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Bone density as a source of error measuring body composition with the BOD POD and iDXA in female runners

Lombardi, Raymond M.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1325172432

Abstract Details

2012, Master of Science, Ohio State University, Human Ecology: Human Nutrition.
Body composition estimates are used in clinical and research settings. Accurate estimates of percent body fat, lean mass and bone density are desirable to many clients and researchers in health-related fields. Two current methods considered accurate and reliable are the BOD POD and iDXA. Studies comparing the accuracy of these two methods have shown that there is a statistically significant difference of 1-3% in the percent body fat in populations studied, and this difference can be easily attributed to either method. The purpose of this case-control study is to evaluate how bone density may influence the difference for body fat estimates between the BOD POD and the iDXA machines when comparing bone adequate versus osteopenic female runners from a parent study which included 125 recreational female runners. Cases were invited to participate in this BOD POD study based on low bone mineral results (Z score < -1.0 for total body or lumbar spine). Bone adequate controls were at least average or better (Z score > 0). Cases and controls were matched on age (within + 3 years), body size using body height (within + three inches) and weight (within + ten pounds). After each case, an appropriate control (Z-score > 1.0 for total body or lumbar spine) was identified and invited to participate yielding a total of 15 pairs of subjects. Analysis of the percent body fat between the BOD POD and iDXA for each subject was performed by evaluating the calculated difference between the measures, and the data compared between the Case-Control groups. The group variances were determined similar using the Folded F statistic (p = 0.7366). Paired T-test analysis between groups demonstrated no significant difference (p = 0.1102) in the difference variable between the cases (mean 0.68 +1.51) and controls (mean 1.63 +1.66). Power analysis was performed using the mean and standard deviations of the actual sample (1) and indicated a low powered study (1-β = 0.24), and it would have required 77 subjects per group based on these findings to see a significant difference. Conclusion: Based on the findings of this small case-control study, no significant differences were found between the BOD POD and the iDXA measures of percent body fat between the bone insufficient and bone sufficient groups. Further exploration of the data using linear modeling did demonstrate a potential role for bone density and a menstrual indicator when predicting the percent body in the BOD POD from the iDXA estimates. These findings need further investigation using much larger sample.
Jackie Buell, PhD, RD, LD (Advisor)
Joshua Bomser, PhD (Committee Member)
Diane Habash, PhD (Committee Member)
107 p.
Anatomy and Physiology; Biology; Food Science; Health; Health Care; Health Education; Health Sciences; Nutrition; Physical Education; Public Health; Rehabilitation; Sports Medicine
BOD POD; GE Lunar iDXA; iDXA; DXA; body composition; body fat; body measures

Recommended Citations

Citations

  • Lombardi, R. M. (2012). Bone density as a source of error measuring body composition with the BOD POD and iDXA in female runners [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1325172432

    APA Style (7th edition)

  • Lombardi, Raymond. Bone density as a source of error measuring body composition with the BOD POD and iDXA in female runners. 2012. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1325172432.

    MLA Style (8th edition)

  • Lombardi, Raymond. "Bone density as a source of error measuring body composition with the BOD POD and iDXA in female runners." Master's thesis, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1325172432

    Chicago Manual of Style (17th edition)

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This open access ETD is published by The Ohio State University and OhioLINK.