Relationship between Muscle Stiffness Measured by the Muscle Hardness Meter and Passive Torque or Myotendinous Junction Displacement

Nakamura, Masatoshi; Ikezoe, Tome; Takeno, Yohei; Otsuka, Naoki; Ichihashi, Noriaki

doi:10.1298/jjpta.vol17_018

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“…However, these methods require expensive devices, such as an isometric dynamometer and ultrasonography; additionally, passive torque is generally used only as a parameter of limited joint movement. Nakamura 29 ) reported that significant positive correlations were observed between muscle hardness and passive torque or displacement of the myotendinous junction and suggested that muscle hardness when measured by a muscle hardness meter is both an accurate index and an easy-to-use method. In our study, a muscle hardness meter was used to assess the changes in muscle hardness while maintaining the same SLR ROM before and after the intervention.…”

Section: Discussionmentioning

confidence: 99%

The combined effects of transcutaneous electrical nerve stimulation (TENS) and stretching on muscle hardness and pressure pain threshold

et al. 2016

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[Purpose] This study aimed to clarify the immediate effects of a combined transcutaneous electrical nerve stimulation and stretching protocol. [Subjects] Fifteen healthy young males volunteered to participate in this study. The inclusion criterion was a straight leg raising range of motion of less than 70 degrees. [Methods] Subjects performed two protocols: 1) stretching (S group) of the medial hamstrings, and 2) tanscutaneous electrical nerve stimulation (100 Hz) with stretching (TS group). The TS group included a 20-minute electrical stimulation period followed by 10 minutes of stretching. The S group performed 10 minutes of stretching. Muscle hardness, pressure pain threshold, and straight leg raising range of motion were analyzed to evaluate the effects. The data were collected before transcutaneous electrical nerve stimulation (T1), before stretching (T2), immediately after stretching (T3), and 10 minutes after stretching (T4). [Results] Combined transcutaneous electrical nerve stimulation and stretching had significantly beneficial effects on muscle hardness, pressure pain threshold, and straight leg raising range of motion at T2, T3, and T4 compared with T1. [Conclusion] These results support the belief that transcutaneous electrical nerve stimulation combined with stretching is effective in reducing pain and decreasing muscle hardness, thus increasing range of motion.

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Section: Discussionmentioning

confidence: 99%