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Thermoregulatory effects of caffeine ingestion during submaximal exercise in men.
Aviat Space Environ Med. 1998 Dec; 69(12):1178-81.AS

Abstract

BACKGROUND

The exclusive effect of caffeine ingestion on exercise thermoregulation is unclear; data indicate that caffeine may have a positive effect, a negative effect, or no effect.

METHODS

Rectal (TRE) and mean skin (TSK) temperatures, skin heat conductance (HSK), and sweat rate (MSW) were measured during 30 min of rest and subsequent 70 min of submaximal cycle-ergometer exercise (67% VO2PEAK) in 11 aerobically conditioned men (mean +/- SD 29 +/- 6 yr, 49 +/- 6 mL x min(-1) x kg(-1) VO2PEAK) under two conditions: a caffeine (10 mg x kg(-1) ingestion (CI) session and a noncaffeine ingestion (NCI) control session.

RESULTS

There were no significant differences in physiological or thermoregulatory parameters during exercise: X (+/-SE) end exercise levels for the NCI and CI sessions, respectively, were VO2 = 2.50 +/- 0.09 vs. 2.55 +/- 0.09 L x min(-1); heart rate = 145 +/- 7 vs. 145 +/- 5 bpm; HSK = 30 +/- 3 vs. 28 +/- 3 kcal x m(-2) x h(-1) x degrees C(-1); MSW = 393 +/- 35 vs. 378 +/- 36 g x m(-2) x h(-1); and TRE = 38.3 +/- 0.2 vs. 38.4 +/- 0.1 degrees C. Control TSK was lower than that for CI by 0.4 to 0.5 degrees C at rest and during exercise.

CONCLUSION

Ingestion of a high level (10 mg x kg(-1) of caffeine has no effect on skin heat conductance, sweating, or the rate of increase and final level of rectal temperature during moderate, submaximal leg exercise.

Authors+Show Affiliations

Exercise Physiology Laboratory, San Jose State University, CA, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Controlled Clinical Trial
Journal Article

Language

eng

PubMed ID

9856543

Citation

Dunagan, N, et al. "Thermoregulatory Effects of Caffeine Ingestion During Submaximal Exercise in Men." Aviation, Space, and Environmental Medicine, vol. 69, no. 12, 1998, pp. 1178-81.
Dunagan N, Greenleaf JE, Cisar CJ. Thermoregulatory effects of caffeine ingestion during submaximal exercise in men. Aviat Space Environ Med. 1998;69(12):1178-81.
Dunagan, N., Greenleaf, J. E., & Cisar, C. J. (1998). Thermoregulatory effects of caffeine ingestion during submaximal exercise in men. Aviation, Space, and Environmental Medicine, 69(12), 1178-81.
Dunagan N, Greenleaf JE, Cisar CJ. Thermoregulatory Effects of Caffeine Ingestion During Submaximal Exercise in Men. Aviat Space Environ Med. 1998;69(12):1178-81. PubMed PMID: 9856543.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Thermoregulatory effects of caffeine ingestion during submaximal exercise in men. AU - Dunagan,N, AU - Greenleaf,J E, AU - Cisar,C J, PY - 1998/12/18/pubmed PY - 1998/12/18/medline PY - 1998/12/18/entrez KW - NASA Center ARC KW - NASA Discipline Regulatory Physiology SP - 1178 EP - 81 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 69 IS - 12 N2 - BACKGROUND: The exclusive effect of caffeine ingestion on exercise thermoregulation is unclear; data indicate that caffeine may have a positive effect, a negative effect, or no effect. METHODS: Rectal (TRE) and mean skin (TSK) temperatures, skin heat conductance (HSK), and sweat rate (MSW) were measured during 30 min of rest and subsequent 70 min of submaximal cycle-ergometer exercise (67% VO2PEAK) in 11 aerobically conditioned men (mean +/- SD 29 +/- 6 yr, 49 +/- 6 mL x min(-1) x kg(-1) VO2PEAK) under two conditions: a caffeine (10 mg x kg(-1) ingestion (CI) session and a noncaffeine ingestion (NCI) control session. RESULTS: There were no significant differences in physiological or thermoregulatory parameters during exercise: X (+/-SE) end exercise levels for the NCI and CI sessions, respectively, were VO2 = 2.50 +/- 0.09 vs. 2.55 +/- 0.09 L x min(-1); heart rate = 145 +/- 7 vs. 145 +/- 5 bpm; HSK = 30 +/- 3 vs. 28 +/- 3 kcal x m(-2) x h(-1) x degrees C(-1); MSW = 393 +/- 35 vs. 378 +/- 36 g x m(-2) x h(-1); and TRE = 38.3 +/- 0.2 vs. 38.4 +/- 0.1 degrees C. Control TSK was lower than that for CI by 0.4 to 0.5 degrees C at rest and during exercise. CONCLUSION: Ingestion of a high level (10 mg x kg(-1) of caffeine has no effect on skin heat conductance, sweating, or the rate of increase and final level of rectal temperature during moderate, submaximal leg exercise. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/9856543/Thermoregulatory_effects_of_caffeine_ingestion_during_submaximal_exercise_in_men_ L2 - https://medlineplus.gov/exerciseandphysicalfitness.html DB - PRIME DP - Unbound Medicine ER -