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Keywords: cardiac output
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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: 07 March 2019
... 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
... by The Company 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...
Journal Articles
J Exp Biol (2018) 221 (15): jeb183160.
Published: 13 August 2018
... cardiac output ( Q̇ ) for C. aceratus at ∼0°C was much lower (26.6 ml min −1 kg −1 ) than previously reported, probably because fish in the present study had a low f H (12 beats min −1 ) indicative of a high routine vagal tone and low stress. Chaenocephalus aceratus increased oxygen consumption during...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (22): 4186–4194.
Published: 15 November 2017
.... Altitude Ventilation Cardiac output Metabolism Goose Duck Hypoxia (low environmental oxygen) at high altitude is challenging to vertebrate life, and is believed to have driven adaptations that improve oxygen transport in high-altitude species. Two high-altitude populations that have received...
Journal Articles
J Exp Biol (2017) 220 (14): 2589–2597.
Published: 15 July 2017
... flows 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, there was a...
Journal Articles
J Exp Biol (2016) 219 (13): 1974–1984.
Published: 01 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...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (3): 457–463.
Published: 01 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: 01 May 2011
... of drugs to the surrounding media to obtain baseline (i.e. anaesthetized) values for heart rate, stroke volume and cardiac output. A 1μl sample of a 10 –1 mol l –1 solution of adrenaline, isoproterenol, procaterol or propranolol was added to the 1 ml of solution bathing the larva and gently mixed...
Journal Articles
J Exp Biol (2010) 213 (21): 3692–3698.
Published: 01 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...
Journal Articles
J Exp Biol (2010) 213 (13): 2332–2342.
Published: 01 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 of...
Includes: Supplementary data
Journal Articles
J Exp Biol (2010) 213 (5): 808–819.
Published: 01 March 2010
... subsequently 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...
Journal Articles
J Exp Biol (2010) 213 (1): 78–88.
Published: 01 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: 01 December 2009
... promise for scientists who wish to make predictions on how climate change may influence animal distributions. farrellt@interchange.ubc.ca 19 8 2009 © 2009. 2009 thermal niches optimal temperature aerobic scope oxygen uptake metabolic rate cardiac output heart rate tissue...
Journal Articles
J Exp Biol (2008) 211 (24): 3915–3926.
Published: 15 December 2008
... 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: 01 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...
Journal Articles
J Exp Biol (2007) 210 (7): 1216–1224.
Published: 01 April 2007
... arterial supply of oxygen to the compact layer of the ventricle. Using in situ perfused heart preparations, maximum cardiac performance of 18°C-acclimated sea bass (i.e. cardiac output=90.8±6.6 ml min –1 kg –1 and power output=11.41±0.83 mW g –1 ) was found to be comparable to that previously reported for...