Impact of RF PFR on Maximal Pelvic Muscle Contraction (UROstym Max) Similarly, when analyzing maximal pelvic floor contraction (UROstym max), there was no significant effect of time of measurement (Wilks’ lambda = 1.00, F (1, 45) = 0.12, P = 0.74), between-subjects effect ( F (1, 45) = 3.12, P = 0.08) (though nearing significance), or control variables (age, pregnancies).
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