Abstract:
CONTEXT:In clinical and sports settings, static stretching (SS) is usually performed to increase range of motion (ROM) and decrease passive muscle stiffness. Recently, the shear elastic modulus was measured by ultrasonic shear wave elastography as an index of muscle stiffness. Previous studies reported that the shear elastic modulus measured by ultrasound shear wave elastography decreased after SS, and the effects of SS on shear elastic modulus were likely affected by rest duration between sets of SS. OBJECTIVE:To investigate the acute effects of SS with different rest durations on ROM and shear elastic modulus of gastrocnemius and to clarify whether the rest duration between sets of SS decreases the shear elastic modulus. DESIGN:A randomized, repeated-measures experimental design. SETTING:University laboratory. PARTICIPANTS:Sixteen healthy males volunteered to participate in the study (age 21.3 [0.8] y; height 171.8 [5.1] cm; weight 63.1 [4.5] kg). MAIN OUTCOME MEASURES:Each participant underwent 3 different rest interval durations during SS (ie, long rest duration: 90 s; normal rest duration: 30 s; and short rest duration: 10 s). This SS technique was repeated 10 times, thus lasting a total of 300 seconds with different rest durations in each protocol. The dorsiflexion ROM and shear elastic modulus were measured before and after SS. RESULTS:Our results revealed that dorsiflexion ROM and shear elastic modulus were changed after 300-second SS; however, no effects of the rest duration between sets of SS were observed. CONCLUSIONS:In terms of decreasing the shear elastic modulus, clinicians and coaches should not focus on the rest duration when SS intervention is performed.
journal_name
J Sport Rehabiljournal_title
Journal of sport rehabilitationauthors
Nakamura M,Sato S,Kiyono R,Takahashi N,Yoshida Tdoi
10.1123/jsr.2018-0376subject
Has Abstractpub_date
2019-10-18 00:00:00pages
578-582issue
5eissn
1056-6716issn
1543-3072pii
jsr.2018-0376journal_volume
29pub_type
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