Heat production and oxygen consumption following contraction of isolated rabbit papillary muscle at 20 °C

1987 ◽  
pp. 85-92
Author(s):  
F. Mast ◽  
G. Elzinga
Keyword(s):  
Oxygen Consumption ◽  
Papillary Muscle ◽  
Heat Production ◽  
Rabbit Papillary Muscle

Analysis of thermopile records from contracting isolated cardiac muscle

1990 ◽  
Vol 259 (5) ◽  
pp. H1601-H1605 ◽  
Author(s):  
F. Mast ◽  
R. C. Woledge ◽  
G. Elzinga
Keyword(s):  
Steady State ◽  
Cardiac Muscle ◽  
Time Constant ◽  
Papillary Muscle ◽  
Heat Production ◽  
Heart Muscle ◽  
Stimulus Frequency ◽  
Recovery Process ◽  
Total Heat ◽  
Rabbit Papillary Muscle

Recovery heat production after contraction in rabbit papillary muscle at 20 degrees C occurs at an exponentially declining rate. The time constant describing this decline is 25 s; it is not different when 10 twitches or when a steady-state twitch train is studied, and it is unaltered by changing stimulus frequency from 0.125 to 0.2 Hz. The same value has previously been found after single twitches. If it is assumed that phosphocreatine (PCr) resynthesis is the cause of recovery heat production and that it occurs also during contractions at a rate proportional to the amount of PCr depletion, it is possible to divide the total heat production for any period of stimulation into that caused by this recovery process (R) and that caused by initial (I) processes (presumed to be PCr splitting). The value of R/I obtained by using this method is 1.10 +/- 0.04 (means +/- SE, n = 27 muscles), close to the theoretical value of 1.13. The correspondence between the measured and the predicted ratio supports the assumptions underlying the measurement. Thus in heart muscle the heat produced during and after contraction can be explained by PCr splitting and reformation. The older Bugnard method of analysis applied to the same data gives an R/I value of 1.5; the reasons for the discrepancy are described.

scholarly journals No major thermogenic role for (Na+ + K+)-dependent adenosine triphosphatase apparent in hepatocytes from hyperthyroid rats

1982 ◽  
Vol 202 (3) ◽  
pp. 661-665 ◽  
Author(s):  
D G Clark ◽  
M Brinkman ◽  
O H Filsell ◽  
S J Lewis ◽  
M N Berry
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Uptake ◽  
Atpase Activity ◽  
Heat Production ◽  
Adenosine Triphosphatase ◽  
Heat Output ◽  
Liver Parenchymal ◽  
Dependent Atpase ◽  
Parenchymal Cells ◽  
Isolated Liver

(Na+ + K+)-dependent ATPase activity, heat production and oxygen consumption were increased by 59%, 62% and 75% respectively in hepatocytes from tri-iodothyronine-treated rats. Ouabain at concentrations of 1 and 10 mM decreased oxygen uptake by 2-8% in hepatocytes from euthyroid rats and by 5-15% in hepatocytes from hyperthyroid animals. Heat output was decreased by 4-9% with the glycoside in isolated liver parenchymal cells from the control animals and by 11% in the cells from the tri-iodothyronine-treated animals. These results do not support the hypothesis that hepatic (Na+ + K+)-ATPase plays a major role in increased heat production in hepatocytes from hyperthyroid rats.

The Development of Subsarcolemmal Sodium Gradients in Ischaemic Rabbit Papillary Muscle Measured by X-Ray Microanalysis

2007 ◽  
Vol 13 (S02) ◽  
Author(s):  
A Warley ◽  
G Rogers ◽  
J Miller ◽  
M Shattock ◽  
D Chambers
Keyword(s):  
Papillary Muscle ◽  
X Ray ◽  
Rabbit Papillary Muscle

scholarly journals Electrical phenomenon in rabbit papillary muscle during Ba++-induced contracture.

1978 ◽  
Vol 54 (9) ◽  
pp. 565-568
Author(s):  
Yasutake SAEKI ◽  
Kouichi SHIOZAWA ◽  
Keiji YANAGISAWA
Keyword(s):  
Papillary Muscle ◽  
Rabbit Papillary Muscle ◽  
Electrical Phenomenon
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