Using a subset of participants who recently completed a larger clinical trial, this study compared adherence to physical activity (PA) in a sample of 77 African American (AA) adults, aged 55 to 84, with hypertension. The influence of health measures, physiological measures, depression, and locus of control (LOC) on adherence to PA and a low salt diet were examined.
A cross-sectional descriptive correlation design was employed. AA adults completed a demographic and health tool that included identification of a support person, the amount of perceived support from that person; self-reported adherence to PA on a visual analog scale; the Multidimensional Health Locus of Control Scale; and the Patient Health Question-9 (PHQ-9) Depression Instrument. Physiological data were also collected from the larger clinical trial and included blood pressure (BP); creatinine and potassium serum levels; co-morbidities including diabetes, arthritis, chronic respiratory and chronic kidney disease.
Most of those (63%) with lower PA were less than age 65 and were obese (74%). The only significant univariable relationship with adherence to PA was the PHQ-9 with a moderate negative correlation (r = -.378; p < .001). Using multiple regression, the variables with external LOC explained 26% variance of the adherence to PA (F = 3.378 [8, 68]; p = .003), with creatinine (p < .05), depression (p < .01), and social support for PA (p < .05) significantly influencing the model. Using internal LOC, the model also explained 28% of the variance (F = 3.361 [8, 68]; p = .003). Creatinine level (p < .05), depression (p < .01) and social support for PA (p < .05) significantly contributed to this model as well.
Most of those with lower adherence to a low salt diet were female (n = 27; 73%). The only significant univariable association with low salt diet adherence was the PHQ-9 with a moderate negative correlation (r = -.294; p < .01). Both multiple regression models significantly influenced adherence to low salt diet, with model 1 depicting Internal LOC explaining 23% of the variance in adherence (F = 2.599 [8, 68]; p = .015), and model 2 explaining 24% of the variance in adherence (F = 2.667 [8, 68]; p = .013). Serum potassium level (p < .01) and social support (p < .01) significantly contributed to both internal and external LOC models.
This study identified factors important in PA adherence. Further exploration of serum creatinine levels, depression, and perception of social support as a facilitator of PA adherence warrants further study to gain more understanding about self-management and AAs living with HTN. Further exploration of low salt diet adherence issues with serum potassium levels, social support, and depression warrants further research in the self-management of HTN with the goal of slowing the progression of this silent disease.
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