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Hitoshi Okamura

Hitoshi Okamura

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 95 10057 9437 281 266 568 33938

Hitoshi Okamura publications per year

The chart shows the history of publications by Hitoshi Okamura between 1973 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Hitoshi Okamura published across 53 years, from 1973 to 2025, averaging 11.4 papers a year. Output peaked at 30 publications in 1994. 11 of the 602 publications appeared in the last two years.

No. of publications
10 20 30
Bar chart. Horizontal axis: year, 1973 to 2025. Vertical axis: number of publications, 0 to 30. Peak 30 publications in 1994. 1973: 1 publication 1974: 3 publications 1975: 1 publication 1976: 1 publication 1977: 4 publications 1978: 1 publication 1979: 1 publication 1980: 10 publications 1981: 12 publications 1982: 14 publications 1983: 17 publications 1984: 16 publications 1985: 21 publications 1986: 15 publications 1987: 13 publications 1988: 16 publications 1989: 18 publications 1990: 22 publications 1991: 20 publications 1992: 20 publications 1993: 20 publications 1994: 30 publications 1995: 18 publications 1996: 18 publications 1997: 27 publications 1998: 16 publications 1999: 12 publications 2000: 17 publications 2001: 15 publications 2002: 13 publications 2003: 20 publications 2004: 10 publications 2005: 16 publications 2006: 12 publications 2007: 9 publications 2008: 7 publications 2009: 11 publications 2010: 7 publications 2011: 7 publications 2012: 8 publications 2013: 5 publications 2014: 9 publications 2015: 7 publications 2016: 7 publications 2017: 9 publications 2018: 11 publications 2019: 4 publications 2020: 5 publications 2021: 2 publications 2022: 8 publications 2023: 5 publications 2024: 6 publications 2025: 5 publications
1973 2025

