Effect of immersion cryotherapy on blood lactate clearance after exercise

rbcdh Revista Brasileira de Cineantropometria & Desempenho Humano Rev. bras. cineantropom. desempenho hum. 1415-8426 1980-0037 Universidade Federal de Santa Catarina Florianópolis, SC, Brazil The objective of this study was to analyze the effect of immersion cryotherapy on blood lactate removal, an important physiological parameter related to muscle fatigue, after high-intensity exercise. Fifteen soccer athletes (15 to 17 years) were randomized into an immersion group (IG, n=7) and a control group (CG, n=8). The athletes were subjected to a muscle fatigue inducer protocol (PIFM) on a cycle ergometer. Next, GI athletes underwent immersion cryotherapy for 10 minutes, with the lower limbs being immersed at 5±1º C, whereas CG athletes rested for 10 minutes. Blood samples were collected for the determination of lactate concentration before the PIFM and 3, 15 and 25 minutes after the end of exercise (post-3, post-15 and post-25, respectively). The PIFM resulted in a significant increase of blood lactate concentration in the athletes, which was similar in two groups. During the recovery period, lactate concentration decreased by 13.6% at post-15 and by 15.3% at post-25 in IG, whereas GC presented a decrease of 14.6% and 28.5% decrease at post-15 and post-25, respectively. Passive recovery resulted in a significant decrease of lactate concentration, whereas the same was not observed for cryotherapy. These results suggest that, for the parameters used in this study, immersion cryotherapy was less effective than rest in the removal of blood lactate after high-intensity exercise. ARTIGO ORIGINAL Efeito da crioterapia de imersão sobre a remoção do lactato sanguíneo após exercício Effect of immersion cryotherapy on blood lactate clearance after exercise Bruno Manfredini BaroniI ;Ernesto Cesar Pinto Leal JuniorI;II;III; Rafael Abeche GenerosiI; Gouglas GrosselliI; Sinara CensiI; Flavia BertollaI IUniversidade de Caxias do Sul. Laboratório do Movimento Humano. Instituto de Medicina do Esporte. Caxias do Sul, RS. Brasil. IIUniversidade de Caxias do Sul. Curso de Fisioterapia. Caxias do Sul, RS. Brasil. IIIUniversidade de Caxias do Sul. Curso de Educação Física. Caxias do Sul, RS. Brasil. Correspondencia para RESUMO O objetivo deste estudo foi analisar o efeito da crioterapia de imersão sobre a remoção do lactato sanguíneo, um importante parâmetro fisiológico relacionado à fadiga muscular, após exercício de alta intensidade. Para tanto, quinze atletas de futebol (15 a 17 anos) foram divididos em Grupo Imersão (GI, n=7) e Grupo Controle (GC, n=8). Os atletas foram submetidos a um protocolo indutor de fadiga muscular (PIFM) por exercício de alta intensidade em ciclo-ergômetro. Após, os atletas do GI realizaram a crioterapia de imersão, por 10 minutos, com os membros inferiores imersos a 5±1º C, enquanto os atletas do GC permaneceram 10 minutos em repouso. Foram coletadas amostras de sangue para análise da concentração de lactato previamente ao PIFM (PRÉ), assim como 3, 15 e 25 minutos após o término do exercício (respectivamente PÓS-3, PÓS-15 e PÓS-25). O PIFM elevou as concentrações de lactato sanguíneo dos atletas significativamente e de maneira similar nos dois grupos. No período de recuperação, o Gl apresentou redução da concentração de lactato de 13,6% no PÓS-15 e 15,3%, no PÓS-25, enquanto o GC apresentou 14,6% e 28,5% de redução, no PÓS-15 e PÓS-25, respectivamente. Observou-se que a recuperação passiva apresentou decréscimo significativo da concentração de lactato enquanto o mesmo não foi verificado com a crioterapia. A crioterapia de imersão, nos parâmetros adotados pelo estudo, apresentou-se menos efetiva que repouso para a remoção do lactato sanguíneo após exercício de alta intensidade. Palavras-chave: Crioterapia; Fadiga muscular; Recuperação muscular ABSTRACT The objective of this study was to analyze the effect of immersion cryotherapy on blood lactate removal, an important physiological parameter related to muscle fatigue, after high-intensity exercise. Fifteen soccer athletes (15 to 17 years) were randomized into an immersion group (IG, n=7) and a control group (CG, n=8). The athletes were subjected to a muscle fatigue inducer protocol (PIFM) on a cycle ergometer. Next, GI athletes underwent immersion cryotherapy for 10 minutes, with the lower limbs being immersed at 5±1º C, whereas CG athletes rested for 10 minutes. Blood samples were collected for the determination of lactate concentration before the PIFM and 3, 15 and 25 minutes after the end of exercise (post-3, post-15 and post-25, respectively). The PIFM resulted in a significant increase of blood lactate concentration in the athletes, which was similar in two groups. During the recovery period, lactate concentration decreased by 13.6% at post-15 and by 15.3% at post-25 in IG, whereas GC presented a decrease of 14.6% and 28.5% decrease at post-15 and post-25, respectively. Passive recovery resulted in a significant decrease of lactate concentration, whereas the same was not observed for cryotherapy. These results suggest that, for the parameters used in this study, immersion cryotherapy was less effective than rest in the removal of blood lactate after high-intensity exercise. Keywords: Cryotherapy; Muscle Fatigue; Muscle Recovery Texto completo disponível apenas em PDF. Full text available only in PDF format. Endereço para correspondência: Bruno Manfredini Baroni Universidade de Caxias do Sul (UCS) Instituto de Medicina do Esporte (IME) Rua Francisco Getúlio Vargas, 1130 –Bloco 70 CEP: 95070-560 - Caxias do Sul, Brasil E-mail: [e-mail] Recebido em 11/08/08 Revisado em 18/12/08 Aprovado em 27/04/09 Barnett A. 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