May 2025
World Physiotherapy, Outstanding presentation award
The effects of mental practice on brain activity and hamstrings flexibility in healthy young men
Manabu Miyazaki, Shuhei Iida

Oct. 2022

Mar. 2021

Acute effects of resetting the stretching intensity on range of motion and passive stiffness in healthy adults: a randomized crossover trial
Taizan Fukaya; Shingo Matsuo; Manabu Miyazaki; Masahiro Iwata; Genki Hatano; Eiji Yamanaka; Wakako Tsuchida; Yuji Asai; Shigeyuki Suzuki
Journal of Bodywork and Movement Therapies, Apr. 2025, [Reviewed]

Acute and Prolonged Effects of 300 sec of Static, Dynamic, and Combined Stretching on Flexibility and Muscle Force.
Matsuo S; Iwata M; Miyazaki M; Fukaya T; Yamanaka E; Nagata K; Tsuchida W; Asai Y; Suzuki S
Journal of sports science & medicine, 01 Dec. 2023, [Reviewed]
Static stretching (SS), dynamic stretching (DS), and combined stretching (CS; i.e., DS+SS) are commonly performed as warm-up exercises. However, the stretching method with the greatest effect on flexibility and performance remains unclear. This randomized crossover trial examined acute and prolonged effects of SS, DS, and CS on range of motion (ROM), peak passive torque (PPT), passive stiffness, and isometric and concentric muscle forces. Twenty healthy young men performed 300 sec of active SS, DS, or CS (150-sec SS followed by 150-sec DS and 150-sec DS followed by 150-sec SS) of the right knee flexors on four separate days, in random order. Subsequently, we measured ROM, PPT, and passive stiffness during passive knee extension. We also measured maximum voluntary isometric and concentric knee flexion forces and surface electromyographic activities during force measurements immediately before, immediately after, and 20 and 60 min after stretching. All stretching methods significantly increased ROM and PPT, while significantly decreasing isometric knee flexion force (all p < 0.05). These changes lasted 60 min after all stretching methods; the increases in ROM and PPT and the decreases in isometric muscle force were similar. All stretching methods also significantly decreased passive stiffness immediately after stretching (all p < 0.05). Decreases in passive stiffness tended to be longer after CS than after SS or DS. Concentric muscle force was decreased after SS and CS (all p < 0.05). On the other hand, concentric muscle force was unchanged after DS, while the decreases in surface electromyographic activities during concentric force measurements after all stretching methods were similar. Our results suggest that 300 sec of SS, DS, and CS have different acute and prolonged effects on flexibility and muscle force.

Effects of static stretching with short duration and high intensity on flexibility　　　　　　　　　　　　　　　
Apr. 2022, [Reviewed]

Effects of Menstrual Cycle on Flexibility and Muscle Performance in Healthy Young Women
Miyazaki Manabu
Mar. 2022

Changes in hamstring flexibility and muscle strength during the menstrual cycle in healthy young females.
Miyazaki M; Maeda S
Journal of physical therapy science, 23 Feb. 2022, [Reviewed]
[Purpose] The purpose of this study was to elucidate changes in flexibility and muscle strength during the menstrual cycle in detail and to investigate the relationship between flexibility and muscle strength. [Participants and Methods] Sixteen healthy young female and eight male participants were measured during the follicular, ovulation and luteal phases. Range of motion, passive torque at the onset of pain, passive stiffness and muscle strength were measured using an isokinetic dynamometer. Additionally, electromyography was measured during muscle strength measurement. [Results] In the female group, range of motion and passive torque at the onset of pain were significantly increased during the ovulatory and luteal phases compared with the follicular phase. Passive stiffness decreased significantly during the ovulatory phase compared with the follicular phase. Isometric muscle force and electromyographic activity were significantly increased during the luteal phase compared with the ovulation phase. There was no correlation between stiffness and muscle strength. However, there was a positive correlation between electromyographic activity and muscle strength. [Conclusion] Our findings suggest that changes in flexibility during the ovulatory and luteal phases are influenced by fluctuations in sex hormones. However, the changes in muscle strength showed little relation to flexibility, suggesting the involvement of neural mechanisms.

