|
KMID : 1161420110140111448
|
|
Journal of Medicinal Food
2011 Volume.14 No. 11 p.1448 ~ p.1455
|
|
|
Caffeine Increases Sweating Sensitivity via Changes in Sudomotor Activity During Physical Loading
|
|
Kim Tae-Wook
Shin Young-Oh
Lee Jeong-Beom
Min Young-Ki
Yang Hun-Mo
|
|
|
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 [VO2max] 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% VO2max (24.0±0.5°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 (mTb) 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.
|
|
|
KEYWORD
|
|
|
acetylcholine, mean body temperature, sweat gland density, tympanic temperature
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
 
|