602 publications in total across all disciplines

View publications per year as a table
Hitoshi Okamura: publications per year, 1973 to 2025
Year Publications
1973 1
1974 3
1975 1
1976 1
1977 4
1978 1
1979 1
1980 10
1981 12
1982 14
1983 17
1984 16
1985 21
1986 15
1987 13
1988 16
1989 18
1990 22
1991 20
1992 20
1993 20
1994 30
1995 18
1996 18
1997 27
1998 16
1999 12
2000 17
2001 15
2002 13
2003 20
2004 10
2005 16
2006 12
2007 9
2008 7
2009 11
2010 7
2011 7
2012 8
2013 5
2014 9
2015 7
2016 7
2017 9
2018 11
2019 4
2020 5
2021 2
2022 8
2023 5
2024 6
2025 5
Total 602
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Hitoshi Okamura publication distribution in Medicine in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Medicine in 2026. The highlighted bar marks where Hitoshi Okamura sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 86 bars. Horizontal axis: publications, 101–120 to 1,796+. Vertical axis: number of scientists, 0 to 922. Most scientists, 922, have 341–360 publications. The last bar groups every scientist with 1,796 publications or more. The highlighted bar, 561–580 publications, is where this scientist sits. 101–120 publications: 5 scientists 121–140 publications: 26 scientists 141–160 publications: 73 scientists 161–180 publications: 155 scientists 181–200 publications: 230 scientists 201–220 publications: 363 scientists 221–240 publications: 487 scientists 241–260 publications: 545 scientists 261–280 publications: 722 scientists 281–300 publications: 768 scientists 301–320 publications: 834 scientists 321–340 publications: 895 scientists 341–360 publications: 922 scientists 361–380 publications: 838 scientists 381–400 publications: 861 scientists 401–420 publications: 918 scientists 421–440 publications: 806 scientists 441–460 publications: 771 scientists 461–480 publications: 751 scientists 481–500 publications: 713 scientists 501–520 publications: 617 scientists 521–540 publications: 610 scientists 541–560 publications: 537 scientists 561–580 publications: 504 scientists 581–600 publications: 509 scientists 601–620 publications: 396 scientists 621–640 publications: 386 scientists 641–660 publications: 371 scientists 661–680 publications: 340 scientists 681–700 publications: 336 scientists 701–720 publications: 307 scientists 721–740 publications: 259 scientists 741–760 publications: 230 scientists 761–780 publications: 228 scientists 781–800 publications: 217 scientists 801–820 publications: 204 scientists 821–840 publications: 186 scientists 841–860 publications: 177 scientists 861–880 publications: 155 scientists 881–900 publications: 139 scientists 901–920 publications: 145 scientists 921–940 publications: 116 scientists 941–960 publications: 133 scientists 961–980 publications: 91 scientists 981–1,000 publications: 96 scientists 1,001–1,020 publications: 77 scientists 1,021–1,040 publications: 70 scientists 1,041–1,060 publications: 63 scientists 1,061–1,080 publications: 77 scientists 1,081–1,100 publications: 49 scientists 1,101–1,120 publications: 54 scientists 1,121–1,140 publications: 49 scientists 1,141–1,160 publications: 51 scientists 1,161–1,180 publications: 35 scientists 1,181–1,200 publications: 39 scientists 1,201–1,220 publications: 26 scientists 1,221–1,240 publications: 37 scientists 1,241–1,260 publications: 36 scientists 1,261–1,280 publications: 27 scientists 1,281–1,300 publications: 32 scientists 1,301–1,320 publications: 28 scientists 1,321–1,340 publications: 17 scientists 1,341–1,360 publications: 30 scientists 1,361–1,380 publications: 28 scientists 1,381–1,400 publications: 17 scientists 1,401–1,420 publications: 21 scientists 1,421–1,440 publications: 15 scientists 1,441–1,460 publications: 12 scientists 1,461–1,480 publications: 12 scientists 1,481–1,500 publications: 18 scientists 1,501–1,520 publications: 14 scientists 1,521–1,540 publications: 17 scientists 1,541–1,560 publications: 15 scientists 1,561–1,580 publications: 6 scientists 1,581–1,600 publications: 2 scientists 1,601–1,620 publications: 12 scientists 1,621–1,640 publications: 11 scientists 1,641–1,660 publications: 8 scientists 1,661–1,680 publications: 5 scientists 1,681–1,700 publications: 5 scientists 1,701–1,720 publications: 10 scientists 1,721–1,740 publications: 12 scientists 1,741–1,760 publications: 14 scientists 1,761–1,780 publications: 6 scientists 1,781–1,795 publications: 5 scientists 1,796+ publications: 100 scientists
101–120 publications 1,796+

This scientist: 568 publications — 68th percentile

68% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,796 publications or more.

View publications distribution as a table
Number of Medicine scientists by publication count, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
Publications Scientists This scientist
101–120 5
121–140 26
141–160 73
161–180 155
181–200 230
201–220 363
221–240 487
241–260 545
261–280 722
281–300 768
301–320 834
321–340 895
341–360 922
361–380 838
381–400 861
401–420 918
421–440 806
441–460 771
461–480 751
481–500 713
501–520 617
521–540 610
541–560 537
561–580 504 568
581–600 509
601–620 396
621–640 386
641–660 371
661–680 340
681–700 336
701–720 307
721–740 259
741–760 230
761–780 228
781–800 217
801–820 204
821–840 186
841–860 177
861–880 155
881–900 139
901–920 145
921–940 116
941–960 133
961–980 91
981–1,000 96
1,001–1,020 77
1,021–1,040 70
1,041–1,060 63
1,061–1,080 77
1,081–1,100 49
1,101–1,120 54
1,121–1,140 49
1,141–1,160 51
1,161–1,180 35
1,181–1,200 39
1,201–1,220 26
1,221–1,240 37
1,241–1,260 36
1,261–1,280 27
1,281–1,300 32
1,301–1,320 28
1,321–1,340 17
1,341–1,360 30
1,361–1,380 28
1,381–1,400 17
1,401–1,420 21
1,421–1,440 15
1,441–1,460 12
1,461–1,480 12
1,481–1,500 18
1,501–1,520 14
1,521–1,540 17
1,541–1,560 15
1,561–1,580 6
1,581–1,600 2
1,601–1,620 12
1,621–1,640 11
1,641–1,660 8
1,661–1,680 5
1,681–1,700 5
1,701–1,720 10
1,721–1,740 12
1,741–1,760 14
1,761–1,780 6
1,781–1,795 5
1,796+ 100
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Hitoshi Okamura D-index placement in Medicine in 2026

