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Title: Effects of ankle position during static stretching for the hamstrings on the decrease in passive stiffness
Authors: Nakao, Sayaka
Ikezoe, Tome
Nakamura, Masatoshi
Saeki, Junya
Kato, Takehiro
Umehara, Jun
Ichihashi, Noriaki
Author's alias: 中尾, 彩佳
池添, 冬芽
中村, 雅俊/ 佐伯, 純弥
加藤, 丈博
梅原, 潤
市橋, 則明
Keywords: Stretching
Flexibility
Range of motion
Stiffness
Straight leg raise
Issue Date: 11-Nov-2019
Publisher: Elsevier BV
Journal title: Journal of biomechanics
Volume: 96
Thesis number: 109358
Abstract: Static stretching is frequently performed to improve flexibility of the hamstrings, although the ankle position during hamstring stretching has not been fully investigated. We investigated the effects of ankle position during hamstring stretching on the decrease in passive stiffness. Fourteen healthy men performed static stretching for the hamstrings with the ankle dorsiflexed and plantar-flexed in a randomized order on different days. The hip was passively flexed to the maximum angle which could be tolerated without stretch pain with the knee fully extended; this was maintained for 5 min, with 1-min stretching performed in 5 sessions. Final angles and passive stiffness were measured before and after stretching. The final angle was defined as that formed by the tibia and horizontal plane when the knee was passively extended from hip and knee angles at 90° flexion to the maximum extension angle which could be tolerated without stretch pain. Passive stiffness was determined by the slope of torque–angle curve during the measurement of the final angle. The final angle significantly increased after stretching with the ankle dorsiflexed and plantar-flexed, whereas passive stiffness significantly decreased only after stretching with the ankle planter-flexed. The results suggest that passive stiffness decreases after stretching with the ankle planter-flexed but not after stretching with the ankle dorsiflexed, although the range of joint motion increases regardless of the ankle position during 5-min stretching for the hamstrings. These results indicate that static stretching should be performed with the ankle plantar-flexed when aiming to decrease passive stiffness of the hamstrings.
Rights: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
The full-text file will be made open to the public on 11 November 2020 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. 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。
URI: http://hdl.handle.net/2433/253524
DOI(Published Version): 10.1016/j.jbiomech.2019.109358
PubMed ID: 31640847
Appears in Collections:Journal Articles

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