Effects of human head hair on performance and thermoregulatory responses during 10-km outdoor running in healthy men.
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2016
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The aim of the present study was to evaluate the effects of human head hair on
performance and thermoregulatory responses during 10-km outdoor running in healthy
men. Twelve healthy males (29.5 ± 3.7 years, 174.9 ± 4.3 cm, 72.7 ± 3.2 kg and VO2max
44.6 ± 3.4 ml.kg-1.min-1) participated in two self-paced outdoor 10-km running trials
separated by 7 days: 1) HAIR, subjects ran with their natural head hair; 2) NOHAIR,
subjects ran after their hair had been totally shaved. Average running velocity was calculated
from each 2-km running time. Rectal temperature, heart rate and physiological
strain index were measured before and after the 10-km runs and at the end of each 2 km.
The rate of heat storage was measured every 2 km. The environmental stress (WBGT)
was measured every 10 min. The running velocity (10.9 ± 1 and 10.9 ± 1.1 km.h-1), heart
rate (183 ± 10 and 180 ± 12 bpm), rectal temperature (38.82 ± 0.29 and 38.81 ± 0.49oC),
physiological strain index (9 ± 1 and 9 ± 1), or heat storage rate (71.9 ± 64.1 and 80.7 ±
56.7 W.m-1) did not differ between the HAIR and NOHAIR conditions, respectively
(p>0.05). There was no difference in WBGT between the HAIR and NOHAIR conditions
(24.0 ± 1.4 and 23.2 ± 1.5ºC, respectively; p=0.10). The results suggest that shaved
head hair does not alter running velocity or thermoregulatory responses during 10-km
running under the sun.
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Body temperature regulation, Solar radiation, Velocity
Citação
MARTINI, A. R. P. et al. Effects of human head hair on performance and thermoregulatory responses during 10-km outdoor running in healthy men. Revista Brasileira de Cineantropometria & Desempenho Humano, v. 18, p. 155-165, 2016. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1980-00372016000200155>. Acesso em: 29 ago. 2017.