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Objective: This study aimed to determine whether invisible social control provided by a romantic partner is associated with improved objective glucose outcomes for patients with Type 2 diabetes. Social control reflects a partner's attempt to modify or influence a patient's health behaviors. We hypothesized that the best outcome for all continuous glucose monitoring measures would be captured by an interaction condition reflecting invisible social control., Method: Patients with Type 2 diabetes and their partners ( N = 63 couples) completed an 8-day daily diary period between 2016 and 2017. Self-report measures of social control receipt and provision were obtained each evening from patients and partners and patients wore a continuous glucose monitor throughout the diary period. Outcomes of daily glucose mean, standard deviation, time in range, and coefficient of variation were computed and two-way interactions between social control receipt and social control provision were probed and plotted., Results: The two-way interaction significantly predicted daily glucose mean, standard deviation, and time in range, such that when patients reported no social control receipt, but partners reported social control provision, patients showed improvements in objective glucose measures. We found no significant effect for coefficient of variation., Conclusions: This study was the first to use an invisible social control framework to examine the daily dyadic associations between partner social control provision, patient social control receipt, and four objectively measured continuous glucose monitoring outcomes. Findings suggest that the visibility of social control provided by a romantic partner may be predictive of glycemic control in patients with Type 2 diabetes. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Purpose: Partners of breast cancer (BC) survivors report high rates of psychological distress including fear of cancer recurrence (FCR). Research suggests that partners may have poorer physical health outcomes than the general population, but little research has examined the physiological biomarkers by which distress may impact partner health outcomes. The current study examined the associations between FCR and changes in hair cortisol among BC partners., Methods: Male partners (N = 73) of early-stage BC survivors provided hair samples during two visits, one after completion of survivors' adjuvant treatment (T1) and again 6 months later (T2). Two subscales from the Fear of Cancer Recurrence Inventory and one subscale from the Concerns about Recurrence Scale comprised a latent FCR factor at T1. A latent change score model was used to examine change in cortisol as a function of FCR., Results: Partners were on average 59.65 years of age (SD = 10.53) and non-Hispanic White (83%). Latent FCR at T1 was positively associated (b = 0.08, SE = 0.03, p = .004, standardized β = .45) with change in latent hair cortisol from T1 to T2., Conclusions: Results indicated that greater FCR was associated with increases in hair cortisol in the months following adjuvant treatment. This is one of the first studies to examine the physiological correlates of FCR that may impact health outcomes in BC partners., Implications for Cancer Survivors: Findings highlight the need for further research into the relationship between FCR and its physiological consequences. Interventions to address partner FCR are needed and may aid in improving downstream physical health outcomes., (© 2024. The Author(s).)