Per Kristian Opstad

1.3k total citations
37 papers, 1.1k citations indexed

About

Per Kristian Opstad is a scholar working on Physiology, Cellular and Molecular Neuroscience and Cell Biology. According to data from OpenAlex, Per Kristian Opstad has authored 37 papers receiving a total of 1.1k indexed citations (citations by other indexed papers that have themselves been cited), including 14 papers in Physiology, 11 papers in Cellular and Molecular Neuroscience and 10 papers in Cell Biology. Recurrent topics in Per Kristian Opstad's work include Muscle metabolism and nutrition (10 papers), Neuropeptides and Animal Physiology (10 papers) and Exercise and Physiological Responses (8 papers). Per Kristian Opstad is often cited by papers focused on Muscle metabolism and nutrition (10 papers), Neuropeptides and Animal Physiology (10 papers) and Exercise and Physiological Responses (8 papers). Per Kristian Opstad collaborates with scholars based in Norway, United States and Germany. Per Kristian Opstad's co-authors include Torbjørn Breivik, Yngvar Gundersen, Arne Bøyum, Pål Wiik, Per Gjermo, Torleiv O. Rognum, Frode Fonnum, Karl E. Friedl, Per Vaagenes and James P. DeLany and has published in prestigious journals such as American Journal of Clinical Nutrition, Medicine & Science in Sports & Exercise and Critical Care Medicine.

In The Last Decade

Per Kristian Opstad

37 papers receiving 1.0k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Per Kristian Opstad Norway 21 277 221 183 170 145 37 1.1k
P. K. Opstad Norway 19 346 1.2× 130 0.6× 241 1.3× 171 1.0× 58 0.4× 53 1.2k
Yngvar Gundersen Norway 18 410 1.5× 43 0.2× 206 1.1× 332 2.0× 104 0.7× 51 1.2k
Charles Yannick Guézennec France 15 472 1.7× 49 0.2× 225 1.2× 111 0.7× 75 0.5× 19 1.1k
Karen Barros Parron Fernandes Brazil 22 204 0.7× 90 0.4× 55 0.3× 115 0.7× 18 0.1× 81 1.2k
Juan José García Spain 21 361 1.3× 46 0.2× 106 0.6× 178 1.0× 75 0.5× 57 1.3k
Simon N. Thornton France 25 467 1.7× 160 0.7× 68 0.4× 271 1.6× 9 0.1× 103 1.7k
David R. Hooper United States 21 232 0.8× 43 0.2× 249 1.4× 169 1.0× 42 0.3× 53 1.3k
Albert Moraska United States 19 327 1.2× 69 0.3× 302 1.7× 176 1.0× 29 0.2× 28 1.4k
Ann Bengtsson Sweden 18 274 1.0× 50 0.2× 355 1.9× 76 0.4× 147 1.0× 28 1.6k
Elizabeth R. Baker United States 17 155 0.6× 69 0.3× 76 0.4× 273 1.6× 22 0.2× 20 1.1k

Countries citing papers authored by Per Kristian Opstad

Since Specialization
Citations

This map shows the geographic impact of Per Kristian Opstad'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 Per Kristian Opstad with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Per Kristian Opstad more than expected).

Fields of papers citing papers by Per Kristian Opstad

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Per Kristian Opstad. 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 Per Kristian Opstad. The network helps show where Per Kristian Opstad may publish in the future.

