Tyrosine supplementation mitigates working memory decrements during cold exposure

@article{Mahoney2007TyrosineSM,
  title={Tyrosine supplementation mitigates working memory decrements during cold exposure},
  author={Caroline R. Mahoney and John W. Castellani and F. Matthew Kramer and Andrew J. Young and Harris R. Lieberman},
  journal={Physiology \& Behavior},
  year={2007},
  volume={92},
  pages={575-582}
}
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Tyrosine Supplementation Attenuates Cognitive and Psychomotor Deficits in Cold Environments
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In rats, dietary supplementation with the amino acid tyrosine (TYR) prevented depletion of central catecholamines observed during acute environmental stress and might have similar effects on cognitive, psychomotor, and physical performance in humans exposed to environmental stress.
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It may be concluded that tyrosine supplementation improves heat stress-induced decrement in attention by maintaining the synthesis and turnover of norepinephrine.
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TLDR
Ingestion of a TYR solution did not influence time to exhaustion or several aspects of cognitive function when exercise was undertaken in a warm environment.
Tyrosine Ingestion and Its Effects on Cognitive and Physical Performance in the Heat.
PURPOSE Ingestion of tyrosine (TYR), a catecholamine precursor, has previously improved aspects of cognitive function and mood during acute stress, although there is limited research exploring the…
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Ingesting the catecholamine precursor tyrosine can prevent decrements in, or improve, cognitive and motor performance in demanding situations. Furthermore, the biopsychosocial model of challenge and…
Oral tyrosine supplementation improves exercise capacity in the heat
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It is suggested for the first time that the availability of tyrosine, a nutritional dopamine precursor, can influence the ability to subjectively tolerate prolonged submaximal constant-load exercise in the heat.
Tyrosine negatively affects flexible-like behaviour under cognitively demanding conditions.
Oral L-Tyrosine Supplementation Improves Core Temperature Maintenance in Older Adults.
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Results indicate that L-tyrosine supplementation improves Tc maintenance in response to acute cold exposure in an older population.
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References

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TLDR
Exposure of 18 lean, lightly-clothed women, who were users of oral contraceptives, to cold air to create a stressful situation for evaluating the effects of supplemental tyrosine upon subjective reactions and mental performance, revealed no changes in symptomatology, moods, and cognitive performances.
Tyrosine improves behavioral and neurochemical deficits caused by cold exposure
l-Tyrosine ameliorates some effects of lower body negative pressure stress
Tyrosine ameliorates a cold-induced delayed matching-to-sample performance decrement in rats
TLDR
It appears that supplemental tyrosine was effective in partially ameliorating the effects of cold stress on DMTS performance, possibly by preventing a cold-stress-induced reduction in brain catecholamine levels.
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TLDR
Tyrosine administration was associated with a significant amelioration of the usual performance decline on a psychomotor task and a significant reduction in lapse probability on a high-event-rate vigilance task, suggesting that tyrosine is a relatively benign treatment at this dose.
Treatment with tyrosine, a neurotransmitter precursor, reduces environmental stress in humans
Behavioral and neurochemical effects of dietary tyrosine in young and aged mice following cold-swim stress
Tyrosine prevents behavioral and neurochemical correlates of an acute stress in rats.
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