(1987) Amino acids, brain neurotransmitters and a
functional link between muscle and brain that is
important in sustained exercise. In Advances in
Myochemistry(ed. G. Benzi), pp. 127–133. John
Libbey Eurotext, London.
Olds, M.E. & Fobes, J.L. (1981) The central basis of moti-
vation: intracranial self-stimulation studies. Annual
Reviews of Psychology 32 , 23–74.
Owasoyo, J.O., Neri, D. & Lamberth, J.G. (1992)
Tyrosine and its potential use as a contermeasure to
performance decrement in military sustained opera-
tions.Aviation and Space Environmental Medicine 63 ,
364–369.
Samii, A., Wasserman, E.M., Ikoma, K., Mercuri, B. &
Hallett, M. (1996) Characterization of postexercise
facilitation and depression of motor evoked poten-
tials to transcranial magnetic stimulation. Neurology
46 , 1376–1382.
Sandage, B.W., Sabounjian, L., White, R. & Wurtman,
R.J. (1992) Choline citrate may enhance athletic per-
formance.Physiologist 35 , 236.
Schwarzberg, H. & Roth, N. (1989) Increased locomotor
activity of rats by self-stimulation in a running
wheel.Physiological Behavior 46 , 767–769.
Shukitt-Hale, B., Stillman, M.J. & Leiberman, H.R.
(1996) Tyrosine administration prevents hypoxia-
induced decrements in learning and memory.
Physiological Behavior 59 , 867–871.
Soubrie, P., Reisine, T.D. & Glowinski, J. (1984) Func-
tional aspects of serotonin transmission in the
basal ganglia: a review and an in vivo approach
using push-pull cannula technique. Neuroscience 13 ,
605–625.
Spector, S.A., Jackman, M.R., Sabounjian, L.A., Sakkas,
C., Landers, D.M. & Willis, W.T. (1995) Effect of
choline supplementation on fatigue in trained
cyclists.Medicine and Science in Sports and Exercise 27 ,
668–673.
Taylor, J.L., Butler, J.E., Allen, G.M. & Gandevia, S.
(1996) Changes in motor cortical excitability during
human muscle fatigue. Journal of Applied Physiology
490 , 519–528.
van Hall, G., Raaymakers, J.S.H., Saris, W.H.M. &
Wagenmakers, A.J.M. (1995) Ingestion of branched-
chain amino acids and tryptophan during sustained
exercise-failure to affect performance. Journal of
Applied Physiology 486 , 789–794.
Varnier, M., Sarto, P. & Martines, D. (1994) Effect of
infusing branched-chain amino acid during
incremental exercise with reduced muscle glycogen
content.European Journal of Applied Physiology 69 ,
26–31.
Verger, P.H., Aymard, P., Cynobert, L., Anton, G. &
Luigi, R. (1994) Effects of administration of
branched-chain amino acids vs. glucose during acute
exercise in the rat. Physiological Behavior 55 , 523–526.
Wagenmakers, A.J.M., Coakley, J.H. & Edwards, R.H.T.
(1990) Metabolism of branched-chain amino acids
and ammonia during exercise: clues from McArdle’s
disease.International Journal of Sports Medicine 11 ,
S101–S113.
Welsh, R.S., Waskovich, M., Alderson, N.L. & Davis,
J.M. (1997) Carbohydrate and branched-chain amino
acid feedings suppress brain 5-HT during prolonged
exercise. Medicine and Science in Sports and Exercise 29 ,
S192.
Wilson, W.M. & Maughan, R.J. (1992) Evidence for a
possible role of 5-hydroxytryptamine in the genesis
of fatigue in man: administration of paroxetine, a
5-HT re-uptake inhibitor, reduces the capacity to
perform prolonged exercise. Experimental Physiology
77 , 921–924.