Poster Topical Area: Energy and Macronutrient Metabolism
Location: Hall D
Poster Board Number: 512
BACKGROUND: Adult requirements for daily protein intake rely on nitrogen balance data and are described in terms of total body weight, regardless of body composition. Given the variability in body composition, and that nitrogen balance reflects body cell mass or its clinical proxy, lean body mass (LBM), it may be appropriate to consider LBM when analyzing adult protein needs.
OBJECTIVES: To describe average dietary protein intake in g/kg LBM in a group of healthy adult athletes.
METHODS: Data were obtained from a cross-sectional study in a cohort of healthy masters athletes. Participants' body weight (kg) and height (cm) were measured using a mechanical column scale with attached stadiometer, respectively. Body composition was measured using dual-energy X-ray absorptiometry. Each participant also completed a 2005 Block's Food Frequency Questionnaire. Descriptive statistics were used to determine average energy intake, percent energy from protein and average protein intake in g/kg LBM. An independent samples t-test was used to determine if differences existed in protein intake (g/kg LBM) between women and men. A one-sample t-test was used to compare average protein intake to the Recommended Dietary Allowance (RDA; 0.8 g/kg body weight) for both women and men. Alpha levels were set a priori at p<0.05.
RESULTS: A total of 132 masters athletes (70 women, 62 men; 39±10 years of age; body mass index: 24.6±3.6 kg/m2) were included in our analysis. Average total energy intake was 1,887.4±784.5 kcal/day. Percent energy intake from protein was: 15.5±2.6%. Average protein intake was 1.42±0.54 g/kg LBM for the group. A significant difference was evident between women and men (1.51±0.56 and 1.32±0.50 g/kg LBM, respectively; p=0.043). Women and men had significantly higher protein intakes compared to the RDA (p<0.001).
CONCLUSIONS: We were able to identify the average protein intake (g/kg LBM) for a group of healthy adults. In addition, we identified differences in protein intake (g/kg LBM) between women and men Our findings may contribute to evolving perspectives on how best to determine adult protein requirements.
There are no funding sources, or financial relationships with commercial interests to declare.