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The effects of black tea and other beverages on aspects of cognition and psychomotor performance.
Psychopharmacology (Berl) 1998; 139(3):230-8P

Abstract

Nineteen healthy volunteers ingested 400 ml black tea, coffee, caffeinated water, decaffeinated tea or plain water on three occasions through the day (0900, 1400 and 1900 hours). A 2 x 2 factorial design with caffeine (0, 100 mg) and beverage type (water, tea) was employed, with coffee (100 mg caffeine) as a positive internal control, based on a five-way crossover. A psychometric test battery comprising critical flicker fusion (CFF), choice reaction time (CRT), short-term memory (STM) and subjective sedation (LARS) was performed at regular intervals throughout the day, and intensively so immediately following each beverage. Consumption of tea compared to water was associated with transient improvements in performance (CFF) within 10 min of ingestion and was not affected by the time of day. Caffeine ingestion was associated with a rapid (10 min) and persistent reduction in subjective sedation values (LARS), again independent of time of day, but did not acutely alter CFF threshold. Over the whole day, consumption of tea rather than water, and of caffeinated compared to decaffeinated beverages, largely prevented the steady decline in alertness (LARS) and cognitive capacity observed with water ingestion. The effects of tea and coffee were similar on all measures, except that tea consumption was associated with less variation in CFF over the whole day. No significant treatment effects were apparent in the data for the STM. Tea ingestion is associated with rapid increases in alertness and information processing capacity and tea drinking throughout the day largely prevents the diurnal pattern of performance decrements found with the placebo (no caffeine) condition. It appears that the effects of tea and coffee were not entirely due to caffeine per se; other factors either intrinsic to the beverage (e.g. sensory attributes or the presence of other biologically active substances) or of a psychological nature (e.g. expectancy) are likely to play a significant role in mediating the responses observed in this study.

Authors+Show Affiliations

HPRU, University of Surrey, Milford Hospital, Godalming, UK.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

9784078

Citation

Hindmarch, I, et al. "The Effects of Black Tea and Other Beverages On Aspects of Cognition and Psychomotor Performance." Psychopharmacology, vol. 139, no. 3, 1998, pp. 230-8.
Hindmarch I, Quinlan PT, Moore KL, et al. The effects of black tea and other beverages on aspects of cognition and psychomotor performance. Psychopharmacology (Berl). 1998;139(3):230-8.
Hindmarch, I., Quinlan, P. T., Moore, K. L., & Parkin, C. (1998). The effects of black tea and other beverages on aspects of cognition and psychomotor performance. Psychopharmacology, 139(3), pp. 230-8.
Hindmarch I, et al. The Effects of Black Tea and Other Beverages On Aspects of Cognition and Psychomotor Performance. Psychopharmacology (Berl). 1998;139(3):230-8. PubMed PMID: 9784078.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effects of black tea and other beverages on aspects of cognition and psychomotor performance. AU - Hindmarch,I, AU - Quinlan,P T, AU - Moore,K L, AU - Parkin,C, PY - 1998/10/23/pubmed PY - 1998/10/23/medline PY - 1998/10/23/entrez SP - 230 EP - 8 JF - Psychopharmacology JO - Psychopharmacology (Berl.) VL - 139 IS - 3 N2 - Nineteen healthy volunteers ingested 400 ml black tea, coffee, caffeinated water, decaffeinated tea or plain water on three occasions through the day (0900, 1400 and 1900 hours). A 2 x 2 factorial design with caffeine (0, 100 mg) and beverage type (water, tea) was employed, with coffee (100 mg caffeine) as a positive internal control, based on a five-way crossover. A psychometric test battery comprising critical flicker fusion (CFF), choice reaction time (CRT), short-term memory (STM) and subjective sedation (LARS) was performed at regular intervals throughout the day, and intensively so immediately following each beverage. Consumption of tea compared to water was associated with transient improvements in performance (CFF) within 10 min of ingestion and was not affected by the time of day. Caffeine ingestion was associated with a rapid (10 min) and persistent reduction in subjective sedation values (LARS), again independent of time of day, but did not acutely alter CFF threshold. Over the whole day, consumption of tea rather than water, and of caffeinated compared to decaffeinated beverages, largely prevented the steady decline in alertness (LARS) and cognitive capacity observed with water ingestion. The effects of tea and coffee were similar on all measures, except that tea consumption was associated with less variation in CFF over the whole day. No significant treatment effects were apparent in the data for the STM. Tea ingestion is associated with rapid increases in alertness and information processing capacity and tea drinking throughout the day largely prevents the diurnal pattern of performance decrements found with the placebo (no caffeine) condition. It appears that the effects of tea and coffee were not entirely due to caffeine per se; other factors either intrinsic to the beverage (e.g. sensory attributes or the presence of other biologically active substances) or of a psychological nature (e.g. expectancy) are likely to play a significant role in mediating the responses observed in this study. SN - 0033-3158 UR - https://www.unboundmedicine.com/medline/citation/9784078/The_effects_of_black_tea_and_other_beverages_on_aspects_of_cognition_and_psychomotor_performance_ L2 - https://dx.doi.org/10.1007/s002130050709 DB - PRIME DP - Unbound Medicine ER -