Cold acclimation and endurance training in guinea pigs: changes in daily and maximal metabolism.
The physiological effects of training or cold acclimation on maximal oxygen uptake (VO2,max) and average daily metabolic rate (VO2,dav) of a small mammal, the guinea pig, are described. Young male guinea pigs were assigned to three experimental groups; control, endurance trained (70% VO2,max) or cold acclimated (5-7 degrees C) for six weeks. Measurements of VO2,max and VO2,dav were made before and after the treatments. VO2,max increased significantly in cold acclimated (+29%) and endurance trained (+23%) animals and was achieved at a higher maximal running speed compared to post-treatment controls. Maximal blood lactate concentration was significantly higher in cold acclimated compared to endurance trained animals. Endurance trained animals had a reduced VO2,dav compared to control animals, whereas cold acclimation raised VO2,dav in the cold as expected, but also at room temperature. All three groups showed a daily pattern in metabolic rate (night > day). In conclusion, both endurance training and cold acclimation lead to enhanced VO2,max and changes in resting oxygen consumption throughout the day.
Turner
D L
DL
Department of Anatomy, University of Bern, Switzerland.
Hoppeler
H
H
Hokanson
J
J
Weibel
E R
ER
D000064:Acclimatization; D000375:Aging / Q000378:metabolism; D000818:Animals; D001481:Basal Metabolism; D001835:Body Weight; D003080:Cold Temperature; D006168:Guinea Pigs; D007773:Lactates / Q000097:blood; D019344:Lactic Acid; D008297:Male; D010101:Oxygen Consumption; D010805:Physical Conditioning, Animal; D012119:Respiration; D013696:Temperature
D007773:Lactates; D019344:Lactic Acid