Total body potassium differs by sex and race across the adult age span
Open Access
- 1 July 2003
- journal article
- research article
- Published by Elsevier BV in The American Journal of Clinical Nutrition
- Vol. 78 (1), 72-77
- https://doi.org/10.1093/ajcn/78.1.72
Abstract
Background: Total body potassium (TBK) is an index of fat-free mass. Data describing changes in TBK in African American, Asian, or Hispanic populations have not been reported. Objective: The aim was to investigate possible sex and racial differences in TBK in adults over an age range of 70 y. Design: The study used longitudinal and cross-sectional data collected in a body-composition unit from 973 men and 1368 women of African American, Asian, white, and Hispanic race-ethnicity. Random coefficient models in which baseline weight and height were taken into account were applied to estimate sex-specific changes in TBK among the 4 racial-ethnic groups. Results: The ages of 30 and 31 y were identified for women and men, respectively, as the cutoffs after which TBK began to decline. Both sexes had similar racial-ethnic patterns for expected mean TBK at the age cutoffs: African Americans had the highest value, followed by whites, Hispanics, and Asians. After the age cutoffs, the decline in TBK differed by race and sex. In women, African Americans showed the most rapid decline, whereas Asians had the lowest. In men, Hispanics had the most rapid decline in TBK, followed by African Americans, whites, and Asians. Conclusion: Significant sex and racial differences exist in the rate of change in TBK with age. Further studies are needed to explore the associations of declining TBK with health risks.Keywords
This publication has 24 references indexed in Scilit:
- Stalking SarcopeniaAnnals of Internal Medicine, 1995
- Differences Between Young and Old Females in the Five Levels of Body Composition and Their Relevance to the Two-compartment Chemical ModelJournal of Gerontology, 1994
- Aging in humans: a continuous 20-year study of physiologic and dietary parameters.Journal of the American College of Nutrition, 1992
- Forensic anthropology and the concept of race: If races don't exist, why are forensic anthropologists so good at identifying them?Social Science & Medicine, 1992
- Reference man and woman more fully characterizedBiological Trace Element Research, 1990
- Body composition. Prediction of normal body potassium, body water and body fat in adults on the basis of body height, body weight and ageScandinavian Journal of Clinical and Laboratory Investigation, 1980
- Robust Locally Weighted Regression and Smoothing ScatterplotsJournal of the American Statistical Association, 1979
- Changes in body chemical composition with age measured by total-body neutron activationMetabolism, 1976
- Aging, Total Body Potassium, Fat-free Mass, and Cell Mass in Males and Females Between Ages 18 and 85 YearsJournal of Gerontology, 1972
- Adult lean body mass declines with age: Some longitudinal observationsMetabolism, 1970