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Am J Physiol Endocrinol Metab (October 15, 2002). doi:10.1152/ajpendo.0199.2001
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Articles in PresS, published online ahead of print October 15, 2002
Am J Physiol Endocrinol Metab, 10.1152/ajpendo.0199.2001
Submitted on May 9, 2001
Accepted on October 6, 2002

Potassium per kg fat-free mass and total body K: predictions from gender, age and anthropometry

Ingrid Larsson1, Anna Karin Lindroos1, Markku Peltonen1, and Lars Sjostrom1*

1 Department of Body Composition and Metabolism, The Sahlgrenska Academy at Goteborg University, Goteborg, Sweden

* To whom correspondence should be addressed. E-mail: lars.sjostrom{at}medfak.gu.se.

Total body potassium (TBK) is mainly located intracellularly and constitutes an index of fat-free mass (FFM). The aim was to examine if TBK and TBK/FFM -ratio can be estimated from gender, age, weight and height. A primary study group (164 males, 205 females) and a validation group (161, 206), aged 37-61 years, were randomly selected from the general population. TBK was determined by whole-body counting and FFM was obtained by DXA (dual-energy x-ray absorptiometry). The primary study group was used to construct gender-specific equations predicting TBK and TBK/FFM from age, weight and height. The equations were used to estimate TBK and TBK/FFM in the validation group. The estimates were compared with measured values. TBK in different age ranges was predicted with errors ranging from 5.0 to 6.8%, errors for TBK/FFM ranged from 2.7 to 4.8%, respectively. By adding FFMDXA as a fourth predictor, the error of the TBK prediction decreased approximately with 2 percent units. In conclusion, TBK and TBK/FFM can be meaningfully estimated from gender, age, weight and height.






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