This group carries out a 12-week training intervention based on Kegel exercises to improve strength and muscle activation

This group is used as a control group. They keep training their sports discipline but don't join the 12-week PFM training protocol.

The training program consisted of 12 weeks of PFM exercises, 3 times per week, with each session lasting between 10 and 15 minutes. The program followed different stages through the weeks: (1) proprioception of pelvic floor muscles activation and integration with diaphragmatic breathing, (2) stabilization and strengthening of the pelvic floor musculature through progressive overloading, and (3) transference of these exercises to FFT practice. During the 12 weeks, short contractions (2") were combined with longer ones (5 to 10"), carrying out the progressive overload by increasing the number of contractions, the duration of the contraction, or by evolving the execution position towards more upright postures and sporting movements.

Maximal, medium and minimal force generated of the pelvic floor muscles, measured with a vaginal dynamometer, which involves a pelvimeter probe with two arms that could be separated up to 25°, connected to the Phenix USB2 device (Pelvimètre Phenix, Vivaltis). The closed pelvimeter is inserted into the vagina with one arm positioned against the posterior side of the symphysis pubis. Once in place, to evaluate the contractile force of the PFM, the participant performes a pelvic floor contraction for 10 seconds against the arms of the probe fixed at 5º (an isometric contraction).

Measured as tone or initial inertia index (III) using a vaginal dynamometer, which involves a pelvimeter probe with two arms that could be separated up to 25°, connected to the Phenix USB2 device (Pelvimètre Phenix, Vivaltis). The closed pelvimeter is inserted into the vagina with one arm positioned against the posterior side of the symphysis pubis. Once in place, the probe is opened by 5° to measure basal muscle activation (initial inertia index) and shock absorption, which assesses the pelvic floor ability to withstand stress.

Measured with the International Consultation on Incontinence Questionnaire-short form (ICIQ-SF), which evaluates the frequency, severity and impact on quality of life (QoL) of urinary incontinence in men and women (in the female athletes in this case). It encompasses 4 items (frequency or urinary incontinence, amount of leakage, overall impact of urinary incontinence and self-diagnostic item) with a scoring scale of 0-21 reflecting the degree of urinary incontinence as slight (1-5), moderate (6-12), severe (13-18) and very severe (19-21).