Navigation Links
Iron, vitamins could affect physical fitness in adolescents

Bethesda, Md. (Aug. 8, 2012)Adolescence is an important time not only for growing but for acquiring healthy habits that will last a lifetime, such as choosing foods rich in vitamins and minerals, and adopting a regular exercise regimen. Unfortunately, several studies have shown that adolescents' intake of important nutrients, as well as their performance on standard physical fitness tests, has fallen in recent years. Because nutrition and fitness are intertwinedfor example, iron forms part of hemoglobin, which carries oxygen to muscles, and antioxidants such as vitamin C aid in rebuilding damage after intense trainingthese two findings could be related. In a new study, researchers have found that adolescents' blood levels of various micronutrients are correlated with how well they performed in certain physical fitness tests. Though these results don't prove causality, they suggest a new relationship between different measures of adolescent health.

The article is entitled "Iron and Vitamin Status Biomarkers and its Association with Physical Fitness in Adolescents. The HELENA Study." and is online at It appears in the online edition of the Journal of Applied Physiology, a publication of the American Physiological Society.


Researcher Luis Gracia-Marco of the University of Zaragoza, Spain and his colleagues relied on data from a larger, long-term research project known as the Healthy Lifestyle in Europe by Nutrition in Adolescents Cross-Sectional Study, or HELENA-CSS. Part of this study, which involved thousands of volunteers between the ages of 12.5 and 17.5 in cities scattered across Europe, gathered nutrition and physical fitness data. Blood samples taken in one third of the volunteers (n=1089) were tested for a variety of micronutrients, including hemoglobin, indicative of iron intake, soluble transferrin receptor, serum ferritin, retinol, 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).


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 study specifically designed to evaluate causal relationships," the authors write.


Contact: Donna Krupa
American Physiological Society

Related biology news :

1. New model synapse could shed light on disorders such as epilepsy and anxiety
2. Wrinkled surfaces could have widespread applications
3. Lower vitamin D could increase risk of dying, especially for frail, older adults
4. Active forest management to reduce fire could help protect northern spotted owl
5. Diets high in salt could deplete calcium in the body: UAlberta research
6. New species of ancient rodents hint at what could be worlds oldest grasslands
7. Reorganizing brain could lead to new stroke, tinnitus treatments
8. Millions of diabetics could die of tuberculosis
9. Researchers discover molecule in immune system that could help treat dangerous skin cancer
10. Patient-derived stem cells could improve drug research for Parkinsons
11. Programmable RNA complex could speed genome editing in the lab
Post Your Comments:
(Date:11/12/2015)... , Nov. 11, 2015   Growing need ... analytical tools has been paving the way for ... determination of discrete analytes in clinical, agricultural, environmental, ... being predominantly used in medical applications, however, their ... sectors due to continuous emphasis on improving product ...
(Date:11/10/2015)... 2015 About signature verification ... to identify and verify the identity of an ... the secure and accurate method of authentication and ... individual because each individual,s signature is highly unique. ... dynamic signature of an individual is compared and ...
(Date:11/4/2015)... 4, 2015 --> ... published by Transparency Market Research "Home Security Solutions Market - ... 2015 - 2022", the global home security solutions market is expected ... 2022. The market is estimated to expand at a ... to 2022. Rising security needs among customers at homes, ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... ... November 25, 2015 , ... ... were featured on AngelList early in their initial angel funding process. Now, they ... for individuals looking to make early stage investments in the microbiome space. ...
(Date:11/24/2015)... Nov. 24, 2015 Halozyme Therapeutics, Inc. (NASDAQ: HALO ... New York on Wednesday, December 2 at ... , president and CEO, will provide a corporate overview. ... at 1:00 p.m. ET/10:00 a.m. PT . ... will provide a corporate overview. --> th Annual ...
(Date:11/24/2015)... /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ:  AEZS) (TSX: AEZ) (the ... the Toronto Stock Exchange, confirms that as of the ... developments that would cause the recent movements in the ... --> About Aeterna Zentaris Inc. ... Aeterna Zentaris is a specialty biopharmaceutical company engaged in ...
(Date:11/24/2015)... IN (PRWEB) , ... November 24, 2015 , ... The ... newest Special Interest Group (SIG), MultiGP, also known as Multirotor Grand Prix, to represent ... the last few years. Many AMA members have embraced this type of racing and ...
Breaking Biology Technology: