研究者詳細 - 国正　陽子

写真a

クニマサ　ヨウコ

国正　陽子

KUNIMASA Yoko

所属

教育研究院人文社会科学系教育学系列助教
工学部助教
教育学部保健体育・スポーツ科学講座助教
教育学部助教

ホームページ

https://yokokunimasa.wixsite.com/kunimasa-lab

外部リンク

学位

博士（スポーツ科学）（ 2017年3月大阪体育大学）

研究分野

ライフサイエンス / スポーツ科学 / 骨格筋・腱，生体イメージング
ライフサイエンス / スポーツ科学 / 神経筋機能

経歴（researchmap）

新潟大学人文社会科学系（教育学系列）助教

2022年7月 - 現在

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エクス＝マルセイユ大学 Institut des Sciences du Mouvement (ISM) 博士研究員

2021年2月 - 2022年6月

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大阪体育大学大学院スポーツ科学研究科助手

2017年10月 - 2021年1月

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大阪体育大学大学院スポーツ科学研究科博士研究員

2017年4月 - 2017年9月

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大阪体育大学大学院スポーツ科学研究科博士後期課程

2014年4月 - 2017年3月

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経歴

新潟大学教育学部保健体育・スポーツ科学講座助教

2022年7月 - 現在
新潟大学教育学部助教

2022年7月 - 現在
新潟大学工学部助教

2022年7月 - 現在
新潟大学教育研究院人文社会科学系教育学系列助教

2022年7月 - 現在

所属学協会

日本体力医学会

2009年9月

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European College of Sport Science

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日本バイオメカニクス学会

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日本トレーニング科学会

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日本体育学会

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委員歴

日本バイオメカニクス学会広報委員会委員

2023年10月 - 現在

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論文

Effect of a graded running race on lower limb muscle damage, jump performance and muscle soreness in men and women 査読

Robin Macchi, Yoko Kunimasa, Pascale Chavet, Baptiste Corcelle, Laura Pomportes, Camille Fazzari, Arnaud Hays, Fabrice Vercruyssen, Francesca Rossi, David Bendahan, Caroline Nicol

Scandinavian Journal of Medicine & Science in Sports 34 ( 5 ) 2024年5月

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掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley

Abstract

Purpose

Delayed structural and functional recovery after a 20 km graded running race was analyzed with respect to the sex effect.

Methods

Thirteen female and 14 male recreational runners completed the race and three test sessions: one before (PRE) and two after, once on Day 1 or 2 (D1‐2) and then on Day 3 or 4 (D3‐4). Muscle damage was assessed indirectly using ultrasonography to quantify changes in cross‐sectional area (CSA) of 10 lower‐limb muscles. Delayed onset of muscle soreness (DOMS) was assessed for three muscle groups. Functional recovery was quantified by kinetic analysis of a squat jump (SJ) and a drop jump (DJ) test performed on a sledge ergometer. Linear mixed models were used to assess control group reproducibility and recovery patterns according to sex.

Results

Regardless of sex, DOMS peaked at D1‐2 for all muscle groups and resolved at D3‐4. CSA was increased in each muscle group until D3‐4, especially in the semimembranosus muscle. A specific increase was found in the short head of the biceps femoris in women. Regardless of sex, SJ and DJ performances declined up to D3‐4. Depending on the muscle, positive and/or negative correlations were found between structural and functional changes. Some of these were sex‐specific.

Conclusion

Structural and functional recovery was incomplete in both sexes up to D3‐4, although DOMS had disappeared. More emphasis should be placed on hamstring muscle recovery. Highlighting the intermuscular compensations that can occur during multi‐joint testing tasks, the structural‐functional relationships were either positive or negative, muscle‐ and sex‐dependent.

DOI： 10.1111/sms.14643

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Muscle synergies inherent in simulated hypogravity running reveal flexible but not unconstrained locomotor control. 査読国際誌

Camille Fazzari, Robin Macchi, Yoko Kunimasa, Camélia Ressam, Rémy Casanova, Pascale Chavet, Caroline Nicol

Scientific reports 14 ( 1 ) 2707 - 2707 2024年2月

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記述言語：英語掲載種別：研究論文（学術雑誌）

With human space exploration back in the spotlight, recent studies have investigated the neuromuscular adjustments to simulated hypogravity running. They have examined the activity of individual muscles, whereas the central nervous system may rather activate groups of functionally related muscles, known as muscle synergies. To understand how locomotor control adjusts to simulated hypogravity, we examined the temporal (motor primitives) and spatial (motor modules) components of muscle synergies in participants running sequentially at 100%, 60%, and 100% body weight on a treadmill. Our results highlighted the paradoxical nature of simulated hypogravity running: The reduced mechanical constraints allowed for a more flexible locomotor control, which correlated with the degree of spatiotemporal adjustments. Yet, the increased temporal (shortened stance phase) and sensory (deteriorated proprioceptive feedback) constraints required wider motor primitives and a higher contribution of the hamstring muscles during the stance phase. These results are a first step towards improving astronaut training protocols.

DOI： 10.1038/s41598-023-50076-6

PubMed

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Quantification of Extramyocellular Lipids and Intramuscular Fat from Muscle Echo Intensity in Lower Limb Muscles: A Comparison of Four Ultrasound Devices against Magnetic Resonance Spectroscopy 査読

Enzo Piponnier, Masaki Ishikawa, Yoko Kunimasa, Kanae Sano, Kévin Jagot, Nathalie Boisseau, Toshiyuki Kurihara, Vincent Martin

Sensors 23 ( 11 ) 5282 - 5282 2023年6月

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記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：MDPI AG

This study aimed to compare different ultrasound devices with magnetic resonance spectroscopy (MRS) to quantify muscle lipid content from echo intensity (EI). Four different ultrasound devices were used to measure muscle EI and subcutaneous fat thickness in four lower-limb muscles. Intramuscular fat (IMF), intramyocellular (IMCL) and extramyocellular lipids (EMCL) were measured using MRS. Linear regression was used to compare raw and subcutaneous fat thickness-corrected EI values to IMCL, EMCL and IMF. IMCL had a poor correlation with muscle EI (r = 0.17–0.32, NS), while EMCL (r = 0.41–0.84, p < 0.05–p < 0.001) and IMF (r = 0.49–0.84, p < 0.01–p < 0.001) had moderate to strong correlation with raw EI. All relationships were improved when considering the effect of subcutaneous fat thickness on muscle EI measurements. The slopes of the relationships were similar across devices, but there were some differences in the y-intercepts when raw EI values were used. These differences disappeared when subcutaneous fat thickness-corrected EI values were considered, allowing for the creation of generic prediction equations (r = 0.41–0.68, p < 0.001). These equations can be used to quantify IMF and EMCL within lower limb muscles from corrected-EI values in non-obese subjects, regardless of the ultrasound device used.

DOI： 10.3390/s23115282

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Neuromuscular adjustments to unweighted running: the increase in hamstring activity is sensitive to trait anxiety 査読

Camille Fazzari, Robin Macchi, Camélia Ressam, Yoko Kunimasa, Caroline Nicol, Cécile Martha, Benoît Bolmont, Patrick Sainton, Arnaud Hays, Fabrice Vercruyssen, Thomas Lapole, Martin Bossard, Rémy Casanova, Lionel Bringoux, Pascale Chavet

Frontiers in Physiology 14 2023年6月

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記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Frontiers Media SA

Introduction: Originally developed for astronauts, lower body positive pressure treadmills (LBPPTs) are increasingly being used in sports and clinical settings because they allow for unweighted running. However, the neuromuscular adjustments to unweighted running remain understudied. They would be limited for certain lower limb muscles and interindividually variable. This study investigated whether this might be related to familiarization and/or trait anxiety.

Methods: Forty healthy male runners were divided into two equal groups with contrasting levels of trait anxiety (high, ANX+, n = 20 vs. low, ANX−, n = 20). They completed two 9-min runs on a LBPPT. Each included three consecutive 3-min conditions performed at 100%, 60% (unweighted running), and 100% body weight. Normal ground reaction force and electromyographic activity of 11 ipsilateral lower limb muscles were analyzed for the last 30 s of each condition in both runs.

Results: Unweighted running showed muscle- and stretch-shortening cycle phase-dependent neuromuscular adjustments that were repeatable across both runs. Importantly, hamstring (BF, biceps femoris; STSM, semitendinosus/semimembranosus) muscle activity increased during the braking (BF: +44 ± 18%, p &lt; 0.001) and push-off (BF: +49 ± 12% and STSM: +123 ± 14%, p &lt; 0.001 for both) phases, and even more so for ANX+ than for ANX−. During the braking phase, only ANX+ showed significant increases in BF (+41 ± 15%, p &lt; 0.001) and STSM (+53 ± 27%, p &lt; 0.001) activities. During the push-off phase, ANX+ showed a more than twofold increase in STSM activity compared to ANX− (+119 ± 10% vs. +48 ± 27, p &lt; 0.001 for both).

Conclusion: The increase in hamstring activity during the braking and push-off phases may have accelerated the subsequent swing of the free-leg, likely counteracting the unweighting-induced slowing of stride frequency. This was even more pronounced in ANX+ than in ANX−, in an increased attempt not to deviate from their preferred running pattern. These results highlight the importance of individualizing LBPPT training and rehabilitation protocols, with particular attention to individuals with weak or injured hamstrings.

DOI： 10.3389/fphys.2023.1212198

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Is the muscle–tendon architecture of non-athletic Kenyans different from that of Japanese and French males? 査読

Yoko Kunimasa, Kanae Sano, Caroline Nicol, Joëlle Barthèlemy, Masaki Ishikawa

Journal of Physiological Anthropology 42 ( 1 ) 2023年6月

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担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer Science and Business Media LLC

Abstract

Background

In endurance running, elite Kenyan runners are characterized by longer thigh, shank, and Achilles tendon (AT) lengths combined with shorter fascicles and larger medial gastrocnemius (MG) pennation angles than elite Japanese runners. These muscle-tendon characteristics may contribute to the running performance of Kenyans. Furthermore, these specific lower-leg musculoskeletal architectures have been confirmed not only in elite Kenyan runners but also in non-athletic Kenyans since early childhood. However, it remains questionable whether the differences in muscle-tendon architecture between Kenyans and Japanese differ from those of European Caucasians. Therefore, this study aimed to compare anthropometry and muscle–tendon architecture of young non-athletic Kenyan males with their Japanese and French counterparts.

Methods

A total of 235 young non-athletic males, aged 17–22 years, volunteered. The anthropometric measures, thigh, and shank lengths, as well as AT and MG muscle architecture, were measured using ultrasonography and a tape measure. Inter-group differences in anthropometry and muscle-tendon architecture were tested using one-way ANOVA and ANCOVA analyses controlling for shank length and muscle thickness.

Results

The anthropometric and muscle-tendon characteristics of the non-athletic French were closer to those of the Kenyans than to those of the Japanese. However, the ultrasonography analysis confirmed that the non-athletic Kenyans had the longest AT as well as the shortest MG fascicles and the largest pennation angle compared to the French and Japanese, even after controlling for shank length and muscle thickness with ANCOVA, respectively.

Conclusions

These results confirmed the specificity of the muscle-tendon architecture of the triceps surae in Kenyans in comparison to their Japanese and French counterparts in non-athletic adults. This study provides additional support to the fact that Kenyans may have musculotendinous advantages in endurance running.

DOI： 10.1186/s40101-023-00326-3

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その他リンク： https://link.springer.com/article/10.1186/s40101-023-00326-3/fulltext.html
Muscle‐tendon architecture in Kenyans and Japanese: Potential role of genetic endowment in the success of elite Kenyan endurance runners 査読

Yoko Kunimasa, Kanae Sano, Toshiaki Oda, Caroline Nicol, Paavo V. Komi, Masaki Ishikawa

Acta Physiologica 235 ( 2 ) 2022年4月

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担当区分：筆頭著者掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley

DOI： 10.1111/apha.13821

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その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/apha.13821
Sex Differences in Endurance Running 査読

Thibault Besson, Robin Macchi, Jeremy Rossi, Cédric Y. M. Morio, Yoko Kunimasa, Caroline Nicol, Fabrice Vercruyssen, Guillaume Y. Millet

Sports Medicine 2022年2月

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掲載種別：研究論文（学術雑誌）出版者・発行元：Springer Science and Business Media LLC

DOI： 10.1007/s40279-022-01651-w

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その他リンク： https://link.springer.com/article/10.1007/s40279-022-01651-w/fulltext.html
Sex Influence on the Functional Recovery Pattern After a Graded Running Race: Original Analysis to Identify the Recovery Profiles 査読

Robin Macchi, Fabrice Vercruyssen, Arnaud Hays, Gaetan Aubert, Gaetan Exubis, Pascale Chavet, Emmanuelle Goubert, Robin Souron, Yoko Kunimasa, Caroline Nicol

Frontiers in Physiology 12 2021年3月

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掲載種別：研究論文（学術雑誌）出版者・発行元：Frontiers Media SA

This study investigated the sex influence on the acute and delayed fatigue effects of a 20 km graded running race. Eighteen recreational runners, 10 women and 8 men, completed the race. The testing protocol included five sessions: a week before the race (PRE), 35 ± 15 min after (POST), 2 h, 2 and 4 days (2D and 4D) later. Each session included uni- and bilateral maximal isometric voluntary contractions of the knee extensors (MVC), a squat jump (SJ), and a drop jump (DJ). Acute and delayed muscle soreness (DOMS) were evaluated for the quadriceps, hamstring and triceps surae muscle groups. The 2D and 4D sessions included also a horizontal force-velocity test (HF-V) performed under five resistive conditions. For each test, a set of key variables was computed to characterize the lower limb functional recovery. Mixed ANOVA analyses revealed significant (sex × time) interactions, with larger acute drops for men in MVCs and earlier recovery for women in the bilateral MVC (p &lt; 0.001) and DJ (p &lt; 0.05) tests. Only women reported DOMS for the hamstrings at 2D (p &lt; 0.001) and showed small improvements in pure concentric SJ (p &lt; 0.05) and HF-V (p &lt; 0.01) tests at 4D. As expected, DOMS disappeared prior to the complete functional recovery. These results confirmed the combined influence of testing task and sex on the functional recovery pattern while supporting a lesser and faster recovery in women. The originality of this study lies in the complexity and sex-dependence of the functional recovery pattern revealed by a multiple factorial analysis which was used to identify the most discriminating tests and variables in the recovery pattern. The obtained clusters highlighted some recovery profiles associated with greater risks of injury when starting to run again. However, the lack of sex × time interaction for normalized values emphasizes the major influence of men’s initially higher functional values compared to women.

