Title page for ETD etd-06222012-175202


Type of Document Master's Thesis
Author Forney, Laura
Author's Email Address lforne2@tigers.lsu.edu
URN etd-06222012-175202
Title Vitamin D Status, Adiposity, and Athletic Performance Measures in College-Aged Students
Degree Master of Science (M.S.)
Department Kinesiology
Advisory Committee
Advisor Name Title
Stewart, Laura Committee Chair
Nelson, Arnold Committee Member
Tuuri, Georgianna Committee Member
Keywords
  • body fat
  • 25-hydroxyvitamin D
  • aerobic fitness
Date of Defense 2012-06-11
Availability unrestricted
Abstract
Research suggests that elevated serum concentrations of 25-hydroxyvitamin D (25OHD) are associated with slowing the development of many age-related chronic diseases. Recent reports also show a positive relationship between 25OHD and muscle synthesis, strength, power and decreased body fat in elderly individuals. However, these findings have not been consistently reported in younger, healthy populations. PURPOSE: To investigate the relationship between 25OHD levels, body composition, measures of aerobic fitness and muscular strength and power in a young, physically active population. METHODS: Thirty-nine active subjects (20 males, 19 females; 23 0.7 years old) reported to the lab six times for testing. Blood was drawn and 25OHD concentrations were determined using an enzyme-linked immunosorbent assay (ELISA). Primary outcomes included: body composition (dual-energy x-ray absorptiometry, DXA); resting metabolic rate; maximal oxygen uptake (VO2max); power output (Wingate); and strength (eight repetition maximum of bench press, upright row and leg extension and flexion). Primary analysis included all participants, and sub-group analyses on those individuals considered to have sub-optimal serum 25OHD (< 35 ng/mL); LOW (n = 20, 25.97 1.97 ng/mL) and adequate levels of 25OHD (< 35 ng/mL) HIGH (n =19, 44.15 2.17 ng/mL). RESULTS: Half of the subjects (n = 20) exhibited less than optimal 25OHD status, due in part to lack of dietary intake. HIGH males had significantly higher VO2max values when compared to LOW males (p < 0.01). CONCLUSION: A high percentage of college-aged male and female individuals may not be consuming enough vitamin D and aerobic fitness may also be linked to vitamin D status.
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