Dose-Dependent Effects of Oral Tyrosine Administration on Plasma Tyrosine Levels and Cognition in Aging

Overview

Journal Nutrients

Date 2017 Nov 24

PMID 29168741

Citations 16

Authors

Ondine van de Rest

Mirjam Bloemendaal

Rianne de Heus

Esther Aarts

Affiliations

Soon will be listed here.

Abstract

The effects of tyrosine on plasma response and cognition in aging are unknown. We assessed the dose-dependent response to tyrosine administration in older adults in both plasma tyrosine concentrations and working memory performance. In this double blind randomized cross-over trial 17 older adults (aged 60-75 years) received a single administration of 100, 150, or 200 mg/kg body weight of tyrosine. For comparison, 17 young adults (aged 18-35 years) received a dose of 150 mg/kg body weight of tyrosine. Tyrosine plasma concentrations were determined before and 90, 120, 150, 180, 210, and 240 min after tyrosine intake. Working memory was assessed using the N-back task at 90 min after tyrosine administration. Older adults showed a dose-dependent increase in plasma tyrosine concentrations ( < 0.001), and the plasma response was higher than for young adults with the same dose ( < 0.001). Load-dependent working memory performance decreased with higher doses of tyrosine ( = 0.048), especially in older adults with greater dose-dependent plasma tyrosine responses ( = 0.035). Our results show an age-related increase in plasma tyrosine response, which was associated with a dose-dependent decline in cognitive functioning in older adults.

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