Methods: In this experimental, noncontrolled, nonrandomized study, IVP was obtained through a perineometer introduced into the volunteers' vagina while in dorsal horizontal decubitus. Forty young, healthy university volunteer women with no history of vaginal delivery participated. All voluntary contractions of the perineal muscles were measured in 3 different ways: phasic perineal contraction (PPC), tonic perineal contraction, and perineal contraction associated to accessory muscles. New pressure measurements were obtained immediately after the HVLA manipulation on the volunteers' sacrum. The pressures were registered and transcribed directly to a personal computer with specific software.
Results: The average IVPs obtained in millimeters of mercury before and after the HVLA manipulation were 56.01 (±25.54) and 64.65 (±25.63) for PPC, 445.90 (±186.84) and 483.14 (±175.29) for tonic perineal contraction, and 65.62 (±26.56) and 69.37 (±25.26) for perineal contraction associated to accessory muscles, respectively. There was significant statistical variation only for PPC (P = .0020) values. The BPT increased regardless of the type of contraction (P < .05).
Conclusion: High-velocity and low-amplitude manipulation of the sacrum was associated with an increase of PPC and of BPT in women who had no associated osteoarticular diseases. These preliminary discoveries could be helpful in the future study of the treatment of women with perineal hypotony.
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