Co-authorship network of co-authors of Per Kristian Opstad

This figure shows the co-authorship network connecting the top 25 collaborators of Per Kristian Opstad. A scholar is included among the top collaborators of Per Kristian Opstad 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 Per Kristian Opstad. Per Kristian Opstad is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Breivik, Torbjørn, Per Gjermo, Yngvar Gundersen, et al.. (2024). Microbiota‐immune‐brain interactions: A new vision in the understanding of periodontal health and disease. Periodontology 2000. 96(1). 20–41. 5 indexed citations
2.
Friedl, Karl E., Torbjørn Breivik, Rob Carter, et al.. (2016). Soldier Health Habits and the Metabolically Optimized Brain. Military Medicine. 181(11). e1499–e1507. 6 indexed citations
3.
Opstad, Per Kristian, et al.. (2007). LeuCAM and Reactive Oxygen Species during Long-Term Exercise Combined with Sleep and Energy Deficiency. Medicine & Science in Sports & Exercise. 39(2). 275–282. 6 indexed citations
4.
Gundersen, Yngvar, et al.. (2006). Seven days’ around the clock exhaustive physical exertion combined with energy depletion and sleep deprivation primes circulating leukocytes. European Journal of Applied Physiology. 97(2). 151–157. 28 indexed citations
5.
Hoyt, Reed W., et al.. (2006). Negative energy balance in male and female rangers: effects of 7 d of sustained exercise and food deprivation. American Journal of Clinical Nutrition. 83(5). 1068–1075. 80 indexed citations
6.
Breivik, Torbjørn, Yngvar Gundersen, Per Kristian Opstad, & Frode Fonnum. (2005). Chemical sympathectomy inhibits periodontal disease in Fischer 344 rats. Journal of Periodontal Research. 40(4). 325–330. 27 indexed citations
7.
Breivik, Torbjørn, Per Kristian Opstad, Rolf Einar Engstad, et al.. (2005). Soluble β‐1,3/1,6‐glucan from yeast inhibits experimental periodontal disease in Wistar rats. Journal Of Clinical Periodontology. 32(4). 347–352. 34 indexed citations
8.
Breivik, Torbjørn, Yngvar Gundersen, Harald Osmundsen, Frode Fonnum, & Per Kristian Opstad. (2005). Neonatal dexamethasone and chronic tianeptine treatment inhibit ligature‐induced periodontitis in adult rats. Journal of Periodontal Research. 41(1). 23–32. 32 indexed citations
9.
10.
Breivik, Torbjørn, Yngvar Gundersen, Frode Fonnum, Per Vaagenes, & Per Kristian Opstad. (2004). Chronic glycine treatment inhibits ligature‐induced periodontal disease in Wistar rats. Journal of Periodontal Research. 40(1). 43–47. 11 indexed citations
11.
Breivik, Torbjørn, Yngvar Gundersen, Harald Osmundsen, Per Kristian Opstad, & Frode Fonnum. (2004). Chronic treatment with the glutamate receptor antagonist MK‐801 alters periodontal disease susceptibility. Journal of Periodontal Research. 40(1). 28–35. 12 indexed citations
12.
Frykman, Peter, Everett A. Harman, Per Kristian Opstad, et al.. (2003). Effects of a 3-Month Endurance Event on Physical Performance and Body Composition: The G2 Trans-Greenland Expedition☆. Wilderness and Environmental Medicine. 14(4). 240–248. 36 indexed citations
13.
Vaagenes, Per, Yngvar Gundersen, & Per Kristian Opstad. (2003). Rapid rewarming after mild hypothermia accentuates the inflammatory response after acute volume controlled haemorrhage in spontaneously breathing rats. Resuscitation. 58(1). 103–112. 32 indexed citations
14.
Omland, Torbjørn, Per Kristian Opstad, & Kenneth Dickstein. (1994). Plasma neuropeptide Y levels in the acute and early convalescent phase after myocardial infarction. American Heart Journal. 127(4). 774–779. 15 indexed citations
15.
Opstad, Per Kristian, et al.. (1994). Adrenaline stimulated cyclic adenosine monophosphate response in leucocytes is reduced after prolonged physical activity combined with sleep and energy deprivation. European Journal of Applied Physiology. 69(5). 371–375. 5 indexed citations
16.
Opstad, Per Kristian. (1992). The hypothalamo-pituitary regulation of androgen secretion in young men after prolonged physical stress combined with energy and sleep deprivation. European Journal of Endocrinology. 127(3). 231–236. 35 indexed citations
17.
Brandtzæg, P, Olav Øktedalen, Peter Kierulf, & Per Kristian Opstad. (1989). Elevated VIP and endotoxin plasma levels in human gram-negative septic shock. Regulatory Peptides. 24(1). 37–44. 52 indexed citations
18.
Wiik, Pål, Per Kristian Opstad, Stein Knardahl, & Arne Bøyum. (1988). Receptors for vasoactive intestinal peptide (VIP) on human mononuclear leucocytes are upregulated during prolonged strain and energy deficiency. Peptides. 9(1). 181–186. 9 indexed citations
19.
20.
Opstad, Per Kristian, et al.. (1982). Decreased serum levels of oestradiol, testosterone and prolactin during prolonged physical strain and sleep deprivation, and the influence of a high calory diet. European Journal of Applied Physiology. 49(3). 343–348. 43 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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