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Assessment of Murine Exercise Endurance Without the Use of a Shock Grid: An Alternative to Forced Exercise
Published on: August 14, 2014
Green tea extract improves running endurance in mice by stimulating lipid utilization during exercise
Takatoshi Murase1, Satoshi Haramizu, Akira Shimotoyodome
1Biological Science Laboratories, Kao Corporation, 2606 Akabane, Ichikai-machi, Haga-gun, Tochigi 321-3497, Japan. murase.takatoshi@kao.co.jp
Summary
Green tea extract (GTE) significantly improved running endurance in mice by enhancing fatty acid utilization for energy in skeletal muscles. This suggests GTE boosts metabolic capacity during exercise.
Area of Science:
- Exercise Physiology
- Nutritional Biochemistry
- Metabolic Science
Background:
- Green tea is rich in polyphenols called catechins, widely consumed in Asia.
- Catechin-rich green tea extract (GTE) is investigated for its potential physiological effects.
Purpose of the Study:
- To investigate the effects of GTE on running endurance and energy metabolism during exercise in BALB/c mice.
- To determine if GTE influences key metabolic parameters related to endurance performance.
Main Methods:
- Mice were divided into control and GTE-supplemented groups (0.2% and 0.5%) and subjected to treadmill running.
- Measurements included running time to exhaustion, plasma parameters, muscle glycogen, beta-oxidation, malonyl-CoA, oxygen consumption, and respiratory exchange ratio.
Main Results:
- Mice fed 0.5% GTE showed 30% longer running times, with lower respiratory exchange ratio and higher muscle beta-oxidation and glycogen content.
- GTE supplementation led to lower plasma lactate and increased free fatty acid concentrations post-exercise.
Conclusions:
- GTE improves running endurance in mice, partly by increasing metabolic capacity for fatty acid utilization in skeletal muscle during exercise.
- These findings highlight the potential of GTE as a natural ergogenic aid.
