162 Table 6.3. Amplitude of contractions according to menstrual cycle phase Menstrual (n= 4) Mid follicular (n=11) Late Follicular (n= 26) Early Luteal (n=14) Late Luteal (n=15) pvalue* Standard deviation in strain longitudinal direction anterior (Mean, SD) 0.050 (0.015) 0.049 (0.010) 0.062 (0.016) 0.056 (0.013) 0.062 (0.024) 0.141 Standard deviation in strain longitudinal direction posterior (Mean, SD) 0.042 (0.006) 0.036 (0.010) 0.043 (0.012) 0.041 (0.014) 0.040 (0.014) 0.240 Standard deviation in strain radial direction anterior (Mean, SD) 0.041 (0.014) 0.038 (0.010) 0.045 (0.012) 0.047 (0.021) 0.038 (0.013) 0.266 Standard deviation in strain radial direction posterior (Mean, SD) 0.041 (0.011) 0.037 (0.010) 0.044 (0.011) 0.044 (0.023) 0.036 (0.013) 0.218 *One-way ANOVA Contraction Direction and Velocity: Contraction direction did not seem to differ significantly between menstrual phases (Table 6.4, p>0.05). During the menstrual phase, direction of contraction showed a trend towards F2C contractions. In other phases mainly C2F contractions were seen. Contraction velocity overall differed significantly across cycle phases. The velocity of contractions was significantly higher in the late follicular phase in all directions (see Table 6.5,p<0.001, p=0.021, 0.004 and 0.026 respectively), and lowest in the late luteal phase.
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