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Head hair reduces sweat rate during exercise under the sun.
MedLine Citation:
PMID:  20683812     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The purpose of this study was to evaluate the effects of human head hair on thermoregulation during exercise carried out under solar radiation. 10 healthy male subjects (mean±SD: 25.1±2.5 yr; height: 176.2±4.0 cm; weight: 73.7±6.7 kg; VO(2max) 56.2±5.3 mLO(2)·kg (-1)·min (-1)) took part in 2 1 h-long trials of continuous exercise on a treadmill at 50% VO2(max) under solar radiation that were separated by at least 2 days. Whereas for the first trial they retained their natural head hair (HAIR), in the second trial their hair was totally shaved (NOHAIR). Several properties were measured, including environmental heat stress (Wet Bulb Globe Temperature index - WBGT, °C), heart rate, rectal temperature, skin temperature, head temperature, and global sweat rate. The main findings were that whereas there was a lower sweat rate in the HAIR condition (HAIR: 7.08±0.79 vs. NOHAIR: 7.67±0.79 g·m (-2)·min (-1); p=0.03), there were no significant differences in any of the other variables between the HAIR and NOHAIR trials. In conclusion, the presence of head hair resulted in a lower sweat rate.
Authors:
L G M Coelho; J B Ferreira-Junior; A R P Martini; D A Borba; D B Coelho; R L F Passos; M A da Fonseca; F A S Moura-Lima; L S Prado; L O C Rodrigues
Publication Detail:
Type:  Journal Article     Date:  2010-08-03
Journal Detail:
Title:  International journal of sports medicine     Volume:  31     ISSN:  1439-3964     ISO Abbreviation:  Int J Sports Med     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-08     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  779-83     Citation Subset:  IM    
Affiliation:
Laboratory of Exercise Physiology, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
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