QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Online Supporting Material Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Lamprecht, M. Articles by Greilberger, J. F. Search for Related Content PubMed PubMed Citation Articles by Lamprecht, M. Articles by Greilberger, J. F.

---

Nutrient Requirements and Optimal Nutrition

Several Indicators of Oxidative Stress, Immunity, and Illness Improved in Trained Men Consuming an Encapsulated Juice Powder Concentrate for 28 Weeks^1–3,

⁴ Styrian Health Association, 8010 Graz, Austria; ⁵ Institute of Physiological Chemistry, and ⁶ Institute of Physiology, Medical University of Graz, 8010 Graz, Austria; ⁷ Institute of Sports Science, Karl Franzens University of Graz, 8010 Graz, Austria; and ⁸ Human Performance Research^Graz, Karl Franzens University and Medical University of Graz, 8010 Graz, Austria

^* To whom correspondence should be addressed. E-mail: manfred.lamprecht{at}meduni-graz.at.

Phytonutrients from plant foods provide numerous antioxidants. We hypothesized that supplementation for 28 wk with a commercially available encapsulated juice powder concentrate (JPC) could influence indicators of oxidative stress, immunity, and illness. Trained men (n = 41; 34 ± 5 y; maximum oxygen uptake = 55 ± 7 mL·kg^–1·min^–1) from a homogenous police Special Forces unit were randomly assigned in a double blind manner to either JPC (n = 21) or placebo (n = 20). We used multiple 7-d food records to assess dietary intake and found inadequate mean daily fruit and vegetable consumption (3.2 ± 1.2 servings). The group physician documented all duty days lost due to illness. We collected plasma at baseline and study wk 4, 8, 16, and 28 for analysis of carbonyl groups on protein (CP) and TNF. Over the 28-wk investigation, CP was lower in the JPC group, with both a treatment and a time x treatment interaction (P < 0.05). Concentrations of both CP and TNF at 16 and 28 wk were lower in the JPC than in the placebo group (P < 0.001). TNF increased during the first 8 wk followed by a decrease in both groups for the following 20 wk (P < 0.001). Over the final 20 wk of the study, the placebo group tended to have more days of illness than the JPC group (P = 0.068). These data suggest beneficial JPC effects with regard to reduction of duty days lost due to illness and reduction of CP and TNF concentrations in this group of trained men over 28 wk.