Cardiorespiratory, enzymatic and hormonal responses during and after walking while fasting

• Autor(a) principal: Alves, José Manuel Vilaça Maio
• Data de Publicação: 2018
• Outros Autores: Muller, Fernanda, Rosa, Claudio, Payan-Carreira, Rita, Lund, Rafael, Matos, Filipe, Garrido, Nuno Domingos, Saavedra, Francisco José, Reis, Victor Manuel Machado de Ribeiro dos
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://doi.org/10.1371/journal.pone.0193702; http://hdl.handle.net/10348/11688

The aim of the presente study wast o bservewhetherper forming alow intensity endurance exercise following anover night fasted (FAST) orfed (FED) condition promotes different cardiorespiratory, enzymatic and hormonal responses. Nine male physical active subjects, (age21.89±2.52 years old, height 175.89±5.16cm, weight 72.10±4.31kg, estimated body fat 7.25±2.11%), randomly performed twoses sions of 45minutes’ low intensity exercise (individual ventilator thres hold) interspersed by seven days, differentiated on lyin whether they were provided with a standardized meal or not. Theoxygen consumption (VO2) and heart rate (HR) were measured continuous lyatthe 30-minrest, the45-minduring andthe 30-minpost-exercise. Thetestosterone(T) andcortisol (C) hormones were measured at rest, immediately post-exercise and 15 -min post-exercise. TheGlucose (GLU), Free fatty acids (FFA) and enzymelipase activity (ELP) were measured atrest, 15- minand 30-minexercise, immediately, 15-minand 30-minpost-exercise. Significant lylowervalues were observed in FED compared to FAST with: C (nmol/L) frompre (428.87±120.41; 454.62±148.33, respectively) to immediately post-exercise (285.10±85.86;465.66± 137.70, respectively) and 15-minpost-exercise (248.00±87.88;454.31±112.72,respectively) (p<0.05); and GLU at all times, with na exceptionat 15-minpost-exercise. The testosterone/cortisol ratio (T/C) was significant lyhigherin the FED compared with FAST from pre (0.05±0.02,0.05±0.01, respectively) to 15-minpost-exercise (0.08±0.03,0.05±0.02, respectively). Noother significant diferences were observed between conditions. We conclude that fasting prior to low intensity endurance exercise does not seem be advantageous, when it comes to fat loss, compared withth esame exercise performed after a meal.