Table 1.

General characteristics

Parameters	Body Weight, kg	Rectal Temperature, °C	Heart Rate, beats/min	MAP, mmHg	Unlabeled Phe, mg/kg	Phe Tracer, mg/kg	Thr Tracer, mg/kg
Baseline	4.56 ± 0.04	37.9 ± 0.2	150 ± 7	72 ± 1
Study 1		37.9 ± 0.1	148 ± 1	68 ± 1	30	6	20
Study 2		38.0 ± 0.2	157 ± 2	56 ± 1*	50	8.3	20

Values are means ± SE.

MAP, mean arterial blood pressure; Phe, phenylalanine; Thr, threonine.

Data for rectal temperature, heart rate, and MAP are averages of 3 measurements during the experiments. Unlabeled Phe, Phe tracer, and Thr tracer are the concentrations of unlabeled Phe, Phe, and Thr tracers, respectively (mg/kg), injected during the study periods.