Intermittent Fasting Compromises The Performance Of Eutrophic Rats Submitted To Resistance Physical Training

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Medicine and Science in Sports and Science





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PURPOSE: This study analyzed the effects of intermittent fasting (IF) on the performance of rats subjected to resistance training ladder climbs (RTLC). METHODS: Thirty-two Wistar rats (80 days old) were divided into 4 groups: Control (C; n = 8): fed a standard diet with no exercise; Intermittent fasting (IF; n = 8): IF for 16 h / day fed a standard diet for a period of 8 h / day with no exercise; Trained Control (TC; n = 8): fed a standard diet and submitted to RTLC; Trained Intermittent Fasting (TIF; n = 8): IF for 16 h / day, fed a standard diet for a period of 8 h / day and submitted to RTLC. Training groups completed 6-weeks of RTLC (3x / week). RESULTS: Food intake was higher in TC compared to IF and TIF. TC supported a higher load (g) during the final MLT compared to the C, IF, and TIF, respectively. TC (initial MLT: 371.4 ± 31.1; final MLT: 593.9 ± 33.5) and TIF (initial MLT: 402.3 ± 31.8; final MLT: 495.4 ± 83.3) presented higher values when the pre and post RTLC moments were compared. The relative weight of the stomach was higher in TIF compared to C and TC. There was no difference for AST and ALT enzymes activities as well as creatinine, and total cholesterol levels. IF negatively affected RTLC performance. CONCLUSIONS: IF plus RTLC increased the relative weight of the stomach as well as reduced food intake, without an increase in body weight, suggesting this combination may have promoted dilation of this organ, due, hypothetically, to the scarcity of food for several hours and the energy expenditure generated by physical training.

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Intermittent fasting; Physical fitness--Testing


Biochemical Phenomena, Metabolism, and Nutrition | Exercise Physiology | Exercise Science



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