METABOLIC DYSFUNCTIONS CAUSED BY EARLY FRUCTOSE INGESTION ARE PREVENTED IN CONCURRENTLY EXERCISED ADULT MALE RATS

Resumen

This study evaluated whether fructose ingestion at adolescence programs the development of
metabolic syndrome (MetS) in adult rats and whether moderate-intensity combined exercise
can attenuate fructose-induced MetS compounds. Pubertal rats were trained on a treadmill
(55-65% VO 2max ), 3 times/week, 44 min/session, for one month. They were allocated into four
groups: sedentary control (SC), trained control (TC), sedentary fructose (SF), and trained
fructose (TF). Groups F ingested 10% fructose. Food intake (AI) and body weight (BW) were
measured weekly. At 60 and 120 days of age, metabolic parameters were evaluated. Fructose
intake mainly affected animals in adult life, and these changes were related to glucose
intolerance (p=0.001), periepididymal fat (p<0.03), and increase in total cholesterol (TC) (p
<0.001), triglycerides (TAGs) (p<0.0001) and insulin (p<0.0001) levels. Early physical
exercise was able to decrease periepididymal (p<0.003) and retroperitoneal (p<0.0002)
adipose tissue, TC levels (p<0.0001) and glucose tolerance (p=0.21). Rats that received
combined treatments during adolescence showed low glycemia (p=0.003) and insulinemia
(p<0.0001) during the intraperitoneal glucose tolerance test (ipGTT). HOMA-IR (p=0.02) and
TYG (p=0.0003) scores also improved in these rats. We conclude that early ingestion of 10%
fructose was effective in programming adult rats to MetS, and simultaneous moderate
exercise attenuated these aggressions, causing changes in glycemic homeostasis and lipid
metabolism.