Caffeine Increases Sweating Sensitivity via Changes in Sudomotor Activity During Physical Loading
- Authors
- Kim, Tae-Wook; Shin, Young-Oh; Lee, Jeong-Beom; Min, Young-Ki; Yang, Hun-Mo
- Issue Date
- Nov-2011
- Publisher
- 한국식품영양과학회
- Keywords
- acetylcholine; mean body temperature; sweat gland density; tympanic temperature
- Citation
- Journal of Medicinal Food, v.14, no.11, pp 1448 - 1455
- Pages
- 8
- Journal Title
- Journal of Medicinal Food
- Volume
- 14
- Number
- 11
- Start Page
- 1448
- End Page
- 1455
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/16127
- DOI
- 10.1089/jmf.2010.1534
- ISSN
- 1096-620X
1557-7600
- Abstract
- We assessed the effect of caffeine on sudomotor activity and sweating sensitivity during physical loading. Both physiological responses could occur due to energy expenditure. Subjects were 13 athletically trained males (22.1 +/- 3.7 years old, 174.2 +/- 5.4 cm tall, and weighing 70.9 +/- 4.6 kg, with maximal oxygen consumption [VO(2)max] of 53.6 +/- 4.4 mL/kg/minute). The study involved a within-subject, random, crossover design. Tests were performed following the ingestion of 3 mg/kg caffeine. The physical loading involved running for 30 minutes at 60% VO(2)max (24.0 +/- 0.5 degrees C, 40 +/- 3.0% relative humidity). Tympanic temperature (TYMP) was significantly higher in the caffeine-consuming group (Caffe-I) at pre-exercise (40 minutes after caffeine intake and immediately before running) (P < .05). Mean body temperature (mT(b)) was significantly higher in the Caffe-I group at pre- and post-exercise (30 min after start of running) (P < .05). Onset time of localized sweating was significantly shorter in the Caffe-I group (P < .01), but localized sweat volume and active sweat gland output (per single gland) was significantly higher in the Caffe-I group (P < .001). Activated sweat gland density was significantly increased in the Caffe-I group on the abdomen and thigh (P < .01). In conclusion, caffeine ingestion caused not only increases in TYMP and mTb through thermogenesis, but also an increased sweating sensitivity via changes in sudomotor activity.
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