The effects of Energised Greens™ upon blood acid-base balance during resting conditions

Journal Title (Medline/Pubmed accepted abbreviation): J. Intl. Soc. Sports Nutr.
Year: 2011
Volume: 8
First Page: 14

Summary of background and research design:

Background:High intensity exercise is associated with decreased pH (increased acidity) in muscle and may affect blood pH as well. In order to attenuate the increase in acidity in the blood,ingestion of alkaline compounds and/or agents that help buffer the blood (ex. sodium bicarbonate) have been recommended. However, these compounds can also lead to gastrointestinal discomfort, which nullifies the potential for increased performance. Energised Greens™ is a supplement composed of fruit and vegetable concentrate (FVC) that has been proposed to help control blood pH.  

Hypothesis: The recommended dose of a fruit and vegetable concentrate will decrease blood pH similarly as a “standard” dose of sodium bicarbonate (0.1 g/kg body weight).

Subjects:Eight recreationally active men, age 23 ± 2 y

Experimental design: randomized, cross-over, placebo-controlled design 

Treatments: Energised Greens™ (9 g/dose), sodium bicarbonate (0.1 g/kg body weight), or a placebo (flour). Supplements were provided in capsule form.

Protocol: The participants reported to the laboratory after an overnight fast. They relaxed for 15 min, then a baseline blood sample was acquired (capillary blood sample via finger stick). The participants ingested 750 (about 3 cups) of water with the treatment within 15 min. Blood samples were collected every 15 min for 2 hrs. During this time, the participants completed questionnaires regarding gastrointestinal comfort.

Summary of research findings:
  • Sodium bicarbonate increased the pH (increased the alkalinity, decreased the acidity) of the blood during the 2 hrs. Blood pH was unaffected by FVC or placebo supplementation.
  • There were large differences in gastrointestinal discomfort between subjects, thus making it difficult to detect any significant effects between treatments.

Interpretation of findings/Key practice applications:

Energised Greens™ fruit and vegetable concentrate did not induce alkalosis. The participants in this study did not exercise, however, so it is unknown how this supplement would function in an exercise setting.


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