Is for deficiency
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is for deficiency . An Overview of Vitamin D Deficiency in Athletes . Caitlin Hendler. Vitamin D Basics . Recommended Dietary Allowances (RDAs) for Vitamin D. Fat-soluble Sources Very few foods (fortified) Sunlight Supplements . Office of Dietary Supplements - NIH.

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Is for deficiency

is for deficiency

An Overview of Vitamin D Deficiency in Athletes

Caitlin Hendler


Vitamin d basics

Vitamin D Basics

Recommended Dietary Allowances (RDAs) for Vitamin D

  • Fat-soluble

  • Sources

    • Very few foods (fortified)

    • Sunlight

    • Supplements

Office of Dietary Supplements - NIH

Salmon - 447 IU’s

Swordfish - 566 IU’s

Milk – 115-124 IU’s


Vitamin d function

Vitamin D Function


Vitamin d deficiency

Vitamin D Deficiency

  • Defined as 25-hyroxyvitamin D level of less than 20 ng/mL

  • Can occur when…

    • usual intake is lower than recommended levels over time, exposure to sunlight is limited

    • the kidneys cannot convert 25(OH)D to its active form

    • absorption of vitamin D from the digestive tract is inadequate


Vitamin d deficiency history

Vitamin D Deficiency History

  • Rickets was first recognized by British researchers in the mid-17th century

  • In the late 19th and early 20th centuries, German physicians noted consuming 1-3 teaspoons per day of cod liver oil could reverse rickets

  • Fortification of milk with vitamin D began in the 1930’s


Vitamin d deficiency prevalence

Vitamin D Deficiency Prevalence

  • Estimates suggest that up to 1 billion people around the world have vitamin D deficiency or insufficiency

  • According to the National Health and Nutrition Examination Survey 2005-2006 (n=4495) 41.6% was vitamin D deficient (2)


Vitamin d deficiency athletes

Vitamin D Deficiency & Athletes

  • Evidence suggests that vitamin D plays an important role in an athletes health, training and performance

  • Most probable reason for poor vitamin D status is inadequate endogenous synthesis from insufficient UVB exposure

    • Skin pigmentation

    • Early-or-late day training

    • Indoor training

    • Geographic location

    • Sunscreen use


Importance of vitamin d in athletes

Importance of Vitamin D in Athletes

  • Bone health

  • Muscle pain

  • Muscle performance

    • Type 2 muscle fibers

  • Inflammation and immunity


Vitamin d requirements for athletes

Vitamin D Requirements for Athletes

  • Many researchers have suggested that the recommended daily allowance (RDA) may need to be changed to 800-2200 IU and possibly higher depending on the stage of life

  • The tolerable upper limit (TUL) currently set at 2000 IU is also in need of revision


References

References

Cannell JJ, Hollis BW, Sorenson TB, Taft TN, Anerson JJ. Athletic Performance and vitamin D. Med. Sci. Sports Exrc. 2009; 41:1102-10.

Forrest, K.Y.Z and Stuhldreher, W.L. Prevalence and correlates of vitamin D deficiency. Nutrition Research, 31, pp.48-54, 2011.

Larson-Meyer, DE & Willis KS. Vitamin D and athletes. Curr. Sports Med. Rep., Vol. 9, No. 4, pp.220-226, 2010.

Ward KA, Das G, Berry JL, et al. Vitamin D status and muscle function in post-menarchal adolescent girls. J. Clin. Endocrinol. Metab. 2009; 94:559-63.


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