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- Evans, Brittany, 1982-, et al.
(författare)
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Blunted Heart Rate Response as a Potential Endophenotype of Substance Use Disorders : Evidence from High-Risk Youth
- 2015
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Ingår i: Frontiers in Pediatrics. - : Frontiers Media S.A.. - 2296-2360. ; 3
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Children of parents with a substance use disorder (CPSUD) are at increased risk for developing problematic substance use later in life. Endophenotypes may help to clarify the mechanism behind this increased risk. However, substance use and externalizing symptoms may confound the relation between dysregulated physiological stress responding and familial risk for substance use disorders (SUDs).METHODS: We examined whether heart rate (HR) responses differed between CPSUDs and controls. Participants (aged 11-20 years) were CPSUDs (N = 75) and controls (N = 363), semi-matched on the basis of sex, socioeconomic status, and ethnicity. HR was measured continuously during a psychosocial stress procedure. Substance use and externalizing symptoms were self-reported and mother-reported, respectively.RESULTS: A piecewise, mixed-effects model was fit for HR across the stress procedure, with fixed effects for HR reactivity and HR recovery. CPSUDs showed a blunted HR recovery. CPSUDs reported drinking more frequently, were more likely to use tobacco daily, were more likely to report ever use of cannabis and used cannabis more frequently, and exhibited more externalizing symptoms. These variables did not confound the relation between familial risk for SUDs and a blunted HR recovery.CONCLUSION: Our findings suggest dysregulated autonomic nervous system (ANS) responding in CPSUDs and contribute to the accumulating evidence for ANS dysregulation as a potential endophenotype for SUDs.
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- Evans, Brittany E, 1982-, et al.
(författare)
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Stress Reactivity as a Prospective Predictor of Risky Substance Use During Adolescence
- 2016
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Ingår i: Journal of Studies on Alcohol and Drugs. - : Alcohol Research Documentation. - 1937-1888 .- 1938-4114. ; 77:2, s. 208-219
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: Youth who report risky substance use and who have a familial history of substance use disorders (SUDs) are at increased risk for developing SUDs themselves later in life. Physiological stress reactivity may be a potential biological mechanism underlying this increased risk. In the current study, we examined (a) whether physiological stress reactivity to a psychosocial stressor was prospectively related to risky substance use later in adolescence and (b) whether this relation was moderated by a familial history of SUDs.METHOD: Youth from the general population (n = 220) and the children of a parent/parents with an SUD (CPSUDs; n = 60) participated in a psychosocial stress procedure at Time 1. Cortisol and heart rate reactivity were measured during the procedure. Four years later, on average, risky substance use was self-reported (Time 2).RESULTS: Logistic regression analyses showed that youth who had lower cortisol reactivity at Time 1 were more likely to report risky substance use at Time 2. Heart rate reactivity was not related to risky substance use at Time 2, and the relation between stress reactivity and risky substance use was not more pronounced in CPSUDs compared with youth from the general population. These analyses were controlled for alcohol use at Time 1.CONCLUSIONS: The present findings suggest hyporeactivity of the hypothalamic-pituitary-adrenal axis in youth who are more likely to engage in risky substance use later in adolescence. These individuals may be inherently hypoaroused, which leads them to seek out substances in order to achieve a more normalized level of arousal.
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