DOI： 10.3389/fphys.2021.649396

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Limb-Specific Features and Asymmetry of Nerve Conduction Velocity and Nerve Trunk Size in Human 査読

Ayaka Nobue, Yoko Kunimasa, Hiromu Tsuneishi, Kanae Sano, Hiroyuki Oda, Masaki Ishikawa

Frontiers in Physiology 11 2020年12月

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記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Frontiers Media SA

This study aimed to simultaneously examine the differences of human nerve conduction velocity (NCV) and nerve cross-sectional area (nCSA) between the upper and lower limbs and between different regions of the upper and lower limbs. Thirty healthy subjects volunteered for the study. NCV and nCSA of the ulnar and tibial nerves were measured with the dominant and non-dominant arms and the supporting and reacting legs using supramaximal electric stimulation and peripheral nerve ultrasonography at three regions for ulnar and tibial nerves, respectively. Supramaximal electric stimulation was superficially applied to the ulnar and tibial nerves at each point. These action potentials were recorded from the digiti minimi and soleus muscles for the ulnar and tibial nerves, respectively. Our results clearly showed that the NCV, nCSA, and circumference of the ulnar and tibial nerves were higher and greater in the lower limbs than in the upper limbs. The greater the circumference, the greater the nCSA for both the upper and lower limbs. However, unlike the upper limbs, the supporting leg did not have higher NCV than the reacting leg despite its greater circumference. Therefore, nCSA can be related to the circumference but not necessarily function for NCV developments of the lower limbs. These various aspects between the upper and lower limbs suggest that NCV does not depend on the nCSA sizes or upper and lower limb circumference; the results indicate the existence of limb-specific NCV but not nCSA developments.

DOI： 10.3389/fphys.2020.609006

Scopus

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Lower complexity of motor primitives ensures robust control of high-speed human locomotion 査読国際誌

Alessandro Santuz, Antonis Ekizos, Yoko Kunimasa, Kota Kijima, Masaki Ishikawa, Adamantios Arampatzis

Heliyon 6 ( 10 ) e05377 - e05377 2020年10月

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記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier BV

Walking and running are mechanically and energetically different locomotion modes. For selecting one or another, speed is a parameter of paramount importance. Yet, both are likely controlled by similar low-dimensional neuronal networks that reflect in patterned muscle activations called muscle synergies. Here, we challenged human locomotion by having our participants walk and run at a very broad spectrum of submaximal and maximal speeds. The synergistic activations of lower limb locomotor muscles were obtained through decomposition of electromyographic data via non-negative matrix factorization. We analyzed the duration and complexity (via fractal analysis) over time of motor primitives, the temporal components of muscle synergies. We found that the motor control of high-speed locomotion was so challenging that the neuromotor system was forced to produce wider and less complex muscle activation patterns. The motor modules, or time-independent coefficients, were redistributed as locomotion speed changed. These outcomes show that humans cope with the challenges of high-speed locomotion by adapting the neuromotor dynamics through a set of strategies that allow for efficient creation and control of locomotion.

DOI： 10.1016/j.heliyon.2020.e05377

PubMed

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陸上短距離選手におけるハムストリングス各筋内の筋横断面積の形態分布の特徴と競技力との関係査読

上野薫, 前濵良太, 国正陽子, 牧野晃宗, 佐野加奈絵, 貴島孝太, Paavo V Komi, 石川昌紀

体力科学 2018年

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記述言語：日本語掲載種別：研究論文（学術雑誌）

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Neuromechanical Modulation of the Achilles Tendon During Bilateral Hopping in Patients with Unilateral Achilles Tendon Rupture, Over 1 Year After Surgical Repair 査読

Hiroyuki Oda, Kanae Sano, Yoko Kunimasa, Paavo V. Komi, Masaki Ishikawa

SPORTS MEDICINE 47 ( 6 ) 1221 - 1230 2017年6月

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記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ADIS INT LTD

