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Iron, vitamins could affect physical fitness in adolescents
Date:8/8/2012

tinol, vitamin C, beta-carotene, alpha-tocopherol, vitamin B6, cobalamin, holo-transcobalamin, plasma folate, RCB folate and vitamin D. The volunteers' physical fitness was also assessed through a standing long jump test, which assesses lower-body muscular strength, and a 20 meter shuttle run test, which assesses cardiovascular fitness through maximal oxygen consumption (VO2max). When looking for correlations between the micronutrient levels and physical fitness, they took into account the adolescents' age, time of year, latitude of the city they lived in, body mass index, age of menarche in females, and amount of regular physical activity (using accelerometers).

Results

The researchers found that blood levels of certain micronutrients were intimately connected with the volunteers' performance on the physical fitness tests. For cardiorespiratory fitness, concentrations of hemoglobin, retinol, and vitamin C in males and beta-carotene and vitamin D in females was associated with VO2max. For muscular fitness, concentrations of hemoglobin, beta-carotene, retinol, and alpha-tocopherol in males and beta-carotene and vitamin D in females was associated with performing better on the standing long jump test.

Importance of the Findings

The authors suggest that studies connecting micronutrients, such as the ones they measured, with physical fitness in any population has been controversial and limited. This is especially true for adolescents, a group that's often difficult to gather information on. This new study, they say, is one of the first to find connections between micronutrients and physical fitness in this age group, with the strength of controlling the results for a complete set of relevant confounders. Yet, they note that more research still needs to be done.

"The associations between physical fitness and iron or vitamin status observed in this cross-sectional study in adolescents should be followed up by a st
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Contact: Donna Krupa
dkrupa@the-aps.org
American Physiological Society
Source:Eurekalert

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