Ryota Akagi

2008

Establishing a new index of muscle cross-sectional area and its relationship with isometric muscle strength

Akagi, R., Kanehisa, H., Kawakami, Y. & Fukunaga, T., 2008 1, In: Journal of Strength and Conditioning Research. 22, 1, p. 82-87 6 p.

研究成果: Article › 査読

53 被引用数 (Scopus)

2009

Muscle volume compared to cross-sectional area is more appropriate for evaluating muscle strength in young and elderly individuals

Akagi, R., Takai, Y., Ohta, M., Kanehisa, H., Kawakami, Y. & Fukunaga, T., 2009, In: Age and Ageing. 38, 5, p. 564-569 6 p.

研究成果 › 査読

100 被引用数 (Scopus)

Relationships between muscle strength and indices of muascle cross-sectional area determined during maximal voluntary contraction in middle-aged and elderly individuals

Akagi, R., Tarai, Y., Kato, E., Fukuda, M., Wakahara, T., Ohta, M., Kanehisa, H., Kawakami, Y. & Fukunaga, T., 2009 7, In: Journal of Strength and Conditioning Research. 23, 4, p. 1258-1262 5 p.

研究成果: Article › 査読

17 被引用数 (Scopus)

Sit-to-stand test to evaluate knee extensor muscle size and strength in the elderly: A novel approach

Takai, Y., Ohta, M., Akagi, R., Kanehisa, H., Kawakami, Y. & Fukunaga, T., 2009, In: Journal of Physiological Anthropology. 28, 3, p. 123-128 6 p.

研究成果 › 査読

76 被引用数 (Scopus)

2010

Development of an equation to predict muscle volume of elbow flexors for men and women with a wide range of age

Akagi, R., Takai, Y., Kato, E., Wakahara, T., Ohta, M., Kanehisa, H., Fukunaga, T. & Kawakami, Y., 2010 3, In: European Journal of Applied Physiology. 108, 4, p. 689-694 6 p.

研究成果 › 査読

19 被引用数 (Scopus)

2011

Longitudinal and transverse deformation of human Achilles tendon induced by isometric plantar flexion at different intensities

Iwanuma, S., Akagi, R., Kurihara, T., Ikegawa, S., Kanehisa, H., Fukunaga, T. & Kawakami, Y., 2011 6, In: Journal of Applied Physiology. 110, 6, p. 1615-1621 7 p.

研究成果: Article › 査読

32 被引用数 (Scopus)

Methodological issues related to thickness-based muscle size evaluation

Akagi, R., Iwanuma, S., Fukuoka, M., Kanehisa, H., Fukunaga, T. & Kawakami, Y., 2011, In: Journal of Physiological Anthropology. 30, 4, p. 169-174 6 p.

研究成果: Article › 査読

6 被引用数 (Scopus)

Size-strength relationships of the elbow flexors and extensors are not affected by age or gender

Akagi, R., Takai, Y., Ohta, M., Kanehisa, H., Fukunaga, T. & Kawakami, Y., 2011 7, In: European Journal of Sport Science. 11, 4, p. 277-282 6 p.

研究成果: Article › 査読

6 被引用数 (Scopus)

Triceps surae muscle-tendon unit length changes as a function of ankle joint angles and contraction levels: The effect of foot arch deformation

Iwanuma, S., Akagi, R., Hashizume, S., Kanehisa, H., Yanai, T. & Kawakami, Y., 2011 9 23, In: Journal of Biomechanics. 44, 14, p. 2579-2583 5 p.

研究成果: Article › 査読

20 被引用数 (Scopus)

2012

In vivo determination of the Achilles tendon moment arm in three-dimensions

Hashizume, S., Iwanuma, S., Akagi, R., Kanehisa, H., Kawakami, Y. & Yanai, T., 2012 1 10, In: Journal of Biomechanics. 45, 2, p. 409-413 5 p.

研究成果: Article › 査読

34 被引用数 (Scopus)

In vivo measurements of moment arm lengths of three elbow flexors at rest and during isometric contractions

Akagi, R., Iwanuma, S., Hashizume, S., Kanehisa, H., Yanai, T. & Kawakami, Y., 2012 2, In: Journal of Applied Biomechanics. 28, 1, p. 63-69 7 p.

研究成果: Article › 査読

9 被引用数 (Scopus)

Muscle strength and size balances between reciprocal muscle groups in the thigh and lower leg for young men

Akagi, R., Tohdoh, Y. & Takahashi, H., 2012, In: International Journal of Sports Medicine. 33, 5, p. 386-389 4 p.

