpersonal Relations; D007723:Korea; D008297:Male; D020377:Self Efficacy; D012944:Social Support; D013334:Students / Q000523:psychology* / Q000706:statistics & numerical data; D011795:Surveys and Questionnaires; D014495:Universities; D055815:Young Adult
keywords: Korean; college student; health status; physical activity; self-efficacy; social support