Prolonged Swimming Exercise Does Not Affect Contents and Fatty Acids Composition of Rat Muscle Triacylglycerol

Abstract

The present study investigated whether or not muscle triacylglycerol (MTG) contributed as a main energy source and MTG level and utilized fatty acid (FA) composition decreased during a 4-hour swimming exercise in rats fed a normal diet or a high-fat diet (HFD). Sixty male Wistar rats aged 5 weeks were fed a normal diet (CE-2, n = 25, experiment A) or HFD (n = 35, experiment B) for 22 days. On the final day, rats in both experiments were killed either without exercise or 1, 2, 3, or 4 hours after beginning the swimming exercise. MTG accumulation was higher in rats fed the HFD than those fed the CE-2 in both slow-and fast-typed muscles. Serum concentrations of free fatty acids (FFA) and glucose were increased and muscle glycogen contents were decreased with the continuance of swimming exercise, especially in rats fed the CE-2. The prolonged swimming did not influence MTG contents and FA compositions of MTG in either the experiment. These results might indicate that specific FA of MTG was not oxidized and MTG did not contribute as a main energy source during the prolonged swimming exercise in rats; instead, serum FFA, glucose, and muscle glycogen were mainly used.

Efeitos da suplementação carboidratada e de diferentes tipos de treinamento físico sobre as concentrações de células sanguíneas

“…In male Wistar rats fed with normal diet and submitted to swimming training with different duration, it was identified that glycemia was higher in the groups which swam for two to four hours, compared with the animals from the group which did not exercise 21 . In male Wistar rats fed with carbohydrate-rich diet or fat-rich diet and whose blood collections were performed pre and post-swimming exercise, it was observed that the serum glucose concentration was not different among the experimental groups in the post-exercise 22 .…”

Efeito de consumo de carboidrato e de exercício físico sobre a concentração de glicogênio

“…In a study on male Wistar rats fed a high-carbohydrate or high-fat diet in which blood samples were collected pre-and post-swimming exercise, serum glucose concentration only differed between the pre-and post-exercise experimental groups 20 , i.e., between rested animals and animals submitted to 1 h of swimming. When male Wistar rats fed a normal diet and submitted to swimming training of different durations were studied, the groups swimming for 2 and 4 h exhibited higher glucose levels than untrained animals 21 . In another study, no difference in glucose levels was observed between adult male Wistar rats submitted to 4 weeks of swimming exercise with an overload of 5% of body weight and the sedentary group 22 .…”

Efeitos do treinamento moderado contínuo sobre parâmetros imunológico e metabólico de ratos suplementados com maltodextrina

“…Em relação à glicemia a literatura demonstra que, em ratos machos Wistar alimentados com dieta normal e submetidos a treinamento de natação com diferentes durações se identifi cou que a glicemia foi maior nos grupos que nadaram por duas e quatro horas, comparados aos animais do grupo que não se exercitou (OCHIAI & MATSUO, 2009a). Ratos Wistar machos alimentados com dieta rica em carboidratos ou dieta rica em gorduras e cujas coletas sanguíneas foram realizadas pré e pós-exercício de natação se observou que a concentração de glicose sérica não diferiu entre os grupos experimentais no pós-exercício (OCHIAI & MATSUO, 2009b).…”