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Cardiovascular and metabolic responses to the ingestion of caffeinated herbal tea: is it healthier to drink it cold?
Author(s) -
Maufrais Claire,
Sarafian Delphine,
Dulloo Abdul,
Montani JeanPierre
Publication year - 2018
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.2018.32.1_supplement.767.7
Subject(s) - ingestion , medicine , caffeine , heart rate , blood pressure , food science , chemistry
Aim Tea is usually drunk either hot or cold. The purpose of this study was to compare the cardiovascular and metabolic responses to the ingestion of caffeinated herbal tea (Yerba Mate) at cold or hot drink temperature in healthy young subjects. We hypothesized that ingestion of cold tea induces a higher increase in energy expenditure (EE) than hot tea without eliciting any negative effects on the cardiovascular system. Methods Cardiovascular, metabolic and cutaneous responses were analyzed in twenty‐three healthy subjects (twelve men and eleven women) sitting comfortably with a 30‐min baseline and 90 min following ingestion of 500 mL of an unsweetened Yerba Mate tea ingested over 5 min either at cold (~3 °C) or hot (~55 °C) temperature, according to a randomized cross‐over design. Results Averaged over the 90 min post‐drink ingestion and compared to hot tea, cold tea induced a decrease in heart rate (cold tea: −5 ± 1 beats.min −1 ; hot tea: −1 ± 1 beats.min −1 ), double product, skin blood flow and hand temperature and an increase in baroreflex sensitivity, fat oxidation and EE (cold tea: +8.3 %; hot tea: +3.7 %). Averaged over the 90 min post‐drink ingestion, we observed no differences in tea temperature on cardiac output work and mean blood pressure responses. Conclusion Ingestion of an unsweetened caffeinated herbal tea at cold temperature induced a greater stimulation of thermogenesis and fat oxidation than hot tea, without eliciting any negative effects on the cardiovascular system. Further experiments are needed to evaluate the clinical impact of unsweetened caffeinated herbal tea at a cold temperature for weight control. Support or Funding Information Swiss Heart Foundation