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BMJ (Clinical Research Ed.) Aug 2016To systematically review studies quantifying the associations of long term (clinic), mid-term (home), and short term (ambulatory) variability in blood pressure,... (Meta-Analysis)
Meta-Analysis Review
OBJECTIVE
To systematically review studies quantifying the associations of long term (clinic), mid-term (home), and short term (ambulatory) variability in blood pressure, independent of mean blood pressure, with cardiovascular disease events and mortality.
DATA SOURCES
Medline, Embase, Cinahl, and Web of Science, searched to 15 February 2016 for full text articles in English.
ELIGIBILITY CRITERIA FOR STUDY SELECTION
Prospective cohort studies or clinical trials in adults, except those in patients receiving haemodialysis, where the condition may directly impact blood pressure variability. Standardised hazard ratios were extracted and, if there was little risk of confounding, combined using random effects meta-analysis in main analyses. Outcomes included all cause and cardiovascular disease mortality and cardiovascular disease events. Measures of variability included standard deviation, coefficient of variation, variation independent of mean, and average real variability, but not night dipping or day-night variation.
RESULTS
41 papers representing 19 observational cohort studies and 17 clinical trial cohorts, comprising 46 separate analyses were identified. Long term variability in blood pressure was studied in 24 papers, mid-term in four, and short-term in 15 (two studied both long term and short term variability). Results from 23 analyses were excluded from main analyses owing to high risks of confounding. Increased long term variability in systolic blood pressure was associated with risk of all cause mortality (hazard ratio 1.15, 95% confidence interval 1.09 to 1.22), cardiovascular disease mortality (1.18, 1.09 to 1.28), cardiovascular disease events (1.18, 1.07 to 1.30), coronary heart disease (1.10, 1.04 to 1.16), and stroke (1.15, 1.04 to 1.27). Increased mid-term and short term variability in daytime systolic blood pressure were also associated with all cause mortality (1.15, 1.06 to 1.26 and 1.10, 1.04 to 1.16, respectively).
CONCLUSIONS
Long term variability in blood pressure is associated with cardiovascular and mortality outcomes, over and above the effect of mean blood pressure. Associations are similar in magnitude to those of cholesterol measures with cardiovascular disease. Limited data for mid-term and short term variability showed similar associations. Future work should focus on the clinical implications of assessment of variability in blood pressure and avoid the common confounding pitfalls observed to date.
SYSTEMATIC REVIEW REGISTRATION
PROSPERO CRD42014015695.
Topics: Blood Pressure; Blood Pressure Determination; Blood Pressure Monitoring, Ambulatory; Cardiovascular Diseases; Cause of Death; Humans
PubMed: 27511067
DOI: 10.1136/bmj.i4098 -
British Journal of Sports Medicine Oct 2023To perform a large-scale pairwise and network meta-analysis on the effects of all relevant exercise training modes on resting blood pressure to establish optimal... (Meta-Analysis)
Meta-Analysis Review
OBJECTIVE
To perform a large-scale pairwise and network meta-analysis on the effects of all relevant exercise training modes on resting blood pressure to establish optimal antihypertensive exercise prescription practices.
DESIGN
Systematic review and network meta-analysis.
DATA SOURCES
PubMed (Medline), the Cochrane library and Web of Science were systematically searched.
ELIGIBILITY CRITERIA
Randomised controlled trials published between 1990 and February 2023. All relevant work reporting reductions in systolic blood pressure (SBP) and/or diastolic blood pressure (DBP) following an exercise intervention of ≥2 weeks, with an eligible non-intervention control group, were included.
RESULTS
270 randomised controlled trials were ultimately included in the final analysis, with a pooled sample size of 15 827 participants. Pairwise analyses demonstrated significant reductions in resting SBP and DBP following aerobic exercise training (-4.49/-2.53 mm Hg, p<0.001), dynamic resistance training (-4.55/-3.04 mm Hg, p<0.001), combined training (-6.04/-2.54 mm Hg, p<0.001), high-intensity interval training (-4.08/-2.50 mm Hg, p<0.001) and isometric exercise training (-8.24/-4.00 mm Hg, p<0.001). As shown in the network meta-analysis, the rank order of effectiveness based on the surface under the cumulative ranking curve (SUCRA) values for SBP were isometric exercise training (SUCRA: 98.3%), combined training (75.7%), dynamic resistance training (46.1%), aerobic exercise training (40.5%) and high-intensity interval training (39.4%). Secondary network meta-analyses revealed isometric wall squat and running as the most effective submodes for reducing SBP (90.4%) and DBP (91.3%), respectively.