研究成果: Article › 査読

9 被引用数 (Scopus)

Relationships between muscle size and hardness of the medial gastrocnemius at different ankle joint angles in young men

Akagi, R., Chino, K., Dohi, M. & Takahashi, H., 2012 4, In: Acta Radiologica. 53, 3, p. 307-311 5 p.

研究成果: Article › 査読

32 被引用数 (Scopus)

Reliability and Validity of Quantifying Absolute Muscle Hardness Using Ultrasound Elastography

Chino, K., Akagi, R., Dohi, M., Fukashiro, S. & Takahashi, H., 2012 9 21, In: PLoS ONE. 7, 9, e45764.

研究成果 › 査読

75 被引用数 (Scopus)

2013

Acute effect of static stretching on hardness of the gastrocnemius muscle

Akagi, R. & Takahashi, H., 2013 7, In: Medicine and Science in Sports and Exercise. 45, 7, p. 1348-1354 7 p.

研究成果: Article › 査読

88 被引用数 (Scopus)

Calculation of force and power during bench throws using a smith machine: The importance of considering the effect of counterweights

Kobayashi, Y., Narazaki, K., Akagi, R., Nakagaki, K., Kawamori, N. & Ohta, K., 2013, In: International Journal of Sports Medicine. 34, 9, p. 820-824 5 p.

研究成果: Article › 査読

2 被引用数 (Scopus)

Sex difference in strength and size ratios between reciprocal muscle groups in the lower leg

Akagi, R., Tohdoh, Y. & Takahashi, H., 2013, In: International Journal of Sports Medicine. 34, 5, p. 449-452 4 p.

研究成果: Article › 査読

5 被引用数 (Scopus)

Validity of ultrasound muscle thickness measurements for predicting leg skeletal muscle mass in healthy Japanese middle-aged and older individuals

Takai, Y., Ohta, M., Akagi, R., Kato, E., Wakahara, T., Kawakami, Y., Fukunaga, T. & Kanehisa, H., 2013 9 25, In: Journal of Physiological Anthropology. 32, 1, 12.

研究成果 › 査読

26 被引用数 (Scopus)

2014

Applicability of ultrasound muscle thickness measurements for predicting fat-free mass in elderly population

Takai, Y., Ohta, M., Akagi, R., Kato, E., Wakahara, T., Kawakami, Y., Fukunaga, T. & Kanehisa, H., 2014 6, In: Journal of Nutrition, Health and Aging. 18, 6, p. 579-585 7 p.

研究成果: Article › 査読

46 被引用数 (Scopus)

Association between contraction-induced increases in elbow flexor muscle thickness and distal biceps brachii tendon moment arm depends on the muscle thickness measurement site

Akagi, R., Iwanuma, S., Hashizume, S., Kanehisa, H., Yanai, T. & Kawakami, Y., 2014 2, In: Journal of Applied Biomechanics. 30, 1, p. 134-139 6 p.

研究成果: Article › 査読

4 被引用数 (Scopus)

Effect of a 5-week static stretching program on hardness of the gastrocnemius muscle

Akagi, R. & Takahashi, H., 2014 12 1, In: Scandinavian Journal of Medicine and Science in Sports. 24, 6, p. 950-957 8 p.

研究成果: Article › 査読

67 被引用数 (Scopus)

Measurement of muscle architecture concurrently with muscle hardness using ultrasound strain elastography

Chino, K., Akagi, R., Dohi, M. & Takahashi, H., 2014 9, In: Acta Radiologica. 55, 7, p. 833-839 7 p.

研究成果: Article › 査読

17 被引用数 (Scopus)

Relationship of pectoralis major muscle size with bench press and bench throw performances

Akagi, R., Tohdoh, Y., Hirayama, K. & Kobayashi, Y., 2014 6, In: Journal of Strength and Conditioning Research. 28, 6, p. 1778-1782 5 p.

研究成果: Article › 査読

8 被引用数 (Scopus)

Strength and size ratios between reciprocal muscle groups in the thigh and lower leg of male collegiate soccer players

Akagi, R., Tohdoh, Y. & Takahashi, H., 2014 3, In: Clinical Physiology and Functional Imaging. 34, 2, p. 121-125 5 p.

研究成果 › 査読

8 被引用数 (Scopus)

The contraction-induced increase in Achilles tendon moment arm: A three-dimensional study

Hashizume, S., Iwanuma, S., Akagi, R., Kanehisa, H., Kawakami, Y. & Yanai, T., 2014 9 22, In: Journal of Biomechanics. 47, 12, p. 3226-3231 6 p.

