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Nat Commun. 2017 Apr 18;8:14753. doi: 10.1038/ncomms14753.

Exercise contagion in a global social network.

Author information

1
MIT Sloan School of Management, 100 Main Street, E62-364, Cambridge, Massachusetts 02142, USA.

Abstract

We leveraged exogenous variation in weather patterns across geographies to identify social contagion in exercise behaviours across a global social network. We estimated these contagion effects by combining daily global weather data, which creates exogenous variation in running among friends, with data on the network ties and daily exercise patterns of ∼1.1M individuals who ran over 350M km in a global social network over 5 years. Here we show that exercise is socially contagious and that its contagiousness varies with the relative activity of and gender relationships between friends. Less active runners influence more active runners, but not the reverse. Both men and women influence men, while only women influence other women. While the Embeddedness and Structural Diversity theories of social contagion explain the influence effects we observe, the Complex Contagion theory does not. These results suggest interventions that account for social contagion will spread behaviour change more effectively.

PMID:
28418379
PMCID:
PMC5399289
DOI:
10.1038/ncomms14753
[Indexed for MEDLINE]
Free PMC Article

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