Table 6.

Concentrations (μmol (kg dry wt)⁻¹) of free amino acids in biopsy samples taken from the vastus lateralis muscle of the normal-glycogen leg at rest, immediately after exercise and repeatedly during the recovery period

Amino acid	Rest	After exercise	0.5 h after	1 h after	2 h after
Aspartate	797 ± 84	1873 ± 337*	924 ± 87	801 ± 51	714 ± 41
Glutamate	11980 ± 1020	4290 ± 390*	7700 ± 530*	7910 ± 570*	7720 ± 980*
Serine	1700 ± 213	1856 ± 143	1918 ± 166	1661 ± 170	1547 ± 146
Glutamine	47700 ± 3530	49130 ± 4330	49030 ± 6320	50 700 ± 5520	51410 ± 5410
Histidine	1334 ± 126	1405 ± 88	1451 ± 151	1381 ± 118	1426 ± 117
Glycine	3415 ± 349	2989 ± 145	3473 ± 256	3120 ± 233	2960 ± 222
Threonine	1764 ± 175	1861 ± 136	1940 ± 142	1649 ± 134	1555 ± 121
Alanine	5190 ± 440	7870 ± 800*	6150 ± 960	4430 ± 660	4420 ± 430
Taurine	50910 ± 6340	51950 ± 3690	57640 ± 5150	51790 ± 4570	47790 ± 3140
Arginine	905 ± 146	1051 ± 120	1013 ± 208	1005 ± 158	905 ± 123
Tyrosine	212 ± 8	259 ± 15*	259 ± 19*	210 ± 15	207 ± 23
Methionine	115 ± 12	132 ± 6	135 ± 10	100 ± 6	95 ± 7
Valine	896 ± 56	928 ± 59	937 ± 46	809 ± 59	895 ± 84
Phenylalanine	206 ± 12	297 ± 37*	263 ± 22*	204 ± 14	219 ± 25
Isoleucine	287 ± 21	303 ± 18	324 ± 19	278 ± 19	328 ± 35
Leucine	607 ± 52	603 ± 37	653 ± 44	542 ± 43	656 ± 85
Lysine	1643 ± 151	1944 ± 98	1855 ± 241	1799 ± 181	1648 ± 158

The subjects performed cycle exercise for 1 h with a reduced muscle glycogen content in one leg. The values given are means ± S.E.M. for eight subjects.

^*P < 0.05 as compared with rest.