A suplementação de lactato é capaz de melhorar o desempenho de endurance em sujeitos em estado de fadiga mental?
Data
2023-09-27
Autores
Valim, Fernanda da Silva 
Orientadores
Azevedo, Paulo Henrique Silva Marques de
Tipo
Dissertação de mestrado
Título da Revista
ISSN da Revista
Título de Volume
Resumo
Objetivo: verificar se a suplementação com lactato de cálcio é capaz de
atenuar a queda do desempenho de endurance em sujeitos em estado de fadiga
mental. Métodos: o estudo foi conduzido no modelo duplo-cego e controlado por
placebo. Foram recrutados 10 corredores de ambos os sexos (6 mulheres e 4 homens)
com idade entre 18 e 40 anos, com prática mínima em corrida de 1 ano e frequência
de pelo menos 3 treinos na semana. Foram realizados cinco encontros com intervalo
de 5 e 7 dias entre eles. O primeiro encontro teve como objetivo a caracterização dos
indivíduos e a familiarização deles com os procedimentos da pesquisa. O segundo
encontro, chamado de situação controle, foi um encontro no qual foi solicitado que os
participantes corressem 5 km na esteira em seu melhor tempo. Já a situação fadiga
mental (FM) foi caracterizada pela realização do teste de Stroop (teste mentalmente
fatigante) antes dos 5 km de corrida. Nas duas últimas visitas, de número 4 e 5, os
participantes receberam placebo ou 150 mg de lactato de cálcio/kg de peso corporal
antes do teste de Stroop e então realizaram o time trial de 5 km. Foram analisados o
tempo de corrida, a frequência cardíaca, a percepção subjetiva de esforço. Além
disso, analisamos o nível de cansaço mental (através da Escala Visual Analógica) e o
desempenho no teste de Stroop. Resultados: por meio do teste de Stroop, observou se que a fadiga mental foi induzida. As condições de suplementação (lactato e
placebo) melhoraram o desempenho comparado à condição FM. A condição FM foi
similar ao controle. A frequência cardíaca e a percepção subjetiva de esforço foram
moduladas apenas pelo momento (quilômetro percorrido). Conclusão: a
suplementação de lactato não foi eficaz para melhorar o desempenho de endurance
em sujeitos em estado de fadiga mental.
Objective: To verify if the lactate supplementation can reduce the endurance performance loss in subjects in a mental fatigue state. Methods: The study was carried out in a double-blind model and controlled by placebo. Ten runners of both genders (6 women and 4 men) aged between 18 and 40 years old, with at least 1 year of running practice and frequency of at least 3 training sessions per week, were recruited. Five meetings were held with 5 and 7 days between them. The first one aiming at characterizing the individuals and familiarizing them with the research procedures. The second one, called the control situation, was a meeting in which participants were asked to run 5 km on the treadmill in their best time. Now, the mental fatigue situation was characterized by performing the Stroop test (mentally fatiguing test) before the 5 km run. On the last two visits, numbers 4 and 5, participants received a placebo or 150 mg of calcium lactate/kg of body weight before the Stroop test and finally performed the 5 km time trial. Running time, heart rate, Subjective Perceived Effort, level of mental fatigue (through the Visual Analog Scale) and performance on the Stroop test were analyzed. Results: Through the Stroop test it was observed that mental fatigue was induced. The supplementation conditions (lactate and placebo) improved performance compared to the mental fatigue condition. The mental fatigue condition was like the control. Heart rate and Subjective Perceived Effort were modulated only by the moment (kilometer covered). Conclusion: lactate supplementation was not effective in improving endurance performance in subjects in a state of mental fatigue.
Objective: To verify if the lactate supplementation can reduce the endurance performance loss in subjects in a mental fatigue state. Methods: The study was carried out in a double-blind model and controlled by placebo. Ten runners of both genders (6 women and 4 men) aged between 18 and 40 years old, with at least 1 year of running practice and frequency of at least 3 training sessions per week, were recruited. Five meetings were held with 5 and 7 days between them. The first one aiming at characterizing the individuals and familiarizing them with the research procedures. The second one, called the control situation, was a meeting in which participants were asked to run 5 km on the treadmill in their best time. Now, the mental fatigue situation was characterized by performing the Stroop test (mentally fatiguing test) before the 5 km run. On the last two visits, numbers 4 and 5, participants received a placebo or 150 mg of calcium lactate/kg of body weight before the Stroop test and finally performed the 5 km time trial. Running time, heart rate, Subjective Perceived Effort, level of mental fatigue (through the Visual Analog Scale) and performance on the Stroop test were analyzed. Results: Through the Stroop test it was observed that mental fatigue was induced. The supplementation conditions (lactate and placebo) improved performance compared to the mental fatigue condition. The mental fatigue condition was like the control. Heart rate and Subjective Perceived Effort were modulated only by the moment (kilometer covered). Conclusion: lactate supplementation was not effective in improving endurance performance in subjects in a state of mental fatigue.
Descrição
Citação
VALIM, Fernanda da Silva. A suplementação de lactato é capaz de melhorar o desempenho de endurance em sujeitos em estado de fadiga mental?. 2023. 40 f. Dissertação (Mestrado em Ciências do Movimento Humano e Reabilitação) - Universidade Federal de São Paulo, Instituto de Saúde e Sociedade, Santos, 2023.