Table 3.

Phenylalanine concentrations, leg blood flow, and phenylalanine net balance

		Time Postingestion
	Rest	1–2.5 h (Early)	2.5–4 h (Late)	1–2 h	2–3 h	3–4 h	1–4 h (Entire)
Femoral arterial blood phenylalanine concentration, nmol/ml
Blend	57.2 ± 1.3	70.8 ± 2.0a,c	60.0 ± 2.7	74.4 ± 2.4a,d,e	63.8 ± 2.6a,f	58.5 ± 3.0	65.6 ± 1.9a
Whey	59.0 ± 2.6	64.0 ± 3.0a,c	56.6 ± 2.9	68.1 ± 3.0a,d,e	57.5 ± 2.8	56.0 ± 3.1	60.6 ± 2.9
Femoral venous blood phenylalanine concentration, nmol/ml
Blend	62.6 ± 1.7	71.2 ± 1.8a,c	63.0 ± 2.0	72.7 ± 2.2a,d,e	67.2 ± 1.8a,f	61.3 ± 2.4	67.1 ± 1.3a
Whey	63.0 ± 2.5	66.3 ± 3.1a,c	60.0 ± 2.7	70.0 ± 3.3a,d,e	60.8 ± 2.9	59.0 ± 2.7	63.6 ± 2.9
Leg blood flow, ml·min−1·100 g leg muscle−1
Blend	2.41 ± 0.22	3.47 ± 0.98	3.23 ± 0.49	3.57 ± 1.23	3.26 ± 0.59	3.27 ± 0.46	3.37 ± 0.73
Whey	2.66 ± 0.41	3.23 ± 0.52	3.79 ± 0.55	3.11 ± 0.45	3.65 ± 0.64	3.75 ± 0.57	3.50 ± 0.53
Phenylalanine net balance, nmol·min−1·100 g lean leg mass−1
Blend	−12.3 ± 1.5	2.3 ± 4.1a,c	−8.0 ± 2.4	9.3 ± 5.7a,d,e	−8.6 ± 3.7	−8.1 ± 2.4	−2.3 ± 2.7a
Whey	−10.5 ± 1.8	−6.5 ± 2.8	−12.0 ± 4.3	−3.5 ± 4.4	−12.7 ± 4.5	−11.7 ± 4.5	−9.1 ± 2.8
		2 h	4 h
Intracellular muscle phenylalanine concentration, nmol/ml
Blend	68.7 ± 2.8	77.0 ± 4.9	61.5 ± 3.0b				69.3 ± 3.2
Whey	70.5 ± 5.7	74.6 ± 9.7	60.4 ± 4.7b				67.5 ± 6.3

Values are means ± SE. Femoral artery and vein blood and intracellular muscle phenylalanine concentration, leg blood flow, and phenylalanine net balance across the leg at rest and postingestion for subjects given Whey (n = 8) and a Blend (n = 8) at 1 h postexercise are shown. Comparisons are as follows: Rest vs. Early, Late, Entire, 2 h, 3 h, and 4 h; Early vs. Late; and 2 h vs. 3 h vs. 4 h.

^aP < 0.05 vs. Rest.

^bP < 0.05, main effect of time.

^cP < 0.05, Early vs. Late.

^dP < 0.05, 2 h vs. 3 h.

^eP < 0.05, 2 h vs. 4 h.

^fP < 0.05, 3 h vs. 4 h.