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Keywords: cardiac output
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Journal Articles
J Exp Biol (2021) 224 (15): jeb242614.
Published: 29 July 2021
... scope. Cardiac output was significantly elevated under hyperoxia at Ṁ O 2 ,max because of increased stroke volume, indicating that hyperoxia released a constraint on cardiac contractility apparent with normoxia. Thus, hyperoxia improved maximal cardiac performance, thereby enhancing tissue O 2 delivery...
Journal Articles
J Exp Biol (2020) 223 (4): jeb215335.
Published: 20 February 2020
...William Joyce; Tobias Wang ABSTRACT In the 1950s, Arthur C. Guyton removed the heart from its pedestal in cardiovascular physiology by arguing that cardiac output is primarily regulated by the peripheral vasculature. This is counterintuitive, as modulating heart rate would appear to be the most...
Journal Articles
J Exp Biol (2019) 222 (6): jeb197426.
Published: 27 March 2019
...William Joyce; Daniel W. White; Peter B. Raven; Tobias Wang ABSTRACT Vascular resistance and conductance are reciprocal indices of vascular tone that are often assumed to be interchangeable. However, in most animals in vivo , blood flow (i.e. cardiac output) typically varies much more than arterial...
Journal Articles
J Exp Biol (2019) 222 (5): jeb198457.
Published: 7 March 2019
... to the internal organs, and the stroke volume and cardiac output during the surface state. We then simulated breath-holding conditions and perfusion of the internal organs under the diving-induced bradycardia and reduction of stroke volume and cardiac output, using 10 beats min −1 as the limit for the heart rate...
Journal Articles
J Exp Biol (2018) 221 (18): jeb185967.
Published: 24 September 2018
... of Biologists Ltd 2018 http://www.biologists.com/user-licence-1-1/ Summary: Late stage snapping turtle embryos present increased oxygen carrying capacity and decreased cardiac output index and heart rate, which contribute to the reported patterns of turtle whole-egg V̇ O 2 . Cardiovascular...
Journal Articles
J Exp Biol (2018) 221 (15): jeb183160.
Published: 13 August 2018
... imposed activity. Chaenocephalus aceratus had a lower routine f H than N. coriiceps (9 beats min −1 versus 14 beats min −1 ) and a lower peak f H during acute warming (38 beats min −1 versus 55 beats min −1 ) with a similar cardiac breakpoint temperature (13 and 14°C, respectively). Routine cardiac output...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (22): 4186–4194.
Published: 15 November 2017
...). Cardiac output (ml min −1  kg −1 ) was calculated from the Fick equation using V̇ O 2  and C a O 2 − C v O 2 . Stroke volume (ml kg −1 ) was the quotient of cardiac output and heart rate. Total peripheral resistance (kPa min kg ml −1 ) was the quotient of mean arterial pressure and cardiac output...
Journal Articles
J Exp Biol (2017) 220 (14): 2589–2597.
Published: 15 July 2017
... and heart rate ( f H ) before and after a ∼5% body mass meal. In adult N21 and H10 turtles, f H was increased significantly by feeding. Although total stroke volume ( V S,tot ) remained at fasted values, this tachycardia contributed to an elevation in total cardiac output ( ). However...
Journal Articles
J Exp Biol (2016) 219 (13): 1974–1984.
Published: 1 July 2016
..., the blood-oxygen carrying capacity was higher than that of barnacle geese. Resting cardiac output also did not differ between groups and increased at least twofold during progressive hypoxia, initially as a result of increases in stroke volume. However, cardiac output increased at a higher F i O 2 threshold...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (3): 457–463.
Published: 1 February 2016
... pressures to calculate left ventricular wall stress. Cardiac output was also determined by inert gas rebreathing to provide an additional and independent estimate of stroke volume. Echocardiography and inert gas-rebreathing yielded similar cardiac outputs of 16.1±2.5 and 16.4±1.4 l min −1 , respectively...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (22): 4006–4014.