Effects of Menstrual Cycle on Flexibility of the Hamstrings in Healthy Young Women
Miyazaki M.; Maeda S.
Advances in Exercise and Sports Physiology 27 (3) 37-43, 2021., Nov. 2021, [Reviewed]

Changes in Flexibility and Force are not Different after Static Versus Dynamic Stretching.
Shingo Matsuo; Masahiro Iwata; Manabu Miyazaki; Taizan Fukaya; Eiji Yamanaka; Kentaro Nagata; Wakako Tsuchida; Yuji Asai; Shigeyuki Suzuki
Sports medicine international open, Dec. 2019, [Reviewed]
In this study, we examined the effects of static and dynamic stretching on range of motion (ROM), passive torque (PT) at pain onset, passive stiffness, and isometric muscle force. We conducted a randomized crossover trial in which 16 healthy young men performed a total of 300 s of active static or dynamic stretching of the right knee flexors on two separate days in random order. To assess the effects of stretching, we measured the ROM, PT at pain onset, passive stiffness during passive knee extension, and maximum voluntary isometric knee flexion force using an isokinetic dynamometer immediately before and after stretching. Both static and dynamic stretching significantly increased the ROM and PT at pain onset (p<0.01) and significantly decreased the passive stiffness and isometric knee flexion force immediately after stretching (p<0.01). However, the magnitude of change did not differ between the two stretching methods for any measurements. Our results suggest that 300 s of either static or dynamic stretching can increase flexibility and decrease isometric muscle force; however, the effects of stretching do not appear to differ between the two stretching methods.

Dynamic Stretching Has Sustained Effects on Range of Motion and Passive Stiffness of the Hamstring Muscles.
Masahiro Iwata; Ayano Yamamoto; Shingo Matsuo; Genki Hatano; Manabu Miyazaki; Taizan Fukaya; Mitsuhiro Fujiwara; Yuji Asai; Shigeyuki Suzuki
Journal of sports science & medicine, Mar. 2019, [Reviewed]
Dynamic stretching (DS) is often performed during warm-up to help avoid hamstring muscle injuries, increase joint flexibility, and optimize performance. We examined the effects of DS of the hamstring muscles on passive knee extension range of motion (ROM), passive torque (PT) at the onset of pain (as a measure of stretch tolerance), and passive stiffness of the muscle-tendon unit over an extended period after stretching. Twenty-four healthy subjects participated, with 12 each in the experimental and control groups. Stretching was performed, and measurements were recorded using an isokinetic dynamometer pre-intervention, and at 0, 15, 30, 45, 60, 75, and 90 min post-intervention. DS consisted of ten 30-s sets of 15 repetitions of extension and relaxation of the hamstrings. ROM increased significantly (range, 7%-10%) immediately after DS, and the increase was sustained over 90 min. PT at the onset of pain also increased immediately by 10% but returned to baseline by 30 min. Passive stiffness decreased significantly (range, 7.9%-16.7%) immediately after DS, and the decrease was sustained over 90 min. Post-DS values were normalized to pre-DS values for the respective outcomes in both groups. ROM was significantly higher (range, 7.4%-10%) and passive stiffness was significantly lower (range, 5.4%-14.9%) in the experimental group relative to the control group at all time points. Normalized PT values at the onset of pain were significantly higher in the experimental group at 0-15 min than in the controls, but the differences were smaller at 30-45 min and not significant thereafter. We conclude that DS increases ROM and decreases passive stiffness in a sustained manner, and increases PT at the onset of pain for a shorter period. Overall, our results indicate that when performed prior to exercise, DS is beneficial for the hamstring muscles in terms of increasing flexibility and reducing stiffness.

