Koji Hiraki

1.1k total citations
33 papers, 685 citations indexed

About

Koji Hiraki is a scholar working on Cardiology and Cardiovascular Medicine, Nephrology and Complementary and alternative medicine. According to data from OpenAlex, Koji Hiraki has authored 33 papers receiving a total of 685 indexed citations (citations by other indexed papers that have themselves been cited), including 19 papers in Cardiology and Cardiovascular Medicine, 11 papers in Nephrology and 9 papers in Complementary and alternative medicine. Recurrent topics in Koji Hiraki's work include Cardiac Health and Mental Health (11 papers), Dialysis and Renal Disease Management (11 papers) and Cardiovascular and exercise physiology (9 papers). Koji Hiraki is often cited by papers focused on Cardiac Health and Mental Health (11 papers), Dialysis and Renal Disease Management (11 papers) and Cardiovascular and exercise physiology (9 papers). Koji Hiraki collaborates with scholars based in Japan and United States. Koji Hiraki's co-authors include Kazuhiro P. Izawa, Yuji Morio, Satoshi Watanabe, Yusuke Kasahara, Koichiro Oka, Kazuto Omiya, Naohiko Osada, Yugo Shibagaki, Tsutomu Sakurada and Takashi Yasuda and has published in prestigious journals such as SHILAP Revista de lepidopterología, The American Journal of Cardiology and International Journal of Environmental Research and Public Health.

In The Last Decade

Koji Hiraki

32 papers receiving 664 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Koji Hiraki Japan	16	284	237	213	135	112	33	685
Yuji Morio Japan	13	207 0.7×	194 0.8×	93 0.4×	115 0.9×	65 0.6×	19	461
Pelagia Koufaki United Kingdom	16	228 0.8×	228 1.0×	666 3.1×	176 1.3×	329 2.9×	46	1.0k
Masakazu Saitoh Japan	20	559 2.0×	553 2.3×	74 0.3×	150 1.1×	143 1.3×	93	1.2k
Masashi Yamashita Japan	15	372 1.3×	246 1.0×	38 0.2×	79 0.6×	126 1.1×	84	754
Raffaele Molino-Lova Italy	15	124 0.4×	96 0.4×	73 0.3×	47 0.3×	84 0.8×	36	553
Toshiki Kutsuna Japan	12	106 0.4×	110 0.5×	241 1.1×	29 0.2×	123 1.1×	30	440
Nobuaki Hamazaki Japan	18	627 2.2×	512 2.2×	47 0.2×	284 2.1×	195 1.7×	87	1.2k
Matthew J. Clarkson Australia	9	109 0.4×	160 0.7×	135 0.6×	205 1.5×	121 1.1×	21	436
Luiz Alberto Forgiarini Brazil	19	177 0.6×	86 0.4×	75 0.4×	39 0.3×	168 1.5×	90	1.1k
Brad Lloyd Australia	7	271 1.0×	70 0.3×	390 1.8×	38 0.3×	314 2.8×	8	705

Countries citing papers authored by Koji Hiraki

Since Specialization

Citations

This map shows the geographic impact of Koji Hiraki's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Koji Hiraki with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Koji Hiraki more than expected).

Fields of papers citing papers by Koji Hiraki

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Koji Hiraki. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Koji Hiraki. The network helps show where Koji Hiraki may publish in the future.

Co-authorship network of co-authors of Koji Hiraki

This figure shows the co-authorship network connecting the top 25 collaborators of Koji Hiraki. A scholar is included among the top collaborators of Koji Hiraki based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Koji Hiraki. Koji Hiraki is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Otobe, Yuhei, Minoru Yamada, Koji Hiraki, et al.. (2021). Physical Exercise Improves Cognitive Function in Older Adults with Stage 3–4 Chronic Kidney Disease: A Randomized Controlled Trial. American Journal of Nephrology. 52(12). 929–939. 19 indexed citations

Hiraki, Koji, et al.. (2020). Physical activity in patients with pre-dialysis chronic kidney disease is related to physical function. Clinical and Experimental Nephrology. 24(12). 1189–1190. 1 indexed citations

Saitō, Akira, Koji Hiraki, Yuhei Otobe, et al.. (2020). Relationship between Serum Vitamin D and Leg Strength in Older Adults with Pre-Dialysis Chronic Kidney Disease: A Preliminary Study. International Journal of Environmental Research and Public Health. 17(4). 1433–1433. 4 indexed citations

Otobe, Yuhei, et al.. (2019). The impact of the combination of kidney and physical function on cognitive decline over 2 years in older adults with pre-dialysis chronic kidney disease. Clinical and Experimental Nephrology. 23(6). 756–762. 2 indexed citations

Otobe, Yuhei, Koji Hiraki, Kazuhiro P. Izawa, et al.. (2017). Mild cognitive impairment in older adults with pre‐dialysis patients with chronic kidney disease: Prevalence and association with physical function. Nephrology. 24(1). 50–55. 35 indexed citations

