We investigated the effects of different diets on adipose tissue, liver, serum morphology, and biomarkers in rats that voluntarily exercised. Male Sprague-Dawley rats (~9–10 wk of age) exercised with resistanceloaded voluntary running wheels (EX; wheels loaded with 20–60% body mass) or remained sedentary (SED) over 6 wk. EX and SED rats were provided isocaloric amounts of either a ketogenic diet (KD; 20.2%-10.3%-69.5% protein-carbohydrate-fat), a Western diet (WD; 15.2%-42.7–42.0%), or standard chow (SC; 24.0%-58.0%-18.0%); n =8–10 in each diet for SED and EX rats. Following the intervention, body mass and feed efficiency were lowest in KD rats, independent of exercise (P < 0.05). Absolute and relative (body massadjusted) omental adipose tissue (OMAT) masses were greatest in WD rats (P < 0.05), and OMAT adipocyte diameters were lowest in KD-fed rats (P < 0.05). None of the assayed OMAT or subcutaneous (SQ) protein markers were affected by the diets[total acetyl coA carboxylase (ACC), CD36, and CEBPα or phosphorylated NF-κB/ p65, AMPKα, and hormone-sensitive lipase (HSL)], although EX unexpectedly altered some OMAT markers (i.e., higher ACC and phosphorylated NF-κB/p65, and lower phosphorylated AMPKα and phosphorylated HSL). Liver triglycerides were greatest in WD rats (P < 0.05), and liver phosphorylated NF-κB/p65 was lowest in KD rats (P < 0.05). Serum insulin, glucose, triglycerides, and total cholesterol were greater in WD and/or SC rats compared with KD rats (P < 0.05), and serum β-hydroxybutyrate was greater in KD vs. SC rats (P < 0.05). In conclusion, KD rats presented a healthier metabolic profile, albeit the employed exercise protocol minimally impacts any potentiating effects that KD has on fat loss.
|Original language||English (US)|
|Journal||American Journal of Physiology - Regulatory Integrative and Comparative Physiology|
|Publication status||Published - Aug 2016|
- Adipose tissue
- Ketogenic diet
ASJC Scopus subject areas
- Physiology (medical)