研究成果: Article › 査読

10 被引用数 (Scopus)

2015

Age-related differences in muscle shear moduli in the lower extremity

Akagi, R., Yamashita, Y. & Ueyasu, Y., 2015 11, In: Ultrasound in Medicine and Biology. 41, 11, p. 2906-2912 7 p.

研究成果: Article › 査読

50 被引用数 (Scopus)

Comparison Between Neck and Shoulder Stiffness Determined by Shear Wave Ultrasound Elastography and a Muscle Hardness Meter

Akagi, R. & Kusama, S., 2015 8 1, In: Ultrasound in Medicine and Biology. 41, 8, p. 2266-2271 6 p.

研究成果 › 査読

28 被引用数 (Scopus)

Determination of contraction-induced changes in elbow flexor cross-sectional area for evaluating muscle size-strength relationship during contraction

Akagi, R., Iwanuma, S., Hashizume, S., Kanehisa, H., Fukunaga, T. & Kawakami, Y., 2015 6 5, In: Journal of Strength and Conditioning Research. 29, 6, p. 1741-1747 7 p.

研究成果: Article › 査読

5 被引用数 (Scopus)

Muscle hardness of the triceps brachii before and after a resistance exercise session: A shear wave ultrasound elastography study

Akagi, R., Tanaka, J., Shikiba, T. & Takahashi, H., 2015 12 1, In: Acta Radiologica. 56, 12, p. 1487-1493 7 p.

研究成果: Article › 査読

24 被引用数 (Scopus)

2016

A six-week resistance training program does not change shear modulus of the triceps brachii

Akagi, R., Shikiba, T., Tanaka, J. & Takahashi, H., 2016 8, In: Journal of Applied Biomechanics. 32, 4, p. 373-378 6 p.

研究成果: Article › 査読

15 被引用数 (Scopus)

Association between rapid force production by the plantar flexors and balance performance in elderly men and women

Ema, R., Saito, M., Ohki, S., Takayama, H., Yamada, Y. & Akagi, R., 2016 12 1, In: Age. 38, 5-6, p. 475-483 9 p.

研究成果: Article › 査読

28 被引用数 (Scopus)

Effects of 4 Weeks of Explosive-type Strength Training for the Plantar Flexors on the Rate of Torque Development and Postural Stability in Elderly Individuals

Kobayashi, Y., Ueyasu, Y., Yamashita, Y. & Akagi, R., 2016 6 1, In: International Journal of Sports Medicine. 37, 6, p. 470-475 6 p.

研究成果: Article › 査読

11 被引用数 (Scopus)

Shear modulus of the lower leg muscles in patients with medial tibial stress syndrome

Akiyama, K., Akagi, R., Hirayama, K., Hirose, N., Takahashi, H. & Fukubayshi, T., 2016 8 1, In: Ultrasound in Medicine and Biology. 42, 8, p. 1779-1783 5 p.

研究成果: Article › 査読

13 被引用数 (Scopus)

Unique activation of the quadriceps femoris during single- and multi-joint exercises

Ema, R., Sakaguchi, M., Akagi, R. & Kawakami, Y., 2016 5 1, In: European Journal of Applied Physiology. 116, 5, p. 1031-1041 11 p.

研究成果: Article › 査読

29 被引用数 (Scopus)

Validity of muscle thickness-based prediction equation for quadriceps femoris volume in middle-aged and older men and women

Nakatani, M., Takai, Y., Akagi, R., Wakahara, T., Sugisaki, N., Ohta, M., Kawakami, Y., Fukunaga, T. & Kanehisa, H., 2016 9 2, (Accepted/In press) In: European Journal of Applied Physiology. p. 1-9 9 p.

研究成果: Article › 査読

6 被引用数 (Scopus)

2017

Effect of calf-raise training on rapid force production and balance ability in elderly men

Ema, R., Ohki, S., Takayama, H., Kobayashi, Y. & Akagi, R., 2017, In: Journal of Applied Physiology. 123, 2, p. 424-433 10 p.

研究成果: Article › 査読

Open Access

11 被引用数 (Scopus)

Effect of prolonged vibration to synergistic and antagonistic muscles on the rectus femoris activation during multi-joint exercises

Ema, R., Takayama, H., Miyamoto, N. & Akagi, R., 2017 10 1, In: European Journal of Applied Physiology. 117, 10, p. 2109-2118 10 p.