Hiraki, Koji, Yugo Shibagaki, Kazuhiro P. Izawa, et al.. (2017). Effects of home-based exercise on pre-dialysis chronic kidney disease patients: a randomized pilot and feasibility trial. BMC Nephrology. 18(1). 198–198. 62 indexed citations

Izawa, Kazuhiro P., Satoshi Watanabe, Koichiro Oka, et al.. (2013). Usefulness of Step Counts to Predict Mortality in Japanese Patients With Heart Failure. The American Journal of Cardiology. 111(12). 1767–1771. 37 indexed citations

Hiraki, Koji, Satoshi Watanabe, Kazuhiro P. Izawa, et al.. (2013). Knee extensor muscle strength and index of renal function associated with an exercise capacity of 5 metabolic equivalents in male chronic heart failure patients with chronic kidney disease. Clinical and Experimental Nephrology. 18(2). 313–319. 2 indexed citations

Hiraki, Koji, Atsuko Kamijo‐Ikemori, Takashi Yasuda, et al.. (2013). Moderate-Intensity Single Exercise Session Does Not Induce Renal Damage. Journal of Clinical Laboratory Analysis. 27(3). 177–180. 16 indexed citations

10.

Hiraki, Koji, Takashi Yasuda, Kazuhiro P. Izawa, et al.. (2012). Decreased physical function in pre-dialysis patients with chronic kidney disease. Clinical and Experimental Nephrology. 17(2). 225–231. 94 indexed citations

11.

Izawa, Kazuhiro P., Satoshi Watanabe, Koji Hiraki, et al.. (2012). Determination of the Effectiveness of Accelerometer Use in the Promotion of Physical Activity in Cardiac Patients: A Randomized Controlled Trial. Archives of Physical Medicine and Rehabilitation. 93(11). 1896–1902. 38 indexed citations

12.

Hiraki, Koji, Naohiko Imai, Tsutomu Sakurada, et al.. (2012). Physical activity is associated with serum albumin in peritoneal dialysis patients.. PubMed. 28. 148–52. 13 indexed citations

13.

Izawa, Kazuhiro P., Satoshi Watanabe, Koichiro Oka, et al.. (2012). Upper and Lower Extremity Muscle Strength Levels Associated With an Exercise Capacity of 5 Metabolic Equivalents in Male Patients With Heart Failure. Journal of Cardiopulmonary Rehabilitation and Prevention. 32(2). 85–91. 19 indexed citations

14.

Izawa, Kazuhiro P., Satoshi Watanabe, Koichiro Oka, et al.. (2011). Relation Between Sleep Quality and Physical Activity in Chronic Heart Failure Patients. Recent Advances in Cardiovascular Drug Discovery (Formerly Recent Patents on Cardiovascular Drug Discovery). 6(3). 161–167. 6 indexed citations

15.

Izawa, Kazuhiro P., Satoshi Watanabe, Koichiro Oka, et al.. (2011). Cardiac Rehabilitation Outcome Following Percutaneous Coronary Intervention Compared to Cardiac Surgery. Recent Advances in Cardiovascular Drug Discovery (Formerly Recent Patents on Cardiovascular Drug Discovery). 6(2). 133–139. 6 indexed citations

16.

Izawa, Kazuhiro P., Satoshi Watanabe, Koichiro Oka, et al.. (2009). Age-Related Differences in Physiologic and Psychosocial Outcomes After Cardiac Rehabilitation. American Journal of Physical Medicine & Rehabilitation. 89(1). 24–33. 19 indexed citations

17.

Izawa, Kazuhiro P., Satoshi Watanabe, Naohiko Osada, et al.. (2009). Handgrip strength as a predictor of prognosis in Japanese patients with congestive heart failure. European Journal of Cardiovascular Prevention & Rehabilitation. 16(1). 21–27. 88 indexed citations

18.

Izawa, Kazuhiro P., Koichiro Oka, Satoshi Watanabe, et al.. (2008). Gender-related differences in clinical characteristics and physiological and psychosocial outcomes of japanese patients at entry into phase II cardiac rehabilitation. Acta Dermato Venereologica. 40(3). 225–230. 26 indexed citations

19.

Yokoyama, Hitoshi, et al.. (2007). Usefulness of Pulmonary Compliance Determination in Patients Undergoing Artificial Respiration: Relationship of Pulmonary Compliance to Tidal Volume and Weaning from Mechanical Ventilation. Rigakuryoho Kagaku. 22(3). 373–378. 2 indexed citations

20.

Izawa, Kazuhiro P., Satoshi Watanabe, Hitoshi Yokoyama, et al.. (2007). Muscle Strength in Relation to Disease Severity in Patients with Congestive Heart Failure. American Journal of Physical Medicine & Rehabilitation. 86(11). 893–900. 33 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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