Naoki Tanaka
| Faculty of Health Care and Medical Sports,Department of Rehabilitation,Physical Therapy Major | Associate Professor |
| Graduate School of Health Sciences,Master's and Doctoral Programs in Physical Therapy | Associate Professor |
Last Updated :2026/03/31
■Researcher basic information
■Career
Career
■Research activity information
Paper
- Effect of Hip Training on One-Leg Jump Landing Motion of Female High School Basketball Players
Ruka AKIYOSHI Masumi YOSHIMOTO Naoki TANAKA Toru KUBOKAWA
Rigakuryoho Kagaku, 2024, [Reviewed] - Effectiveness of warm-up and dynamic balance training in preventing anterior cruciate ligament injuries in college gymnasts: a 3-year prospective study for one team.
Yuki Muramoto; Wtataru Iwamoto; Syota Iida; Kaoru Sasagawa; Hiroyuki Kobayashi; Shigemitsu Ishibuchi; Junichi Murakami; Yuko Maehara; Naoki Tanaka; Koji Wagatsuma; Hironobu Kuruma
The Journal of sports medicine and physical fitness, 13 Dec. 2023, [Reviewed]
BACKGROUND: The effect of trunk stability and dynamic balance warm-up exercises on physical functional improvement remains unelucidated. This study examined whether exercises could prevent anterior cruciate ligament (ACL) injury and improve trunk muscle activation and dynamic balance in gymnasts. METHODS: This comparison study, involving gymnastics practice sessions, included 31 university gymnasts and was conducted in two periods: 1 year of observation followed by 2 years of intervention. Participants performed a trunk and dynamic balance warm-up exercise program during the intervention. The effect of exercise on the incidence of ACL injury was evaluated. In addition, the paired t-test was used to compare the Y-balance distance and the changes in muscle thickness associated with trunk muscle activation at rest and during plank. RESULTS: ACL injury risk during the intervention was significantly lower, with a relative risk of 0.23 (P=0.02, 95% CI: 0.06-0.88). Changes in muscle thickness with activation of the transversus abdominis (P<0.01, mean difference 4.1, 95% CI: 9.97-28.07, Cohen's d=0.52), internal oblique (P<0.01, mean difference 5.2, 95% CI: 9.72-21.55, Cohen's d=0.65), and external oblique (P<0.01, mean difference 5.5, 95% CI: 20.44-39.09, Cohen's d=0.71) muscles were significantly higher during the intervention. The Y-balance distance was also significantly greater in the posterior medial reach (P<0.01, mean difference 3.3, 95% CI: 1.56-6.26, Cohen's d=0.46) during the intervention. CONCLUSIONS: Exercise-based warm-up programs may decrease ACL injuries. It can improve physical functions, such as the rate of change in trunk muscle thickness and the posterior medial distance during Y balance. - Throwing kinematics and elbow varus torque relative to ball size in junior baseball players.
Naoki Tanaka; Yasutomo Sakai; Yosuke Maruyama; Tetsuro Hirayama; Wataru Iwamoto; Koji Wagatsuma
Journal of physical therapy science, Jan. 2022, [Reviewed]
[Purpose] The purpose of this study was to investigate changes in the shoulder and elbow joint angles, upper limb angular velocities, and elbow varus torque when throwing balls of two different sizes. [Participants and Methods] The pitching motion of 26 junior baseball players was analyzed using an optical motion capture system. The balls used were a standard baseball and a small ball of equal weight. Shoulder external rotation/abduction and elbow flexion were measured. The maximum values of shoulder joint internal rotation, elbow joint extension, wrist flexion angular velocity, and elbow joint varus torque were also evaluated. The ball velocity was determined as an index of pitching performance. [Results] The shoulder external rotation and elbow flexion angles were higher when pitching with a small ball. The joint angular velocity was also significantly higher when pitching with a small ball for all items examined. The ball speed was significantly higher with the small ball. The maximum varus torque of the elbow joint divided by the ball velocity was significantly lower for the small ball. [Conclusion] For a junior baseball player with a small hand length, using a small ball enables pitching with low stress on the elbow joint. - Influence of pitching grip on shoulder and elbow injuries in junior baseball players, focusing on hand length and the metacarpophalangeal joint angle.
