The shift-and-persist model has emerged in order to account for unintuitive, positive health outcomes in some individuals of low socioeconomic status. A large body of research has previously linked low socioeconomic status to poor physical and mental health outcomes, including early mortality. Low socioeconomic status is hypothesized to get "under the skin" by producing chronic activation of the sympathetic nervous system and hypothalamic–pituitary–adrenal axis, which increases allostatic load, leading to the pathogenesis of chronic disease. However, some individuals of low socioeconomic status do not appear to experience the expected, negative health effects associated with growing up in poverty. To account for this, the shift-and-persist model proposes that, as children, some individuals of low socioeconomic status learn adaptive strategies for regulating their emotions ("shifting") and focusing on their goals ("persisting") in the face of chronic adversity. According to this model, the use of shift-and-persist strategies diminishes the typical negative effects of adversity on health by leading to more adaptive biological, cognitive, and behavioral responses to daily stressors.
Shift strategies Broadly, "shift" strategies encompass a variety of cognitive and emotion self-regulation approaches that individuals use to deal with stress, including cognitive restructuring, reframing, reappraisal, and acceptance strategies, which change the meaning of a stressor or reduce its emotional impact. These shift strategies particularly focus on changing one's response to a stressor, instead of attempting to change the situation or stressor itself. As shift strategies depend more on internal processes (self-control and regulation), than external resources, it is hypothesized that shift strategies may be particularly adaptive responses to the chronic, uncontrollable stressors that are associated with low socioeconomic status.
Persist strategies According to Chen and Miller, "persist" strategies are any strategies that help individuals to maintain optimism about the future, create meaning from their experiences of challenge and hardship, and persist "with strength in the face of adversity."
Measurement To evaluate the combination of shift-and-persist strategy use, distinct "shift" and "persist" constructs were initially measured separately by using multiple, self-report measures of reappraisal, emotional reactivity, and future orientation in early research on this model. In 2015, Chen and colleagues published the Shift-and-Persist Scale, which is a combined self-report measure that assesses both shift and persist strategies. The Shift-and-Persist Scale has been validated for use with adults and teenagers. The questionnaire asks respondents to rate how well 14 statements about various approaches to dealing with life stressors apply to them on a 1-4 scale. Out of the 14 items on the measure, 4 assess a respondent's use of shift strategies, 4 load onto persist strategies, and 6 items are non-relevant distractors that are ignored during scoring. When scoring the Shift-and-Persist Scale, one item (#4) is reverse-scored. This scale is publicly available online. A simplified 5-item Shift-and-Persist scale has also been published for use with younger children and adolescents (ages 9–15). Total scores on this version of the Shift-and-Persist Scale range from 0-20, such that higher scores are indicative of greater use of shift-and-persist strategies. This scale is also publicly available online and has been previously used in research with children from kindergarten through 8th grade.
Proposed mechanisms
Reduction of the harmful biological effects of stress The shift-and-persist model mainly hypothesizes that these strategies have protective effects for the health of low socioeconomic status individuals because they affect biological and physiological stress response tendencies that are relevant for disease. There is some evidence that shift responses (e.g., reappraisal) to acute stressors are associated with attenuated physiological responses to stress, including reduced cardiovascular reactivity. Specifically, reappraisal has been linked to a "healthier" pattern of hypothalamic–pituitary–adrenal axis response characterized by a rapid return to homeostasis (i.e., faster cortisol recovery) in the wake of a stressor. Persist tendencies, such as optimism, have also been associated with adaptive immune responses and faster cortisol recovery. By constraining the magnitude and duration of biological stress responses, including cardiovascular, hypothalamic–pituitary–adrenal axis, and inflammatory responses to stress, shift-and-persist responses are hypothesized to prevent the wear and tear on these systems that increases allostatic load and risk for chronic diseases of aging. Cross-sectional studies provide some evidence that greater emotion regulation abilities are associated with reduced health risk on a variety of indicators of allostatic load. Similarly, self-reported trait levels of optimism and purpose in life have been linked to better concurrent health and health trajectories over time. However, most of the health benefits associated with shift-and-persist consistent strategies are only seen in low socioeconomic status samples.
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