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A) Averaged traces of force generated by constructs stimulated by 1 μm indentations at different frequencies and by spontaneously contracting constructs. (* denotes p < 0.05 compared to constructs stimulated by 2 Hz frequency). B) Time to peak, 20% relaxation, and 80% relaxation (relative to time to peak) for the average traces plotted in (A). (*denotes p < 0.05 compared to 1 and 0.5 Hz frequency, ** denotes p < 0.05 compared to AFM-stimulated constructs).