CONCLUSION
Various exercise training modes improve resting blood pressure, particularly isometric exercise. The results of this analysis should inform future exercise guideline recommendations for the prevention and treatment of arterial hypertension.
Topics: Humans; Antihypertensive Agents; Blood Pressure; Exercise; Hypertension; Network Meta-Analysis; Randomized Controlled Trials as Topic
PubMed: 37491419
DOI: 10.1136/bjsports-2022-106503 -
Mayo Clinic Proceedings Mar 2014To conduct a systematic review and meta-analysis quantifying the effects of isometric resistance training on the change in systolic blood pressure(SBP), diastolic blood... (Meta-Analysis)
Meta-Analysis Review
OBJECTIVE
To conduct a systematic review and meta-analysis quantifying the effects of isometric resistance training on the change in systolic blood pressure(SBP), diastolic blood pressure (DBP), and mean arterial pressure in subclinical populations and to examine whether the magnitude of change in SBP and DBP was different with respect to blood pressure classification.
PATIENTS AND METHODS
We conducted a systematic review and meta-analysis of randomized controlled trials lasting 4 or more weeks that investigated the effects of isometric exercise on blood pressure in healthy adults (aged ≥18 years) and were published in a peer-reviewed journal. PubMed, CINAHL, and the Cochrane Central Register of Controlled Trials were searched for trials reported between January 1, 1966, and July 31, 2013. We included 9 randomized trials, 6 of which studied normotensive participants and 3 that studied hypertensive patients, that included a total of 223 participants (127 who underwent exercise training and 96 controls).
RESULTS
The following reductions were observed after isometric exercise training: SBP-mean difference (MD), -6.77 mm Hg (95% CI, -7.93 to -5.62 mm Hg; P<.001); DBP-MD, -3.96 mm Hg (95% CI, -4.80 to -3.12 mm Hg; P<.001); and mean arterial pressure-MD, -3.94 mm Hg (95% CI, -4.73 to -3.16 mm Hg; P<.001). A slight reduction in resting heart rate was also observed (MD, -0.79 beats/min; 95% CI, -1.23 to -0.36 beats/min; P=.003).
CONCLUSION
Isometric resistance training lowers SBP, DBP, and mean arterial pressure. The magnitude of effect is larger than that previously reported in dynamic aerobic or resistance training. Our data suggest that this form of training has the potential to produce significant and clinically meaningful blood pressure reductions and could serve as an adjunctive exercise modality.
Topics: Adult; Blood Pressure; Blood Pressure Determination; Exercise; Humans; Hypertension; Models, Statistical; Randomized Controlled Trials as Topic
PubMed: 24582191
DOI: 10.1016/j.mayocp.2013.10.030 -
Advances in Nutrition (Bethesda, Md.) Nov 2017Beetroot is considered a complementary treatment for hypertension because of its high content of inorganic NO This systematic review and meta-analysis aimed to clarify... (Meta-Analysis)
Meta-Analysis Review
Beetroot is considered a complementary treatment for hypertension because of its high content of inorganic NO This systematic review and meta-analysis aimed to clarify several aspects of beetroot juice supplementation on systolic blood pressure (SBP) and diastolic blood pressure (DBP). We searched PubMed, Scopus, and Embase databases, and the reference lists of previous reviews. Randomized clinical trials that investigated the effects of beetroot juice on resting blood pressure in humans were recruited for quality assessment, meta-analyses, subgroup analyses, and meta-regressions; of these, 22 were conducted between 2009 and 2017 and included a total of 47 intervention ( = 650) and 43 control ( = 598) groups. Overall, SBP (-3.55 mm Hg; 95% CI: -4.55, -2.54 mm Hg) and DBP (-1.32 mm Hg; 95% CI: -1.97, -0.68 mm Hg) were significantly lower in the beetroot juice-supplemented groups than in the control groups. The mean difference of SBP was larger between beetroot juice-supplemented and control groups in the longer than in the shorter (≥14 compared with <14 d) study durations (-5.11 compared with -2.67 mm Hg) and the highest compared with the lowest (500 compared with 70 and 140 mL/d) doses of beetroot juice (-4.78 compared with -2.37 mm Hg). A positive correlation was observed between beetroot juice doses and the mean differences of blood pressures. In contrast, a smaller effect size of blood pressures was observed after supplementation with higher NO (milligrams per 100 mL beetroot juice). A weak effect size was observed in a meta-analysis of trials that used NO-depleted beetroot juice as a placebo compared with other interventions (-3.09 compared with -4.51 mm Hg for SBP and -0.81 compared with -2.01 mm Hg for DBP). Our results demonstrate the blood pressure-lowering effects of beetroot juice and highlight its potential NO-independent effects.
