Table 2. Demographic characteristics of the included studies.
| Studies | Location | Study design | Health status | Gender | Sample size | Duration (wk) | Mean age (yr) | Baseline BMI (kg/m2) | Intervention | Outcome | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Treatment group | Control group | ||||||||||
| Montanari et al. [20] (2021) | Turkey | Randomized, double-blind, placebo-controlled, crossover | Healthy, endurance-trained cyclists | Male | 13 | 1 | 39 | 23.6 | 300 mg New Zealand blackcurrant extract | Placebo | SBP/DBP |
| Montanari et al. [20] (2021) | Turkey | Randomized, double-blind, placebo-controlled, crossover | Healthy, endurance-trained cyclists | Male | 13 | 1 | 39 | 23.6 | 600 mg New Zealand blackcurrant extract | Placebo | SBP/DBP |
| Okamoto et al. [15] (2020) | UK | Randomized, double-blind, placebo-controlled, crossover | Healthy | Both | 14 | 1 | 73.3 | 21.6 | 600 mg New Zealand blackcurrant extract | Placebo | SBP/DBP |
| Khan et al. [16] (2014) | UK | Randomized, double-blind, placebo-controlled, parallel trial | Healthy | Both | 32 | 6 | 53 | 28.8 | 250 mL of low blackcurrant juice drink (6.4% juice) four times a day | Placebo | SBP/DBP |
| Khan et al. [16] (2014) | UK | Randomized, double-blind, placebo-controlled, parallel trial | Healthy | Both | 32 | 6 | 53 | 28.8 | 250 mL of high blackcurrant juice drink (20% juice) four times a day | Placebo | SBP/DBP |
| Ohguro et al. [21] (2012) | Japan | Randomized, placebo-controlled, double-blind | Patients with open-angle glaucoma | Both | 38 | 24 | 61.7 | NA | 50 mg black currant anthocyanins | Placebo | SBP/DBP |
| Heneghan et al. [22] (2017) | Ireland | Randomized, placebo-controlled, crossover | Healthy | Both | 80 | 18 | 57.7 | NA | Blackberry polyphenol enriched beverage [total polyphenol content: –700 mg GAE/250 mL serving/d] | Low-dose polyphenol beverage [< 100 mg GAE/250 mL serving/d] | SBP/DBP |
| Jeong et al. [14] (2016) | Korea | Randomized, double-blind, placebo-controlled | Prehypertensive | Both | 22 | 8 | 57.2 | 24.6 | 1,500 mg, moderate dose black raspberry | Placebo | SBP/DBP |
| Jeong et al. [14] (2016) | Korea | Randomized, double-blind, placebo-controlled | Prehypertensive | Both | 23 | 8 | 57.2 | 24.6 | 2,500 mg, high-dose black raspberry | Placebo | SBP/DBP |
| Cho et al. [23] (2020) | Korea | Randomized, double-blind, placebo-controlled | Borderline-high cholesterol levels | Both | 77 | 12 | 47.3 | 23.5 | 600 mg of freeze-dried rubus coreanus extract | Placebo | SBP/DBP |
| Franck et al. [24] (2020) | Canada | Randomized, placebo-controlled, parallel trial | Slight hyperinsulinemia/hypertriglyceridemia | Both | 48 | 8 | 32.19 | 29.9 | 280 g/day of frozen raspberries | Placebo | SBP/DBP |
| Jeong et al. [25] (2016) | Korea | Randomized, placebo-controlled, parallel trial | Metabolic syndrome | Both | 51 | 12 | 58.5 | 25.3 | 750 mg, black raspberry | Placebo | SBP/DBP |
| Schell et al. [26] (2019) | USA | Randomized, crossover | Type 2 diabetes | Both | 22 | 4 | 54 | 35.3 | 250 g frozen red raspberry | Control meal | SBP/DBP |
BMI, body mass index; SBP, systolic blood pressure; DBP, diastolic blood pressure; GAE, gallic acid equivalents.