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Fig. 9. The relationship between extracellular Ca2+ and contractile
force. Twitch force is expressed as a percentage of the difference between
maximum force development and baseline force at 1.5 mmol l-1
Ca2+ for (A) male and female ventricle strips receiving 5 mmol
l-1 glucose; (B) female ventricle strips, glucose vs
glucose-free and (C) male ventricle strips, glucose vs glucose-free.
In the presence of glucose, the EC50 for Ca2+-dependent
force production was lower in females than males (P<0.01).
Compared with tissue receiving glucose, glucose-free ventricle strips from
both sexes were less sensitive to Ca2+ (P<0.05) but sex
differences were not evident. Values are means ± s.e.m. (N=8-9
strips per curve).