The chart shows the D-index (discipline H-index) distribution of Medicine scientists ranked by Research.com in 2026. The highlighted bar marks where Hitoshi Okamura sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 75 bars. Horizontal axis: D-Index, 70–71 to 217+. Vertical axis: number of scientists, 0 to 1,027. Most scientists, 1,027, have 82–83 D-Index. The last bar groups every scientist with 217 D-Index or more. The highlighted bar, 94–95 D-Index, is where this scientist sits. 70–71 D-Index: 226 scientists 72–73 D-Index: 391 scientists 74–75 D-Index: 574 scientists 76–77 D-Index: 730 scientists 78–79 D-Index: 891 scientists 80–81 D-Index: 972 scientists 82–83 D-Index: 1,027 scientists 84–85 D-Index: 1,003 scientists 86–87 D-Index: 960 scientists 88–89 D-Index: 970 scientists 90–91 D-Index: 922 scientists 92–93 D-Index: 839 scientists 94–95 D-Index: 808 scientists 96–97 D-Index: 779 scientists 98–99 D-Index: 668 scientists 100–101 D-Index: 611 scientists 102–103 D-Index: 630 scientists 104–105 D-Index: 513 scientists 106–107 D-Index: 541 scientists 108–109 D-Index: 445 scientists 110–111 D-Index: 429 scientists 112–113 D-Index: 399 scientists 114–115 D-Index: 393 scientists 116–117 D-Index: 318 scientists 118–119 D-Index: 302 scientists 120–121 D-Index: 287 scientists 122–123 D-Index: 255 scientists 124–125 D-Index: 256 scientists 126–127 D-Index: 252 scientists 128–129 D-Index: 230 scientists 130–131 D-Index: 179 scientists 132–133 D-Index: 168 scientists 134–135 D-Index: 163 scientists 136–137 D-Index: 159 scientists 138–139 D-Index: 134 scientists 140–141 D-Index: 134 scientists 142–143 D-Index: 118 scientists 144–145 D-Index: 109 scientists 146–147 D-Index: 106 scientists 148–149 D-Index: 74 scientists 150–151 D-Index: 79 scientists 152–153 D-Index: 80 scientists 154–155 D-Index: 87 scientists 156–157 D-Index: 57 scientists 158–159 D-Index: 74 scientists 160–161 D-Index: 69 scientists 162–163 D-Index: 60 scientists 164–165 D-Index: 53 scientists 166–167 D-Index: 39 scientists 168–169 D-Index: 42 scientists 170–171 D-Index: 32 scientists 172–173 D-Index: 39 scientists 174–175 D-Index: 40 scientists 176–177 D-Index: 28 scientists 178–179 D-Index: 19 scientists 180–181 D-Index: 23 scientists 182–183 D-Index: 31 scientists 184–185 D-Index: 18 scientists 186–187 D-Index: 20 scientists 188–189 D-Index: 22 scientists 190–191 D-Index: 13 scientists 192–193 D-Index: 21 scientists 194–195 D-Index: 12 scientists 196–197 D-Index: 12 scientists 198–199 D-Index: 14 scientists 200–201 D-Index: 15 scientists 202–203 D-Index: 13 scientists 204–205 D-Index: 10 scientists 206–207 D-Index: 8 scientists 208–209 D-Index: 4 scientists 210–211 D-Index: 12 scientists 212–213 D-Index: 11 scientists 214–215 D-Index: 10 scientists 216 D-Index: 4 scientists 217+ D-Index: 98 scientists
70–71 D-Index 217+

This scientist: 95 D-Index — 51st percentile

51% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 217 D-Index or more.