Topics: Adult; Antihypertensive Agents; Beta vulgaris; Blood Pressure; Dietary Supplements; Female; Fruit and Vegetable Juices; Humans; Hypertension; Male; Middle Aged; Nitrates
PubMed: 29141968
DOI: 10.3945/an.117.016717 -
Current Hypertension Reports Apr 2023Hypertension is the primary risk factor for cardiovascular disease and adequate blood pressure control is often elusive. The objective of this work was to conduct a... (Meta-Analysis)
Meta-Analysis Review
PURPOSE OF REVIEW
Hypertension is the primary risk factor for cardiovascular disease and adequate blood pressure control is often elusive. The objective of this work was to conduct a meta-analysis of trial data of isometric resistance training (IRT) studies in people with hypertension, to establish if IRT produced an anti-hypertensive effect. A database search (PubMed, CINAHL, Cochrane Central Register of Controlled Trials, and MEDLINE) identified randomised controlled and crossover trials of IRT versus a sedentary or sham control group in adults with hypertension.
RECENT FINDINGS
We included 12 studies (14 intervention groups) in the meta-analyses, with an aggregate of 415 participants. IRT reduced systolic blood pressure (SBP), mean difference (MD) - 7.47 mmHg (95%CI - 10.10, - 4.84), P < 0.01; diastolic blood pressure (DBP) MD - 3.17 mmHg (95%CI - 5.29, - 1.04), P < 0.01; and mean arterial blood pressure (MAP) MD - 7.19 mmHg (95%CI - 9.06, - 5.32), P < 0.0001. Office pulse pressure and resting heart rate was not significantly reduced, neither were 24-h or day-time ambulatory blood pressures (SBP, DBP). Night-time blood pressures, however, were significantly reduced with SBP MD - 4.28 mmHg (95%CI - 7.88, - 0.67), P = 0.02, and DBP MD - 2.22 mmHg (95%CI - 3.55, - 0.88), P < 0.01. IRT does lower SBP, DBP and MAP office and night-time ambulatory SBP and DBP, but not 24-h mean ambulatory blood pressures in people with hypertension.
Topics: Adult; Humans; Hypertension; Resistance Training; Blood Pressure; Cardiovascular Diseases; Hypotension
PubMed: 36853479
DOI: 10.1007/s11906-023-01232-w -
Nutrition, Metabolism, and... Dec 2014Findings were not consistent on the therapeutic effect of Dietary Approaches to Stop Hypertension (DASH) diet on blood pressure. We aimed to review systematically and... (Meta-Analysis)
Meta-Analysis Review
BACKGROUND AND AIMS
Findings were not consistent on the therapeutic effect of Dietary Approaches to Stop Hypertension (DASH) diet on blood pressure. We aimed to review systematically and perform a meta-analysis to assess the magnitude of the effect of the DASH diet on blood pressure in randomized controlled trials (RCTs) among adults.
METHODS AND RESULTS
We conducted a systematic review and random effects meta-analysis of all RCTs which evaluated the effect of the DASH diet on blood pressure including published papers until June 2013, using PubMed, ISI Web of Science, Scopus and Google scholar database. Subgroup analysis and meta-regression were used to find out possible sources of between-study heterogeneity. Seventeen RCTs contributing 20 comparisons with 2561 participants were included. Meta-analysis showed that the DASH diet significantly reduced systolic blood pressure by 6.74 mmHg (95%CI: -8.25, -5.23, I(2) = 78.1%) and diastolic blood pressure by 3.54 mmHg (95%CI: -4.29, -2.79, I(2) = 56.7%). RCTs with the energy restriction and those with hypertensive subjects showed a significantly greater decrease in blood pressure. Meta-regression showed that mean baseline of SBP and DBP was explained 24% and 49% of the variance between studies for SBP and DBP, respectively.
