Key result
Moderate activity drives a ~3-fold increase in oxygen consumption while rising temperatures lower venous pH.
Why the study?
The effects of temperature on gas exchange and acid-base balance in unrestrained loggerhead sea turtles during rest and routine activity were not fully understood.
Population
Unrestrained loggerhead sea turtles (Caretta caretta)
Comparison
Sea water temperatures of 10, 15, 20, and 30 °C at rest and during routine activity
Design
Physiological measurements in controlled temperature conditions
Authors
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Activity responses in sea turtles remain hypothesis-generating; does not inform human cardiovascular practice.
Temperature-related adjustments of blood pH in loggerhead sea turtles are managed at both the lung and tissue levels, associated with their unique mode of respiration.
Lutz et al. (1989) studied Unrestrained loggerhead sea turtles. Temperature changes (10, 15, 20, 30 °C) and activity was evaluated on Oxygen consumption, lung ventilation, plasma ion concentrations, osmolality, venous blood acid-base status and gas tensions. Moderate activity caused a threefold increase in oxygen consumption, and increasing temperature from 15 to 30°C decreased venous blood pH by 0.017 units per °C.
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