Table II.

Plasma concentration of amino acids (mean±SEM).

	Young (n=26)	Middle (n=26)	Old (n=26)	p.value*	Normal Range
Asp	17.74±1.55a	12.60±1.22b	12.87±1.39bc	0.017	2–25
Glu	230.07±27.11	257.90±29.55	230.54±19.13	0.681	26–240
Asn	64.96±6.11a	74.29±7.15ab	105.12±14.08bc	0.012	20–80
Ser	144.16±13.02	109.05±12.56	133.48±12.36	0.538	80–230
His	74.24±6.48	75.56±8.31	81.70±8.02	0.764	54–120
Gly	163.21±11.32a	170.27±13.18ab	238.88±12.52c	<0.001	135–350
Thr	106.52±8.47a	101.35±9.03ab	82.09±8.10c	0.001	60–205
Cit	27.19±1.58a	26.23±2.26ab	32.53±1.94c	0.054	10–45
Arg	42.24±5.37	43.03±5.49	43.61±3.57	0.981	12–40
Ala	287.51±24.19	294.25±25.22	336.38±27.50	0.350	123–310
Tyr	62.80±7.37	59.30±5.51	53.39±4.72	0.534	32–85
Met	13.63±1.79	15.04±2.79	16.75±2.41	0.650	28–110
Val	151.41±13.48a	142.33±14.76ab	106.64±10.79c	0.043	60–190
Phe	33.75±3.31a	32.400±3.41ab	43.50±3.60c	0.051	32–85
Ileu	47.84±4.06a	43.98±3.92ab	33.13±3.55bc	0.024	28–110
Leu	79.52±6.64a	72.87±6.96a	52.49±6.18bc	0.013	60–190
Orn	76.42±6.85	78.93±8.10	93.19±7.65	0.244	28–110
Lys	104.64±8.00a	104.36±10.50ab	143.90±11.84c	0.009	80–240

*Based on Post Hoc, Tukey Test unit : μmol/L