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. 2015 Oct 8;5:14993. doi: 10.1038/srep14993

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(A) Beat frequency [Hz]; (B) Contraction force [pixel/s²]; (C) Contractility [pixel/s]; (D) Kinetic energy [pixel2/s²]. Horizontal bars represent the 95% confidence intervals for the differences between means according to the Least Significant Difference statistical test.