Search Results - "SYME, Douglas A"

Enhancement of muscle and locomotor performance by a series compliance: A mechanistic simulation study by Robertson, Jason W, Struthers, Colin N, Syme, Douglas A

“…The objective was to better understand how a series compliance alters contraction kinetics and power output of muscle to enhance the work done on a load. A…”
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Controlled Chaos: Three-Dimensional Kinematics, Fiber Histochemistry, and Muscle Contractile Dynamics of Autotomized Lizard Tails by Higham, Timothy E., Lipsett, Kathryn R., Syme, Douglas A., Russell, Anthony P.

“…The ability to shed an appendage occurs in both vertebrates and invertebrates, often as a tactic to avoid predation. The tails of lizards, unlike most…”
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Temperature effects on the contractile performance and efficiency of oxidative muscle from a eurythermal versus a stenothermal salmonid by Gamperl, A Kurt, Syme, Douglas A

“…We compared the thermal sensitivity of oxidative muscle function between the eurythermal Atlantic salmon (Salmo salar) and the more stenothermal Arctic char…”
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Stretch-induced, steady-state force enhancement in single skeletal muscle fibers exceeds the isometric force at optimum fiber length by Rassier, Dilson E., Herzog, Walter, Wakeling, Jennifer, Syme, Douglas A.

“…Stretch-induced force enhancement has been observed in a variety of muscle preparations and on structural levels ranging from single fibers to in vivo human…”
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Effects of hypoxic acclimation, muscle strain, and contraction frequency on nitric oxide-mediated myocardial performance in steelhead trout ( Oncorhynchus mykiss ) by Carnevale, Christian, Syme, Douglas A, Gamperl, A Kurt

“…Whether hypoxic acclimation influences nitric oxide (NO)-mediated control of fish cardiac function is not known. Thus, we measured the function/performance of…”
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Can temperature-dependent changes in myocardial contractility explain why fish only increase heart rate when exposed to acute warming? by Gamperl, A Kurt, Thomas, Alexander L, Syme, Douglas A

“…Fish increase heart rate (fH), not stroke volume (VS), when acutely warmed as a way to increase cardiac output (Q). To assess whether aspects of myocardial…”
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The ocellate river stingray (Potamotrygon motoro) exploits vortices of sediment to bury into the substrate by Seamone, Scott G., Syme, Douglas A.

“…Particle image velocimetry and video analysis were employed to determine the pectoral‐fin mechanism used by the stingray Potamotrygon motoro to bury into sand…”
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Growing out of the fins: Implications of isometric and allometric scaling of morphology relative to increasing mass in blue sharks (Prionace glauca) by Seamone, Scott G., Sternes, Phillip C., McCaffrey, Theresa M., Tsao, Natalie K., Syme, Douglas A.

“…Disproportional changes (i.e. allometry) in shark morphology relative to increasing body size have been attributed to shifts in function associated with niche…”
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Effects of hypoxic acclimation on contractile properties of the spongy and compact ventricular myocardium of steelhead trout (Oncorhynchus mykiss) by Roberts, Jordan C., Carnevale, Christian, Gamperl, A. Kurt, Syme, Douglas A.

“…The trout ventricle has an outer compact layer supplied with well-oxygenated arterial blood from the coronary circulation, and an inner spongy myocardium…”
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Power Isn’t Everything: Muscle Function and Energetic Costs during Steady Swimming in Atlantic Cod (Gadus morhua) by Syme, Douglas A., Gollock, Matt, Freeman, Marcus J., Gamperl, A. Kurt

“…Power produced by red myotomal muscles of fish during cruise swimming appears seldom maximized, so we sought to investigate whether economy may impact or…”
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Effects of epinephrine exposure on contractile performance of compact and spongy myocardium from rainbow trout (Oncorhynchus mykiss) during hypoxia by Roberts, Jordan C., Syme, Douglas A.

“…Hypoxia results in elevated circulating epinephrine for many fish species, and this is likely important for maintaining cardiac function. The aims of this…”
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Thermal effects on red muscle contractile performance in deep-diving, large-bodied fishes by Stoehr, Ashley A., Donley, Jeanine M., Aalbers, Scott A., Syme, Douglas A., Sepulveda, Chugey, Bernal, Diego

“…Bigeye thresher sharks ( Alopias superciliosus ) and swordfish ( Xiphias gladius ) are large, pelagic fishes, which make long-duration, diurnal foraging dives…”
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Trading Force for Speed: Why Superfast Crossbridge Kinetics Leads to Superlow Forces by Rome, Lawrence C., Cook, Chris, Syme, Douglas A., Connaughton, Martin A., Ashley-Ross, Miriam, Klimov, Andrei, Tikunov, Boris, Goldman, Yale E.

“…Superfast muscles power high-frequency motions such as sound production and visual tracking. As a class, these muscles also generate low forces. Using the…”
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Red muscle function in stiff-bodied swimmers: there and almost back again by Syme, Douglas A., Shadwick, Robert E.

“…Fishes with internalized and endothermic red muscles (i.e. tunas and lamnid sharks) are known for a stiff-bodied form of undulatory swimming, based on unique…”
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Increased ventricular stiffness and decreased cardiac function in Atlantic cod (Gadus morhua) at high temperatures by Syme, Douglas A, Gamperl, A Kurt, Nash, Gordon W, Rodnick, Kenneth J

“…We employed the work loop method to study the ability of ventricular and atrial trabeculae from Atlantic cod to sustain power production during repeated…”
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Effects of Using Tricaine Methanesulfonate and Metomidate before Euthanasia on the Contractile Properties of Rainbow Trout (Oncorhynchus mykiss) Myocardium by Roberts, Jordan C, Syme, Douglas A

“…Because many anesthetics work through depressing cell excitability, unanesthetized euthanasia has become common for research involving excitable tissues (for…”
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Thunniform swimming: muscle dynamics and mechanical power production of aerobic fibres in yellowfin tuna (Thunnus albacares) by Shadwick, Robert E, Syme, Douglas A

“…We studied the mechanical properties of deep red aerobic muscle of yellowfin tuna (Thunnus albacares), using both in vivo and in vitro methods. In fish…”
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Temperature and sex dependent effects on cardiac mitochondrial metabolism in Atlantic cod (Gadus morhua L.) by Rodnick, Kenneth J., Gamperl, A. Kurt, Nash, Gordon W., Syme, Douglas A.

“…To test the hypothesis that impaired mitochondrial respiration limits cardiac performance at warm temperatures, and examine if any effect(s) are sex-related,…”
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Echocardiography and electrocardiography reveal differences in cardiac hemodynamics, electrical characteristics, and thermal sensitivity between northern pike, rainbow trout, and white sturgeon by Ma, Kathleen G. L., Gamperl, A. Kurt, Syme, Douglas A., Weber, Lynn P., Rodnick, Kenneth J.

“…Doppler and B‐mode ultrasonography and electrocardiography (ECG) were used to determine cardiac hemodynamics and electrical characteristics in 12°C‐acclimated…”
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Locomotor trade-offs in mice selectively bred for high voluntary wheel running by Dlugosz, Elizabeth M, Chappell, Mark A, McGillivray, David G, Syme, Douglas A, Garland, Jr, Theodore

“…We investigated sprint performance and running economy of a unique ;mini-muscle' phenotype that evolved in response to selection for high voluntary wheel…”
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