Record Details

Scholnick, David A;Gleeson, Todd T
Activity before exercise influences recovery metabolism in the lizard Dipsosaurus dorsalis
The Journal of Experimental Biology
Journal Article
Dipsosaurus dorsalis
During recovery from even a brief period of exercise, metabolic rate remains elevated above resting levels for extended periods. The intensity and duration of exercise as well as body temperature and hormone levels can influence this excess post-exercise oxygen consumption (EPOC). We examined the influence of activity before exercise (ABE), commonly termed warm-up in endotherms, on EPOC in the desert iguana Dipsosaurus dorsalis. The rate of oxygen consumption and blood lactate levels were measured in 11 female D. dorsalis (mass 41.1±3.0 g; mean ± S.E.M.) during rest, after two types of ABE and after 5 min of exhaustive exercise followed by 60min of recovery. ABE was either single (15 s of maximal activity followed by a 27 min pause) or intermittent (twelve 15 s periods of exercise separated by 2min pauses). Our results indicate that both single and intermittent ABE reduced recovery metabolic rate. EPOC volumes decreased from 0.261 to 0.156ml of oxygen consumed during 60min of recovery when lizards were subjected to intermittent ABE. The average cost of activity (net VO2 during exercise and 60min of recovery per distance traveled) was almost 40 % greater in lizards that exercised without any prior activity than in lizards that underwent ABE. Blood lactate levels and removal rates were greatest in animals that underwent ABE. These findings may be of particular importance for terrestrial ectotherms that typically use burst locomotion and have a small aerobic scope and a long recovery period.