Serum levels of appetite-regulating hormones and pro-inflammatory cytokines are ameliorated by a CLA diet and endurance exercise in rats fed a high-fat diet.
OBJECTIVE
This study examined whether conjugated linoleic acid (CLA) supplementation and endurance exercise affect appetite-regulating hormones and pro-inflammatory cytokines in rats.


METHODS
Seven-week-old male Sprague-Dawley rats were divided randomly into the high-fat diet sedentary group (HS, n=8), the 1.0% CLA supplemented high-fat diet sedentary group (CS, n=8), and the 1.0% CLA supplemented high-fat diet exercise group (CE, n=8). Rats in the CE group swam 60 min/day, 5 days/week for 4 weeks.


RESULTS
Leptin and insulin levels in the CS and CE groups were significantly lower than those in the HS group (p<0.001), whereas leptin (p<0.01) and insulin (p<0.05) levels decreased significantly in the CE compared to those in the CS group. Interleukin (IL)-1β (p<0.001) and IL-6 (p<0.01) levels in the CS and CE groups decreased significantly compared to those in the HS group. Leptin (IL-1β: r=0.835, p<0.001), IL-6 (r=0.607, p<0.05), insulin (IL-1β: r=0.797, p<0.01), and IL-6 (r=0.827, p<0.01) levels were positively related with pro-inflammatory cytokine levels.


CONCLUSIONS
Endurance exercise may play an important role during CLA supplementation of rats on a high-fat diet.
Institute of Sports Health Science, Sunmoon University, Chung Nam Republic of Korea.
Kangok
K
Cho
Institute of Sports Health Science, Sunmoon University, Chung Nam Republic of Korea.
Daekeun
D
Kwon
Institute of Sports Health Science, Sunmoon University, Chung Nam Republic of Korea.
Jaeyong
J
Park
Institute of Sports Health Science, Sunmoon University, Chung Nam Republic of Korea.
Youngju
Y
Song
Conjugated linoleic acid; Cytokine; Endurance exercise; Insulin; Leptin