Background Patients who have had an Achilles tendon (AT) rupture repaired are potentially at higher risk for re-rupture than those without previous rupture. Little attention has been given to the neuromechanical modulation of muscle-tendon interaction and muscle activation profiles during human dynamic movements after AT rupture repair.
Objective The purpose of this study was to examine muscle-tendon behavior and muscle activation during bilateral hopping.
Methods We enrolled nine subjects who had undergone surgical repair of unilateral AT rupture within the past 1-2 years. Subjects performed bilateral hopping while we took ultrasound, kinematic, and electromyogram recordings and measurements. AT behaviors were also recorded. We then compared responses between values obtained from the ruptured AT leg (LEG(ATR)) and non-ruptured AT leg (LEG(NOR)).
Results During hopping, the AT stretching amplitudes were greater in the LEG(ATR) than in the LEG(NOR), although the peak AT force and stiffness were smaller in the LEG(ATR) than in the LEG(NOR). The AT negative mechanical work did not show any significant differences between both legs. However, positive works were significantly lower in the LEG(ATR) than in the LEG(NOR). Electromyogram patterns in both soleus and tibialis anterior muscles clearly differed after ground contact for the LEG(ATR) and the LEG(NOR).
Conclusions These results suggest that the repaired ruptured AT can be compliant and have insufficient Young's modulus, which can influence mechanical responses in muscle activities. The modulation of agonist-antagonist muscle activities corresponding to the different levels of stiffness between the LEG(ATR) and the LEG(NOR) may not be fully functioning during the pre-activation phase.

DOI： 10.1007/s40279-016-0629-3

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PubMed

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下腿の骨格・筋腱形態に東アフリカ地域の陸上中長距離選手特有の特徴はあるのか査読

国正陽子, 佐野加奈絵, 久野峻幸, 牧野晃宗, 小田俊明, Caroline Nicol, Paavo V Komi, 石川昌紀

大阪体育学研究 55 ( 55 ) 1 - 9 2017年3月

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記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：大阪体育学会

CiNii Article

CiNii Books

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剣道経験年数の違いによる左右脚のアキレス腱の形態と力学的特性について査読

牧野晃宗, 岩崎正徳, 国正陽子, 久野峻幸, 佐野加奈絵, 村元辰寛, 村上雷多, 神﨑浩, 小田俊明, 石川昌紀

体育学研究 61 ( 2 ) 639 - 649 2016年

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記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：(一社)日本体育学会

中段の構えで剣道を行っている小学生から成人の男性剣道実践者65名と、一般男子大学生20名(一般成人)を対象に、アキレス腱と腓腹筋の形態の左右差について調査を行った。剣道実践者は、剣道経験年数で初心者群(平均経験年数3年)22名、中堅者群(平均経験年数8年)21名、熟練者群(平均経験年数16年)22名に振り分けた。熟練剣道実践者ほどアキレス腱の形態(長さや太さ)の左右差が大きく、一般成人より剣道実践者の蹴り脚において、アキレス腱は細く、その組織スティフネスが低いという結果が得られた。特に剣道実践者における蹴り脚のアキレス腱組織の材質(スティフネスとヤング率)の低さは、剣道の動作やトレーニングの経験年数と関係する可能性があり、剣道実践者における蹴り脚のアキレス腱断裂の生じやすさに影響を及ぼしていると考えられた。左右脚で異なる剣道特有の動作やそのトレーニング経験によって、左右差が大きくなっていることが示唆された。

DOI： 10.5432/jjpehss.16012

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その他リンク： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2016&ichushi_jid=J00793&link_issn=&doc_id=20161229170002&doc_link_id=10.5432%2Fjjpehss.16012&url=https%3A%2F%2Fdoi.org%2F10.5432%2Fjjpehss.16012&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_3.gif
肉体的特徴から東アフリカ陸上競技選手の走りの特徴を探る査読

石川昌紀, 佐野加奈絵, 国正陽子, 小田俊明, KOMI PV, KOMI PV

ランニング学研究 26 ( 2 ) 75‐80 2015年6月

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記述言語：日本語

J-GLOBAL

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Can measures of muscle-tendon interaction improve our understanding of the superiority of Kenyan endurance runners? 査読

Kanae Sano, Caroline Nicol, Masanobu Akiyama, Yoko Kunimasa, Toshiaki Oda, Akira Ito, Elio Locatelli, Paavo V. Komi, Masaki Ishikawa

EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY 115 ( 4 ) 849 - 859 2015年4月

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記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER

Leg muscle activation profiles and muscle-tendon interaction were studied with eleven internationally high-level Kenyan and eleven national level Japanese distance runners.
Ultrasonography and kinematics were applied together with surface electromyography (EMG) recordings of leg muscles when subjects ran on treadmill at 9.0 (SLOW) and 13.9 km h(-1) (MEDIUM).
At each speed, both groups presented similar contact and flight times. The kinematic and ultrasound analyses revealed that, in contrast to the Japanese runners, the Kenyans demonstrated during contact smaller stretching and shortening amplitudes (p < 0.01) of the tendinous tissue of medial gastrocnemius (MG), but greater tendon contribution to the muscle-tendon unit shortening (p < 0.05). The MG fascicles of the Kenyans were shorter not only at the resting standing position, but also during the contact phase at both running speeds (p < 0.01). The EMG profiles of the Kenyans showed lower braking/preactivation ratio in both MG and tibialis anterior (p < 0.05) muscles. They were also characterized by negative relationships between the Achilles tendon moment arm and the MG fascicle shortening during contact (r = -0.54, p < 0.01). In contrast, the Japanese presented the classical stretch-shortening cycle muscle activation profile of relatively high MG EMG activity during the braking phase.
These findings provide new suggestions that the Kenyans have unique structural characteristics which can result in the reduction of muscle and tendinous stretch-shortening loading together with smaller muscle activation during contact at submaximal running speed.

DOI： 10.1007/s00421-014-3067-7

Web of Science

PubMed

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陸上短距離選手と競泳選手のドロップジャンプ接地前後の筋束長と筋活動の変化査読

新井彩, 石川昌紀, 浦田達也, 国正陽子, 佐野加奈絵, 田中ひかる, 伊藤章

体力科学 64 ( 1 ) 165 - 172 2015年

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記述言語：日本語掲載種別：研究論文（学術雑誌）

DOI： 10.7600/jspfsm.64.165

Scopus

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立位での異なる足関節底屈位におけるヒラメ筋外部アキレス腱伸張率の算出査読

小田啓之, 佐野加奈絵, 国正陽子, 石川昌紀

大阪体育学研究 53 ( 53 ) 1 - 9 2015年

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記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：大阪体育学会

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Specific muscle-tendon architecture in elite Kenyan distance runners 査読

Y. Kunimasa, K. Sano, T. Oda, C. Nicol, P. V. Komi, E. Locatelli, A. Ito, M. Ishikawa

SCANDINAVIAN JOURNAL OF MEDICINE & SCIENCE IN SPORTS 24 ( 4 ) E269 - E274 2014年8月

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担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-BLACKWELL

The Achilles tendon moment arm (MA_ AT) and foot lever ratio (FLR) can play important roles for force production and movement economy during locomotion. This notion has become more relevant, and suggestion has been given that the Kenyan runners belonging to the world elite would have specific anatomical, mechanical, and functional properties in their lower limbs and that this feature could be responsible for their high running economy. The present study aimed to characterize the AT of elite Kenyan distance runners as compared with Japanese ones, and to examine the potential relationship with their running performance. Ultrasonography was used to measure AT cross-sectional area and AT soleus and gastrocnemius lengths. MA_ AT and FLR were calculated from the position of anatomical landmarks using sagittal plane photographs. MA_ AT was significantly longer and the FLR lower in Kenyans than in Japanese. Independently of the group, the running performance was positively related to the MA_ AT (r = 0.55, P < 0.001) and negatively to the FLR (r = -0.45, P = 0.002). These results suggest that longer MA_ AT and lower FLR could be advantageous in elite Kenyan runners, by contributing to effective endurance running performance in a protective and economical way.

DOI： 10.1111/sms.12161

Web of Science

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Economical running strategy for East African distance runners 招待

Ishikawa Masaki, Sano Kanae, Kunimasa Yoko, ODA Toshiaki, NICOL Caroline, ITO Akira, KOMI Paavo V

The journal of physical fitness and sports medicine : JPFSM 2 ( 3 ) 361 - 363 2013年8月

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記述言語：英語出版者・発行元：The Japanese Society of Physical Fitness and Sports Medicine

The superior success of East-African endurance runners has stimulated a large amount of interest in exploring valid reasons for their performance, especially for neuromuscular mechanics. This review provides a brief overview of classic neuromuscular interaction during running; and, thereafter, describes a specific neuromuscular interaction alternative to the classic stretch-shortening cycle concept for enhancing the running economy of East-African distance runners.

DOI： 10.7600/jpfsm.2.361

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その他リンク： https://jlc.jst.go.jp/DN/JALC/10023205641?from=CiNii

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MISC

アキレス腱断裂経験者における断裂経験脚のアキレス腱の弛みと力学的特性

小田啓之, 小田啓之, 佐野加奈絵, 信江彩加, 国正陽子, 石川昌紀

大阪体育学研究(Web) 60 2022年

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J-GLOBAL

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アシステッド走による超高速疾走中の走メカニクス

常石大夢, 大橋廉, 北野友梧, 国正陽子, 永原隆, 貴嶋孝太, 石川昌紀

大阪体育学研究(Web) ( 58 Supplement ) 2020年

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J-GLOBAL

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等張性負荷装置を用いた高速での牽引負荷走の有用性

北野友梧, 常石大夢, 大橋廉, 国正陽子, 貴嶋孝太, 石川昌紀

大阪体育学研究(Web) ( 58 Supplement ) 2020年

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J-GLOBAL

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マスターズ陸上競技選手の神経・筋機能の特徴

石川昌紀, 佐野加奈絵, 国正陽子, 牧野晃宗, 秋山真信, 信江彩加, 小田俊明, PAAVO Komi V

体力科学 65 ( 1 ) 2016年

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J-GLOBAL

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肉体的特徴から東アフリカ陸上競技選手の走りの特徴を探る (第26回ランニング学会大会・プログラム報告) -- (シンポジウム東アフリカランナーの強さの秘密を再考する)