Naoki Tanaka; Yasutomo Sakai; Wataru Iwamoto; Koji Wagatsuma
Journal of physical therapy science, Sep. 2021, [Reviewed]
[Purpose] We investigated the relationship of pitching grip with hand length and index finger metacarpophalangeal joint angle. [Participants and Methods] A total of 650 junior baseball players divided into two groups according to whether they experienced shoulder or elbow pain were divided into two groups based on their pitching grip, i.e., those who held the ball with the ulnar side of the thumb and those who held it with the finger pad of the thumb. The metacarpophalangeal joint angle was measured while the participants held a ball. [Results] The average hand length was 16.3 ± 1.4 cm for those holding the ball with the ulnar side of the thumb and 15.8 ± 1.2 cm for those holding it with the finger pad of the thumb. Hand length and metacarpophalangeal angle were significantly greater in the group using the ulnar side of the thumb. The two groups showed no significant differences in the distribution of grip type or history of shoulder/elbow pain. The index finger metacarpophalangeal angle and shoulder/elbow pain were significantly lower in the pain group. [Conclusion] With respect to the pitching grip for junior baseball players, we recommend a slightly flexed rather than extended position with the metacarpophalangeal angle. - Muscle activity during bridge exercises on different types of floor surfaces
Jumpei Takahashi; Hiroto Suzuki; Naoki Tanaka; Toru Nishiyama
The Journal of Physical Fitness and Sports Medicine, 25 Jul. 2021, [Reviewed] - 肘頭窩を指標とした上腕三頭筋内側頭の筋厚測定方法における信頼性
Mar. 2019, [Reviewed] - 器械体操選手における体幹筋の筋厚変化率と下肢障害発生の関係 前向き研究
Mar. 2019, [Reviewed] - 超音波検査により肩峰骨端症の診断に至った一例
Mar. 2019, [Reviewed] - 投球障害を有する投手の握力及び手指ピンチ力の検討
Jun. 2006, [Reviewed]
MISC
Lectures, oral presentations, etc.
- バイオメカニクス研究の臨床への活かし方：上肢（肩関節を中心とした検討）
14 Sep. 2024 - 障害者野球における理学療法士としての支援
30 Jun. 2024 - 学童野球選手における圧痛と外反ストレス検査は肘内側部痛新規発生予測となり得るか
Oct. 2020 - 野球選手における投球側の可動域変化が学童期から生じるかの検討
Oct. 2020 - スポーツ分野における理学療法士の予防的な関わり
02 Feb. 2020 - 学童少年野球選手における肩関節内旋可動域制限の発生時期と投球数の関係
Nov. 2019 - 野球投手における棘下筋・三角筋の筋厚とその筋厚比の検討
Jul. 2019 - 学童野球選手におけるボールの握り方の特徴と肩肘障害の関係
Oct. 2017 - 学童野球選手の上腕骨小頭離断性骨軟骨炎と身体機能の関連因子の検討
Oct. 2017 - 腰痛を有する中学生サッカー選手の身体特性
Apr. 2017 - 手長と示指角度に着目した野球ボールの握り方と肘障害に関する検討
Apr. 2017 - 異なるベッド条件下におけるブリッジ動作時筋活動
Apr. 2017 - 中・高年期の野球選手における傷害調査
Oct. 2016 - 足関節内反捻挫反復群と非反復群の足関節内返し可動域について
Oct. 2016 - 学童少年野球選手における上腕骨小頭の離断性骨軟骨炎と全力投球数の関係について
Oct. 2016 - 中・高年期野球選手における肩関節痛と関節可動域の関係
Sep. 2016 - 当院における社会人女子サッカーチームに対するメディカルチェックについて
Oct. 2015 - 地域在住高齢者の身体活動量と生活のひろがりとの関係について
Apr. 2015 - 低速度歩行の運動学的動作分析
May 2013 - 体幹機能評価に与える因子の検討
Mar. 2010 - 鏡視下腱板修復術のリハビリ経過 PCAを導入して
Jul. 2006
Social Contribution Activities
■University education and qualification information