HALを用いた介入効果について
2017

頸髄症を合併したアテトーゼ型脳性麻痺症例に対するHALでの歩行練習の短期介入効果
2016

プレコンディショニングとしての温熱刺激が高強度スタティック・ストレッチングに与える影響　　　　　　　　　　　　　　　
Mar. 2015

1ページ講座 理学療法関連用語 正しい意味がわかりますか? ストレッチング
Nov. 2019

伸張性収縮後の筋に対しスタティック・ストレッチングが柔軟性に与える影響
Feb. 2018

長期的なスタティック・ストレッチングが柔軟性・筋力に与える影響
2018

HALを用いた介入効果について システマティックレビューによる検討　　　　　　　　　　　　　　　
Apr. 2017

脊髄空洞症を呈した症例へのロボットスーツHALを用いたトレーニング効果
2017

デュシェンヌ型筋ジストロフィー患者へのゼリー食調整食品による服薬の実施　　　　　　　　　　　　　　　
Oct. 2016

頸髄症を合併したアテトーゼ型脳性麻痺症例に対するHALでの歩行練習の短期介入効果　　　　　　　　　　　　　　　
Oct. 2016

静的ストレッチングと筋収縮の繰り返しがROM、stiffness、最大動的トルクに及ぼす影響　　　　　　　　　　　　　　　
Oct. 2016

原因不明の痙性対麻痺症例に対するロボットスーツHALを用いた歩行トレーニングの即時効果の検証　　　　　　　　　　　　　　　
Jun. 2016

静的ストレッチングと筋収縮の繰り返しがROM，stiffness，最大動的トルクに及ぼす影響
2016

ダイナミック・ストレッチングが柔軟性に及ぼす即時的効果と効果持続時間について　　　　　　　　　　　　　　　
Dec. 2015

静的ストレッチングにおける伸張角度の再設定が柔軟性に及ぼす影響　　　　　　　　　　　　　　　
Apr. 2015

プレコンディションニングとしての温熱刺激が高強度スタティック・ストレッチングに与える影響について　　　　　　　　　　　　　　　
Apr. 2015

ハムストリングスの柔軟性に対するダイナミック・ストレッチングの急性効果　　　　　　　　　　　　　　　
Apr. 2015

ハムストリングスの柔軟性に対するホットパックの即時的効果と効果持続時間について
Mar. 2015

プレコンディションニングとしての温熱刺激が高強度スタティック・ストレッチングに与える影響について
2015

静的ストレッチングにおける伸張角度の再設定が柔軟性に及ぼす影響
2015

ハムストリングスの柔軟性に対するダイナミック・ストレッチングの急性効果
2015

静的ストレッチングの柔軟性改善効果は伸張強度が高いほど大きい
2014

ハンドヘルドダイナモメーターを用いた肩関節筋力測定の熟練度の影響 検者内、検者間の信頼性の検討
Apr. 2011

韓国ハンセン病快復者定着村における日韓合同ワークキャンプの取り組み
Dec. 2005

基礎から確認!PT臨床実習チェックリスト
Contributor
Mar. 2018
9784758319249

リハビリテーション義肢装具学
Contributor
Mar. 2017
9784758317221

Restless legs syndromeを発症した切迫流早産患者に対する理学療法の一例　　　　　　　　　　　　　　　
08 Oct. 2022

健常若年女性における月経周期が柔軟性に与える影響　　　　　　　　　　　　　　　
06 Mar. 2021

Current status and measures of leprosy in the world.　　　　　　　　　　　　　　　
Miyazaki Manabu
The 1st Academic agreement conclusion commemoration between Regis university and Teikyo Heisei university., 07 Jul. 2019

変形性膝関節症の病態と理学療法　　　　　　　　　　　　　　　
02 Feb. 2019, [Invited]

サルコペニアを予防するには？　　　　　　　　　　　　　　　
31 Jan. 2019, [Invited]

Effect of stretching intervention after a stretch contraction on delayed onset muscle soreness.　　　　　　　　　　　　　　　
17 Sep. 2018

月経周期が柔軟性・運動パフォーマンスに与える影響　　　　　　　　　　　　　　　
Sep. 2018

Sep. 2021 - Present
The society of Physical Therapy Science　　　　　　　　　　　　　　　

Dec. 2020 - Present
Japan Society of Health Promotion　　　　　　　　　　　　　　　

Apr. 2017 - Present
Japanese Society for Neural Repair and Neurorehabilitation　　　　　　　　　　　　　　　

Apr. 2015 - Present
東京都理学療法士協会　　　　　　　　　　　　　　　

Aug. 2013 - Present
Japanese Society of Physical Fitness and Sports Medicine　　　　　　　　　　　　　　　

Apr. 2007 - Present
World Physiotherapy　　　　　　　　　　　　　　　

Apr. 2007 - Present
Japanese Physical Therapy Association　　　　　　　　　　　　　　　

May 2005 - Present
ハンセン病市民学会　　　　　　　　　　　　　　　

Apr. 2013 - Mar. 2015
愛知県理学療法士協会　　　　　　　　　　　　　　　

Apr. 2007 - Mar. 2013
東京都理学療法士協会　　　　　　　　　　　　　　　

Effect of Menstrual Cycle on Flexibility and motor Performance
Grant-in-Aid for Early-Career Scientists
Teikyo Heisei University
Apr. 2018 - Mar. 2021
This study examined the variation in flexibility and motor performance during the menstrual cycle in healthy young women and its relationship to the menstrual cycle, and the following findings were made.
(1) ROM increased during the ovulatory and luteal phases compared to the follicular phase, respectively. There was no significant difference in anterior tibial translation in each phase, indicating that fluctuations in joint laxity during the menstrual cycle were smaller than those in muscle flexibility. (2) Maximal voluntary isometric muscle strength, muscle activity, and jumping performance increased during the luteal phase compared to the ovulatory phase. (3) Stiffness decreased during the ovulatory phase compared to the follicular phase. In contrast, isometric muscle strength did not change. Muscle strength fluctuations during the menstrual cycle were not correlated with fluctuations in muscle hardness, but were positively correlated with muscle activity.