石川昌紀, 佐野加奈絵, 国正陽子

ランニング学研究 = Journal of running science 26 ( 2 ) 75 - 80 2015年6月

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記述言語：日本語出版者・発行元：ランニング学会

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05バ-25-ポ-03 アキレス腱長の可塑性について(05 バイオメカニクス,一般研究発表,2020東京オリンピック・パラリンピックと体育・スポーツ科学研究)

牧野晃宗, 秋山真信, 信江彩加, 国正陽子, 久野峻幸, 石川昌紀

日本体育学会大会予稿集 66 ( 0 ) 200 - 200 2015年

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記述言語：日本語出版者・発行元：一般社団法人日本体育学会

DOI： 10.20693/jspehss.66.200_2

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05バ-26-口-14 東アフリカのトップランナーの下腿の形態は日本人と異なるのか?(05 バイオメカニクス,一般研究発表,2020東京オリンピック・パラリンピックと体育・スポーツ科学研究)

国正陽子, 佐野加奈絵, 久野峻幸, 牧野晃宗, 小田俊明, 石川昌紀

日本体育学会大会予稿集 66 ( 0 ) 195 - 195 2015年

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記述言語：日本語出版者・発行元：一般社団法人日本体育学会

DOI： 10.20693/jspehss.66.195_2

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05バ-25-口-02 ドロップジャンプの筋-腱の振る舞いに影響を及ぼす筋活動の役割(05 バイオメカニクス,一般研究発表,2020東京オリンピック・パラリンピックと体育・スポーツ科学研究)

新井彩, 石川昌紀, 浦田達也, 国正陽子, 佐野加奈絵, 田中ひかる, 伊藤章

日本体育学会大会予稿集 66 ( 0 ) 2015年

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記述言語：日本語出版者・発行元：一般社団法人日本体育学会

CiNii Article

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A-31 身体運動中の筋機能を探るBモード超音波イメージング法(OS 可視化された生体内情報のヘルス&スポーツサイエンス応用)

石川昌紀, 信江彩加, 佐野加奈絵, 国正陽子, 牧野晃宗

シンポジウム: スポーツ・アンド・ヒューマン・ダイナミクス講演論文集 2015 ( 0 ) _A - 31-1_-_A-31-5_ 2015年

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記述言語：日本語出版者・発行元：一般社団法人日本機械学会

The exploration of muscle mechanics during natural human locomotion is a continuous challenge. Ultrasonography is a technique, which can be used to study the fascicle and tendon length changes during movements. However, many of the ealier studies were unable to precisely identify how the fascicles behave in different muscles. This may have caused misleading generalizations. In addition, because the muscle spindles are located inside the contractile tissue, it is important to determine the role that stretch reflexes may play during rapid and intensive dynamic movements. Brightness mode ultrasonography has revealed that, in human locomotion, the nature of fascicle and tendon length changes varies depending on the task, contraction intensity, and the muscles involved. The findings emphasize that the active fascicles of the gestrocnemius muscle are suddenly stretched, although they are shortening. This short-lasting stretch triggers the stretch reflex, timing of which is dependent on running speed.

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バ28-011 接地動作の違いによる走運動中のアキレス腱張力の変化とその影響(05 バイオメカニクス,一般研究発表抄録)

石川昌紀, 佐野加奈絵, 国正陽子, 伊藤章

日本体育学会大会予稿集 65 ( 0 ) 157 - 157 2014年

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記述言語：日本語出版者・発行元：一般社団法人日本体育学会

DOI： 10.20693/jspehss.65.157_3

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中・長距離走に活かす筋腱のメカニクスとトレーニングの可能性 (特集トレーニングに活かすバイオメカニクス知見)

石川昌紀, 佐野加奈絵, 国正陽子

バイオメカニクス研究 = Japanese journal of biomechanics in sports & exercise : 日本バイオメカニクス学会機関誌 18 ( 3 ) 170 - 175 2014年

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記述言語：日本語出版者・発行元：日本バイオメカニクス学会事務局

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シンスプリント治療におけるアキレス腱部への押圧刺激に伴う血流と筋硬度の変化

