Effects of caffeine and menthol on cognition and mood during simulated firefighting in the heat

This study examined the separate effects of caffeine and menthol on cognition and mood during simulated firefighting in the heat. Participants (N = 10) performed three trials in a counterbalanced order, either with 400 mg caffeine, menthol lozenges, or placebo. The simulated firefighting consisted o...

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Veröffentlicht in:	Applied ergonomics 2014-05, Vol.45 (3), p.510-514
Hauptverfasser:	Zhang, Yang, Balilionis, Gytis, Casaru, Catalina, Geary, Colleen, Schumacker, Randall E., Neggers, Yasmin H., Curtner-Smith, Matthew D., Richardson, Mark T., Bishop, Phillip A., Green, James M.
Format:	Artikel
Sprache:	eng
Schlagworte:	Affect - drug effects Biological and medical sciences Body Temperature - drug effects Caffeine Caffeine - pharmacology Central Nervous System Stimulants - pharmacology Cognition & reasoning Cognition - drug effects Cognitive performance Cross-Over Studies Dehydration Effects Emotions Ergonomics Ergonomics. Human factors Firefighters Firefighters - psychology Fires Fundamental and applied biological sciences. Psychology Heart Rate - drug effects Heat Hot Temperature - adverse effects Humans Hyperthermia Male Menthol - pharmacology Neuropsychological Tests Occupational psychology Physical Exertion - drug effects Protective clothing Psychology. Psychoanalysis. Psychiatry Psychology. Psychophysiology Simulation Weight Loss - drug effects Young Adult
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Beschreibung
Zusammenfassung:	This study examined the separate effects of caffeine and menthol on cognition and mood during simulated firefighting in the heat. Participants (N = 10) performed three trials in a counterbalanced order, either with 400 mg caffeine, menthol lozenges, or placebo. The simulated firefighting consisted of 2 bouts of 20-min treadmill exercise and one bout of 20-min stepping exercise in the heat with two brief 15-min rest periods between each exercise phase. Exercise induced significant dehydration (>3%) and elevated rectal temperature (>38.9 °C), for all three conditions. Neither caffeine nor menthol reduced perceived exertion compared to placebo (p > 0.05). Mood ratings (i.e., alertness, hedonic tone, tension) significantly deteriorated over time (p
ISSN:	0003-6870 1872-9126
DOI:	10.1016/j.apergo.2013.07.005