Key result
Dietary fiber (oat bran) supplementation (30 g/d) added to a DASH diet significantly lowered 24-hour maximum heart rate at 3 months compared to DASH diet alone in patients with hypertension.
Why the study?
Hypertension management includes controlling increased heart rate in addition to lowering blood pressure, but whether dietary fiber supplementation can lower heart rate in patients with hypertension was unknown.
Does oat bran supplementation reduce heart rate in patients with essential hypertension?
RCT (n=70)
Randomized
Does oat bran supplementation reduce heart rate in patients with essential hypertension?
Dietary fiber supplementation with oat bran added to a DASH diet significantly lowers maximum heart rate in patients with essential hypertension.
Supports oat bran with DASH diet to lower peak 24-hour heart rate in hypertension; extends evidence for fiber in cardiovascular risk modification.
(1) Background: The management goal for patients with essential hypertension (HTN) is not only to lower blood pressure (BP), but also to control increased heart rate (HR). In a previous study, it was found that dietary fiber (DF) supplementation can effectively reduce BP in patients with HTN. The aim of this study was to determine whether a DF supplement can lower HR in patients with HTN. (2) Methods: Seventy patients who met the inclusion and exclusion criteria were randomly allocated into the control group (n = 34) and the intervention group (n = 36). The regular DASH dietary care was delivered to both groups of patients. In addition, one bag of oat bran (30 g/d, containing DF 8.9 g) was delivered to the intervention group. The 24 h ambulatory heart rate was measured at baseline and 3 months. (3) Results: At 3 months, the 24 h maximum heart rate (24h maxHR) in the intervention group was significantly lower than that in the control group. After the intervention, within-group comparisons in the intervention group revealed that there were significant reductions in the 24 h average heart rate (24h aveHR), 24h maxHR, average heart rate during day time (D-aveHR), minimum heart rate during day time (D-minHR), and maximum heart rate during day time (D-maxHR). Similar differences were not found in the control group. (4) Conclusions: Dietary fiber (oat bran) supplementation might be beneficial in lowering HR in patients with HTN.
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Ju et al. (2022) conducted an RCT in Essential hypertension (n=70). Dietary fiber (oat bran) supplement vs. Regular DASH dietary care was evaluated on 24 h ambulatory heart rate. Dietary fiber (oat bran) supplementation (30 g/d) added to a DASH diet significantly lowered 24-hour maximum heart rate at 3 months compared to DASH diet alone in patients with hypertension.
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