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Title: The effect of hip rotation on shear elastic modulus of the medial and lateral hamstrings during stretching.
Authors: Umegaki, Hiroki
Ikezoe, Tome  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-8546-5912 (unconfirmed)
Nakamura, Masatoshi
Nishishita, Satoru
Kobayashi, Takuya
Fujita, Kosuke
Tanaka, Hiroki
Ichihashi, Noriaki  kyouindb  KAKEN_id
Author's alias: 梅垣, 雄心
Keywords: Hamstrings
Ultrasonic shear wave elastography
Stretching
Hip rotation
Issue Date: Feb-2015
Publisher: Elsevier Ltd.
Journal title: Manual therapy
Volume: 20
Issue: 1
Start page: 134
End page: 137
Abstract: Regarding hamstring stretching methods, many studies have investigated the effect of stretching duration or frequency on muscle stiffness. However, the most effective stretching positions for hamstrings are unclear because it is impossible to quantify muscle elongation directly and noninvasively in vivo. Recently, a new ultrasound technology, ultrasonic shear wave elastography, has permitted noninvasive and reliable measurement of muscle shear elastic modulus, which has a strong linear relationship to the amount of muscle elongation. This study aimed to investigate the effect of hip internal and external rotation on shear elastic modulus of the lateral and medial hamstrings, respectively, during stretching in vivo using ultrasonic shear wave elastography. Twenty-three healthy men (age, 23.0 ± 2.1 years) were recruited for this study. To investigate the effect of hip rotation on the elongation of the medial and lateral hamstrings, shear elastic modulus of the biceps femoris (BF) and semitendinosus (ST) was measured at rest (a supine position with 90° knee flexion, 90° hip flexion, and hip neutral rotation) and in seven stretching positions (with 45° knee flexion and hip internal, external, and neutral rotation) using ultrasonic shear wave elastography. In both BF and ST, the shear elastic modulus in the rest position was significantly lower than that in all stretching positions. However, no significant differences were seen among stretching positions. Our results suggest that adding hip rotation at a stretching position for the hamstrings may not have a significant effect on muscle elongation of the medial and lateral hamstrings.
Rights: © 2014 Elsevier Ltd. NOTICE: this is the author's version of a work that was accepted for publication in Manual Therapy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Manual Therapy, 20_1 (2015), doi:10.1016/j.math.2014.07.016
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。This is not the published version. Please cite only the published version.
URI: http://hdl.handle.net/2433/196082
DOI(Published Version): 10.1016/j.math.2014.07.016
PubMed ID: 25194631
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