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Fig. 5. The rates of contraction and relaxation of the heartbeat depend on
temperature. (A) Tension recordings averaged over 12 successive heartbeats
show the shape of the heartbeat at the indicated temperatures. The inset shows
heartbeats at 2°C and 22°C normalized to the maximal amplitude of the
heartbeat. (B) Phase plots of the rate of change of force (y-axis) as
a function of the force of contraction (x-axis) of the heartbeat.
Plots represent all heartbeats recorded during 1 min at each indicated
temperature. (C) Rates of contraction and of relaxation measured as the mean
(±s.d.) of the maximum rising and falling slopes
(dF/dt) of the heartbeat at indicated temperatures. (D)
Acute Q10 values for the contraction and relaxation of the
heartbeat calculated from the change in dF/dt as a function
of temperature (see Materials and methods). (E) Phase plots of B normalized
for contraction amplitude at each temperature. (F) Rates of contraction and
relaxation from C normalized for contraction amplitude at each temperature.
(G) Acute Q10 values calculated from normalized data in F. All data
are from a single isolated heart.
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