O resfriamento corporal pré-exercício retarda a redução de potência causada pela realização do exercício em ambiente quente, e não influencia o desempenho em ambiente temperado

• Ano de defesa: 2012
• Autor(a) principal: Andre Maia Lima
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Fadiga; Resfriamento corporal pré-exercício; Termorregulação; Ciclismo; Corpo Temperatura Regulação; Exercícios físicos Aspectos fisiológicos; Esportes Aspectos fisiológicos
• Link de acesso: http://hdl.handle.net/1843/KMCM-975PA3

One of the most important factors for fatigue is the increase of the body core temperature, which can be mitigated by pre-exercise body cooling. The aim of this study was to assess the effects of whole-body pre-cooling strategy in power output during 30 km self-paced cycling in warm and temperate environments. Eight males athletes cyclists (age 28,87 ± 0,97 years old, VO2max 55,77 ± 2,79 ml.kg-1.min-1, body mass 77,55 ± 2,7 kg, height 181 ± 0,02 cm, 10 ± 4% body fat) performed voluntarily in this study. The volunteers performed 30 km self-paced cycling exercise, riding as fast as possible in a warm (35°C, 68% RH; SR35) and temperate (24°C, 68% RH; SR24) environment and after being subjected to a pre-cooling activity through the immersion in water at 24°C in both environments (RESF35 and RESF24). The whole-body pre-cooling strategy (RESF35) delayed the reduction in exercise intensity noticed in control condition on the warm scenario (SR35), when compared against the control condition in the temperate environment (SR24), resulting in a shorter time for completion of the 30km activity. The whole-body pre-cooling strategy in the temperate environment did not affect the overall performance. Rectal temperature remained lower throughout the exercise in RESF35 compared to SR35, and it was not higher than when compared to SR24. Heat storage rate was higher in both body pre-cooling scenarios when compared to control conditions in the same environment. The body pre-cooling did not affect skin temperature, thermal comfort, rating of perceived exertion, HR, VO2, water intake and sweating rate during exercise in either environment. Conclusion: The whole-body pre-cooling strategy delayed the reduction in power output induced by exercising in a warm environment when compared to temperate environment. On this environment, pre-cooling did not influence performance.