Dietary conjugated linoleic acid increases endurance capacity of mice during treadmill exercise.
This study was designed to evaluate the effect of dietary conjugated linoleic acid (CLA) on endurance exercise and availability of metabolic substrates in mice. Four-week-old male BALB/c mice were randomized to a control group (normal diet) and a CLA group (normal diet + 1% CLA). Each animal group received its respective diet for 10 weeks and was subjected to forced running on a treadmill system to estimate their maximum endurance capacity at the end of the experiment. All mice were immediately sacrificed after prolonged exercise, and the major metabolic substrates were measured in serum and liver. The body weights of mice in the CLA group were lower than those of the control group after the 10 weeks. The maximum running time in CLA-fed mice was significantly longer, by 26%, compared to that of the control mice. Dietary CLA decreased the serum concentrations of triglycerides, nonesterified fatty acids, and urea nitrogen and significantly reduced the consumption of liver glycogen. The present study demonstrated that dietary CLA enhances the endurance capacity of mice by increasing fat utilization and reducing the consumption of stored liver glycogen as substrates for energy metabolism.
Kim
Jun Ho
JH
Department of Food and Biotechnology, Korea University, Jochiwon, Chungnam, Republic of Korea.
Park
Hui Gyu
HG
Pan
Jung Hoon
JH
Kim
Sang Ho
SH
Yoon
Ho Geun
HG
Bae
Gui Seck
GS
Lee
Hyungjae
H
Eom
Seok-Hyun
SH
Kim
Young Jun
YJ
D000818:Animals; D001806:Blood Urea Nitrogen; D004042:Dietary Fats, Unsaturated / Q000494:pharmacology*; D004734:Energy Metabolism; D005230:Fatty Acids, Nonesterified / Q000097:blood; D006003:Glycogen / Q000378:metabolism; D044243:Linoleic Acids, Conjugated / Q000097:blood / Q000494:pharmacology*; D008099:Liver / Q000378:metabolism; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D010807:Physical Endurance / Q000187:drug effects*; D005082:Physical Exertion; D014280:Triglycerides / Q000097:blood
D004042:Dietary Fats, Unsaturated; D005230:Fatty Acids, Nonesterified; D044243:Linoleic Acids, Conjugated; D014280:Triglycerides; D006003:Glycogen