Published: 15 November 2012
.... hearts from 10°C fish cooled to 4°C, and hearts from 4°C fish measured at 10 and 0°C. Intrinsic heart rate ( f H ) decreased from 41 beats min −1 at 10°C to 33 beats min −1 at 4°C and 25 beats min −1 at 0°C. However, this degree of thermal dependency was not reflected in maximal cardiac output ( Q max...
Journal Articles
J Exp Biol (2011) 214 (18): 3074–3081.
Published: 15 September 2011
... exceeding T opt , these findings offer a physiological explanation for the continuing success of this species throughout the current climate-warming period. Despite this, declining cardiac output was evident above 17°C, and maximum attainable swimming speed was impaired above ∼23°C, suggesting negative...
Journal Articles
J Exp Biol (2011) 214 (9): 1445–1457.
Published: 1 May 2011
... adenylyl cyclase cardiac output binding affinity HEK293 cells Adrenergic receptors (adrenoreceptors, ARs) are G-protein-coupled receptors that transduce the cellular effects of adrenaline and noradrenaline and are expressed ubiquitously in vertebrate tissues (e.g. Cavalli et al., 1997 ; Tanoue...
Journal Articles
J Exp Biol (2010) 213 (21): 3692–3698.
Published: 1 November 2010
... the anoxic bradycardia, such that cardiac output decreased by only 33% from the routine value of 12.3±0.9 ml min –1 kg –1 . Cardiac power output decreased by only 25% from the routine value of 0.26±0.02 mW g –1 . During recovery from prolonged anoxia, cardiac output and heart rate increased to peak values...
Journal Articles
J Exp Biol (2010) 213 (13): 2332–2342.
Published: 1 July 2010
... were restricted to males but included both nesting and non-nesting individuals to evaluate the cardiovascular performance of fish during parental care. Resting values for cardiac output ( ) and heart rate ( f H ) tended to be higher for nesting fish when adjusted for variation in temperature. Both...
Includes: Supplementary data
Journal Articles
J Exp Biol (2010) 213 (5): 808–819.
Published: 1 March 2010
... measured metabolic variables [routine oxygen consumption ( ), maximum , metabolic scope] and cardiac function (cardiac output, ; heart rate, f H ; and stroke volume, V S ) in these fish during critical swimming speed ( U crit ) tests performed at both levels of water oxygenation. Although surgery (flow...
Journal Articles
J Exp Biol (2010) 213 (1): 78–88.
Published: 1 January 2010
... artery and hepatic portal vein, and to calculate cardiac output, heart rate and stroke volume. Fasted pythons while crawling experienced a 2.7- and 3.3-fold increase, respectively, in heart rate and cardiac output, and a 66% decrease in superior mesenteric flow. During the digestion of a rodent meal...
Journal Articles
J Exp Biol (2009) 212 (23): 3771–3780.
Published: 1 December 2009
... T crit the temperature at which a fish has no aerobic scope T opt the temperature at which a fish has maximum aerobic scope rate of oxygen uptake References Barron M. G. , Tarr B. D. , Hayton W. L. ( 1987 ). Temperature-dependence of cardiac output...
Journal Articles
J Exp Biol (2008) 211 (24): 3915–3926.
Published: 15 December 2008
... and recovering sockeye salmon while water temperature was acutely increased from 15°C to 24°C in 2°C h –1 increments. Fish swam at a constant speed during the temperature change. By simultaneously measuring oxygen consumption( Ṁ O 2 ), cardiac output ( Q̇ ) and the blood oxygen status of arterial and venous...
Journal Articles
J Exp Biol (2007) 210 (17): 3068–3074.
Published: 1 September 2007
.... This study examined the thermal plasticity of cardiac function in P. borchgrevinki to determine whether specialisation to stable low temperatures has led to the loss of the ability to acclimate physiological function. Fish were acclimated to–1°C and 4°C for 4–5 weeks and cardiac output was measured at rest...