Whether this is related to the, age, lifestyle or nutritional factors of the test subjects is not known. The influence of subject background is discussed also in the review of Boelsma and Kloek [85]. Finally, many reports on clinical trials have concentrated mainly on the changes in blood pressure. Vascular effects and other variables, e.g., in clinical chemistry, have received less attention especially during the intervention. All these aspects should be taken into consideration when the message and thevalue of single clinical intervention study are evaluated e.g., for a meta-analysis. To get collective data on the clinical studies of antihypertensive peptides, the reader is referred to the two abovementioned meta-analyses.
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