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Background  The influence of feed restriction and different diet's caloric value on the aerobic and anaerobic capacity is unclear in the literature. Thus, the objectives of this study were to determine the possible influences of two diets with different caloric values and the influence of feed restriction on the aerobic (anaerobic threshold: AT) and anaerobic (time to exhaustion: Tlim) variables measured by a lactate minimum test (LM) in rats.    Methods  We used 40 adult Wistar rats. The animals were divided into four groups:  ad libitum  commercial Purina ®  diet (3028.0 Kcal/kg) (ALP), restricted commercial Purina ®  diet (RAP),  ad libitum  semi-purified AIN-93 diet (3802.7 Kcal/kg) (ALD) and restricted semi-purified AIN-93 diet (RAD). The animals performed LM at the end of the experiment, 48 h before euthanasia. Comparisons between groups were performed by analysis of variance (p < 0,05).    Results  At the end of the experiment, the weights of the rats in the groups with the restricted diets were significantly lower than those in the groups with  ad libitum  diet intakes. In addition, the ALD group had higher amounts of adipose tissue. With respect to energetic substrates, the groups subjected to diet restriction had significantly higher levels of liver and muscle glycogen. There were no differences between the groups with respect to AT; however, the ALD group had lower lactatemia at the AT intensity and higher Tlim than the other groups.    Conclusions  We conclude that dietary restriction induces changes in energetic substrates and that  ad libitum  intake of a semi-purified AIN-93 diet results in an increase in adipose tissue, likely reducing the density of the animals in water and favouring their performance during the swimming exercises.

Feed restriction and a diet's caloric value: The influence on the aerobic and anaerobic capacity of rats