From guidelines to real life: interpreting rest requirements in home blood pressure monitoring

Dear Editor, We read with great interest the article by Kim et al. evaluating compliance with and the impact of a 5-minute seated rest protocol on home blood pressure monitoring (HBPM) in postpartum women.1 The authors should be commended for their innovative use of thigh-worn accelerometers to objectively quantify pre-measurement posture, addressing a long-standing limitation in HBPM research. Their findings that noncompliance with the recommended rest period resulted in statistically small and clinically modest blood pressure differences are provocative and highly relevant to real-world postpartum care. Several methodological considerations, however, merit closer examination. First, the study population largely consisted of women with low to normal blood pressure values, with mean systolic blood pressures well below diagnostic thresholds for hypertension. In such a narrow and normotensive range, physiological variability introduced by inadequate rest may be intrinsically attenuated. Prior work has demonstrated that rest duration exerts a more pronounced effect on blood pressure measurements at higher baseline blood pressures, particularly in people with hypertension or high-risk populations.2 Consequently, the conclusion that noncompliance has minimal clinical impact may not be generalizable to postpartum women with persistent hypertension, preeclampsia, or masked hypertension.