Etudes Compléments alimentaires
Bénéfices santé des multivitamines
“Effects of a multi-vitamin/mineral supplement on cognitive function and fatigue during extended multi-tasking,”
Haskell CF, Robertson B, et al, Hum Psychopharmacol, 2010 Aug; 25(6): 448-61.
In a randomized, double-blind, placebo-controlled, parallel group study involving 216 females between the ages of 25 and 50 years of age, supplementation with a multivitamin/multimineral (Supradyn®) for a period of 9 weeks was found to have beneficial effects. Prior to intervention, and then again 9 weeks after the intervention commenced, subjects completed a four-module version of the Multi-Tasking Framework, and cognitive function and the modulation of task-related mood/fatigue were assessed during 2 discrete 20 minute assessment periods. A significant attenuation of the adverse effects of extended task completion on mood/fatigue was found among subjects in the multivitamin/multimineral group. Moreover, improved speed and accuracy in multi-task performance was also found among subjects taking the supplements. A subgroup (n=102) of subjects were found to have significant reductions in levels of homocysteine following supplementation. The authors conclude, “These findings suggest that healthy members of the general population may benefit from augmented levels of vitamins/minerals via direct dietary supplementation.”
Extraits de jus de fruits et légumes contre les rhumes
“Reduction of common cold symptoms by encapsulated juice powder concentrate of fruits and vegetables: a randomised, double-blind, placebo-controlled trial,”
Roll S, Nocon M, et al, Br J Nutr, 2010 Aug 23; 1-5; [Epub ahead of print].
In a randomized, double-blind, placebo-controlled study involving 529 healthcare professionals (nursing staff, 80% female, mean age: 40 years), supplementation with an encapsulated juice powder concentrate (4 capsules) for a period of 8 months was found to be associated with a 20% reduction in moderate or severe common cold symptom days. Subjects who received the supplementation had a mean 7.6 days of moderate or severe common cold symptoms, as compared to 9.5 days in the placebo group. The authors conclude, “Intake of a dietary supplement from fruits and vegetables was associated with a 20 % reduction of moderate or severe common cold symptom days in healthcare professionals particularly exposed to patient contact.”
Comment prendre le bicarbonate ?
Effects of Various Sodium Bicarbonate Loading Protocols on the Time-Dependent Extracellular Buffering Profile
Journal of Strength & Conditioning Research: September 2010 - Volume 24 - Issue 9 - pp 2551-2557
Siegler, Jason C; Midgley, Adrian W; Polman, Remco C J; Lever, Robert
Although much research has investigated the types of exercise that are enhanced with sodium bicarbonate (NaHCO3) ingestion, to date, there has been limited research on the dosage and timing of ingestion that optimizes the associated ergogenic effects. This study investigated the effects of various NaHCO3 loading protocols on the time-dependent blood-buffering profile. Eight male volunteers (age, 22.4 ± 5.7 yr; height, 179.8 ± 9.6 cm, body mass, 76.3 ± 14.1 kg) completed Part A, measures of alkalosis throughout 120 minutes after ingestion of various single NaHCO3 dosages (0.3 g·kg−1, 0.2 g·kg−1, 0.1 g·kg−1, and placebo); and Part B, similar profiles after alternative NaHCO3 loading protocols (single morning dosage [SMD], single evening dosage [SED], and dosages ingested on 3 consecutive evenings [CED]). Results from Part A are as follows. Blood buffering in the 0.1 g·kg−1 condition was significantly lower than the 0.2 g·kg−1 and 0.3 g·kg−1 conditions (p < 0.002), but there was no significant differences between the 0.2 g·kg−1 and 0.3 g·kg−1 conditions (p = 0.34). Although the blood buffering was relatively constant in the 0.1 and 0.2 conditions, it was significantly higher at 60 minutes than at 100 minutes and 120 minutes in the 0.3 g·kg−1 condition (p < 0.05). Results from Part B are as follows. Blood buffering for SMD was significantly higher than for SED and CED (p < 0.05). Blood buffering in the SMD condition was significantly lower at 17:00 hours than at 11:00 hours (p = 0.007). The single 0.2 and 0.3 g·kg−1 NaHCO3 dosages appeared to be the most effective for increasing blood-buffering capacity. The 0.2 g·kg−1 dosage is best ingested 40 to 50 minutes before exercise and the 0.3 g·kg−1 dosage 60 minutes before exercise.
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