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The acute physiological and mood effects of tea and coffee: the role of caffeine level.
Pharmacol Biochem Behav 2000; 66(1):19-28PB

Abstract

The objective of this study was to determine the effect of caffeine level in tea and coffee on acute physiological responses and mood. Randomised full crossover design in subjects after overnight caffeine abstention was studied. In study 1 (n = 17) the caffeine level was manipulated naturalistically by preparing tea and coffee at different strengths (1 or 2 cups equivalent). Caffeine levels were 37.5 and 75 mg in tea, 75 and 150 mg in coffee, with water and no-drink controls. In study 2 (n = 15) caffeine level alone was manipulated (water, decaffeinated tea, plus 0, 25, 50, 100, and 200 mg caffeine). Beverage volume and temperature (55 degrees C) were constant. SBP, DBP, heart rate, skin temperature, skin conductance, and mood were monitored over each 3-h study session. In study 1, tea and coffee produced mild autonomic stimulation and an elevation in mood. There were no effects of tea vs. coffee or caffeine dose, despite a fourfold variation in the latter. Increasing beverage strength was associated with greater increases in DBP and energetic arousal. In study 2, caffeinated beverages increased SBP, DBP, and skin conductance and lowered heart rate and skin temperature compared to water. Significant dose-response relationships to caffeine were seen only for SBP, heart rate, and skin temperature. There were significant effects of caffeine on energetic arousal but no consistent dose-response effects. Caffeinated beverages acutely stimulate the autonomic nervous system and increase alertness. Although caffeine can exert dose-dependent effects on a number of acute autonomic responses, caffeine level is not an important factor. Factors besides caffeine may contribute to these acute effects.

Authors+Show Affiliations

Cell Biology & Physiology Department, Unilever Research, Colworth House, Sharnbrook, MK44 ILQ, Bedford, UK.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

10837840

Citation

Quinlan, P T., et al. "The Acute Physiological and Mood Effects of Tea and Coffee: the Role of Caffeine Level." Pharmacology, Biochemistry, and Behavior, vol. 66, no. 1, 2000, pp. 19-28.
Quinlan PT, Lane J, Moore KL, et al. The acute physiological and mood effects of tea and coffee: the role of caffeine level. Pharmacol Biochem Behav. 2000;66(1):19-28.
Quinlan, P. T., Lane, J., Moore, K. L., Aspen, J., Rycroft, J. A., & O'Brien, D. C. (2000). The acute physiological and mood effects of tea and coffee: the role of caffeine level. Pharmacology, Biochemistry, and Behavior, 66(1), pp. 19-28.
Quinlan PT, et al. The Acute Physiological and Mood Effects of Tea and Coffee: the Role of Caffeine Level. Pharmacol Biochem Behav. 2000;66(1):19-28. PubMed PMID: 10837840.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The acute physiological and mood effects of tea and coffee: the role of caffeine level. AU - Quinlan,P T, AU - Lane,J, AU - Moore,K L, AU - Aspen,J, AU - Rycroft,J A, AU - O'Brien,D C, PY - 2000/6/6/pubmed PY - 2000/7/8/medline PY - 2000/6/6/entrez SP - 19 EP - 28 JF - Pharmacology, biochemistry, and behavior JO - Pharmacol. Biochem. Behav. VL - 66 IS - 1 N2 - The objective of this study was to determine the effect of caffeine level in tea and coffee on acute physiological responses and mood. Randomised full crossover design in subjects after overnight caffeine abstention was studied. In study 1 (n = 17) the caffeine level was manipulated naturalistically by preparing tea and coffee at different strengths (1 or 2 cups equivalent). Caffeine levels were 37.5 and 75 mg in tea, 75 and 150 mg in coffee, with water and no-drink controls. In study 2 (n = 15) caffeine level alone was manipulated (water, decaffeinated tea, plus 0, 25, 50, 100, and 200 mg caffeine). Beverage volume and temperature (55 degrees C) were constant. SBP, DBP, heart rate, skin temperature, skin conductance, and mood were monitored over each 3-h study session. In study 1, tea and coffee produced mild autonomic stimulation and an elevation in mood. There were no effects of tea vs. coffee or caffeine dose, despite a fourfold variation in the latter. Increasing beverage strength was associated with greater increases in DBP and energetic arousal. In study 2, caffeinated beverages increased SBP, DBP, and skin conductance and lowered heart rate and skin temperature compared to water. Significant dose-response relationships to caffeine were seen only for SBP, heart rate, and skin temperature. There were significant effects of caffeine on energetic arousal but no consistent dose-response effects. Caffeinated beverages acutely stimulate the autonomic nervous system and increase alertness. Although caffeine can exert dose-dependent effects on a number of acute autonomic responses, caffeine level is not an important factor. Factors besides caffeine may contribute to these acute effects. SN - 0091-3057 UR - https://www.unboundmedicine.com/medline/citation/10837840/The_acute_physiological_and_mood_effects_of_tea_and_coffee:_the_role_of_caffeine_level_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0091-3057(00)00192-1 DB - PRIME DP - Unbound Medicine ER -