佐野加奈絵, 石川昌紀, 国正陽子, 中村誠治, 西下正成, 伊藤章

大阪体育学研究 = Osaka research journal of physical education ( 51 ) 19 - 23 2013年2月

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記述言語：日本語出版者・発行元：大阪体育学会

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その他リンク： http://search.jamas.or.jp/link/ui/2013243375
05バ-28-ポ-58 ケニア人陸上競技中長距離ランナーにおける下腿部筋腱の力学的特性(05 バイオメカニクス,一般研究発表抄録)

豊田洋平, 久野峻幸, 国正陽子, 佐野加奈絵, 楠本一樹, 兒玉友, 石川昌紀

日本体育学会大会予稿集 64 ( 0 ) 214 - 214 2013年

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記述言語：日本語出版者・発行元：一般社団法人日本体育学会

DOI： 10.20693/jspehss.64.214_1

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05バ-30-口-20 東アフリ力中・長距離陸上競技選手の走運動中における筋腱の振る舞い(05 バイオメカニクス,一般研究発表抄録)

佐野加奈絵, 国正陽子, 小田俊明, 伊藤章, 石川昌紀

日本体育学会大会予稿集 64 ( 0 ) 199 - 199 2013年

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記述言語：日本語出版者・発行元：一般社団法人日本体育学会

DOI： 10.20693/jspehss.64.199_2

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ケニア人陸上中長距離選手の下肢形態の特徴

国正陽子, 佐野加奈絵, 團野亮人, 信江彩加, 小田俊明, 石川昌紀

大阪体育学研究 ( 51 Supplement ) 2013年

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J-GLOBAL

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陸上中長距離選手のアキレス腱とアキレス腱モーメントアームの特徴

国正陽子, 團野亮人, 佐野加奈絵, 信江彩加, 久野峻幸, 小田俊明, 石川昌紀

体力科学 61 ( 6 ) 2012年

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J-GLOBAL

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ケニア人陸上中長距離選手のアキレス腱とアキレス腱モーメントアームの特徴

国正陽子, 佐野加奈絵, 團野亮人, 信江彩加, 久野峻幸, 小田俊明, 石川昌紀

日本トレーニング科学会大会プログラム・抄録集 25th 2012年

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J-GLOBAL

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受賞

平成29年度大阪体育学会奨励賞

2018年3月大阪体育学会

国正陽子, 佐野加奈絵, 久野峻幸, 牧野晃宗, 小田俊明, Caroline Nicol, Paavo V Komi, 石川昌紀

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Young Investigators Award

2013年7月 European College of Sport Science

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トレーニング科学研究奨励賞

2012年12月日本トレーニング科学会

国正陽子, 佐野加奈絵, 團野亮人, 信江彩加, 久野峻幸, 小田俊明, 石川昌紀

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共同研究・競争的資金等の研究

ヒト生体における筋代謝コストを決定する筋収縮メカニクスの解明

研究課題/領域番号：24K20561

2024年4月 - 2027年3月

制度名：科学研究費助成事業

研究種目：若手研究

提供機関：日本学術振興会

国正陽子

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配分額：4680000円（直接経費：3600000円、間接経費：1080000円）

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ヒト生体データに基づく骨格・筋腱の形態と機能の統合的理解

2019年4月 - 2024年3月

制度名：若手研究

提供機関：日本学術振興会

国正陽子

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担当区分：研究代表者資金種別：競争的資金

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多様なヒトの骨格・筋・腱形態の特徴と可塑性

2017年9月 - 2019年3月

制度名：研究活動スタート支援

提供機関：日本学術振興会

国正陽子

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担当区分：研究代表者資金種別：競争的資金

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担当経験のある授業科目

体育科教育法

2023年

-

現在
機関名：新潟大学
学問の扉知と方法の最前線

2023年

-

現在
機関名：新潟大学
スポーツ生理学

2023年

-

現在
機関名：新潟大学
スタディ・スキルズP

2023年

-

現在
機関名：新潟大学
生理学・運動生理学

2023年

-

現在
機関名：新潟大学
健康スポーツ科学実習 I

2023年

-

現在
機関名：新潟大学
健康スポーツ科学実習 II(スキー II)

2023年

-

現在
機関名：新潟大学
健康スポーツ科学実習 II(スキー I)

2023年

-

現在
機関名：新潟大学
学問の扉知と方法の最前線

2023年

-

現在
機関名：新潟大学
スポーツ生理学

2023年

-

現在
機関名：新潟大学
スタディ・スキルズP

2023年

-

現在
機関名：新潟大学
生理学・運動生理学

2023年

-

現在
機関名：新潟大学
健康スポーツ科学実習 I

2023年

-

現在
機関名：新潟大学
健康スポーツ科学実習 II(スキー II)

2023年

-

現在
機関名：新潟大学
健康スポーツ科学実習 II(スキー I)

2023年

-

現在
機関名：新潟大学

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