Document Type

Thesis - University Access Only

Award Date

2011

Degree Name

Master of Science (MS)

Department / School

Health and Nutritional Sciences

First Advisor

Matthew Vukovich

Abstract

Purpose: The primary purpose of the study was to determine whether increasing protein consumption via an additional 9 ounces of beef per week during an exercise training program designed to encourage high impact loadir.:ig (running and jumping) would affect bone health as measured by markers of bone turnoyer of physically active females exercising 5 days per week for 10 weeks. The hypothesis for this study was that the Beef intervention group would have a positive impact on bone health as measured by markers of bone turnover during the exercise training program compared to a control group of females who maintained their normal diet and followed the same exercise training program. Methods: 42 physically active young women were randomly assigned to the Control (n=17) or Beef (n=25) group. All subjects participated in a high impact load exercise training program designed to promote ground reaction forces, 5 times a week for 10 weeks. Body composition, peak oxygen uptake, 3-day diet record and biochemical markers of bone turnover (BAP, CTx) were measured at baseline and following 10 weeks of exercise training. Exercise consisted of running (45-60min at 70%HRmax) and performing 20 jumps before and after running, which increased by 5 jumps every two weeks. Results: The average consumption of protein in the Beef group was significantly greater compared to the Control group throughout the study (1.3 ±0.07 g/kg; 1.1 ± 0.08 g/kg, respectively). The average consumption of beef was significantly greater in the Beef group than the Control group throughout the course of the study. The intakes of calcium and vitamin D were also significantly greater in the Beef group compared to the Control group for the duration of the study. Total exercise time per session, average heart rate, and maximal oxygen consumption did not differ between groups during the exercise training program. Bone alkaline phosphate increased throughout the duration of the study in the Control and ~eef group (6.8%, 10.6%, respectively, N.S.). There was no difference in carboxy-terminal collagen crosslinks baseline to study completion or between groups. Conclusion: The hypothesis that high beef protein diets would result in improved bone health in young adult women participating in a 10 week exercise training program was not supported in the current study, however, the high beef protein diets did not induce negative bone health.

Publisher

South Dakota State University

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Rights Statement

In Copyright