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Genetic Influences on Regular Exercise Behavior
Published in James M. Rippe, Lifestyle Medicine, 2019
D. Matthijs, Nienke Schutte, H.M. Marleen
The spouse correlation for exercise behavior was significant in all these studies and ranged from 0.16 to 0.48. De Moor et al.49 analyzed twin-spouse pairs and demonstrated that the significant spouse correlation for exercise was best explained by phenotypic assortment (i.e., that partners choose each other because they are similar in their exercise behavior) rather than by social homogamy (i.e., that partners similar in exercise behavior meet and marry because they come from similar social backgrounds) or social interaction processes (i.e., that partners resemble each other because they spend time together and mutually influence each other). Importantly, an extended twin-family model that took assortative mating into account led to nearly the same heritability estimates as the twin-only model.
Circadian preference and relationship satisfaction among three types of couples
Published in Chronobiology International, 2019
Juan F. Díaz-Morales, Zaida Parra-Robledo, Cristina Escribano
The results of these studies indicate that some couples are desynchronised in M/E (low M/E similarity) and that, in general, people prefer partners with similar M/E. M/E similarity was found to be greater in old (Randler and Kretz 2011) than in young couples (Jocz et al. 2018), what could indicate that there is a convergence effect on M/E. Given the possible effect of temporal convergence on personality characteristics (Botwin et al. 1997; Gruber-Baldini et al. 1995), it is necessary to control for the relationship length. Gaunt (2006) indicates that the degree of similarity may be more or less relevant for RS depending on the stage of the relationship. Additionally, Blackwell and Lichter (2004) detected a slight increase in ethnic and religion similarities across the continuum of commitment in sexually intimate dating, cohabiting, and married couples, even though these traits were associated with substantial homogamy (i.e. similarity at the beginning of the relationship, when the couple is getting to know each other). Since few studies have been conducted with couples who do not live in the same household (Botwin et al. 1997; Figueredo et al. 2006; Zentner 2005), Watson et al. (2004) recommended analysing couples at the beginnings of their relationships, since the key factors for the success of the relationship could be identified at that stage.