Table 3.
Phenylalanine and methionine kinetics
| Term | Preterm | |
|---|---|---|
| (n=18) | (n=9) | |
| RA Phenylalanine | ||
| Fast | 72.6 ± 10.8 | - |
| Fed (total) | 73.2 ± 13.3 | 128.9 ± 34.9 |
| Fed (endo) | 52.3 ± 13.3* | 98.7 ± 37.6** |
| Ra Methionine ([1-13C] tracer) | ||
| Fast | 36.2 ± 7.3 | - |
| Fed (total) | 37.0 ± 7.0 | 75.4 ± 24.1 |
| Fed (endo) | 23.4 ± 7.1* | 54.4 ± 25.8** |
| Ra Methionine ([C2H3] tracer) | ||
| Fast | 53.3 ± 12.5 | - |
| Fed (total) | 55.9 ± 14.2 | 100.1 ± 19.31 |
| Fed (endo) | 42.4 ± 14.3* | 76.3 ± 20.4** |
Mean ± SD, µmoles.kg−1.h−1
(endo) = endogenous
*
significantly different than fast, paired t < 0.001
**
significantly different from full term babies, p<0.006