Lower heart rate variability may serve as a biomarker for vulnerability to stress-related sleep disturbances and subsequent depressive symptoms.
May flag HRV for research on stress vulnerability; leaves open any clinical role in depression prevention.
Lower HRV, a potential biomarker of increased sleep reactivity to stress, is associated with greater vulnerability to stress-related sleep disturbances, which, in turn, increases the risk for elevated depressive symptoms in response to chronic stress.
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Estrela et al. (2020) studied this question.
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