研究成果 › 査読

3 被引用数 (Scopus)

Muscle shear moduli changes and frequency of alternate muscle activity of plantar flexor synergists induced by prolonged low-level contraction

Akagi, R., Fukui, T., Kubota, M., Nakamura, M. & Ema, R., 2017 9 20, In: Frontiers in Physiology. 8, SEP, 708.

研究成果: Article › 査読

8 被引用数 (Scopus)

2018

Effects of sex and joint action on voluntary activation

Ema, R., Suzuki, M., Kawaguchi, E., Saito, I. & Akagi, R., 2018, In: PeerJ. 2018, 11, e5968.

研究成果: Article › 査読

5 被引用数 (Scopus)

Muscle size-strength relationship including ultrasonographic echo intensity and voluntary activation level of a muscle group

Akagi, R., Suzuki, M., Kawaguchi, E., Miyamoto, N., Yamada, Y. & Ema, R., 2018 3, In: Archives of Gerontology and Geriatrics. 75, p. 185-190 6 p.

研究成果: Article › 査読

18 被引用数 (Scopus)

Neuromuscular adaptations induced by adjacent joint training

Ema, R., Saito, I. & Akagi, R., 2018 3, In: Scandinavian Journal of Medicine and Science in Sports. 28, 3, p. 947-960 14 p.

研究成果 › 査読

13 被引用数 (Scopus)

2019

Acceptable timing error at ball-bat impact for different pitches and its implications for baseball skills

Kidokoro, S., Matsuzaki, Y. & Akagi, R., 2019 8 1, In: Human Movement Science. 66, p. 554-563 10 p.

研究成果: Article › 査読

5 被引用数 (Scopus)

Effect of acute eye fatigue on cognition for young females: A pilot study

Akagi, R., Tonotsuka, M., Horie, R., Hirata, K. & Ando, S., 2019, In: PeerJ. 2019, 10, p. 1V e7978.

研究成果: Article › 査読

Open Access

2 被引用数 (Scopus)

Sex difference in fatigability of knee extensor muscles during sustained low-level contractions

Akagi, R., Sato, S., Yoshihara, K., Ishimatsu, H. & Ema, R., 2019 12 1, In: Scientific Reports. 9, 1, 16718.

研究成果: Article › 査読

Open Access

1 被引用数 (Scopus)

2020

Active recovery has a positive and acute effect on recovery from fatigue induced by repeated maximal voluntary contractions of the plantar flexors

Akagi, R., Imaizumi, N., Sato, S., Hirata, N., Tanimoto, H. & Hirata, K., 2020 2, In: Journal of Electromyography and Kinesiology. 50, 102384.

研究成果: Article › 査読

Open Access

3 被引用数 (Scopus)

Age-Related Differences in the Effect of Prolonged Vibration on Maximal and Rapid Force Production and Balance Ability

Ema, R., Kanda, A., Shoji, M., Iida, N. & Akagi, R., 2020 10 29, In: Frontiers in Physiology. 11, 598996.

研究成果 › 査読

Open Access

2 被引用数 (Scopus)

Associations between Range of Motion and Tissue Stiffness in Young and Older People

Hirata, K., Yamadera, R. & Akagi, R., 2020 10 1, In: Medicine and Science in Sports and Exercise. 52, 10, p. 2179-2188 10 p.

研究成果: Article › 査読

Open Access

12 被引用数 (Scopus)

Can Static Stretching Reduce Stiffness of the Triceps Surae in Older Men?

Hirata, K., Yamadera, R. & Akagi, R., 2020 3 1, In: Medicine and Science in Sports and Exercise. 52, 3, p. 673-679 7 p.

研究成果: Article › 査読

8 被引用数 (Scopus)

Carbon dioxide hydrate as a recovery tool after fatigue of the plantar flexors

Hirata, K., Tanimoto, H., Sato, S., Hirata, N., Imaizumi, N., Sugihara, Y., Murakami, H. & Akagi, R., 2020 7 17, In: Journal of Biomechanics. 108, 109900.

研究成果 › 査読

Open Access

Differential contributions of fatigue-induced strength loss and slowing of angular velocity to power loss following repeated maximal shortening contractions

Akagi, R., Hinks, A., Davidson, B. & Power, G. A., 2020 2 1, In: Physiological reports. 8, 3, e14362.

研究成果: Article › 査読

Open Access

5 被引用数 (Scopus)

赤木 亮太

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赤木亮太