Voeding en gezondheid

Creatinesupplementen verbetert de krachtprestatie geleverd door de bovenste ledematen

Afbeelding

Onderzoeksvraag:
Verbetert het slikken van creatine de krachtprestatie, welke geleverd wordt door de bovenste ledematen?

Studieopzet:
Dit overzichtsartikel bevatte 53 RCT’s met in totaal 563 mensen in de creatinegroep en 575 mensen in de controlegroep.

Resultaten en conclusies:
De onderzoekers vonden dat het slikken van creatine de effectiviteit van de bench press (een fitness oefening) deed toenemen [ES = 0.265, 95% BI = 0.132-0.398, p 0.001].

De onderzoekers vonden dat het slikken van creatine de effectiviteit van de chest press (een fitness oefening) deed toenemen [ES = 0.677, 95 % BI = 0.149-1.206, p = 0.012].

De onderzoekers concludeerden dat het slikken van creatine de krachtprestatie welke geleverd wordt door de bovenste ledematen bij sportoefeningen korter dan 3 minuten verbeterde. Deze verbeterde krachtprestatie was onafhanelijk van de bevolkingsgroepen, sportprotocol en de duur en dosis van de creatinesuppletie.

Oorspronkelijke titel:
Creatine Supplementation and Upper Limb Strength Performance: A Systematic Review and Meta-Analysis by Lanhers C, Pereira B, […], Dutheil F.

Link:
http://www.ncbi.nlm.nih.gov/pubmed/27328852

Extra informatie van El Mondo:
Lees hier meer over creatine, sportvoeding en krachttraining.

200-1000 mg vitamine C per dag verlaagt de oxidatieve stress

Research Question:
How many mg of vitamin C per day is needed to reduce the increased oxidative stress among athletes?

Study Design:
This overview article contained 12 studies. They were crossover or Rcts. The vitamin C supplementation period ranged from acute to 5 months.

 

Results and conclusions:
Antioxidants supplements are widely used by athletes in order to avoid the increased oxidative stress. The increased oxidative stress leads to muscle damage, a lowered immune system and fatigue.

The researchers conclude that 200-1000 mg of vitamin C per day reduces the oxidative stress while more than 1000 mg per day seems to reduce the training-induced adaptations by decreasing the mitochondrial biogenesis or by any changes of the vascular function.

200 mg of vitamin C per day, obtained by five servings of fruits and vegetables, may be enough to reduce the oxidative stress without the threshold adjustments to exceed the optimal training harms.

During periods of increased oxidative stress athletes can benefit from swallowing more than 200 mg of vitamin C per day for 1 to 2 weeks.

Original title:
Effect of Vitamin C Supplements on Physical Performance by Ballard AJ.

Link:

http://journals.lww.com/acsm-csmr/Fulltext/2012/07000/Effect_of_Vitamin_C_Supplements_on_Physical.8.aspx

Additional information about El Mondo:
Oxidative stress is caused by an imbalance between pro-oxidants and antioxidants. This imbalance can be caused by an increased level of reactive oxygen particles and/or reactive nitrogen particles or a decrease in antioxidant in the immune system. Antioxidants include vitamin C, E, zinc, beta carotene and flavonoids. Pro-oxidants include exhaust fumes, cigarette smoke, particulate matter.