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Figure 2 (A) Myocyte cross-sectional area (µm²) in adult, middle-aged and old rabbit hearts. Results of two-way analysis of variance: p < 0.01 for age; p = 0.75 for treatment; and p = 0.98 for age x treatment. (B) Percent collagen content in adult, middle-aged and old rabbit hearts. Results of two-way analysis of variance: p < 0.01 for age; p = 0.41 for treatment; and p = 0.97 for age x treatment. *p < 0.05 and p < 0.01 versus adult rabbits; p < 0.01 versus middle-aged rabbits. Solid bars = control groups; open bars = PC groups.