CONCLUSION
The results revealed the profitable reducing effect of the DASH-like diet on both systolic and diastolic blood pressure in adults; although there was a variation in the extent of the fall in blood pressure in different subgroups.
Topics: Adult; Aged; Blood Pressure; Diet; Female; Humans; Hypertension; Male; Middle Aged; Randomized Controlled Trials as Topic
PubMed: 25149893
DOI: 10.1016/j.numecd.2014.06.008 -
BMJ (Clinical Research Ed.) Feb 2020To examine the dose-response relation between reduction in dietary sodium and blood pressure change and to explore the impact of intervention duration. (Meta-Analysis)
Meta-Analysis
OBJECTIVE
To examine the dose-response relation between reduction in dietary sodium and blood pressure change and to explore the impact of intervention duration.
DESIGN
Systematic review and meta-analysis following PRISMA guidelines.
DATA SOURCES
Ovid MEDLINE(R), EMBASE, and Cochrane Central Register of Controlled Trials (Wiley) and reference lists of relevant articles up to 21 January 2019.
INCLUSION CRITERIA
Randomised trials comparing different levels of sodium intake undertaken among adult populations with estimates of intake made using 24 hour urinary sodium excretion.
DATA EXTRACTION AND ANALYSIS
Two of three reviewers screened the records independently for eligibility. One reviewer extracted all data and the other two reviewed the data for accuracy. Reviewers performed random effects meta-analyses, subgroup analyses, and meta-regression.
RESULTS
133 studies with 12 197 participants were included. The mean reductions (reduced sodium usual sodium) of 24 hour urinary sodium, systolic blood pressure (SBP), and diastolic blood pressure (DBP) were 130 mmol (95% confidence interval 115 to 145, P<0.001), 4.26 mm Hg (3.62 to 4.89, P<0.001), and 2.07 mm Hg (1.67 to 2.48, P<0.001), respectively. Each 50 mmol reduction in 24 hour sodium excretion was associated with a 1.10 mm Hg (0.66 to 1.54; P<0.001) reduction in SBP and a 0.33 mm Hg (0.04 to 0.63; P=0.03) reduction in DBP. Reductions in blood pressure were observed in diverse population subsets examined, including hypertensive and non-hypertensive individuals. For the same reduction in 24 hour urinary sodium there was greater SBP reduction in older people, non-white populations, and those with higher baseline SBP levels. In trials of less than 15 days' duration, each 50 mmol reduction in 24 hour urinary sodium excretion was associated with a 1.05 mm Hg (0.40 to 1.70; P=0.002) SBP fall, less than half the effect observed in studies of longer duration (2.13 mm Hg; 0.85 to 3.40; P=0.002). Otherwise, there was no association between trial duration and SBP reduction.
CONCLUSIONS
The magnitude of blood pressure lowering achieved with sodium reduction showed a dose-response relation and was greater for older populations, non-white populations, and those with higher blood pressure. Short term studies underestimate the effect of sodium reduction on blood pressure.
SYSTEMATIC REVIEW REGISTRATION
PROSPERO CRD42019140812.
Topics: Blood Pressure; Blood Pressure Determination; Diet, Sodium-Restricted; Dose-Response Relationship, Drug; Humans; Hypertension; Randomized Controlled Trials as Topic; Sodium Chloride, Dietary
PubMed: 32094151
DOI: 10.1136/bmj.m315 -
Scientific Reports Jan 2023Cardiovascular diseases are the leading cause of death in the world and arterial hypertension (AH) accounts for 13.8% of deaths caused by cardiovascular diseases.... (Meta-Analysis)
Meta-Analysis
Cardiovascular diseases are the leading cause of death in the world and arterial hypertension (AH) accounts for 13.8% of deaths caused by cardiovascular diseases. Strength training interventions could be an important alternative tool for blood pressure control, however, consistent evidence and the most effective training protocol for this purpose are yet to be established. The current study used the Cochrane methodology to systematically review randomized controlled trials (RCTs) that investigated the effect of strength training on blood pressure in hypertensive patients. A systematic search was conducted in the PubMed, EMBASE, Scopus, Cochrane Library, and World Health Organization databases. This review included controlled trials that evaluated the effect of strength training for 8 weeks or more in adults with arterial hypertension, published up to December 2020. Data are described and reported as the weighted mean difference of systolic and diastolic pressure and a 95% confidence interval. Protocol registration: PROSPERO registration number CRD42020151269. A total of 14 studies were identified, including a combined total of 253 participants with hypertension. The meta-analysis showed that mean values of systolic blood pressure (SBP) and diastolic blood pressure (DBP) decreased significantly after strength training interventions. The strongest effect of strength training on decreasing blood pressure was observed in protocols with a moderate to vigorous load intensity (> 60% of one-repetition maximum-1RM), a frequency of at least 2 times per week, and a minimum duration of 8 weeks. We concluded that strength training interventions can be used as a non-drug treatment for arterial hypertension, as they promote significant decreases in blood pressure.
