Browsing by Author "Kim, Kye"
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- How Long Is Long Enough? Controlling for Acute Caffeine Intake in Cardiovascular ResearchGrant, Shara S.; Kim, Kye; Friedman, Bruce H. (MDPI, 2023-01-29)Caffeine substantially affects cardiovascular functioning, yet wide variability exists in caffeine control procedures in cardiovascular reactivity research. This study was conducted in order to identify a minimal abstention duration in habitual coffee consumers whereby cardiovascular reactivity is unconfounded by caffeine; Six hours (caffeine’s average half-life) was hypothesized. Thirty-nine subjects (mean age: 20.9; 20 women) completed a repeated measures study involving hand cold pressor (CP) and memory tasks. Caffeinated and decaffeinated coffee were administered. The following cardiovascular indices were acquired during pre-task, task, and post-task epochs prior to coffee intake, 30 min-, and six hours post-intake: Heart rate (HR), high-frequency heart rate variability (HF-HRV), root mean squared successive differences (RMSSD), systolic and diastolic blood pressures (SBP, DBP), mean arterial pressure (MAP), pre-ejection period (PEP), left ventricular ejection time (LVET), systemic vascular resistance (SVR), systemic vascular resistance index (SVRI). Results support the adequacy of a six-hour abstention in controlling for caffeine-elicited cardiovascular changes. The current study offers a suggested guideline for caffeine abstention duration in cardiovascular research in psychophysiology. Consistent practice in caffeine abstention protocols would promote validity and reliability across such studies.
- Loneliness: Factors that Clinicians Need to KnowWhitehead, Phyllis B.; Gamuladdin, Shereen; White, Carolyn; Stewart, Christi; Dewitt, Sarah; Kim, Kye (HMP Global, 2021-12-01)
- The Role Taijiquan in Supporting Adaptive Development in AdulthoodKomelski, Matthew F. (Virginia Tech, 2010-03-31)Purpose: Working from lifespan development theory and the theory of Selective Optimization with Compensation (SOC), I provide theoretical analyses to inform and direct research on Taijiquan where research questions involve issues of adaptive development (optimization of gains, maintenance of function, and prevention of lost resources). I also used these frameworks to construct a biopsychosocial mind-body practices model that seeks to explain and predict the role of key aspects (curriculum, practice, context) in Taiji-related development. The above frameworks are further substantiated through a comparative analysis of health status between Taijiquan practitioners (N =120; age range = 24-83, M = 54.77) and a nationally representative sample (N = 414,629; age range = 18-99, M = 54.86) collected by the Centers for Disease Control and Prevention (CDC). The model's predictive potential is explored through an analysis of health status within a subset of experienced Taiji practitioners (N = 94; age range = 24-83, M = 55.82). Design: Theoretical and cross-sectional; between- and within-group comparisons. Methods: Responses from a convenience sample of Taiji practitioners were collected using an online survey. The instrument was designed to collect data on health-related quality of life (HRQoL), lifestyle variables, and Taiji practice regimens. Data from Taiji practitioners were merged with the CDC's 2008 Behavioral Risk Factor Surveillance System (BRFSS) dataset, forming three groups: no exercise, some exercise, and Taiji exercise. Health status was regressed on exercise group while controlling for age, income, and education, as well as the interaction between age and exercise group. Further analyses were also conducted on a subset of the Taiji data (N=94). These analyses examined the relationships among self-reported health, practice regimens, and diet while controlling for age and experience. Results: In the first set of analyses (see paper one), I controlled for the effects of age, income, education, and the differential effects of age on exercise group, while determining associations between health and group membership. A significant interaction effect (p < 0.001) occurred between age and exercise group membership. This interaction showed little difference between exercise groups in the young adult age range, but among older adults, Taijiquan practitioners displayed the best HRQoL. In the second set of analyses (see paper 2), I found significant interaction effects between (a) curricular complexity and out-of-class practice (p < 0.05) and (b) curricular complexity and diet (p < 0.05). Conclusions: The extraordinary health status trajectory among Taiji practitioners may be attributable to several conditions including: (a) the implied presence of SOC-related strategies, (b) the general benefits of psychophysical expertise, and (c) concomitant structure between Taiji-related goals and health behaviors that contributes to optimal aging. Specifically, intervention designers, Taiji teachers, and practitioners should consider the potential benefits of well rounded Taiji curricula, regular out-of-class practice, and healthy diet for optimizing health-related gains and minimizing losses typically associated with aging.