Figure 2

The survival rate of spinal cord cells was dependent on the level, frequency and duration of the applied tensile strain. The survival rate (%) of living cells during the application of a standardized cyclic tensile stress (10%, 0.5 Hz) compared with stress-free baseline (A). Gray bar: stress-free condition; white bar: cyclic tensile stress condition. The survival rate (%) of living cells after 6 hours at three different strain levels of 5%, 10%, and 15% and two different strain frequencies of 0.5 Hz and 1 Hz compared with that at the standardized strain level of 10% at 0.5 Hz frequency (B). Data are expressed as mean ± SEM of 6 experiments. *P < 0.05, **P < 0.01.