View D-Index distribution as a table
Number of Medicine scientists by D-index, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
D-Index Scientists This scientist
70–71 226
72–73 391
74–75 574
76–77 730
78–79 891
80–81 972
82–83 1,027
84–85 1,003
86–87 960
88–89 970
90–91 922
92–93 839
94–95 808 95
96–97 779
98–99 668
100–101 611
102–103 630
104–105 513
106–107 541
108–109 445
110–111 429
112–113 399
114–115 393
116–117 318
118–119 302
120–121 287
122–123 255
124–125 256
126–127 252
128–129 230
130–131 179
132–133 168
134–135 163
136–137 159
138–139 134
140–141 134
142–143 118
144–145 109
146–147 106
148–149 74
150–151 79
152–153 80
154–155 87
156–157 57
158–159 74
160–161 69
162–163 60
164–165 53
166–167 39
168–169 42
170–171 32
172–173 39
174–175 40
176–177 28
178–179 19
180–181 23
182–183 31
184–185 18
186–187 20
188–189 22
190–191 13
192–193 21
194–195 12
196–197 12
198–199 14
200–201 15
202–203 13
204–205 10
206–207 8
208–209 4
210–211 12
212–213 11
214–215 10
216 4
217+ 98
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Overview

Hitoshi Okamura is affiliated with Kyoto University in Japan and has contributed extensively to the fields of medicine and psychology, with a particular focus on psychiatry, mental health, and clinical psychology. Their academic output spans 39 publications in medicine and 15 in psychology, underlining expertise across both domains.

Their research addresses a variety of subfields including psychiatry and mental health, clinical psychology, general health professions, oncology, and physical therapy, sports therapy and rehabilitation. Prominent topics in their work include grief, bereavement, and mental health; balance, gait, and falls prevention; dementia and cognitive impairment research; maternal and perinatal health interventions; stroke rehabilitation and recovery; childhood cancer survivors' quality of life; and palliative care and end-of-life issues.

Recent papers authored by Okamura cover a range of clinical and psychological topics, such as:

  • "The influence of coping types on post-traumatic growth in patients with primary breast cancer" (2020, Japanese Journal of Clinical Oncology)
  • "Factors associated with facilitating advance care planning based on the theory of planned behaviour" (2021, Japanese Journal of Clinical Oncology)
  • "The Japanese Breast Cancer Society clinical practice guidelines for epidemiology and prevention of breast cancer, 2022 edition" (2023, Breast Cancer)
  • "Effects of Cognitive Dysfunction and Dual Task on Gait Speed and Prefrontal Cortex Activation in Community-Dwelling Older Adults" (2020, Aging Neuropsychology and Cognition)
  • "Changes in motor function and quality of life after surgery in patients with pancreatic cancer" (2020, European Journal of Cancer Care)

Okamura frequently publishes in journals such as Dementia and Geriatric Cognitive Disorders, Japanese Journal of Clinical Oncology, Nursing and Health Sciences, Cureus, and PsycTESTS Dataset. These venues reflect the interdisciplinary nature of their work, bridging clinical oncology, neurological disorders, and psychological health.

Collaboration is a significant aspect of Okamura's research career. Frequent co-authors include Fumiko Kaneko, Kazuya Saita, Yoko Ueno, Tomoyuki Okazaki, and Keita Nakagawa, indicating a network of colleagues with whom Okamura consistently contributes to scholarly work.

Best Publications

  • Control mechanism of the circadian clock for timing of cell division in vivo.

    Takuya Matsuo;Shun Yamaguchi;Shun Yamaguchi;Shigeru Mitsui;Shigeru Mitsui;Aki Emi;Aki Emi

  • Synchronization of cellular clocks in the suprachiasmatic nucleus.

    Shun Yamaguchi;Hiromi Isejima;Hiromi Isejima;Takuya Matsuo;Takuya Matsuo;Ryusuke Okura

  • Circadian oscillation of a mammalian homologue of the Drosophila period gene.

    Hajime Tei;Hitoshi Okamura;Yasufumi Shigeyoshi;Chiaki Fukuhara

  • Light-induced resetting of a mammalian circadian clock is associated with rapid induction of the mPer1 transcript.

