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Keywords: cardiac output
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Journal Articles
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
.... 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
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
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J Exp Biol (2011) 214 (9): 1445–1457.
Published: 1 May 2011
... and cardiac output of 4 d.p.f. zebrafish β-adrenergic receptor or control morphants before (MS-222) and after exposure to the adrenergic agonists adrenaline, isoproterenol and procaterol or the antagonist propranolol The mRNA expression of β 1AR was detectable as early as 1 h.p.f., had increased...
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...
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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...