Intermittent fasting compromises the performance of eutrophic rats submitted to resistance training.

Autor: Cavalcante LP; Graduate Program in Health Sciences, Faculty of Medicine, Federal University of Mato Grosso, Cuiabá, Mato Grosso, Brazil., Lima TDR; Graduate Program in Health Sciences, Faculty of Medicine, Federal University of Mato Grosso, Cuiabá, Mato Grosso, Brazil; University Centre of Várzea Grande, Várzea Grande, Mato Grosso, Brazil., de Almeida PC; Graduate Program in Health Sciences, Faculty of Medicine, Federal University of Mato Grosso, Cuiabá, Mato Grosso, Brazil., Tolazzi GJ; Graduate Program in Health Sciences, Faculty of Medicine, Federal University of Mato Grosso, Cuiabá, Mato Grosso, Brazil., Ávila ETP; Graduate Program in Health Sciences, Faculty of Medicine, Federal University of Mato Grosso, Cuiabá, Mato Grosso, Brazil., Navalta JW; University of Nevada Las Vegas, Las Vegas, Nevada, United States., Vieira Junior RC; Graduate Program in Health Sciences, Faculty of Medicine, Federal University of Mato Grosso, Cuiabá, Mato Grosso, Brazil; Faculty of Health Sciences, Mato Grosso State University, Cáceres, Mato Grosso, Brazil., Voltarelli FA; Graduate Program in Health Sciences, Faculty of Medicine, Federal University of Mato Grosso, Cuiabá, Mato Grosso, Brazil. Electronic address: voltarellifa@gmail.com.
Jazyk: angličtina
Zdroj: Nutrition (Burbank, Los Angeles County, Calif.) [Nutrition] 2021 Jun; Vol. 86, pp. 111187. Date of Electronic Publication: 2021 Feb 01.
DOI: 10.1016/j.nut.2021.111187
Abstrakt: Objectives: The aim of this study was to analyze the effects of intermittent fasting (IF) on the performance of rats subjected to resistance training ladder climbs (RTLCs).
Methods: Thirty-two Wistar rats (80-d-old) were placed into one of the following four groups (n = 8/group): control (C), which were fed a standard diet with no exercise; intermittent fasting (IF) rats underwent IF for 16 h/d, fed a standard diet for a period of 8 h/d with no exercise; trained control (TC) were fed a standard diet and submitted to RTLC; and trained intermittent fasting (TIF) underwent IF for 16 h/d, fed a standard diet for a period of 8 h/d, and submitted to RTLC. Training groups completed 6-wk of RTLC (3 × /wk). The maximal load test (MLT) was applied on two occasions: before the first RTLC session and at the end of week 6 of physical training. Its purpose was to compare changes in performance over time. Both blood collection and total extraction of the organs were performed at the end of the experimental period.
Results: Food intake was higher in the TC group than in either the IF or TIF groups. TC supported a higher load (g) during the final MLT compared with the C, IF, and TIF groups, 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 than in C and TC rats. There was no difference in aspartate transaminase and alanine transaminase enzyme activities or in creatinine and total cholesterol levels.
Conclusions: IF negatively affected RTLC performance. 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.
(Copyright © 2021 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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