    Yasufumi Shigeyoshi;Kouji Taguchi;Shuzo Yamamoto;Seiichi Takekida

  • RNA-Methylation-Dependent RNA Processing Controls the Speed of the Circadian Clock

    Jean-Michel Fustin;Masao Doi;Yoshiaki Yamaguchi;Hayashi Hida

  • Thyroplasty as a new phonosurgical technique.

    N. Isshiki;H. Morita;H. Okamura;M. Hiramoto

  • Light activates the adrenal gland: Timing of gene expression and glucocorticoid release

    Atsushi Ishida;Tatsushi Mutoh;Tomoko Ueyama;Hideki Bando;Hideki Bando

  • microRNA Modulation of Circadian-Clock Period and Entrainment

    Hai Ying M. Cheng;Joseph W. Papp;Olga Varlamova;Heather Dziema

  • Molecular mechanisms of the biological clock in cultured fibroblasts.

    Kazuhiro Yagita;Filippo Tamanini;Gijsbertus T. J. van der Horst;Hitoshi Okamura

  • Photic induction of mPer1 and mPer2 in cry-deficient mice lacking a biological clock.

    Hitoshi Okamura;Shigeru Miyake;Yasuo Sumi;Shun Yamaguchi

  • Synchronization and Maintenance of Timekeeping in Suprachiasmatic Circadian Clock Cells by Neuropeptidergic Signaling

    Elizabeth S. Maywood;Akhilesh B. Reddy;Gabriel K.Y. Wong;John S. O'Neill

  • Antagonistic role of E4BP4 and PAR proteins in the circadian oscillatory mechanism

    Shigeru Mitsui;Shun Yamaguchi;Takuya Matsuo;Yoshiki Ishida

  • Salt-sensitive hypertension in circadian clock-deficient Cry-null mice involves dysregulated adrenal Hsd3b6.

    Masao Doi;Yukari Takahashi;Rie Komatsu;Fumiyoshi Yamazaki

  • FSP27 contributes to efficient energy storage in murine white adipocytes by promoting the formation of unilocular lipid droplets

    Naonobu Nishino;Yoshikazu Tamori;Sanshiro Tateya;Takayuki Kawaguchi

  • Thyroplasty type I (lateral compression) for dysphonia due to vocal cord paralysis or atrophy.

    N Isshiki;H Okamura;T Ishikawa

  • Adrenergic regulation of clock gene expression in mouse liver

    Hideyuki Terazono;Tatsushi Mutoh;Shun Yamaguchi;Masaki Kobayashi

  • Real-time imaging of the somite segmentation clock : revelation of unstable oscillators in the individual presomitic mesoderm cells

    Yoshito Masamizu;Toshiyuki Ohtsuka;Yoshiki Takashima;Hiroki Nagahara

  • Nucleocytoplasmic shuttling and mCRY‐dependent inhibition of ubiquitylation of the mPER2 clock protein

    Kazuhiro Yagita;Filippo Tamanini;Maya Yasuda;Jan H. J. Hoeijmakers

  • Mice Genetically Deficient in Vasopressin V1a and V1b Receptors Are Resistant to Jet Lag

    Yoshiaki Yamaguchi;Toru Suzuki;Yasutaka Mizoro;Hiroshi Kori

  • Role of hepatic STAT3 in brain-insulin action on hepatic glucose production.

    Hiroshi Inoue;Wataru Ogawa;Akihiro Asakawa;Yasuo Okamoto

Frequent Co-Authors

Noboru Yanaihara
Noboru Yanaihara University of Shizuoka
Yasufumi Shigeyoshi
Yasufumi Shigeyoshi Kindai University
Ikuko Nagatsu
Ikuko Nagatsu Fujita Health University
Shingo Fujii
Shingo Fujii Kyoto University
Shigenobu Shibata
Shigenobu Shibata Waseda University
Yasuyuki Yamashita
Yasuyuki Yamashita Kumamoto University
Ikuo Konishi
Ikuo Konishi Kyoto University
Kunio Kitahama
Kunio Kitahama Tokyo Metropolitan Institute of Medical Science
Mutsumasa Takahashi
Mutsumasa Takahashi Kumamoto University
Takahiro Moriya
Takahiro Moriya Tohoku University

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