Topics: Adult; Humans; Cardiovascular Diseases; Resistance Training; Randomized Controlled Trials as Topic; Hypertension; Blood Pressure
PubMed: 36604479
DOI: 10.1038/s41598-022-26583-3 -
Clinical Research in Cardiology :... Aug 2016Recent evidence suggests that pulse pressure (PP) is a strong cardiovascular diseases' risk factor. We systematically evaluated all relevant studies to determine whether... (Meta-Analysis)
Meta-Analysis Review
BACKGROUND
Recent evidence suggests that pulse pressure (PP) is a strong cardiovascular diseases' risk factor. We systematically evaluated all relevant studies to determine whether PP can be used as an independent predictor of stroke and mortality.
METHODS AND RESULTS
A meta-analysis was performed by searching the published literature using MEDLINE, Cochrane and Google Scholar databases up to December 15, 2015. We measured the effect size expressed by hazard ratio (HR) and 95 % confidence interval (95 % CI). Eleven publications were included in the analysis. Pooled results demonstrated that 10 mmHg increase in PP was associated with increased risk of stroke occurrence (pooled HR 1.046, 95 % CI 1.025-1.068, P < 0.001). Additionally, systolic blood pressure (SBP) (pooled HR 1.053, 95 % CI 1.033-1.073, P < 0.001) and diastolic blood pressure (DPB) (pooled HR 1.056, 95 % CI 1.038-1.074, P < 0.001) were found to be significant predictors for stroke. We did not find a significant association between PP and all-cause mortality (pooled HR 1.022, 95 % CI 0.983-1.063, P = 0.270). We found SBP (pooled HR 1.008, 95 % CI 1.002-1.014, P = 0.012), but not DBP (pooled HR 1.023, 95 % CI 0.964-1.085, P = 0.451) to be significantly associated with all-cause mortality.
CONCLUSIONS
Current data confirms that PP is an independent risk factor for stroke but is not a predictor of mortality.
Topics: Adult; Aged; Aged, 80 and over; Blood Pressure; Female; Humans; Hypertension; Male; Middle Aged; Prognosis; Risk Assessment; Risk Factors; Stroke
PubMed: 26902972
DOI: 10.1007/s00392-016-0972-2 -
Sleep Medicine Reviews Oct 2022Obstructive sleep apnea (OSA) is an established risk factor for high blood pressure (BP) in adults. However, it remains unclear whether the same association could be... (Meta-Analysis)
Meta-Analysis Review
Obstructive sleep apnea (OSA) is an established risk factor for high blood pressure (BP) in adults. However, it remains unclear whether the same association could be found in children and adolescents. Therefore, we conducted a systematic review and meta-analysis of observational studies to evaluate the associations between childhood OSA and BP outcomes. The review protocol was registered in PROSPERO (CRD42021225683). We performed a systematic literature search to identify relevant cross-sectional and longitudinal studies up to July 6, 2021. Of the 4902 identified articles, a total of 12 cross-sectional studies and 2 cohort studies were included in the final analyses. In the cross-sectional analyses, the mean systolic BP (SBP) were significantly higher in children with mild or moderate-to-severe OSA compared to the healthy controls, and these effects were more pronounced during the nighttime. In prospective studies, moderate-to-severe childhood OSA was associated with a risk of elevated SBP in adulthood (Mean difference = 4.02 mm Hg, 95% CI = 1.32 to 6.72). Taken together, our results suggest that moderate-to-severe childhood OSA is associated with a higher risk of adverse SBP outcomes. Early detection and treatment of OSA may promote cardiovascular health in children and adolescents and possibly in future adulthood.
Topics: Adolescent; Adult; Blood Pressure; Child; Cross-Sectional Studies; Humans; Hypertension; Polysomnography; Prospective Studies; Sleep Apnea, Obstructive
PubMed: 36087456
DOI: 10.1016/j.smrv.2022.101663