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Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
The relationship between total body potassium and resting energy expenditure in individuals with paraplegia.
Archives of Physical Medicine and Rehabilitation 1993 September
Body composition changes occur with spinal cord injury (SCI): fat-free mass (FFM) decreases and fat mass (FM) increases. FFM has been reported to correlate with resting energy expenditure (REE) in non-SCI individuals. This report addresses the question as to whether REE correlates with measures of FFM in individuals with paraplegia. Twelve males with chronic paraplegia had measurements of total body potassium (TBK), an indicator of lean tissue, by whole body 40K counting, and FFM by dual photon x-ray absorptiometry (FFMDPX). REE was measured using a metabolic cart for exhaled gas analysis. Corrleations between REE and TBK, and REE and FFMDPX were determined. The mean TBK for the group was 2,850 +/- 190 mEq. In all subjects, TBK was below that of expected (predicted from age, height, and weight). For the group this was 34 +/- 0.04% below predicted. The mean FFMDPX was 58.3 +/- 3.3 kg. Following an overnight fast, REE was measured for each subject while in a seated position. The mean REE was 1,855 +/- 70 kcal/day. REE correlates well with both TBK (r = 0.86, p < 0.0005) and FFMDPX (r = 0.80, p < 0.005). In summary, despite losses in metabolically active tissue in individuals with chronic paraplegia, TBK and FFMDPX continue to have a strong relationship with REE. REE (kcal/d) may be used as an indicator of TBK or FFMDPX using the following linear regression equations: TBK (mEq) = 2.28.REE (kcal/d) - 1,377 (SEE = +/- 347) or FFMDPX (kg) = 0.038.REE (kcal/d) - 11.5 (SEE = +/- 7).(ABSTRACT TRUNCATED AT 250 WORDS)
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