The Relationship of Oxygen Supply for Activity to Body Temperature in Four Species of Lizards

Wilson, Kerry‐Jayne

doi:10.2307/1442592

Cited by 55 publications

(66 citation statements)

References 37 publications

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“…Thus, for most vertebrates, the cardiac O 2 pulse changes systematically during any activity such that a strong relationship between f H and V O 2 is maintained (Wilson 1974;Gleeson et al 1980;Grubb et al 1983;Butler et al 1992;Clark et al 2005a, b). However, this has not always been the case when comparing the f H /V O 2 relationship between different activities.…”

Section: The Correlation Between Heart Rate and Metabolic Ratementioning

confidence: 99%

The relationship between body temperature, heart rate, breathing rate, and rate of oxygen consumption, in the tegu lizard (Tupinambis merianae) at various levels of activity

et al. 2015

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The present study determined whether EEG and/or EMG recordings could be used to reliably define activity states in the Brazilian black and white tegu lizard (Tupinambis merianae) and then examined the interactive effects of temperature and activity states on strategies for matching O2 supply and demand. In a first series of experiments, the rate of oxygen consumption (VO2), breathing frequency (fR), heart rate (fH), and EEG and EMG (neck muscle) activity were measured in different sleep/wake states (sleeping, awake but quiet, alert, or moving). In general, metabolic and cardio-respiratory changes were better indictors of the transition from sleep to wake than were changes in the EEG and EMG. In a second series of experiments, the interactive effects of temperature (17, 27 and 37 °C) and activity states on fR, tidal volume (VT), the fraction of oxygen extracted from the lung per breath (FIO2-FEO2), fH, and the cardiac O2 pulse were quantified to determine the relative roles of each of these variables in accommodating changes in VO2. The increases in oxygen supply to meet temperature- and activity-induced increases in oxygen demand were produced almost exclusively by increases in fH and fR. Regression analysis showed that the effects of temperature and activity state on the relationships between fH, fR and VO2 was to extend a common relationship along a single curve, rather than separate relationships for each metabolic state. For these lizards, the predictive powers of fR and fH were maximized when the effects of changes in temperature, digestive state and activity were pooled. However, the best r(2) values obtained were 0.63 and 0.74 using fR and fH as predictors of metabolic rate, respectively.

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Section: The Correlation Between Heart Rate and Metabolic Ratementioning

confidence: 99%

The relationship between body temperature, heart rate, breathing rate, and rate of oxygen consumption, in the tegu lizard (Tupinambis merianae) at various levels of activity

et al. 2015

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“…In the lizard V. salvator, ratios of Veff to V 0 2 indicate that this species increases ventilation threefold relative to increases in oxygen consumption. Such is also the case for other lizards and snakes (Dmi'el 1972;Wilson 1971). Ventilation is sufficient t o maintain oxygenation of arterial blood, and thus, prevent an even greater reliance on anaerobic metabolism during exercise.…”

Section: Ventilation During Exhaustive Exercisementioning

confidence: 94%

“…Exhaustive exercise elicits an immediate increase in lung ventilation. Minute ventilation increases five-t o sixfold during such exercise in lizards and snakes (Drni'el 1972;Bennett 1973a;Wilson 1971). Effective lung ventilation (Veff) during 5 min of treadmill running increases to rates approaching 20 times standard rates in the lizard Varanus salvator.…”

Section: Ventilation During Exhaustive Exercisementioning

confidence: 99%

“…Consequently, this aspect of oxygen delivery decreases as the metabolic demand for oxygen increases. In fact, at high body temperatures when VOz ,,, is greatest, the factorial increment in OP during exercise may be significantly reduced (Bennett 1972;Dmi'el and Borut 1972;Wilson 1971). Decreasing maximal OP with increases in body temperature requires that either or both maximum oxygen extraction and stroke volume must decrease.…”

Section: Oxygen Pulsementioning

confidence: 99%

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Respiratory and Cardiovascular Adjustments to Exercise in Reptiles

Gleeson

Bennett

1985

Proceedings in Life Sciences

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“…Maximization of aerobic scope near preferred body temperature is a common feature of saurian metabolism (Wilson, 1974), but one that seems inappropriate for Amblyrh!n~hus. Nevertheless, aerobic scope of this lizard peaks at basking body temperature (ca.…”

mentioning

confidence: 99%

A REAPPRAISAL OF THE AQUATIC SPECIALIZATIONS OF THE GALAPAGOS MARINE IGUANA ( AMBLYRHYNCHUS CRISTATUS )

1977

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The Relationship of Oxygen Supply for Activity to Body Temperature in Four Species of Lizards

Cited by 55 publications

References 37 publications

The relationship between body temperature, heart rate, breathing rate, and rate of oxygen consumption, in the tegu lizard (Tupinambis merianae) at various levels of activity

The relationship between body temperature, heart rate, breathing rate, and rate of oxygen consumption, in the tegu lizard (Tupinambis merianae) at various levels of activity

Respiratory and Cardiovascular Adjustments to Exercise in Reptiles

A REAPPRAISAL OF THE AQUATIC SPECIALIZATIONS OF THE GALAPAGOS MARINE IGUANA ( AMBLYRHYNCHUS CRISTATUS )

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