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Contractile properties of cardiomyocytes isolated from young or old C57BL/6 and LID mouse hearts. (A) Resting cell length. (B) Peak shortening (PS, normalized to cell length). (C) Maximal velocity of shortening (+dL/dt). (D) Maximal velocity of relengthening (−dL/dt). (E) Time-to-peak shortening (TPS). (F) Time-to-90% relengthening (TR90); mean ± SEM, n = 160 cells/group, (*) p < 0.05 versus the C57BL/6 young group.
