6. Conclusions
This is the first study to find that PT possibly can affect fascial structures, which may provide some reference for PT users (therapists, general population). The results show that 15 min of 30 Hz PT did not reduce the TLF thickness in healthy adult males but decreased the echo intensity in the TLF region, probably due to a reduction in the viscosity of hyaluronic acid between the loose connective tissue. PT performed on the back alone did not facilitate lumbar flexibility but increased skin temperature and improved perceived stiffness. Therefore, it is recommended that PT be used to improve and prevent TLF densification in the healthy population.