Gritty Heart: Improved Heart Rate Variability Markers of Adaptive Physiological Response in Grit
Jaehoon Yoo, B. Moon Kim, Sujin Park, J. A. Jeon, Chaebin Yoo, M. Justin Kim, Daeun Park
Grit is a personality trait, conceptualized as perseverance of effort and consistency of interests in long-term goals. Previous research has shown that grit is associated with various positive outcomes, including well-being. Despite extensive research on grit, most studies relied on self-reported measures rather than objective measures. To address this gap, our study investigated the relationship between grit and physiological responses, focusing on resting-state heart rate variability (HRV)-a physiological marker of well-being and adaptability. Additionally, we examined whether this relationship was unique to grit and not explained by other related psychological constructs (i.e., conscientiousness and self-control). A total of 206 healthy college students participated in this study (M<sub>age</sub> = 21.03, SD = 2.48, age range = 18-33; 111 women). Results of hierarchical regression analyses showed that grit significantly predicted resting-state HRV measures (i.e., RMSSD, SDNN, and HF) even after controlling for conscientiousness, self-control, age, gender, and respiration rate. These findings suggest that grit may play an important role in maintaining improved biological responses in daily life, beyond the effects of neighboring constructs.
https://doi.org/10.1111/psyp.70064
Grit
Psychology
Conscientiousness
Heart rate variability
Personality
Big Five personality traits
Trait
Developmental psychology
Adaptability
Multilevel model
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